IP5306 from INJOINIC, 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	VIN	power_in	Charger 5V input pin. Recommended input voltage 4.75-5.5V (typ 5V). Input under-voltage lockout rising threshold ~4.5V with 200mV hysteresis. Provides adapter power to the internal synchronous buck charger.
2	LED1	output	Battery state-of-charge (SOC) LED indicator pin 1. Sinks/sources ~4 mA to drive an indicator LED. Multiplexed with the L1 line used in 1/2/3/4-LED configurations to display SOC and charging status.
3	LED2	output	Battery SOC LED indicator pin 2 (~4 mA drive). Together with LED1/LED3 it forms the 3-pin matrix that drives up to 4 SOC LEDs.
4	LED3	output	Battery SOC LED indicator pin 3 (~4 mA drive). Third line of the matrixed LED indicator; unused/tied to BAT in some LED-count configurations.
5	KEY	input	ON/OFF push-button input, also multiplexed as torch/flashlight lighting driver. Short push (30 ms - 2 s) turns on SOC LEDs and enables the boost; long push (>2 s) turns everything off; double short-push toggles the flashlight LED.
6	BAT	power_in	Battery voltage sense pin and battery connection for the switching charger/boost. Operating range 3.0-4.4V (typ 3.7V Li-ion). Target charge voltage 4.2V (4.20/4.30/4.35/4.40V options), recharge threshold 4.1V.
7	SW	passive	DC-DC switch node; connect the single power inductor (typ 1 uH) between SW and BAT. Carries the synchronous buck/boost switching waveform (500 kHz typical) and up to 2.1 A load current.
8	VOUT	power_out	DC-DC 5V output pin (boost output, typ 5.10 V from VBAT=3.7V) delivering up to 2.1 A. Also serves as the USB Vbus output; supports output over-current and short-circuit protection.
9	PowerPAD	power_in	Exposed thermal pad on the underside of the eSOP-8 package. Must be connected to the ground plane; serves as the device ground return and primary thermal path for the integrated power FETs.

Key specifications

Parameter	Value
Manufacturer	INJOINIC
Package	ESOP-8
Category	PMIC
Pins	9

CAD (KiCad official)

Symbol: IP5306
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
`ip5306.step`	193 KB	You want the bare part, or you mark your own boards.
`ip5306-etched.step`	1.4 MB	You want the part with `IP5306` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 343 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: INJOINIC datasheet (11 pp, sha256 76818e77bf2002bf, 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