LMR14030SDDA - 40V 3.5A 2.2MHz Buck Converter | TI
MPN: LMR14030SDDA β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.42 | $2.42 |
| 10 | $2.18 | $21.80 |
| 100 | $1.92 | $192.00 |
| 500 | $1.74 | $870.00 |
| 1,000 | $1.58 | $1,580.00 |
LMR14030SDDA Overview
A step-down (buck) regulator is a switching DC-DC power converter that transforms a higher input voltage into a lower, regulated output voltage using an internal switch, an inductor, and a diode or synchronous switch. Within the power management IC hierarchy, the LMR14030 sits in the non-synchronous buck converter family, part of TI's SIMPLE SWITCHER line of easy-to-design-in regulators, which itself belongs to the broader category of switching voltage regulators used after upstream AC-DC or unregulated DC sources.
Key features include a wide 4 V to 40 V input range that tolerates industrial 24 V rails and automotive load-dump transients, an adjustable output from 0.8 V up to 36 V (30 V on the Q1 variant), and 3.5 A of continuous output current. The 40 uA sleep-mode quiescent current and ultra-low 1 uA shutdown current make it well suited to battery-powered and always-on systems, while the adjustable switching frequency from 200 kHz to 2.5 MHz lets designers trade efficiency against inductor size.
Technically, the internally compensated current-mode architecture minimizes external component count and simplifies loop design, a hallmark of the SIMPLE SWITCHER family. The integrated 40 V high-side MOSFET eliminates an external transistor, and the PowerPAD (DDA) package provides a low thermal impedance path to the PCB copper for reliable dissipation at 3.5 A.
Typical applications include 24 V industrial automation power conditioning, 12 V/24 V automotive auxiliary rails, and point-of-load conversion from unregulated wall adapters. The wide input range and low IQ directly address these use cases.
Design consideration: the switching frequency setting controls inductor ripple current - at 2.2 MHz a compact 4.7 uH inductor works well, but verify thermal performance at high VIN-VOUT differentials.
This page synthesizes verified distributor data, drop-in family alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for LMR14030SDDA β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LMR14030SDDA (same form factor and footprint) β differing in Maximum Output Current, Output Voltage Range, Package, Topology.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
LMR14030SQDDARQ1
β Drop-Inπ Reference alternative (not in catalog)
LMR14050SDDA
β Drop-In β οΈ εζ°εΎ ιͺθ―β In Stock
$1.82 / Unit
View Datasheet βLMR14020SDDA
β Drop-In β οΈ εζ°εΎ ιͺθ―π Reference alternative (not in catalog)
LMR14030SDDA Maximum Ratings & Electrical Characteristics
| Topology | Step-Down (Buck) Converter |
| Input Voltage Range | 4 V to 40 V |
| Output Voltage Range | 0.8 V to 36 V (adjustable) |
| Maximum Output Current | 3.5 A |
| Switching Frequency (max) | 2.5 MHz |
| Switching Frequency (min) | 200 kHz |
| Quiescent Current (sleep mode) | 40 uA |
| Shutdown Current | 1 uA |
| Number of Outputs | 1 |
| Output Type | Positive, Adjustable |
| Integrated High-Side MOSFET | Yes |
| Operating Temperature | -40C to +125C |
| Package | 8-Pin HSOIC (DDA) with PowerPAD, 3.90 mm width |
| Mounting Type | Surface Mount |
| Marking Code | DB3SP |
| Series | SIMPLE SWITCHER LMR14030 |
LMR14030SDDA Pin Configuration
| Pin 1 | BOOT β Bootstrap capacitor connection for high-side gate driver |
| Pin 2 | IN β Input supply voltage, 4 V to 40 V |
| Pin 3 | EN β Enable pin with precision threshold; pull low for 1 uA shutdown |
| Pin 4 | RT/SYNC β Switching frequency setting resistor or external synchronization input |
| Pin 5 | GND β Ground reference |
| Pin 6 | FB β Feedback input for output voltage regulation via resistor divider |
| Pin 7 | SS β Soft-start programming pin |
| Pin 8 | SW β Switch node connecting to output inductor and bootstrap diode |
Typical Applications
LMR14030SDDA is suitable for 6 applications: Industrial 24V Bus Power Conditioning, Automotive Auxiliary Power Rails, Battery-Powered Portable Instruments, Point-of-Load Conversion from Wall Adapters, LED Lighting and Display Backlight Supplies, Networking and Telecom Infrastructure Boards.
