TP4054 from UMW, in a SOT-23-5L. Pinout and pin descriptions extracted from the 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 N-channel MOSFET while charging; high-impedance when charging completes or during undervoltage lockout. Typical V(CHRG) = 0.35V at I(CHRG) = 5mA. Withstands up to V_SS + 10V. Commonly drives an LED to ground through a series resistor.
2	GND	power_in	Device ground (VSS) reference for all internal circuitry and the return for the PROG resistor.
3	BAT	power_out	Charging current output to the Li-ion cell. Regulates the battery float voltage to 4.2V (±1%) and sources the programmed charge current (up to 600mA absolute max). Under battery-reverse (V_BAT = -4V) an internal ~0.7mA current flows to GND to protect the ESD diode. Absolute max V_BAT = 7V.
4	VCC	power_in	Positive supply input, 4.25V-6.5V (absolute max V_SS + 7V). Requires at least a 1µF bypass capacitor to GND. When V(BAT) - V(VCC) drops below ~30mV the part enters shutdown and I(BAT) falls below ~2µA.
5	PROG	bidirectional	Charge-current programming, charge-current monitoring, and shutdown pin. A resistor R_PROG from PROG to GND sets I_BAT: I_BAT = (V_PROG / R_PROG) × 1000, with V_PROG ≈ 1V in constant-current mode (e.g. R_PROG = 2kΩ → ~500mA, 10kΩ → ~100mA). A 2µA pull-up allows the pin to be pulled high (>1.21V) to shut the charger down (I_CC drops to ~25µA). Absolute max V_PROG = V_SS ± 0.3V nominal / max current 800µA.

Key specifications

Parameter	Value
Manufacturer	UMW
Package	SOT-23-5L
Category	PMIC
Pins	5

CAD (KiCad official)

Symbol: TP4054
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5L (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`tp4054.step`	85 KB	You want the bare part, or you mark your own boards.
`tp4054-etched.step`	1.2 MB	You want the part with `TP4054` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 307 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: UMW datasheet (15 pp, sha256 ead405fcfc136cf9, 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