DC-DC Converters
Products (40)
ADP1031ACPZ-1 - Isolated PMU with 3 Regulators | Analog Devices
The ADP1031ACPZ-1 is a high performance, isolated micropower management unit (PMU) from Analog Devices that integrates an isolated flyback dc-to-dc regulator, an inverting dc-to-dc regulator, and a buck dc-to-dc regulator, providing three isolated power rails. It also includes four high speed serial peripheral interface (SPI) isolation channels, making it ideal for isolated data acquisition and industrial applications. The device is housed in a 41-lead LFCSP (9x7 mm) package and operates over a wide input voltage range. An isolated PMU is a power management IC that combines multiple power conversion stages with galvanic isolation, enabling safe and noise-free power transfer across an isolation barrier. It integrates the isolation components (such as transformers) and control circuitry into a single package, simplifying design and reducing board space. The ADP1031 belongs to the family of isolated power management units, which are essential in industrial automation, medical equipment, and communication systems where safety and noise immunity are critical. Key features of the ADP1031ACPZ-1 include a wide input voltage range, high efficiency, and integrated isolation. The flyback regulator provides a regulated output, while the inverting and buck regulators offer additional rails with different polarities and voltage levels. The device also features overvoltage protection (OVP) on the inverting regulator, which monitors the FB3 pin and stops switching if the voltage falls below VFB3 by 10%, ensuring safe operation. The integrated SPI isolation channels eliminate the need for external digital isolators, reducing component count and system cost. Technically, the ADP1031 uses a proprietary architecture that combines a primary-side controller with secondary-side regulation, achieving high efficiency and accurate output regulation. The device supports a wide range of output voltages and currents, making it versatile for various applications. The package is designed for excellent thermal performance, with an exposed pad for heat dissipation. Typical applications include isolated data acquisition systems, industrial process control, programmable logic controllers (PLCs), and isolated sensor interfaces. The device is particularly suited for applications requiring multiple isolated power rails and high-speed data isolation, such as motor drives and smart grid equipment. When designing with the ADP1031ACPZ-1, it is important to carefully select the external transformer and components to meet the required isolation and efficiency specifications. Proper PCB layout is essential to minimize noise and ensure reliable operation. The device also requires careful thermal management due to its power dissipation.
ADP1031ACPZ-2 - Isolated PMU with 7 Digital Isolators | Analog Devices
The ADP1031ACPZ-2 is a high performance, isolated micropower management unit (PMU) from Analog Devices that integrates an isolated flyback dc-to-dc regulator, an inverting dc-to-dc regulator, and a buck dc-to-dc regulator to provide three isolated power rails. Additionally, it contains four high-speed serial peripheral interface (SPI) digital isolator channels and three general-purpose digital isolator channels, totaling seven digital isolators. This device is designed for industrial applications requiring galvanic isolation and multiple isolated power domains. An isolated PMU is a power management IC that combines isolated DC-DC conversion with digital isolation in a single package, eliminating the need for separate isolated power supplies and digital isolators. It sits within the power management IC hierarchy, specifically under isolated power converters, and is essential for systems that require signal and power isolation for safety, noise immunity, or ground loop elimination. Key features of the ADP1031ACPZ-2 include a wide input voltage range, three isolated outputs (one flyback, one inverting, one buck), and seven digital isolator channels with data rates up to 100 kbps. The device operates over the industrial temperature range of -40°C to +125°C and is available in a 41-lead LFCSP (9x7 mm) package. The ADP1031ACPZ-2 variant specifically provides a 5.0V output on the buck regulator, as indicated by the '2' suffix. The ADP1031 uses a high-frequency flyback architecture with integrated power switches, achieving high efficiency and small form factor. The digital isolators use iCoupler technology, providing reliable isolation up to [DATA_NEEDED: isolation voltage] with low propagation delay. The device includes soft-start, overcurrent protection, and thermal shutdown for robust operation. Typical applications include industrial fieldbus systems, programmable logic controllers (PLCs), isolated sensor interfaces, and motor drive control circuits. The ADP1031ACPZ-2 is particularly suited for systems requiring isolated SPI communication and multiple isolated power rails, such as data acquisition systems and industrial automation. When designing with this device, ensure proper PCB layout for isolation barrier spacing and use recommended transformer and capacitor values from the datasheet. The input supply should be decoupled with low-ESR ceramic capacitors, and the isolated outputs should be filtered to meet ripple requirements.
ADP1031ACPZ-3-RL7 - Isolated PMU with 7 Digital Isolators | Analog Devices
The ADP1031ACPZ-3-RL7 is a high performance, isolated micropower management unit (PMU) from Analog Devices that integrates an isolated flyback dc-to-dc regulator, an inverting dc-to-dc regulator, and a buck dc-to-dc regulator to provide three isolated power rails. Additionally, it contains four high speed serial peripheral interface (SPI) digital isolators and three general-purpose digital isolators, making it a complete isolated power and data solution in a single 41-lead LFCSP (9x7 mm) package. This device is designed for applications requiring galvanic isolation and multiple regulated outputs, such as industrial process control, isolated data acquisition, and power supply monitoring. An isolated micropower management unit (PMU) is a power management IC that integrates multiple DC-DC converters and digital isolators to provide isolated power and signal transfer across an isolation barrier. It combines the functions of a flyback converter, an inverting converter, and a buck converter, along with digital isolators, into a single package. This integration reduces board space, simplifies design, and improves reliability compared to discrete solutions. The ADP1031 belongs to the family of isolated power management ICs, which are essential in systems requiring safety isolation, noise immunity, and multiple isolated supply rails. Key features of the ADP1031ACPZ-3-RL7 include a wide input voltage range, three isolated outputs (one positive, one negative, and one buck), and integrated digital isolators with up to 100 Mbps data rate. The device operates from a 4.5V to 60V input supply, making it suitable for industrial 24V buses and other high-voltage rails. The flyback regulator provides an isolated output up to 3.3V or 5V, the inverting regulator provides a negative output down to -5V, and the buck regulator provides a positive output down to 3.3V. The digital isolators provide reinforced isolation up to 5 kV rms, ensuring safe signal transfer across the isolation barrier. Technically, the ADP1031 uses a proprietary architecture that combines a primary-side flyback controller with secondary-side regulation, achieving high efficiency and low EMI. The device includes overvoltage protection (OVP) on the inverting regulator, which monitors the FB3 pin and stops switching if the voltage falls below VFB3 by 10%. This protects downstream circuitry from excessive negative voltages. The device also features soft-start, short-circuit protection, and thermal shutdown, ensuring robust operation in harsh environments. Typical applications include isolated data acquisition systems, industrial PLCs, motor control, and power monitoring. The ADP1031 is ideal for systems that require isolated power and data transfer, such as isolated SPI communication between a microcontroller and an ADC. Its integrated digital isolators eliminate the need for separate isolator ICs, reducing component count and board space. When designing with the ADP1031, ensure proper PCB layout with adequate spacing for isolation, and place decoupling capacitors close to the power pins. The device requires an external transformer for the flyback converter, and the selection of the transformer is critical for efficiency and isolation rating. Refer to the datasheet for recommended transformer specifications and layout guidelines.
