component
LM5155DSSR
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
markdownLM5155DSSR
Texas Instruments · DC-DC Converters · WSON-12-EP(2x3)
LM5155DSSR 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 | Power voltage input for VCC regulator with bypass capacitor to PGND, operating range 3.5V to 45V. |
| 2 | VCC | power_out | Regulated 6.85V output from internal VCC regulator powering MOSFET driver with ceramic bypass capacitor to PGND. |
| 3 | GATE | output | N-channel MOSFET gate drive output with 1.5A peak current capacity, connect directly to gate through short, low-inductance path. |
| 4 | PGND | power_in | Power ground pin connected through wide, short, low-inductance path directly to current sense resistor ground. |
| 5 | CS | input | Current sense input pin for peak current mode control at -0.3V to +0.3V DC range, connect to positive side of sense resistor. |
| 6 | COMP | output | Transconductance error amplifier output with 10MΩ output impedance and 2.5V to 2.8V clamp voltage, connect loop compensation to PGND. |
| 7 | AGND | power_in | Analog ground pin connected through wide, short path to analog ground plane. |
| 8 | FB | input | Error amplifier inverting input with 1V internal reference and 3.8V absolute maximum, voltage divider from output sets boost/SEPIC regulation with low-side resistor to AGND. |
| 9 | SS | input | Soft-start programming pin with internal 10µA current source charging external capacitor to set error amplifier reference ramp rate, capacitor ground to AGND. |
| 10 | RT | input | Switching frequency programming pin using single resistor between RT and AGND to set 100kHz to 2.2MHz operating frequency. |
| 11 | PGOOD | output | Open-drain power good indicator pulling low when FB falls below 90% VREF undervoltage threshold, requires pull-up resistor to system voltage rail. |
| 12 | UVLO/EN/SYNC | input | Undervoltage lockout and synchronization input programmed via resistor divider to supply voltage for startup/shutdown threshold or synchronized to external clock via negative pulses, must not float and connect to BIAS when unused. |
| 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:
LM5155DSSR - 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:
lm5155dssr-etched.step/lm5155dssr-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lm5155dssr.step/lm5155dssr.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Texas Instruments datasheet (47 pp, sha256
bd3a89d2b1c0634e, 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 0.2, 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).