component
LMR51625XFDDCR
Public Made by Adomby adom
Texas Instruments DC-DC Converters, SOT-23-6. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
Open in new tab ↗
Loads when you scroll to it. Unloads after 5 minutes in the background.
Symbol & Footprint
Schematic Symbol
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
PCB Footprint
Open full view ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Datasheet
Open in new tab ↗Loads when you scroll to it. Unloads after 5 minutes in the background.
Contents
README
markdownLMR51625XFDDCR
Texas Instruments · DC-DC Converters · SOT-23-6
LMR51625XFDDCR from Texas Instruments, in a SOT-23-6. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | FB | input | Feedback input to the converter; connect a resistor divider to set the output voltage, and never short this terminal to ground during operation. |
| 2 | EN | input | Precision enable input that must not be left floating (high = on, low = off), can be tied to VIN, and allows an adjustable UVLO through an external resistor divider. |
| 3 | VIN | power_in | Supply input to the internal bias LDO and high-side FET, connected to the input supply, with input bypass capacitors CIN placed directly between this pin and GND. |
| 4 | GND | power_in | Power ground pin connected internally to the source of the low-side FET; connect to system ground with the path to CIN kept as short as possible. |
| 5 | SW | power_out | Switching output of the converter, internally connected to the high-side FET source and low-side FET drain, which connects to the power inductor. |
| 6 | CB | passive | Bootstrap capacitor connection for the high-side FET driver; connect a high-quality 100nF capacitor from this pin to the SW pin. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOT-23-6 |
| Category | Power Management (PMIC) |
| Pins | 6 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Input voltage VIN to GND (absolute maximum) | VIN | -0.3 | 63 | V | 4 | ||
| Input voltage EN to GND (absolute maximum) | EN | -0.3 | V | Printed maximum is VIN + 0.3 V | 4 | ||
| Input voltage FB to GND (absolute maximum) | FB | -0.3 | 5.5 | V | 4 | ||
| Output voltage SW to GND (absolute maximum) | SW | -0.3 | 63 | V | 4 | ||
| Output voltage SW to GND transients (absolute maximum) | SW | -3.5 | 65 | V | less than 10ns transients | 4 | |
| Output voltage CB to SW (absolute maximum) | CB | -0.3 | 5.5 | V | 4 | ||
| Junction temperature (absolute maximum) | TJ | -40 | 150 | °C | 4 | ||
| Storage temperature (absolute maximum) | Tstg | -55 | 150 | °C | 4 | ||
| Input voltage VIN to GND (recommended) | VIN | 4.3 | 60 | V | 4 | ||
| Input voltage EN (recommended) | EN | 0 | V | Printed maximum is VIN | 4 | ||
| Input voltage FB (recommended) | FB | 0 | 4.5 | V | 4 | ||
| Output voltage VOUT (recommended) | VOUT | 0.8 | 30 | V | 4 | ||
| Output current IOUT (LM51625, 2.5A version) | IOUT | 2.5 | A | Maximum continuous DC current can be derated at high switching frequency or high ambient temperature | 4 | ||
| Operating junction temperature (recommended) | TJ | -40 | 150 | °C | 4 | ||
| VIN UVLO rising threshold | VIN_UVLO(R) | 4 | 4.25 | V | VIN rising | 5 | |
| EN voltage rising threshold | VEN(R) | 1.103 | 1.226 | 1.349 | V | EN rising, enable switching | 5 |
| EN voltage falling threshold | VEN(F) | 0.887 | 0.985 | 1.084 | V | EN falling, disable switching | 5 |
| EN pin sourcing current post EN rising threshold | IEN(P2) | 10 | 50 | nA | post EN rising threshold VEN = 3V | 5 | |
| Reference voltage | VFB | 0.792 | 0.8 | 0.808 | V | 5 | |
| Switching frequency, CCM operation, X version | fSW1(CCM) | 360 | 400 | 440 | kHz | X version, VIN = 24V | 5 |
| High-side peak current limit, 2.5A version | IHS_PK(OC) | 2.9 | 3.7 | 4.5 | A | 2.5A version | 6 |
| Low-side valley current limit, 2.5A version | ILS_V(OC) | 2.3 | 2.8 | 3.3 | A | 2.5A version | 6 |
| VIN shutdown supply current | ISD(VIN) | 2 | µA | VEN = 0V | 5 | ||
| VIN UVLO falling threshold | VIN_UVLO(F) | 3.8 | V | VIN falling | 5 | ||
| VIN UVLO hysteresis | VIN_UVLO(H) | 0.2 | V | 5 | |||
| FB input leakage current | IFB(LKG) | 0.2 | nA | VFB = 0.8V | 5 | ||
| Internal fixed soft-start time | tSS | 4 | ms | The time of internal reference to increase from 0.08V to 0.72V | 5 | ||
| High-side MOSFET on-resistance | RDSON(HS) | 85 | mΩ | ISW = -100mA | 5 | ||
| Low-side MOSFET on-resistance | RDSON(LS) | 45 | mΩ | ISW = 100mA | 6 | ||
| Minimum ON pulse width | tON-MIN | 70 | ns | VIN = 24V, IOUT = 1A | 6 | ||
| Maximum ON pulse width | tON-MAX | 5 | µs | VIN = 24V, IOUT = 1A | 6 | ||
| Minimum OFF pulse width | tOFF-MIN | 200 | ns | VIN = 24V | 6 | ||
| Low-side negative current limit, 2.5A version | ILS(NOC) | -2 | A | FPWM option, 2.5A version | 6 | ||
| Zero-cross detection current threshold | IZC | 0 | A | 6 | |||
| FB pin voltage to trip short circuit hiccup mode | VHICCUP | 0.32 | V | 6 | |||
| Time between current-limit hiccup burst | tHICCUP | 85 | ms | 6 | |||
| Thermal shutdown threshold | TJ(SD) | 165 | °C | Temperature rising | 6 | ||
| Thermal shutdown hysteresis | TJ(HYS) | 20 | °C | 6 | |||
| Junction-to-ambient thermal resistance | RθJA | 105.2 | °C/W | 5 | |||
| Junction-to-ambient thermal resistance with TI EVM | RθJA(effective) | 48.5 | °C/W | with TI EVM | 5 | ||
| Junction-to-case (top) thermal resistance | RθJC(top) | 49.8 | °C/W | 5 | |||
| Junction-to-board thermal resistance | RθJB | 24.1 | °C/W | 5 | |||
| Junction-to-top characterization parameter | ψJT | 6.2 | °C/W | 5 | |||
| Junction-to-board characterization parameter | ψJB | 23.9 | °C/W | 5 |
Materials and finish
As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).
| Part | Material | Colour / plating | Datasheet says | Page |
|---|---|---|---|---|
| contacts | copper | The SW pin connecting to the inductor must be as short as possible, and just wide enough to carry the load current without excessive heating. Short, thick traces or copper pours (shapes) must be used | 22 |
CAD (KiCad official)
- Symbol:
LMR51625XFDDCR - Footprint:
Package_TO_SOT_SMD:SOT-23-6 - 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files:
lmr51625xfddcr-etched.step/lmr51625xfddcr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lmr51625xfddcr.step/lmr51625xfddcr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (34 pp, sha256
e1f7a10d36b45dc9, retrieved 2026-10-21, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).