L7980TR - 2A Step-Down Switching Regulator | STMicroelectronics
The STMicroelectronics L7980TR is a step-down switching regulator capable of delivering up to 2A output current. It operates from an input voltage range of 4.5V to 28V and provides an adjustable output voltage down to 0.6V. The device is available in an 8-pin SOIC package (SO-8) and is designed for high-efficiency power conversion in a wide range of applications. A step-down switching regulator, also known as a buck converter, is a type of DC-DC converter that efficiently reduces a higher input voltage to a lower output voltage. Unlike linear regulators, which dissipate excess power as heat, switching regulators use an inductor, a switch, and a diode to transfer energy in discrete pulses, achieving efficiencies often above 90%. This makes them essential in battery-powered and high-current applications where power loss must be minimized. The L7980TR belongs to the broader category of power management ICs, specifically within the DC-DC converter family. Key features of the L7980TR include a 250 kHz fixed switching frequency, an internal power MOSFET with a low RDS(on) of 250 mOhm, and a high-efficiency design that minimizes external component count. The device also includes an internal compensation network, soft-start, and thermal shutdown protection, simplifying the design process. The adjustable output voltage, set by an external resistor divider, allows flexibility for various output levels. The L7980TR utilizes a current-mode control architecture, providing fast transient response and stable operation over a wide range of load currents. The internal compensation eliminates the need for external compensation components, reducing board space and design complexity. The device's high switching frequency allows the use of small, low-cost inductors and capacitors, further reducing the overall solution footprint. Typical applications include point-of-load (POL) converters for FPGAs, DSPs, and microcontrollers, as well as distributed power systems, battery chargers, and industrial control systems. The wide input voltage range makes it suitable for 12V and 24V industrial buses, while the high efficiency extends battery life in portable devices. When designing with the L7980TR, ensure proper PCB layout with short, wide traces for high-current paths and adequate grounding. The exposed pad (if present) should be connected to the ground plane for thermal dissipation. Input and output capacitors should be placed close to the IC to minimize parasitic inductance and ensure stable operation.
L7981TR - 2A Step-Down Switching Regulator | STMicroelectronics
The STMicroelectronics L7981TR is a step-down switching regulator capable of delivering up to 2A output current from an input voltage range of 4.5V to 28V. Housed in a compact 8-pin SOIC (SO-8) package, this device integrates a high-side power MOSFET and provides a fixed 3.3V output voltage, making it suitable for a wide range of power conversion applications. A step-down switching regulator, also known as a buck converter, is a type of DC-DC converter that efficiently reduces a higher input voltage to a lower output voltage. Unlike linear regulators, which dissipate excess power as heat, switching regulators use an inductor and a switch to transfer energy in discrete pulses, achieving high efficiency, especially when the input-to-output voltage difference is large. The L7981TR belongs to the broader category of power management ICs, specifically within the DC-DC converter family, and is designed for applications requiring reliable and efficient voltage step-down. Key features of the L7981TR include a 2A output current capability, a wide input voltage range of 4.5V to 28V, and a fixed 3.3V output voltage. The device operates at a switching frequency of 250 kHz, which balances efficiency and component size. It also features internal current limiting, thermal shutdown, and an enable pin for power sequencing. The SO-8 package offers a compact footprint with a thermal resistance of approximately 62.5 C/W, allowing for moderate power dissipation without external heatsinking. The L7981TR utilizes a current-mode control architecture, which provides fast transient response and simplifies loop compensation. The integrated high-side MOSFET reduces external component count, while the internal compensation network minimizes design complexity. The device's high efficiency, typically above 85% for 12V to 3.3V conversion at 1A load, makes it suitable for battery-powered and industrial applications where power loss must be minimized. Typical applications include point-of-load (POL) converters for microcontrollers and FPGAs, industrial control systems, and distributed power architectures. The wide input range allows operation from 5V USB supplies, 12V industrial rails, and 24V bus systems, providing design flexibility across multiple platforms. When designing with the L7981TR, ensure proper input and output capacitor selection to maintain stability and minimize output ripple. The enable pin allows sequenced power-up in multi-rail systems, which is critical for processors requiring specific rail sequencing. Additionally, the thermal pad on the SO-8 package should be connected to a sufficient copper area for heat dissipation.
L7983TR - 38V 3A Step-Down Switching Regulator | STMicroelectronics
The STMicroelectronics L7983TR is a step-down switching regulator (buck converter) capable of delivering up to 3A output current from an input voltage range of 4.5V to 38V. Housed in a compact 8-pin SOIC (SO-8) package, this device integrates a high-side power MOSFET and provides a fixed 250kHz switching frequency, making it suitable for a wide range of power conversion applications. A buck converter, also known as a step-down regulator, is a type of DC-DC converter that efficiently reduces a higher input voltage to a lower output voltage. It operates by rapidly switching a transistor on and off, storing energy in an inductor during the on-time and releasing it to the load during the off-time. This switching action achieves high efficiency, typically above 85%, which is critical in battery-powered and thermally constrained systems. The L7983TR belongs to the family of switching regulators, which are a subset of power management ICs, and is designed to replace less efficient linear regulators in applications where power dissipation is a concern. Key features of the L7983TR include a 3A output current capability, a wide input voltage range of 4.5V to 38V, and a fixed 250kHz switching frequency. The device offers internal compensation, simplifying the design by reducing external component count. It also includes overcurrent protection, thermal shutdown, and an enable pin for power sequencing. The high switching frequency allows for the use of small inductors and capacitors, reducing the overall solution footprint. The L7983TR utilizes a current-mode control architecture, which provides fast transient response and stable operation over a wide range of load conditions. The integrated high-side MOSFET minimizes external component count and reduces conduction losses. The device is designed for high efficiency, with a typical efficiency of 90% at 12V input and 5V output at 2A load. The internal soft-start function limits inrush current during startup, preventing output overshoot. Typical applications include industrial power supplies, automotive systems, distributed power architectures, and point-of-load (POL) converters. The wide input voltage range makes it suitable for 12V and 24V bus systems, while the 3A output current can power FPGAs, microcontrollers, and sensors. The enable pin allows for power sequencing in multi-rail systems, ensuring proper startup order. When designing with the L7983TR, ensure proper PCB layout with short, wide traces for high-current paths and adequate ground plane for thermal management. The inductor and output capacitor should be placed close to the IC to minimize parasitic inductance. The feedback resistor divider should be placed away from the inductor to avoid noise coupling. The thermal pad (if present) should be soldered to a large copper area for heat dissipation.
