LM2596SX-ADJ/NOPB - 3A Step-Down Regulator | Texas Instruments
MPN: LM2596SX-ADJ/NOPB ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.08 | $30.80 |
| 100 | $2.47 | $247.00 |
| 500 | $2.12 | $1,060.00 |
| 1,000 | $1.79 | $1,790.00 |
Drop-in alternatives for LM2596SX-ADJ/NOPB — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LM2596S-ADJ/NOPB
✅ Drop-In📋 Reference alternative (not in catalog)
LM2596SX-ADJ
✅ Drop-In📋 Reference alternative (not in catalog)
XL2596S-ADJ
✅ Drop-In📋 Reference alternative (not in catalog)
LM2596SX-ADJ/NOPB Maximum Ratings & Electrical Characteristics
| Function | Step-Down (Buck) |
| Output Type | Adjustable |
| Output Voltage Range | 1.2 V to 37 V |
| Maximum Output Current | 3 A |
| Input Voltage Range | 4.5 V to 40 V |
| Switching Frequency | 150 kHz |
| Synchronous Rectifier | No |
| Number of Outputs | 1 |
| Operating Temperature Range | -40°C to +125°C (junction) |
| Package | TO-263-6 (D2PAK, 5 Leads + Tab) |
| Mounting Type | Surface Mount |
| RoHS Status | Compliant |
| REACH Status | Compliant |
| MSL Level | 3 (168 hours) |
| Efficiency | Up to 90% (typical) |
LM2596SX-ADJ/NOPB Pin Configuration
| Pin 1 | VIN — Input supply voltage (4.5V to 40V) |
| Pin 2 | OUT — Switching output, connect to inductor |
| Pin 3 | GND — Ground |
| Pin 4 | FB — Feedback pin for output voltage sensing |
| Pin 5 | ON/OFF — Enable pin, active high |
| Pin Tab | GND — Exposed pad, connect to ground for thermal relief |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
LM2596SX-ADJ/NOPB is suitable for 6 applications: Point-of-Load Regulation, Battery-Powered Devices, Industrial Control Systems, Automotive Electronics, Telecom and Networking Equipment, DIY and Maker Projects.
Point-of-Load Regulation
The LM2596SX-ADJ/NOPB is ideal for point-of-load (POL) regulation in systems with 12V or 24V buses, providing a stable 3.3V or 5V rail for digital ICs. Its 3A output can power multiple loads, and the adjustable output allows fine-tuning. The 150kHz switching frequency enables small inductors, saving board space. For example, in an industrial controller, it can step down 24V to 5V for a microcontroller and sensors, with efficiency up to 90% at moderate loads. The wide input range ensures compatibility with unregulated supplies, and the thermal shutdown protects the system.
Recommended
Battery-Powered Devices
In battery-powered devices, the LM2596SX-ADJ/NOPB efficiently converts battery voltage (e.g., 12V lead-acid or 3-cell Li-ion) to a regulated 5V or 3.3V rail. Its low quiescent current and high efficiency extend battery life. The adjustable output allows matching the exact voltage required by the load. For instance, in a portable instrument, it can step down 12V to 5V for analog circuits, with the 150kHz switching frequency minimizing EMI. The device's thermal shutdown and current limiting protect the battery and load. The TO-263 package is suitable for compact designs when combined with a small inductor.
Recommended
Industrial Control Systems
The LM2596SX-ADJ/NOPB is well-suited for industrial control systems that operate from 24V DC supplies. Its wide input range (up to 40V) handles voltage transients, and the 3A output can drive relays, actuators, and control logic. The adjustable output allows generating multiple rails from a single input. For example, in a PLC, it can step down 24V to 5V for the logic core and 12V for analog sensors. The device's robustness, including thermal shutdown and current limiting, ensures reliable operation in harsh environments. The TO-263 package with exposed tab aids heat dissipation in enclosed cabinets.
