# IP2320

**INJOINIC** · Battery Management · ESOP-8

IP2320 from INJOINIC, in a ESOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VSYS | power_out | Boost output intermediate node; place one 22uF ceramic capacitor right next to this pin. |
| 2 | VOUT | power_out | Boost output pin connected to the battery positive terminal; absolute maximum voltage on VIN/VOUT/VSYS/BST/LX is -0.3 to 20 V. |
| 3 | VSET | input | Constant-voltage charge setting pin; an external resistor RVSET (0 to 12 kΩ) sets VTRGT = 8.05 + RVSET x 0.08 V, with RVSET 5.1 kΩ giving 8.45 V. |
| 4 | NTC | bidirectional | NTC temperature protection pin for a 10K NTC resistor; it sources 50 uA and charging stops when the pin voltage is below 0.245 V (too hot) or above 1.375 V (too cold), and it should be tied to GND through 10K if NTC is unused. |
| 5 | LED | bidirectional | Charge-status LED driver that is also multiplexed to set the constant charge current via RISET (20K: 0.6 A, 75K: 0.4 A, 200K: 0.2 A, NC: 1.0 A), with LED drive current limited to 5 mA. |
| 6 | VIN | power_in | Input supply and input-detection pin; recommended input is 4.5 V to 5.5 V (typ. 5 V), with input overvoltage protection at 5.6 to 6.0 V and absolute maximum of 20 V. |
| 7 | BST | passive | Bootstrap pin; place a 0.1uF bootstrap capacitor close to the BST and LX pins. |
| 8 | LX | output | DC-DC switching node that connects to the 2.2uH inductor; absolute maximum voltage is 20 V. |
| 9 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | INJOINIC |
| Package | ESOP-8 |
| Category | Power Management (PMIC) |
| Pins | 9 |

## CAD (KiCad official)

- Symbol: `IP2320`
- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm`
- 3D model: ESOP-8 (KiCad packages3D, STEP)
- 3D model files: `ip2320-etched.step` / `ip2320-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ip2320.step` / `ip2320.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [INJOINIC datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8590906381841354752) (11 pp, sha256 `1338e5cc51e890f9`, retrieved 2026-10-09, 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:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/ip2320-datasheet.pdf)