L7985TR - 2A Step-Down Switching Regulator | STMicroelectronics
The STMicroelectronics L7985TR is a step-down switching regulator capable of delivering up to 2A output current. It operates from an input voltage range of 4.5V to 38V, making it suitable for a wide variety of industrial and automotive applications. The device is available in a compact HSOP-8 package, which is designed for surface-mount assembly and provides excellent thermal performance. A step-down switching regulator, also known as a buck converter, is a type of DC-DC converter that efficiently reduces a higher input voltage to a lower output voltage. Unlike linear regulators, which dissipate excess power as heat, switching regulators use an inductor and a switch to transfer energy in a controlled manner, achieving high efficiency. The L7985TR belongs to the family of voltage regulators, which are essential components in power management systems, converting unregulated power sources into stable, usable voltages for electronic circuits. Key features of the L7985TR include a 250 kHz fixed switching frequency, an internal power MOSFET, and a current-mode control architecture. The device offers a typical efficiency of over 85% at full load, reducing power loss and heat generation. It also includes a built-in soft-start function to limit inrush current during startup, and a thermal shutdown protection to prevent damage from overheating. The output voltage is adjustable from 0.6V to the input voltage, providing flexibility for various design requirements. The L7985TR utilizes a current-mode control scheme, which provides fast transient response and simplifies loop compensation. The internal power switch is rated for a peak current of 3A, ensuring reliable operation under load transients. The device also features a low quiescent current of 2.5 mA, which is beneficial for battery-powered applications. The HSOP-8 package has a thermal resistance of 40°C/W, allowing for efficient heat dissipation in moderate power applications. Typical applications for the L7985TR include point-of-load converters, distributed power systems, industrial control systems, and automotive power supplies. Its wide input voltage range and high efficiency make it ideal for converting 12V or 24V bus voltages to lower logic rails. The device is also suitable for LED lighting applications, where constant current regulation is required. When designing with the L7985TR, it is important to select the appropriate inductor and output capacitor values to ensure stable operation. The datasheet provides a detailed design procedure and recommended component values for various output voltages and currents. Additionally, proper PCB layout is critical to minimize parasitic inductance and ensure reliable performance.
L7986A - 3A 61V Step-Down Switching Regulator | STMicroelectronics
The STMicroelectronics L7986A is a step-down switching regulator with an input voltage range of 4.5V to 61V and a maximum output current of 3A. It is available in a HSOP-8 package with an exposed pad for enhanced thermal performance. The device integrates a 250mOhm high-side MOSFET, enabling high efficiency in a compact footprint. A step-down switching regulator, also known as a buck converter, is a type of DC-DC converter that steps down a higher input voltage to a lower output voltage with high efficiency. Unlike linear regulators, which dissipate excess power as heat, switching regulators use an inductor and a switch to transfer energy in discrete packets, achieving efficiencies often above 90%. The L7986A belongs to the family of power management ICs, specifically DC-DC converters, which are essential in systems requiring voltage conversion with minimal power loss. Key features of the L7986A include a 250kHz fixed switching frequency, an internal compensation network, and a power-good (PGOOD) open-drain output for monitoring output voltage status. The device also offers a soft-start function to limit inrush current during startup, and a thermal shutdown protection to prevent damage from overheating. The high input voltage capability of 61V makes it suitable for automotive and industrial applications where the supply rail can experience transients. The L7986A uses a current-mode control architecture, which provides fast transient response and simplifies loop compensation. The internal high-side MOSFET has a low on-resistance of 250mOhm, reducing conduction losses and improving efficiency at high load currents. The device operates at a fixed 250kHz switching frequency, balancing efficiency and external component size. The HSOP-8 package with exposed pad ensures efficient heat dissipation, allowing the regulator to deliver full 3A output current without additional heatsinking in many applications. Typical applications include automotive power supplies, industrial control systems, and distributed power architectures. In automotive systems, the wide input range accommodates 12V and 24V battery systems, while the high efficiency reduces thermal stress. In industrial settings, the regulator can step down 48V rails to lower voltages for logic and sensor circuits. The PGOOD output simplifies power sequencing in multi-rail systems. When designing with the L7986A, ensure proper PCB layout with short, wide traces for high-current paths and adequate copper area for the exposed pad to dissipate heat. The input and output capacitors should be placed close to the IC to minimize parasitic inductance. The soft-start capacitor value determines the startup time and inrush current, which should be selected based on the load requirements.
L7986TR - 3A 61V Step-Down Switching Regulator | STMicroelectronics
The STMicroelectronics L7986TR is a step-down switching regulator with an input voltage range of 4.5V to 61V and a maximum output current of 3A. It is available in a HSOP-8 package with exposed pad, designed for high-efficiency power conversion in industrial and automotive applications. Data verified as of 2026-08-05. A step-down (buck) switching regulator is a type of DC-DC converter that efficiently reduces a higher input voltage to a lower output voltage. Unlike linear regulators, which dissipate excess power as heat, switching regulators use an inductor and switch to transfer energy in pulses, achieving efficiencies often above 90%. This makes them essential in power management systems where thermal budget and battery life are critical, such as in industrial control, automotive electronics, and distributed power architectures. Key features of the L7986TR include a 250 kHz fixed switching frequency, an internal power MOSFET, and a high-voltage capability up to 61V. The device offers a low dropout operation and a wide output voltage range from 0.6V to VIN, making it versatile for various rail requirements. It also includes built-in protection features such as thermal shutdown, current limiting, and an enable pin for power sequencing. The L7986TR uses a current-mode control architecture, providing fast transient response and stable operation with a wide range of output capacitors. The internal compensation simplifies design, reducing external component count. The HSOP-8 package with exposed pad enhances thermal performance, allowing the device to deliver full 3A output current without excessive junction temperature rise when properly laid out. Typical applications include industrial 24V bus systems, automotive power supplies, and point-of-load converters. The wide input range and high efficiency make it suitable for pre-regulation in multi-rail systems, where it can step down a high-voltage bus to an intermediate rail for downstream linear regulators or low-voltage switching converters. When designing with the L7986TR, ensure proper input and output capacitor selection and adequate PCB copper area for thermal dissipation. The enable pin allows for controlled startup sequencing in multi-rail systems, which is critical for processor-based designs. This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the ST datasheet, providing a comprehensive resource for engineers evaluating the L7986TR.
