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LY4176ST

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by Ray

Lingyang Micro Battery Management, SOT-23-6. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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Datasheet

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Contents

README

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LY4176ST

Lingyang Micro · Battery Management · SOT-23-6

LY4176ST from Lingyang Micro, in a SOT-23-6. 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 CHRG output Open-drain charge status indicator. Pulled low to GND during charging (drives an LED); high-impedance when charging completes. Leave floating if unused. VCHRG(low) = 0.3V typ at ICHRG = 5mA.
2 GND power_in Chip ground reference.
3 BAT power_out Battery positive terminal. Delivers the charging current to the Li-ion cell; regulated to VFULL = 4.2V (or 4.1V for -41 variant). Smart-recharge threshold VFLOAT-150mV. Decouple with 1uF ceramic to GND.
4 VIN power_in Adapter power input. Absolute max 30V; OVP trips at 6.1V typ (VIN falling hysteresis 0.2V typ). UVLO 3.75V typ. Normal operating range 4.2V-5.8V. Decouple with 1uF ceramic to GND.
5 PROG input Charge current program pin. Connect a resistor to GND to set constant-current charge current: RPROG = 1000V / IC (e.g. 2K -> 500mA; max 800mA). Pin regulated to 1V in CC mode, 0.1V in trickle mode; charging terminates when VPROG falls below ~100mV (C/10).
6 NTC input Battery temperature monitor input. Voltage from an external NTC/resistor divider is compared against VNTC-H = 80%VIN and VNTC-L = 45%VIN; charging halts if VNTC is outside this window. Must be tied to GND if the temperature-monitor function is not used.

Key specifications

Parameter Value
Manufacturer Lingyang Micro
Package SOT-23-6
Category PMIC
Pins 6

Ordering variants

Same part, different packaging or reel option.

  • LY4176ST
  • LY4176ST-41

CAD (KiCad official)

  • Symbol: LY4176ST
  • Footprint: Package_TO_SOT_SMD:SOT-23-6
  • 3D model: SOT-23-6 (KiCad packages3D, STEP)

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Lingyang Micro datasheet (7 pp, sha256 90cff0530af82a22, retrieved 2026-08-17, 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: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF