component
LM51551QDSSTQ1
Public Made by Adomby adom
Texas Instruments DC-DC Converters, WSON-12-EP(2x3). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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
markdownLM51551QDSSTQ1
Texas Instruments · DC-DC Converters · WSON-12-EP(2x3)
LM51551QDSSTQ1 from Texas Instruments, in a WSON-12-EP(2x3). 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 | BIAS | power_in | VCC regulator power supply voltage input (3.5V to 45V); connect bypass capacitor between this pin and PGND. |
| 2 | VCC | power_out | Internal VCC regulator output and MOSFET driver power supply voltage (6.85V typical); connect ceramic bypass capacitor to PGND. |
| 3 | GATE | output | N-channel MOSFET gate drive output (1.5A peak); connect via short low-inductance path directly to MOSFET gate. |
| 4 | PGND | power_in | Power ground pin; connect via wide short low-inductance path to current sense resistor ground connection. |
| 5 | CS | input | Current sense input pin; connect via short path to positive side of current sense resistor (100mV ±7% threshold). |
| 6 | COMP | output | Internal transconductance error amplifier output; connect loop compensation network (RCOMP, CCOMP) between this pin and PGND. |
| 7 | AGND | power_in | Analog ground pin; connect via wide short path to analog ground plane layer. |
| 8 | FB | input | Error amplifier inverting input; connect voltage divider from output to set 1.0V ±1% target voltage in boost/SEPIC topologies. |
| 9 | SS | input | Soft-start time programming pin; external capacitor and internal 10µA current source set soft-start ramp rate, ground to AGND. |
| 10 | RT | input | Switching frequency setting pin; program switching frequency from 100kHz to 2.2MHz via resistor between RT and AGND. |
| 11 | PGOOD | output | Power good indicator open-drain output; pulls low when FB below 87-93% of VREF, pull up to system voltage (max 1mA sink). |
| 12 | UVLO/SYNC | input | Undervoltage lockout and external clock sync input; connect via resistor divider to set startup/shutdown thresholds or apply sync pulses. |
| 13 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | WSON-12-EP(2x3) |
| Category | Power Management (PMIC) |
| Pins | 13 |
CAD (KiCad official)
- Symbol:
LM51551QDSSTQ1 - Footprint:
Package_SON:WSON-12-1EP_3x2mm_P0.5mm_EP1x2.65 - 3D model: WSON-12-EP(2x3), generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.75 mm nominal WSON height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files:
lm51551qdsstq1-etched.step/lm51551qdsstq1-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm51551qdsstq1.step/lm51551qdsstq1.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (50 pp, sha256
a8503f9fa4bec785, retrieved 2026-10-01, tier: lcsc) - Datasheet language: Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-4-5-20251001(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).