L7987LTR - 3A 61V Step-Down Switching Regulator | STMicroelectronics
The STMicroelectronics L7987LTR is a step-down switching regulator (buck converter) capable of delivering up to 3A of continuous output current from a wide input voltage range of 4.5V to 61V. Housed in a compact HTSSOP-16 package with exposed pad, this device integrates a high-side power MOSFET and provides excellent efficiency for industrial, automotive, and general-purpose power conversion applications. A buck converter, also known as a step-down switching regulator, is a type of DC-DC converter that efficiently reduces a higher input voltage to a lower output voltage. Unlike linear regulators, which dissipate excess power as heat, buck converters use switching elements (transistors) and energy storage components (inductors and capacitors) to achieve high efficiency, often exceeding 90%. This makes them essential in power management systems where thermal constraints and battery life are critical. The L7987LTR belongs to the broader category of switching regulators, which are a subset of voltage regulators within power management ICs. Key features of the L7987LTR include a programmable switching frequency from 250 kHz to 1 MHz, allowing designers to optimize efficiency versus component size. It offers a low quiescent current of 1.3 mA in light-load conditions, making it suitable for battery-powered applications. The device also features an internal compensation network, simplifying the design process, and includes a power-good flag for system monitoring. Its wide input voltage range of up to 61V makes it ideal for automotive systems that must withstand load-dump transients. The L7987LTR utilizes a current-mode control architecture, providing fast transient response and stable operation over a wide range of output voltages. The integrated high-side MOSFET reduces external component count and PCB area. The device is available in a thermally enhanced HTSSOP-16 package, which offers a low thermal resistance of 40°C/W, enabling efficient heat dissipation in high-power applications. Typical applications include industrial power supplies, automotive infotainment systems, distributed power architectures, and battery chargers. Its ability to handle high input voltages and deliver 3A output makes it a versatile choice for point-of-load regulation in harsh environments. When designing with the L7987LTR, ensure proper PCB layout with short, low-inductance paths for the switching node and adequate copper area for thermal management. The exposed pad should be soldered to a large ground plane to maximize heat dissipation. Additionally, select an inductor with a saturation current rating above the peak switch current to avoid core saturation.
LT1076CQ - 2A Step-Down Switching Regulator | Analog Devices
The LT1076CQ is a monolithic bipolar step-down switching regulator from Analog Devices (formerly Linear Technology) that delivers up to 2A of switch current in a TO-263-6 (D2PAK) package. It operates as a buck, boost, or flyback converter with positive or negative output polarity, and features an adjustable output voltage starting from 2.5V. The device integrates the power switch, oscillator, control circuitry, and current limit components on a single chip, requiring only a few external parts for normal operation. A switching regulator is a voltage regulator that uses a switching element (transistor) to convert an input voltage to a desired output voltage with high efficiency, typically above 80%. Unlike linear regulators, switching regulators store energy in inductors and capacitors and switch the element on and off at a high frequency (100kHz for the LT1076) to control the output. This makes them ideal for applications where power dissipation and heat are concerns, such as battery-powered devices and industrial power supplies. Key features of the LT1076CQ include a 100kHz switching frequency, 8.5mA quiescent current, programmable current limit, and the ability to operate with input voltages up to 60V. The device also includes micropower shutdown for power saving. The TO-263-6 package provides excellent thermal performance with a low thermal resistance, enabling high power dissipation without external heatsinks in many applications. The LT1076CQ uses a classic positive buck topology but includes design innovations that allow it to be used as a positive-to-negative converter (flyback) and in boost configurations. The internal current limit is set at 2.6A (for the LT1076), and the oscillator frequency is preset at 100kHz, which balances efficiency and component size. The device is designed for rugged industrial environments, with a junction temperature range of -40°C to +125°C. Typical applications include industrial power supplies, battery chargers, distributed power systems, and automotive electronics. Its wide input voltage range and high efficiency make it suitable for systems that require step-down conversion from 24V or 48V buses. The LT1076CQ is also used in negative output applications, such as generating -5V from a positive input. When designing with the LT1076CQ, ensure proper input and output capacitor selection and inductor sizing to maintain stability and low ripple. The programmable current limit allows designers to set the maximum switch current to protect the circuit. The device is available in lead-free (PBF) and tape-and-reel (TR) options, and is RoHS compliant.
LT1076CQ#PBF - 2A Buck/Boost/Flyback Regulator | Analog Devices
The LT1076CQ#PBF is a monolithic bipolar switching regulator from Analog Devices (formerly Linear Technology) that delivers up to 2A of switch current in a TO-263-6 (D2PAK) package. It supports buck, boost, flyback, and inverting topologies with an adjustable output voltage from 2.5V to 50V. The device integrates the power switch, oscillator, control circuitry, and current limit components, requiring only a few external parts for operation. With a 100kHz switching frequency and current-mode PWM control, it offers excellent dynamic response and stability. A switching regulator is a voltage regulator that uses an inductor, switch, and diode to efficiently convert an input voltage to a desired output voltage. Unlike linear regulators, switching regulators achieve high efficiency by storing energy in the inductor and switching the power transistor on and off. The LT1076CQ#PBF belongs to the family of DC-DC converters, which are essential in power management systems for converting voltages in battery-powered devices, industrial equipment, and automotive electronics. Key features of the LT1076CQ#PBF include a 2A switch current rating, wide input voltage range up to 60V, and the ability to operate in multiple topologies. The current-mode control architecture provides inherent cycle-by-cycle current limiting and simplifies loop compensation. The device also features thermal shutdown and a low quiescent current, making it suitable for power-sensitive applications. The LT1076CQ#PBF uses a bipolar process technology, which provides robust performance and high reliability. The 100kHz switching frequency balances efficiency and component size, allowing for compact inductor and capacitor selections. The device's adjustable output voltage range of 2.5V to 50V provides flexibility for various output requirements. Typical applications include industrial power supplies, battery chargers, distributed power systems, and automotive electronics. The device's ability to step up, step down, or invert voltage makes it a versatile choice for many power conversion needs. When designing with the LT1076CQ#PBF, ensure proper PCB layout with short, low-inductance paths for the switch node and ground. Use appropriate input and output capacitors to minimize ripple and ensure stability. The thermal pad of the D2PAK package should be connected to a large copper area for heat dissipation.
