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pj4055a20sg

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

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PJ4055A20SG

PJSEMI · Battery Management · SOT-23-6

PJ4055A20SG from PJSEMI, 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 output. Strong pull-down (bright) when a charge cycle is in progress; high-impedance when charge complete. Flashes if no battery is present. Weak pull-down current ICHRG ≈ 3 mA. Typically drives an LED with a 1 kΩ series resistor to VCC.
2 GND power_in Ground pin. Also serves as the primary thermal path from the die/lead-frame to the PC board copper heatsink for thermal regulation.
3 BAT power_out Charging current output to the Li-Ion battery. Regulated float voltage 4.20V (A20 variant, ±0.6%). Delivers up to 600 mA (programmed via PROG). Recharge threshold ~4.1V; trickle-charge threshold 2.9V. Absolute maximum -4.5 to +5.5 V. Requires a 1 µF decoupling capacitor to GND.
4 VCC power_in Positive input supply voltage. Operating range 4.5 V to 6.2 V (typ. 5 V, USB-compatible); 6.2 V input OVP; absolute maximum 12 V. Input supply current ICC ≈ 150 µA. Requires a 1 µF decoupling capacitor to GND.
5 STANDBY output Open-drain charge-complete status output. High-impedance during charging; changes to strong pull-down state once the charge cycle terminates (battery full). Typically drives an LED with a 1 kΩ series resistor to VCC.
6 PROG bidirectional Charge-current program, charge-current monitor, and shutdown pin. Connect a resistor RPROG from PROG to GND; charge current IBAT = (VPROG/RPROG)×1000, where VPROG ≈ 1.0 V. Example: RPROG = 2 kΩ → 500 mA; RPROG = 10 kΩ → 100 mA. Charge terminates when VPROG falls below 100 mV (C/10). Absolute max VPROG -0.3 to 8.5 V. Floating/open the pin to shut down.

Key specifications

Parameter Value
Manufacturer PJSEMI
Package SOT-23-6
Category PMIC
Pins 6

Ordering variants

  • PJ4055A20SG
  • PJ4055A20SGPJ4055A15SG
  • PJ4055A20SGPJ4055A25SG
  • PJ4055A20SGPJ4055A30SG
  • PJ4055A20SGPJ4055A35SG

CAD (KiCad official)

  • Symbol: PJ4055A20SG
  • Footprint: Package_TO_SOT_SMD:SOT-23-6
  • 3D model: SOT-23-6 (KiCad packages3D, STEP)
  • 3D model files: pj4055a20sg-etched.step / pj4055a20sg-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); pj4055a20sg.step / pj4055a20sg.glb are the bare package body.

Provenance

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

  • Datasheet: PJSEMI datasheet (None pp, sha256 392cd2125be4fe22, retrieved 2026-08-17, tier: lcsc)
  • 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

Symbol & Footprint

Schematic Symbol

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PCB Footprint

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Datasheet

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