IP5310 from INJOINIC, in a QFN-32-EP(5x5). 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	L2/SDA	bidirectional	Fuel-gauge LED drive pin L2. Doubles as I2C SDA on the I2C-enabled variant (IP5310_I2C).
2	L3/MCU_WAKE	bidirectional	Fuel-gauge LED drive pin L3. On the I2C variant this pin serves as an MCU wake output.
3	VSET	input	Battery type / charge-termination voltage select. Float = 4.20V CV, GND = 4.35V CV, tie to VBAT = 4.40V CV.
4	VTHS	input	Battery platform / discharge cut-off voltage select input.
5	RSET	input	Battery internal-resistance compensation input; sets fine-trim on the fuel-gauge curve via an external resistor.
6	NTC	input	Battery-pack NTC thermistor sense input for temperature protection during charge/discharge.
7	AGND	power_in	Analog ground reference for the internal analog blocks. Connect to system ground plane.
8	KEY	input	User push-button input. Short press wakes the SoC / toggles the LED fuel gauge; long press turns the power bank on/off; double-press toggles the flashlight.
9	BAT	power_in	Single-cell Li-ion battery connection. Charge input from and boost supply to the battery (2.9V-4.4V operating).
10	VBUS	power_in	VBUS charging-input voltage detect pin (5V nominal from TYPE-C or Micro-B host).
11	VBUSG	output	Gate-drive output for the external VBUS-input PMOS (input path isolation FET).
12	CC1	bidirectional	USB TYPE-C Configuration Channel 1. Drives Rp (33k/11k/4.2k for default/1.5A/3.0A) as source or Rd (5.1k) as sink; supports Try.SRC DRP operation.
13	CC2	bidirectional	USB TYPE-C Configuration Channel 2. Mirrors CC1 for orientation detection in the DRP state machine.
14	LX	power_out	DC-DC switching node. Pins 14-18 are paralleled and connect to the external 1µH power inductor (fs = 375kHz discharge / 500kHz charge).
15	LX	power_out	DC-DC switching node (paralleled with pins 14, 16, 17, 18 to the inductor).
16	LX	power_out	DC-DC switching node (paralleled).
17	LX	power_out	DC-DC switching node (paralleled).
18	LX	power_out	DC-DC switching node (paralleled).
19	VOUT	power_out	5V boost output / TYPE-A discharge rail. Pins 19-22 are paralleled; supplies up to 3.1A continuous.
20	VOUT	power_out	5V output (paralleled with 19, 21, 22).
21	VOUT	power_out	5V output (paralleled).
22	VOUT	power_out	5V output (paralleled).
23	VIN	power_in	5V charge-input pin (Micro-B side). Pins 23-24 are paralleled; operating range 4.65-5.5V, absolute max 6.0V.
24	VIN	power_in	5V charge-input pin (paralleled with pin 23).
25	DMC	output	DCP D1- output - TYPE-C port BC1.2 dedicated charging port D- line.
26	DPC	output	DCP D1+ output - TYPE-C port BC1.2 dedicated charging port D+ line.
27	DMA	output	DCP D0- output - TYPE-A port BC1.2 D- line.
28	DPA	output	DCP D0+ output - TYPE-A port BC1.2 D+ line.
29	DMB	unconnected	NC - leave floating.
30	DPB	unconnected	NC - leave floating.
31	LIGHT	output	Flashlight LED driver output. Open-drain sink (typ. 30 mA), enabled via a double-press of the KEY pin.
32	L1/SCK	bidirectional	Fuel-gauge LED drive pin L1. Doubles as I2C SCK on the IP5310_I2C variant.
33	EPAD	power_in	Exposed thermal / power ground pad on the QFN underside. Must be soldered to the PCB ground plane for adequate thermal and electrical performance.

Key specifications

Parameter	Value
Manufacturer	INJOINIC
Package	QFN-32-EP(5x5)
Category	PMIC
Pins	33

Ordering variants

Same part, different packaging or reel option.

IP5310
IP5310_I2C

CAD (KiCad official)

Symbol: IP5310
Footprint: Package_DFN_QFN:QFN-32-1EP_5x5mm_P0.5mm_EP3.3x3.3mm
3D model: QFN-32-EP(5x5) (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`ip5310.step`	346 KB	You want the bare part, or you mark your own boards.
`ip5310-etched.step`	1.8 MB	You want the part with `IP5310` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 457 faces against 206 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 (22 pp, sha256 fc20ac3b8e5de0e7, 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