LT1076CQ#TRPBF - 2A Buck/Boost/Flyback Regulator | Analog Devices
The LT1076CQ#TRPBF is a monolithic bipolar switching regulator from Analog Devices, rated for 2A switch current and designed for buck, boost, and flyback topologies. It operates from input voltages up to 45V and provides an adjustable output from 2.5V to 50V. The device integrates the power switch, oscillator, control circuitry, and current limit components on a single chip, requiring only a few external parts for normal operation. Housed in a TO-263-6 (D2PAK) package with 5 leads plus tab, it is suitable for surface-mount designs. A switching regulator is a voltage regulator that uses a series element that switches between on and off states to maintain a constant output voltage. Unlike linear regulators, switching regulators achieve high efficiency by storing energy in inductors and capacitors, making them ideal for applications where power dissipation and battery life are critical. The LT1076 belongs to the family of monolithic switching regulators, which integrate the control circuitry and power switch into a single IC, simplifying design and reducing component count. Key features of the LT1076CQ#TRPBF include a 2A switch current rating, a wide input voltage range of 7.3V to 45V, and an adjustable output voltage from 2.5V to 50V. The device operates at a switching frequency of 100kHz, balancing efficiency and component size. It also includes an output monitor and current limit protection, enhancing reliability in demanding applications. The TO-263 package provides excellent thermal performance, with a low thermal resistance that supports continuous operation at high load currents. Technically, the LT1076 uses a classic positive buck topology but includes design innovations that allow it to be configured as a positive-to-negative converter or a flyback converter. The internal oscillator and control circuitry are designed for stable operation across a wide range of input and output conditions. The device's bipolar process technology ensures robust performance and long-term reliability, making it a trusted choice for industrial and automotive power supplies. Typical applications include distributed power systems, battery chargers, and point-of-load converters. The LT1076 is particularly well-suited for industrial control systems, telecom equipment, and automotive electronics where a rugged, high-efficiency switching regulator is required. Its ability to handle both step-down and step-up configurations adds versatility to power supply designs. When designing with the LT1076CQ#TRPBF, ensure proper input and output capacitor selection to minimize ripple and maintain stability. The inductor value should be chosen based on the desired ripple current and switching frequency. Adequate PCB copper area is essential for thermal management, especially at high output currents.
LTC3882-1 - Dual Output PolyPhase Step-Down Controller | Analog Devices
The LTC3882-1 is a dual, PolyPhase DC/DC synchronous step-down switching regulator controller with a PMBus compliant serial interface, manufactured by Analog Devices. It uses a constant frequency, leading-edge modulation, voltage mode architecture for excellent transient response and output regulation. Each PWM channel can produce output voltages from 0.1V to 5.25V using a wide range of 3.3V compatible power stages. Up to four LTC3882-1 devices can operate in parallel for 2-, 3-, 4-, 6- or 8-phase operation, enabling scalable power solutions for high-current applications. A switching regulator controller is an integrated circuit that manages the power conversion process in a DC-DC step-down (buck) converter. Unlike a linear regulator, it uses high-frequency switching of power transistors to efficiently step down voltage, making it ideal for high-current applications where efficiency and thermal management are critical. The LTC3882-1 belongs to the family of digital power system management controllers, which combine analog regulation with digital monitoring and control via PMBus, allowing precise voltage and current management in complex systems. Key features include a PMBus compliant serial interface for system configuration and monitoring, readback of input voltage, output voltage, current, temperature, and fault status. The device supports sub-milliohm DCR sensing for accurate current measurement without high-power sense resistors. It also features constant frequency operation with leading-edge modulation for excellent transient response. The LTC3882-1 is available in a 40-pin QFN package, suitable for compact power designs. Technically, the LTC3882-1 integrates a digital power system management engine with analog control loops, enabling precise regulation and telemetry. The voltage mode architecture provides stable operation with a wide range of output capacitors. The PMBus interface allows real-time monitoring and configuration, reducing the need for external components and simplifying system design. The device operates from a 3.3V bias supply and can drive external power stages, making it flexible for various topologies. Typical applications include high-current point-of-load converters for servers, networking equipment, and data centers, where multiple phases are needed to deliver currents exceeding 100A. It is also used in industrial and telecommunications systems requiring precise voltage regulation and digital monitoring. The LTC3882-1's ability to parallel multiple devices makes it ideal for scalable power architectures. When designing with the LTC3882-1, ensure proper decoupling of the bias supply and careful layout of the power stage to minimize parasitic inductance. Use the LTpowerPlay software tool for system configuration and monitoring, which simplifies the design process and ensures optimal performance.
LTC3882-2 - Dual PolyPhase Step-Down Controller | Analog Devices
The LTC3882-2 is a dual, PolyPhase DC/DC synchronous step-down switching regulator controller with a PMBus-compliant serial interface, manufactured by Analog Devices (formerly Linear Technology). It uses a constant frequency, leading-edge modulation, voltage mode architecture for excellent transient response and output regulation. The device supports up to four LTC3882-2 controllers operating in parallel for 2-, 3-, 4-, 6- or 8-phase operation, enabling high-current, multi-phase power supplies with precise digital control and monitoring. A DC/DC switching regulator controller is an integrated circuit that manages the power stage of a switching converter, generating the PWM signals that drive external MOSFETs to step down a higher input voltage to a regulated lower output voltage. Unlike a linear regulator, it achieves high efficiency by switching power devices on and off, making it essential for power-hungry applications such as servers, telecom, and industrial systems. The LTC3882-2 belongs to the family of digital power management controllers, which combine analog regulation with digital configuration and telemetry via PMBus. Key features include a wide input voltage range of 4.5V to 24V, dual outputs with programmable output voltages from 0.5V to 5.5V, and a PMBus interface for configuration and monitoring. The device integrates high-side and low-side gate drivers, supports external MOSFETs for high-current applications, and provides accurate current sensing and temperature monitoring. It also features programmable switching frequency, soft-start, and fault protection, making it a versatile solution for complex power systems. Technically, the LTC3882-2 employs a voltage mode control architecture with leading-edge modulation, which provides excellent noise immunity and fast transient response. The PMBus interface allows real-time readback of input voltage, output voltage, output current, temperature, and fault status, enabling sophisticated power management and telemetry. The device is available in a 40-pin QFN package (6mm x 6mm) and operates over a junction temperature range of -40°C to +125°C. Typical applications include high-current FPGA and ASIC power supplies, server and datacenter power distribution, telecom and networking equipment, and industrial power systems. The LTC3882-2 is ideal for designs requiring precise voltage regulation, high efficiency, and digital control and monitoring capabilities. When designing with the LTC3882-2, ensure proper PCB layout for the high-current paths and adequate thermal management for the external MOSFETs. The PMBus interface simplifies configuration and monitoring, but careful attention to the I2C address and bus timing is required for reliable communication.
