AD4057 from IDCHIP, 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. Pulled low by an internal switch while charging is in progress; otherwise high-impedance. Typically drives an external LED (with a series resistor to VCC).
2	GND	power_in	Device ground / power return.
3	BAT	power_out	Charge current output to the single-cell Li-ion battery. An internal precision resistor divider regulates the final float voltage to 4.2 V (±1%). The divider is disconnected in shutdown mode, reducing battery drain to <2 uA. Supplies up to 600 mA charge current.
4	VCC	power_in	Input supply for the charger. Operating range 4.25 V to 6.5 V (abs max 4.2-5.5 V range noted; recommended VCC = 4.5-6.0 V). Should be bypassed with at least a 1 uF capacitor. When VCC falls to within 30 mV of VBAT, the part enters shutdown and IBAT drops below 2 uA.
5	STDBY	output	Open-drain charge-complete indicator. Pulled low by an internal switch when the charge cycle terminates (C/10); otherwise high-impedance. Typically drives an external LED.
6	PROG	bidirectional	Charge-current program, monitor, and shutdown pin. A 1% resistor RPROG from PROG to GND sets the fast-charge current: IBAT = (VPROG / RPROG) * 1000, with VPROG = 1.0 V typ in constant-current mode. The pin voltage also serves as an analog current-monitor readout. Floating RPROG (open) allows an internal 2.5 uA pull-up to raise PROG past the 1.22 V shutdown threshold, entering shutdown (ICC ≈ 45 uA); reconnecting RPROG resumes normal operation.

Key specifications

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

Ordering variants

AD4057

CAD (KiCad official)

Symbol: AD4057
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-23-6 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`ad4057.step`	97 KB	You want the bare part, or you mark your own boards.
`ad4057-etched.step`	1.2 MB	You want the part with `AD4057` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 313 faces against 117 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

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

Datasheet: IDCHIP datasheet (6 pp, sha256 c1f596377f986ede, 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