4056D from HL, in a ESOP-8. 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	TEMP	input	Battery temperature sense input. Tied to the midpoint of an external NTC/resistor divider from VCC; charging is suspended when V(TEMP) falls outside 45%VCC..80%VCC. Tie to GND to disable temperature monitoring.
2	PROG	bidirectional	Constant-current program pin and charge-current monitor. A resistor R_PROG to GND sets I_BAT = 1100 / R_PROG (A) (e.g. 1kΩ → 1000mA). Pin regulates to ~1.0V in current mode; leaving it floating puts the device into shutdown.
3	GND	power_in	Device ground reference. Also connected to the exposed thermal pad on the bottom of the ESOP-8 package for heat dissipation.
4	VCC	power_in	Positive input supply, 4.2V to 9.0V (typ. 5V, absolute max 9V). Bypass with 10µF to GND. UVLO threshold ~3.6V; VCC-adaptive circuit engages at ~4.3V to reduce charge current if the source droops.
5	BAT	power_out	Charge current output to the Li-ion battery positive terminal. Regulates to 4.2V float (±1%); delivers programmed CC current up to 1A, trickle current ~230mA below V_TRIKL (2.9V). Bypass with 10µF; reverse-battery protected (leakage <5mA).
6	STDBY	output	Open-drain charge-complete (standby) indicator, active-low. Pulled low (typ. 0.3V at 5mA) when the battery is fully charged; high-impedance otherwise. Typically drives a green LED to VCC.
7	CHRG	output	Open-drain charge-in-progress indicator, active-low. Pulled low (typ. 0.3V at 5mA) while charging; high-impedance when done or in fault. Blinks ~1-2s period to signal 'no battery' when TEMP is tied to GND.
8	CE	input	Chip enable input. Drive high to enable charging; drive low to place the device in shutdown (battery leakage <1µA, supply current <70µA). Absolute max range -0.3V to 10V.

Key specifications

Parameter	Value
Manufacturer	HL
Package	ESOP-8
Category	PMIC
Pins	8

Ordering variants

4056D

CAD (KiCad official)

Symbol: 4056D
Footprint: Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm
3D model: ESOP-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`4056d.step`	193 KB	You want the bare part, or you mark your own boards.
`4056d-etched.step`	1.1 MB	You want the part with `4056D` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 283 faces against 63 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: HL datasheet (10 pp, sha256 86254f07866bff7b, 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