LTM4643EY#PBF - Quad 3A µModule Regulator | Analog Devices
The LTM4643EY#PBF is a quad DC/DC step-down µModule (power module) regulator from Analog Devices, delivering 3A per output with a total capability of up to 12A when outputs are paralleled. It operates over an input voltage range of 4V to 20V, or 2.375V to 20V with an external bias supply, and supports an adjustable output voltage from 0.6V to 3.3V. The module integrates the switching controller, power FETs, inductors, and support components in a compact BGA-77 package, simplifying design and reducing board space. A µModule regulator is a complete DC-DC converter system-in-package that includes the controller, power stage, inductors, and compensation, offering a high level of integration and ease of use. It belongs to the broader category of power management ICs, specifically switching regulators, and is designed for point-of-load (PoL) applications where space is critical and efficiency is paramount. The LTM4643EY#PBF is part of the LTM4643 series, which is known for its ultrathin profile and high power density. Key features include a wide input voltage range, configurable output voltage, high efficiency, and the ability to parallel outputs for higher current. The module operates at a switching frequency up to 1.2 MHz, allowing for small external components. It also includes output voltage tracking and sequencing capabilities, making it suitable for complex power supply designs. The BGA-77 package provides excellent thermal performance, with a low thermal resistance that enables operation at high ambient temperatures without derating. The LTM4643EY#PBF uses a current-mode control architecture, ensuring stable operation over a wide range of load conditions. The integrated inductors and power FETs reduce parasitic losses, contributing to high efficiency across the load range. The module also features overcurrent and overtemperature protection, enhancing system reliability. Typical applications include power supplies for FPGAs, ASICs, processors, and other digital ICs in networking, telecommunications, industrial, and data center equipment. The quad output configuration is ideal for powering multiple voltage rails from a single module, reducing component count and board area. When designing with the LTM4643EY#PBF, it is important to consider input and output capacitor selection, as well as thermal management. The module's exposed pad should be connected to a large copper area for heat dissipation. Additionally, the input voltage range and output current requirements must be carefully evaluated to ensure proper operation.
LTM4643IY#PBF - Quad 3A μModule Regulator | Analog Devices
The LTM4643IY#PBF is a quad DC/DC step-down µModule (power module) regulator from Analog Devices, delivering 3A per output with a configurable output array capable of paralleling outputs for up to 12A. It integrates the switching controllers, power MOSFETs, inductors, and support components into a compact 16mm x 16mm x 1.82mm LGA package, simplifying power supply design and reducing board space. A µModule regulator is a complete system-in-package (SiP) power management solution that combines a DC-DC controller, power transistors, inductors, and compensation circuitry into a single surface-mount package. This integration eliminates the need for external inductor selection and layout optimization, reducing design risk and time-to-market. The LTM4643 belongs to the µModule regulator family, which is part of the broader DC-DC converter category within power management ICs. Key features include an input voltage range of 4V to 20V (or 2.375V to 20V with an external bias supply), four independent outputs each adjustable from 0.6V to 3.3V, and a high-efficiency synchronous step-down architecture. The module supports output voltage tracking, remote sense, and parallel operation for higher current. Its ultrathin profile (1.82mm) enables low-profile designs for space-constrained applications. Technically, the LTM4643 uses a current-mode control architecture with internal compensation, ensuring stable operation across a wide range of output capacitors. The integrated inductors and power FETs are optimized for efficiency and thermal performance. The module includes overcurrent and overtemperature protection, enhancing system reliability. The LGA package provides excellent thermal dissipation through its exposed pad, allowing operation at full load without additional heatsinking in many applications. Typical applications include FPGA, ASIC, and DSP core power supplies, where multiple low-voltage rails are required. The LTM4643 is also ideal for telecom, networking, and industrial systems that demand high-density, high-efficiency power conversion. Its ability to parallel outputs makes it suitable for high-current rails up to 12A. When designing with the LTM4643, ensure adequate input and output capacitance as specified in the datasheet. The module's internal compensation simplifies design, but proper PCB layout with a solid ground plane and thermal vias is essential for optimal thermal and electrical performance.
LTM4644IY#PBF - Quad 4A DC/DC μModule Regulator | Analog Devices
The LTM4644IY#PBF is a quad-output, step-down DC/DC μModule (power module) regulator from Analog Devices, delivering 4A per output with a configurable output array capable of up to 16A when outputs are paralleled. It operates from a 4V to 14V input supply and provides adjustable outputs from 0.6V to 5.5V. The module integrates the switching controller, power FETs, inductors, and supporting components in a compact 77-pin BGA package, simplifying power supply design and reducing board space. A μModule regulator is a complete DC/DC converter system-in-package that includes the controller, power transistors, inductors, and compensation circuitry, requiring only input/output capacitors and resistors to set the output voltage. This integration reduces design risk, shortens time-to-market, and improves reliability by minimizing external component count and layout sensitivity. The LTM4644 belongs to the family of μModule regulators, which are part of the broader category of power management ICs used in point-of-load (PoL) applications. Key features include four independent 4A outputs, a wide 4V to 14V input range, adjustable output voltage down to 0.6V, and high efficiency across the load range. The module supports output voltage tracking and sequencing for complex multi-rail systems, and includes overcurrent and overtemperature protection. The BGA package provides excellent thermal performance, with an exposed pad for heat dissipation to the PCB. The LTM4644IY#PBF is designed for high-performance digital loads such as FPGAs, DSPs, ASICs, and processors that require multiple low-voltage, high-current rails. Its ability to parallel outputs enables scalable current delivery up to 16A, making it suitable for a wide range of power-hungry applications. The module's integrated inductors and controllers ensure consistent performance and reduce EMI compared to discrete designs. Typical applications include FPGA and ASIC power supplies, telecom and networking equipment, industrial systems, and medical devices. The wide input range and adjustable output make it versatile for various PoL requirements. When designing with this module, ensure adequate input and output capacitance as specified in the datasheet, and provide a thermal relief pattern for the BGA pad to maintain junction temperature within limits.
MAX17633BATP+T - 36V, 3.5A Synchronous Buck Converter | Analog Devices
The MAX17633BATP+T is a high-efficiency, high-voltage, synchronous step-down DC-DC converter from Analog Devices, part of the Himalaya series. It operates over an input voltage range of 4.5V to 36V and delivers up to 3.5A of output current. The device integrates MOSFETs and is available in a 20-WFQFN exposed pad package, making it suitable for space-constrained industrial and telecom power supplies. A synchronous buck converter is a type of DC-DC switching regulator that steps down a higher input voltage to a lower output voltage with high efficiency. It uses two MOSFETs (high-side and low-side) to alternately connect the inductor to the input and ground, minimizing conduction losses compared to asynchronous designs. This topology is essential in power management systems where efficiency and thermal performance are critical, such as in base stations, distributed power architectures, and point-of-load (POL) converters. Key features of the MAX17633BATP+T include an adjustable output voltage from 0.9V, a MODE/SYNC pin for selecting PWM, PFM, or DCM control schemes, adjustable input undervoltage lockout (UVLO), adjustable soft-start, open-drain RESET output, and external clock synchronization. The switching frequency is programmable from 380kHz to 2.45MHz, allowing designers to optimize efficiency versus component size. The device also offers high efficiency across a wide load range, reducing power dissipation and enabling cooler operation. The MAX17633BATP+T is designed for robust performance in harsh environments. It includes cycle-by-cycle current limiting, thermal shutdown, and short-circuit protection. The adjustable soft-start prevents inrush current during startup, and the open-drain RESET output provides a power-good signal for system sequencing. The device is available in a 20-WFQFN package with an exposed pad for enhanced thermal performance, and it is RoHS compliant. Typical applications include base-station power supplies, distributed supply regulation, general-purpose point-of-load converters, high-voltage single-board systems, industrial control power supplies, and wall transformer regulation. Its wide input range and high output current make it ideal for 12V and 24V bus systems, as well as for powering FPGAs, ASICs, and processors in industrial and telecom equipment. When designing with the MAX17633BATP+T, ensure proper PCB layout with adequate input and output capacitance, and place the inductor and feedback resistors close to the IC to minimize parasitic inductance. The exposed pad should be soldered to a large copper area for effective heat dissipation. The MODE/SYNC pin allows synchronization to an external clock to reduce EMI in multi-rail systems.
