TP4065-4.2V-SOT235 from TOPPOWER Nanjing Extension Microelectronics, 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	CHRG	output	Open-drain charge status output. Pulled low by the internal switch while a charge cycle is active; high-impedance otherwise. Drives an indicator LED (typ VOL = 0.7 V at 3 mA sink). Outputs a pulse (0.5-3 s period with 10 uF on BAT) when no battery is connected.
2	GND	power_in	Device ground terminal. Return for VCC, BAT and PROG.
3	BAT	power_out	Battery connection pin. Sources the charge current to the Li-ion cell and senses the final float voltage (4.2 V) via an internal resistor divider. Recommended 10 uF bypass to GND. Absolute max current 700 mA; in sleep mode the divider is disconnected and BAT draws < 1 uA.
4	VCC	power_in	Positive input supply. Operating range 4.35 V to 8 V (UVLO rising threshold typ 3.8 V). Bypass with at least 10 uF to GND. When VCC drops within 90 mV of VBAT, the part enters low-power sleep. Absolute max -6.5 V to +8 V (reverse-input protected).
5	PROG	bidirectional	Charge-current program, charge-current monitor and shutdown pin. A 1% resistor RPROG to GND sets IBAT (e.g. 2.1 kΩ -> 500 mA per IBAT = 1050/RPROG for >0.2 A). In constant-current mode PROG regulates to ~1 V; leaving PROG open lets an internal 0.2 uA pull-up drive it above the 2.7 V shutdown threshold, entering shutdown (ICC ~ 75 uA, IBAT < 1 uA). Absolute max pin current 2 mA.

Key specifications

Parameter	Value
Manufacturer	TOPPOWER Nanjing Extension Microelectronics
Package	SOT-23-5
Category	PMIC
Pins	5

Ordering variants

Same part, different packaging or reel option.

TP4065-4.2V-SOT235

CAD (KiCad official)

Symbol: TP4065-4.2V-SOT235
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`tp4065-4-2v-sot235.step`	85 KB	You want the bare part, or you mark your own boards.
`tp4065-4-2v-sot235-etched.step`	2.9 MB	You want the part with `TP4065-4.2V-SOT235` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 701 faces against 102 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: TOPPOWER Nanjing Extension Microelectronics datasheet (10 pp, sha256 65cddc07dc66125d, retrieved 2026-08-17, tier: manufacturer)
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