Industrial 24V Bus Power Conditioning
Industrial automation cabinets run on 24 V (or higher unregulated) buses that fluctuate with load and line conditions. The LMR14030SDDA fits this application directly: its 4 V to 40 V input range absorbs 24 V rail excursions and transients, while the 3.5 A output drives PLC I/O modules, sensor hubs, and communication boards. Operating at a 2.2 MHz switching frequency, a compact shielded 4.7 uH to 10 uH inductor keeps the solution height under 5 mm for dense DIN-rail modules. The 40 uA sleep-mode IQ supports always-on monitoring electronics that must stay within system standby budgets. Placed after input TVS protection and a small pi filter, the internally compensated current-mode loop delivers stable 5 V or 12 V point-of-load rails with minimal external components, shortening qualification cycles for industrial equipment vendors.
Recommended
Automotive Auxiliary Power Rails
In 12 V and 24 V vehicle electrical systems, auxiliary ECUs need robust buck converters that tolerate cold-crank and load-dump conditions. The LMR14030SDDA's 40 V absolute input rating covers transient events, and its automotive-qualified sibling LMR14030SQDDARQ1 (AEC-Q100, identical DDA-8 footprint) allows a single PCB design to serve both industrial and automotive builds. The 3.5 A capability powers camera modules, telematics units, and gateway processors. At 2.2 MHz operation the converter sits above the AM broadcast band, simplifying conducted EMI filter design per CISPR requirements - a smaller input filter saves board area. The 1 uA shutdown current supports systems that must draw near-zero current when the vehicle is parked, protecting battery state of charge over long idle periods.
Recommended
Battery-Powered Portable Instruments
Handheld test instruments, dataloggers, and portable field equipment benefit from the LMR14030SDDA's 40 uA sleep-mode quiescent current and 1 uA shutdown current, which directly extend battery life during idle periods. Powered from a multi-cell lithium-ion stack (up to 40 V absolute), the converter generates a regulated 3.3 V, 5 V, or 12 V rail for displays, radios, and analog front ends at up to 3.5 A peak. The wide 200 kHz to 2.5 MHz frequency range lets designers pick a frequency that avoids sensitive receive bands in wireless-enabled instruments while still keeping the inductor small. High efficiency at the selected operating point reduces internal heating, and the DDA PowerPAD keeps junction temperature low inside sealed enclosures with limited airflow - a common constraint in portable product mechanical design.
Recommended
Point-of-Load Conversion from Wall Adapters
Unregulated wall adapters and generic AC-DC bricks output anywhere from 9 V to 36 V depending on load, and the LMR14030SDDA is explicitly designed by TI for conditioning from unregulated sources. Its 40 V input ceiling protects against no-load adapter overshoot, while the adjustable 0.8 V reference supports precise output setpoints with a 1% resistor divider. Delivering 3.5 A, it powers single-board computers, displays, and motor-control boards directly from a single brick without an intermediate stage. The 2.2 MHz capability shrinks the output LC filter so the converter fits inside adapter-plug-class enclosures or behind display bezels. Designers should budget input bulk capacitance near the IN pin and verify thermal margin at maximum VIN-VOUT differential and full load using the PowerPAD PCB thermal design.
Recommended
LED Lighting and Display Backlight Supplies
Industrial LED fixtures and display backlight drivers require a stable current or voltage rail derived from 24 V or 36 V sources. The LMR14030SDDA regulates a constant-voltage rail feeding an LED string driver, or can be configured as a simple buck LED driver using the FB pin to sense current across a shunt. Its 36 V maximum output allows direct-series-string topologies on 24 V fixtures, and the 3.5 A capability covers high-brightness channel power. Operating above 2 MHz moves switching artifacts out of visible-band coupling paths, reducing flicker risk in camera-visible applications such as machine-vision lighting. The adjustable frequency also supports designs that must skip specific RF bands in broadcast-studio lighting. Low sleep IQ matters in occupancy-controlled fixtures that spend extended periods in standby.
