component

LGS7381

Public Made by Adom

by adom

Legend Si Battery Management, SOT-23-5. Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.

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Generated by kicad-footprint-generator · KiCad file format 20260206
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docs lgs7381: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
viewers lgs7381: viewers · Ray 1mo ago
lgs7381-etched.fit.json lgs7381: re-etch, flat white mark read from pin 1 (service-occt 1.4.0) + chip hero · Ray 1mo ago
lgs7381-etched.glb lgs7381: white body in tscircuit (pre-1.8 etch structure under an assembly instance); Ray 2026-10-19: black IC body wit… · Ray 12d ago
lgs7381-etched.step lgs7381: white body in tscircuit (pre-1.8 etch structure under an assembly instance); Ray 2026-10-19: black IC body wit… · Ray 12d ago
lgs7381.glb Publish 0.1.0 · Ray 1mo ago
lgs7381.kicad_mod Publish 0.1.0 · Ray 1mo ago
lgs7381.kicad_sym Publish 0.1.0 · Ray 1mo ago
lgs7381.lbr Publish 0.1.0 · Ray 1mo ago
lgs7381.step Publish 0.1.0 · Ray 1mo ago
package.json lgs7381: white body in tscircuit (pre-1.8 etch structure under an assembly instance); Ray 2026-10-19: black IC body wit… · Ray 12d ago
page.json lgs7381: white body in tscircuit (pre-1.8 etch structure under an assembly instance); Ray 2026-10-19: black IC body wit… · Ray 12d ago
README.md Initial commit: component/lgs7381 · Ray 1mo ago

LGS7381

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.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); lgs7381.step / lgs7381.glb are 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, primary claude-haiku-4-5-20251001 (text), consensus claude-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).

Datasheet PDF