Recommended
Automotive Electronics
In automotive applications, the LM2596SX-ADJ/NOPB can step down the vehicle's 12V battery voltage to 5V or 3.3V for infotainment, sensors, and control units. Its input range (4.5V to 40V) accommodates load dump transients up to 40V. The 3A output is sufficient for many loads, and the adjustable output provides flexibility. The device operates over -40°C to +125°C, meeting automotive temperature requirements. However, it is not AEC-Q100 qualified, so for strict automotive grade, consider the LM2596-Q1 variant. The TO-263 package is suitable for engine control units where space is limited.
Recommended
Telecom and Networking Equipment
The LM2596SX-ADJ/NOPB is used in telecom and networking equipment to convert 48V or 24V backplane voltages to local logic rails. Its wide input range (up to 40V) covers 24V systems, and for 48V, a pre-regulator may be needed. The 3A output can power FPGAs, ASICs, and line cards. The adjustable output allows setting precise voltages. The 150kHz switching frequency is low enough to minimize EMI, which is critical in communication systems. The device's simplicity reduces BOM count, and its reliability ensures continuous operation. For higher efficiency, synchronous alternatives like TPS5430 may be preferred.
Recommended
DIY and Maker Projects
The LM2596SX-ADJ/NOPB is a popular choice for DIY power supply modules and maker projects due to its low cost and ease of use. It can be used to build adjustable bench power supplies, battery chargers, or fixed voltage regulators. The adjustable output allows experimentation with different voltages. The device requires only a few external components, making it ideal for breadboard and PCB prototyping. Its 3A output can power motors, LEDs, and microcontrollers. The TO-263 package is easy to solder with basic tools. Many online tutorials and reference designs are available, simplifying the learning curve.
Recommended
Recommended Products Summary
Engineering reference data for LM2596SX-ADJ/NOPB — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LM2596S-ADJ/NOPB | XL2596S-ADJ | MP1584EN |
|---|---|---|---|---|
| Package | TO-263-6 (D2PAK) | TO-263-6 (D2PAK) | TO-263-6 (D2PAK) | SOIC-8 |
| Brand | Texas Instruments | Texas Instruments | XLSEMI | Monolithic Power Systems |
| Output Current | 3 A | 3 A | 3 A | 3 A |
| Input Voltage Range | 4.5V to 40V | 4.5V to 40V | 4.5V to 40V | 4.5V to 28V |
| Output Voltage Range | 1.2V to 37V | 1.2V to 37V | 1.2V to 37V | 0.8V to 20V |
| Switching Frequency | 150 kHz | 150 kHz | 150 kHz | 1.5 MHz |
| Synchronous Rectification | No | No | No | No |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +85°C |
Key Differentiators
- Wide input voltage range up to 40V (vs MP1584EN)
- Low switching frequency (150kHz) reduces EMI (vs MP1584EN)
- Proven SIMPLE SWITCHER® design with extensive documentation (vs XL2596S-ADJ)
Design Notes
For optimal thermal performance, solder the exposed pad (tab) of the TO-263 package to a large copper area on the PCB. Use multiple vias to connect the pad to internal ground planes. Ensure the copper area is at least 1 square inch for 3A operation. Place input and output capacitors close to the IC pins to minimize parasitic inductance.
Select an inductor with a saturation current rating higher than the peak switch current (typically 1.2 times the maximum load current). For 3A output, use an inductor with a saturation current of at least 4A. The inductor value should be chosen based on the output voltage and switching frequency to maintain continuous conduction mode. Refer to the datasheet's inductor selection table.
Do not operate the LM2596SX-ADJ/NOPB without a load, as this can cause output voltage to rise above the set value. Always include a minimum load (e.g., 10mA) or use a preload resistor. Also, ensure the feedback resistor divider uses 1% tolerance resistors to maintain output accuracy. Avoid routing the feedback trace near the inductor to prevent noise coupling.
Compliance Information
RoHS and REACH compliant per TI product page. Not AEC-Q100 qualified; automotive grade variant LM2596-Q1 is available.
