component
LMR51430
Public Made by Adomby adom
TI 3 A synchronous step-down converter, SOT-23-6. 4-36 V in, integrated FETs, small solution. Datasheet-verified.
3D Model
Open in new tab ↗
Loads on click. Unloads only if this page sits in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads on click. Unloads only if this page sits in the background.
PCB Footprint
Open full view ↗Loads on click. Unloads only if this page sits in the background.
Datasheet
Open in new tab ↗Loads on click. Unloads only if this page sits in the background.
README
markdownLMR51430
Texas Instruments · Switching regulator (buck) · SOT-23-6
Synchronous buck converter that steps a 4 to 36 V input down to a regulated rail at up to 3 A, in a small SOT-23-6 with both MOSFETs integrated. A resistor divider at FB sets the output, EN gives an adjustable enable threshold, and a bootstrap cap at CB drives the high-side switch. The wide input and small footprint suit it to point-of-load rails off a 12 or 24 V bus. A compact, low-part-count buck for space-limited boards.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | GND | power_in | Power ground terminal. Connects to the source of the low-side FET internally. Connect to system ground and the ground side of CIN and COUT; the path to CIN must be as short as possible. |
| 2 | SW | power_out | Switching output of the converter. Connects internally to the source of the high-side FET and drain of the low-side FET. Connect this pin to the power inductor. Rated -0.3 V to 38 V DC (transient -3.0 V for < 20 ns). |
| 3 | VIN | power_in | Supply input terminal to internal bias LDO and high-side FET. Operating range 4.5 V to 36 V (abs max 38 V). Input bypass capacitors CIN must be directly connected between this pin and GND. |
| 4 | FB | input | Feedback input to the converter. Connect a resistor divider from VOUT to set the output voltage; internal reference is 0.6 V typical (0.591 V to 0.609 V). Never short this pin to ground during operation. |
| 5 | EN | input | Precision enable input. Do not float. High = on, low = off. Rising threshold ~1.227 V, falling ~1.08 V. Can be tied to VIN or used with an external divider to set adjustable UVLO. If left floating, the device is disabled. |
| 6 | CB | passive | Bootstrap capacitor connection for the high-side FET driver. Connect a high-quality 100-nF capacitor from this pin to the SW pin. CB to SW rated max 5.5 V. |
Key specifications
| Parameter | Value |
|---|---|
| Type | Synchronous step-down converter |
| Input | 4-36 V |
| Output current | 3 A |
| Integrated FETs | Yes (high + low side) |
| Control | FB divider, EN, bootstrap (CB) |
| Package | SOT-23-6 |
Ordering variants
Same part, different packaging or reel option.
LMR51430XDBVR (SOT-23-6, FPWM)LMR51430YDBVR (SOT-23-6, auto mode)
CAD (KiCad official)
- Symbol:
Regulator_Switching:LMR51430 (KiCad official) - Footprint:
Package_TO_SOT_SMD:SOT-23-6 - 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files:
lmr51430-etched.step/lmr51430-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lmr51430.step/lmr51430.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (33 pp, sha256
f7d8053844fb07ae, retrieved 2026-08-17, tier: manufacturer) - Extractor:
ds2sf(Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).