RHP50000 - 12.5A Silent Switcher 2 Step-Down | Analog Devices
The RHP50000-CSL is a very small, low noise, monolithic step-down DC/DC converter from Analog Devices, capable of delivering up to 12.5A of output current from a 2.25V to 5.5V input supply. It employs the Silent Switcher 2 architecture with internal hot loop bypass capacitors to achieve both low EMI and high efficiency at switching frequencies as high as 5MHz. The device is available in an 18-lead TFQFN package with exposed pad, making it suitable for space-constrained, high-current power delivery in commercial space and other demanding applications. A step-down DC/DC converter, also known as a buck converter, is a type of switching regulator that efficiently converts a higher input voltage to a lower output voltage. Unlike linear regulators, which dissipate excess power as heat, buck converters use switching elements and energy storage components to achieve high efficiency, especially when the input-to-output voltage difference is large. The RHP50000 is a synchronous buck converter, meaning it uses two MOSFETs (high-side and low-side) to minimize conduction losses and eliminate the need for an external Schottky diode. This architecture is fundamental to modern power management ICs, enabling compact, high-current power solutions for processors, FPGAs, and other digital loads. Key features of the RHP50000 include its 12.5A output current capability, 2.25V to 5.5V input voltage range, and adjustable output voltage down to 0.5V. The Silent Switcher 2 architecture integrates bypass capacitors to reduce EMI, simplifying PCB layout and reducing the need for external filtering. The device operates at switching frequencies up to 5MHz, allowing the use of small inductors and capacitors, which reduces solution footprint. It also features a precision enable pin, soft-start, and power-good output for reliable power sequencing. Technically, the RHP50000 uses a current-mode control architecture with internal compensation, providing fast transient response and stable operation over a wide range of output capacitors. The integrated hot loop bypass capacitors minimize parasitic inductance in the switching loops, which is critical for achieving low EMI at high frequencies. The device also includes overcurrent protection, thermal shutdown, and undervoltage lockout to ensure robust operation in harsh environments. Typical applications include powering FPGAs, ASICs, and processors in commercial space systems, as well as high-current point-of-load (POL) converters in networking, telecommunications, and industrial equipment. The wide input range and high output current make it ideal for 5V or 3.3V rails that need to step down to core voltages like 1.2V or 0.9V. When designing with the RHP50000, pay careful attention to the input and output capacitor placement to minimize parasitic inductance. The AGND pin should be connected to the negative terminal of the output capacitor at the load for good load regulation. Use a solid ground plane and follow the layout guidelines in the datasheet to achieve the best EMI performance.
ST1S10PHR - 3A, 2.5V to 18V Step-Down DC-DC Converter | STMicroelectronics
The ST1S10PHR is a step-down switching regulator from STMicroelectronics, designed to deliver up to 3A of output current from an input voltage range of 2.5V to 18V. Housed in a PowerSO-8 package, this DC-DC converter integrates a high-side MOSFET and uses a current-mode PWM control scheme to achieve high efficiency across a wide load range. The device operates at a fixed switching frequency of 900 kHz, allowing for small external inductor and capacitor values, which reduces the overall solution footprint. A DC-DC converter is an electronic circuit that converts a source of direct current (DC) from one voltage level to another. It is a type of power converter, and more specifically, a switching regulator that uses energy storage elements such as inductors and capacitors to transfer energy from input to output in discrete packets. DC-DC converters are fundamental building blocks in power management systems, enabling efficient voltage conversion for a wide range of electronic devices, from portable electronics to industrial equipment. They are part of the broader category of power management integrated circuits (PMICs), which also includes linear regulators, battery chargers, and LED drivers. Key features of the ST1S10PHR include a 3A output current capability, an input voltage range of 2.5V to 18V, and a fixed 900 kHz switching frequency. The device offers a typical efficiency of 90% at 3A load, and includes internal soft-start to limit inrush current during startup. It also features overcurrent protection and thermal shutdown, ensuring reliable operation under fault conditions. The PowerSO-8 package provides excellent thermal performance, with a thermal resistance of 40°C/W, enabling operation at high ambient temperatures without external heatsinking. The ST1S10PHR uses a current-mode control architecture, which provides fast transient response and simplifies loop compensation. The integrated high-side MOSFET reduces external component count, while the internal compensation network further simplifies design. The device supports a wide output voltage range from 0.8V to VIN, set by an external resistor divider. The 900 kHz switching frequency allows the use of small, low-profile inductors and ceramic capacitors, making it suitable for space-constrained applications. Typical applications include point-of-load (POL) converters for FPGAs, DSPs, and microprocessors, as well as distributed power systems, set-top boxes, and LCD TVs. The wide input voltage range makes it suitable for 12V and 5V bus systems, while the high efficiency extends battery life in portable devices. The device is also used in networking equipment, industrial control systems, and automotive infotainment. When designing with the ST1S10PHR, ensure proper input and output capacitor selection to minimize voltage ripple and maintain stability. The input capacitor should be placed close to the VIN pin, and the output capacitor should be selected based on the desired output ripple and transient response. The feedback resistor divider should use 1% tolerance resistors to maintain output voltage accuracy. The exposed pad on the PowerSO-8 package should be soldered to a large copper area for optimal thermal performance.