Recommended
Networking and Telecom Infrastructure Boards
Line cards, switches, and small-cell radios distributed across a 24 V or 48 V-derived intermediate bus use compact buck converters at each functional block. The LMR14030SDDA's 40 V rating handles the upper end of 24 V-class intermediate buses and rectified telecom supplies, and its 3.5 A output powers Ethernet PHY groups, microcontroller sections, and memory rails. The 2.5 MHz maximum frequency is a decisive advantage here: it places the switching fundamental well above sensitive receive bands and permits sub-2 uH inductors for maximum power density on crowded line cards. The RT/SYNC pin lets designers synchronize multiple converters to a single system clock, suppressing low-frequency beat frequencies that appear as audible noise and conducted emissions. The PowerPAD DDA package dissipates heat into the ground plane, keeping hot spots away from PHY magnetics.
Recommended
Recommended Products Summary
Engineering reference data for LMR14030SDDA β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LMR14030SQDDARQ1 | LMR14050SDDA | LMR14020SDDA |
|---|---|---|---|---|
| Package | HSOIC (DDA)-8 PowerPAD | HSOIC (DDA)-8 PowerPAD - same | HSOIC (DDA)-8 PowerPAD - same | HSOIC (DDA)-8 PowerPAD - same |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Maximum Output Current | 3.5 A | 3.5 A | 5.0 A | 2 A |
| Input Voltage Range | 4 V to 40 V | 4 V to 40 V | 4 V to 40 V | 4 V to 40 V |
| Quiescent Current | 40 uA | 40 uA | 40 uA | 40 uA |
| Switching Frequency Range | 200 kHz to 2.5 MHz | 200 kHz to 2.5 MHz | 200 kHz to 2.5 MHz | 200 kHz to 2.5 MHz |
| Automotive Grade (AEC-Q100) | No | Yes (AEC-Q100) | No | No |
Key Differentiators
- Ultra-low 40 uA sleep-mode quiescent current (vs TPS54331DRCR)
- 40 V input vs 28 V input class (vs TPS54331DRCR)
- Family scalability from 2 A to 5 A on one footprint (vs LMR14050SDDA)
Design Notes
The DDA (HSOIC-8) PowerPAD must be soldered to a copper ground plane - do not treat the thermal pad as optional. Estimated: at VIN=24 V, VOUT=5 V, IOUT=3 A, power dissipation in the high-side MOSFET and diode is on the order of 1.5-2 W; with typical PowerPAD theta_JA around 40-50 C/W on a good 4-layer board, junction rise is 60-100 C above ambient, so keep ambient below 60 C for full-load industrial designs. Verify against the datasheet thermal table for your exact copper area.
Keep the loop from IN capacitor, through the internal MOSFET, out the SW pin, through the catch diode/inductor, and back to ground as physically small as possible - this hot loop dominates EMI. Place the input ceramic capacitor (10 uF plus 0.1 uF) within 2-3 mm of the IN pin. Route the feedback trace away from the SW node and inductor, or shield it with ground on both sides. Bootstrap capacitor (0.1 uF) from BOOT to SW must sit directly across pins 1 and 8.
Set the switching frequency with the RT/SYNC resistor deliberately: at 2.2 MHz you gain small magnetics but lose efficiency at high VIN-VOUT ratios; at 400-500 kHz efficiency improves but the inductor roughly doubles in size. Do not exceed the 40 V absolute maximum input - unregulated adapters and 24 V industrial supplies with transients need input TVS protection (e.g., an SMBJ series device) upstream. Also ensure the soft-start pin is properly programmed for capacitive loads above ~100 uF to prevent inrush-induced current limit tripping.
Compliance Information
Offered as lead-free RoHS-compliant production part per TI/distributor listings. AEC-Q100 qualification applies only to the LMR14030SQDDARQ1 variant. Formal REACH and conflict-mineral declarations available from TI quality documentation.
