component
LGS7381
Public Made by Adomby adom
Legend Si Battery Management, SOT-23-5. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownLGS7381
Legend Si · Battery Management · SOT-23-5
LGS7381 from Legend Si, in a SOT-23-5. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | CE | input | Enable input pin; high level enables charging, low level disables charging; connect to VCC or MCU control. |
| 2 | GND | power_in | Chip ground reference. |
| 3 | BAT | output | Battery charging output pin; connect to battery positive terminal with at least 10μF ceramic capacitor to ground. |
| 4 | VCC | power_in | Power supply input pin with recommended operating voltage 4.5V to 6V; bypass to ground with at least 10μF ceramic capacitor placed close to pin. |
| 5 | PROG | output | Charging current setting and monitoring output pin; pin voltage fixed at 0.05V (SC), 0.1V (TC), or 1V (CC) depending on charging mode; external 1% resistor to ground sets current via IBAT = (VPROG / RPROG) × 1000. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Legend Si |
| Package | SOT-23-5 |
| Category | Power Management (PMIC) |
| Pins | 5 |
CAD (KiCad official)
- Symbol:
LGS7381 - Footprint:
Package_TO_SOT_SMD:SOT-23-5 - 3D model: SOT-23-5 (KiCad packages3D, STEP)
- 3D model files:
lgs7381-etched.step/lgs7381-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);lgs7381.step/lgs7381.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Legend Si datasheet (11 pp, sha256
630ea8fc9f8f8ca1, retrieved 2026-09-22, 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-4-6(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).