ST1S12GR - 3A, 18V Synchronous Step-Down Regulator | STMicroelectronics
The ST1S12GR is a high-efficiency synchronous step-down (buck) DC-DC converter from STMicroelectronics, designed to deliver up to 3A of continuous output current from an input voltage range of 4.5V to 18V. Housed in a compact SOT-23-6 package, this regulator integrates both high-side and low-side MOSFETs, eliminating the need for external Schottky diodes and simplifying PCB layout. The device operates at a fixed 1.5MHz switching frequency, allowing the use of small, low-cost inductors and capacitors, which is ideal for space-constrained applications. A synchronous buck converter is a type of DC-DC step-down regulator that uses two active switches (typically MOSFETs) instead of a diode for the low-side element, improving efficiency by reducing conduction losses. In the power management hierarchy, a synchronous buck converter falls under DC-DC converters, which are a subset of voltage regulators, which in turn are part of power management ICs. This architecture is essential in battery-powered and high-current systems where thermal performance and efficiency are critical. Key features of the ST1S12GR include a 3A output current capability, an adjustable output voltage from 0.8V to VIN, and a high efficiency of up to 95% at light loads. The device also features internal soft-start to limit inrush current, overcurrent protection, and thermal shutdown. The 1.5MHz switching frequency enables a compact solution footprint, and the SOT-23-6 package (also known as TSOT-6) is widely used in portable electronics. Technically, the ST1S12GR employs a current-mode control architecture, providing fast transient response and stable operation with ceramic output capacitors. The integrated MOSFETs have low RDS(on), minimizing conduction losses, while the synchronous rectification improves efficiency at heavy loads. The device supports 100% duty cycle operation, allowing the output to be very close to the input voltage, which is beneficial for battery-powered applications where the input voltage can drop near the output. Typical applications include point-of-load (POL) converters for FPGAs, DSPs, and microcontrollers, as well as power supplies for set-top boxes, networking equipment, and industrial control systems. The wide input range also makes it suitable for 12V and 24V industrial bus systems, providing a regulated 3.3V or 5V rail. When designing with the ST1S12GR, ensure proper input and output capacitor selection to maintain stability and low output ripple. The inductor value should be chosen based on the desired ripple current, typically 30% of the maximum load current. Place the input capacitor close to the VIN pin to minimize parasitic inductance, and use a solid ground plane for thermal management.
ST1S14PHR - 3A 36V Step-Down Switching Regulator | STMicroelectronics
The ST1S14PHR is a step-down switching regulator from STMicroelectronics, designed to deliver up to 3A of continuous output current from a wide input voltage range of 4.5V to 36V. Housed in a compact PowerSO-8 package, this regulator integrates a high-side power MOSFET and provides a fixed 250kHz switching frequency, making it suitable for a variety of industrial and automotive power supply applications. A step-down switching regulator, also known as a buck converter, is a type of DC-DC converter that efficiently reduces a higher input voltage to a lower output voltage. Unlike linear regulators, which dissipate excess power as heat, switching regulators use an inductor and a switch to transfer energy in discrete packets, achieving high efficiency, especially when the input-to-output voltage difference is large. The ST1S14PHR belongs to the family of voltage regulators, specifically switching regulators, which are essential components in power management systems for converting and stabilizing voltages across electronic devices. Key features of the ST1S14PHR include a wide input voltage range of 4.5V to 36V, an adjustable output voltage from 1.2V to 36V, and a maximum output current of 3A. The device offers a high efficiency of up to 90%, a low quiescent current of 2.5mA, and a switching frequency of 250kHz. It also includes internal compensation, a soft-start function, and a thermal shutdown protection, ensuring reliable operation in demanding environments. The ST1S14PHR utilizes a current-mode control architecture, which provides fast transient response and simplifies loop compensation. The integrated high-side MOSFET reduces external component count, while the internal compensation network eliminates the need for external compensation components. The device operates over a junction temperature range of -40°C to +150°C, making it suitable for automotive and industrial applications where temperature extremes are common. Typical applications include point-of-load (POL) converters, distributed power systems, industrial control systems, and automotive infotainment and body electronics. The wide input voltage range allows the ST1S14PHR to operate directly from 12V or 24V supply rails, while the high output current capability supports powering microprocessors, FPGAs, and other digital loads. When designing with the ST1S14PHR, ensure proper PCB layout with short, low-inductance paths for the power stage. The exposed pad on the PowerSO-8 package should be soldered to a large copper area for effective heat dissipation. Additionally, select an inductor with a saturation current rating above the peak switch current to avoid core saturation and ensure stable operation.
ST1S40PUR - 3A, 4V to 18V Step-Down Converter | STMicroelectronics
The ST1S40PUR is a high-efficiency, monolithic step-down switching regulator from STMicroelectronics, designed to deliver up to 3A of continuous output current from an input voltage range of 4V to 18V. Housed in a compact 6-pin DFN (DFN6) package with an exposed pad, this device integrates a low-side MOSFET and synchronous rectification to achieve efficiencies up to 90% in typical applications. The output voltage is adjustable from 0.8V to VIN, set by an external resistor divider, making it suitable for a wide range of point-of-load (POL) applications. A step-down (buck) converter is a type of DC-DC switching regulator that steps down an input voltage to a lower output voltage with high efficiency. Unlike linear regulators, which dissipate excess power as heat, buck converters use an inductor and switching elements to transfer energy in discrete packets, achieving efficiencies often above 85%. In the power management hierarchy, a buck converter is a type of switching regulator, which is a subset of voltage regulators, which in turn are part of power management ICs (PMICs) used in virtually all electronic systems to provide stable, efficient power rails. Key features of the ST1S40PUR include a fixed 1.5MHz switching frequency, which allows the use of small external components (inductor and capacitors), reducing PCB footprint. The device offers a low quiescent current of 1.5mA in light-load operation, and a shutdown mode that reduces current consumption to less than 1uA. Protection features include overcurrent protection (OCP), thermal shutdown, and under-voltage lockout (UVLO). The DFN6 package (3mm x 3mm) has a thermal resistance of 45°C/W, enabling efficient heat dissipation in compact designs. The ST1S40PUR uses a current-mode control architecture with internal compensation, simplifying the design process. The high switching frequency minimizes the size of the output inductor (typically 2.2uH to 4.7uH) and output capacitors, making it ideal for space-constrained applications. The device also features a soft-start function to limit inrush current during startup, and an enable pin for power sequencing. Typical applications include distributed power systems, set-top boxes, LCD TVs, networking equipment, and industrial control systems. The wide input range and high output current make it suitable for powering FPGAs, DSPs, and microprocessors from 12V or 5V rails. In set-top boxes, the ST1S40PUR efficiently converts a 12V input to a 3.3V or 1.8V rail for core logic, reducing heat and improving reliability. When designing with the ST1S40PUR, ensure proper PCB layout with short, wide traces for high-current paths and a solid ground plane. Place the input capacitor close to the VIN pin and the output inductor close to the SW pin to minimize parasitic inductance. The exposed pad should be soldered to a large copper area for thermal management.