IP5219

@@ -0,0 +1,60 @@+# IP5219++**INJOINIC** · Battery Management · QFN-24-EP(4x4)++IP5219 from INJOINIC, in a QFN-24-EP(4x4). 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 | Battery indicator LED2 drive pin; alternate function is I2C SDA data line when I2C interface is enabled. |+| 2 | L3 | output | Battery indicator LED3 drive pin (LED SOC indicator). Datasheet text says 'Battery indicator pin2' but pin 2 is L3 in the diagram - likely a typo for pin3. |+| 3 | VREG | power_out | Internal 3.1V LDO regulator output. Provides ~3.1V rail used by internal analog blocks and the CC pull-up resistor network. |+| 4 | VTHS | input | Battery OCV (open-circuit voltage) select input - used with an external resistor to configure the battery voltage threshold. |+| 5 | RSET | input | Battery internal-resistance select input - sets the assumed battery ESR via an external resistor for SOC estimation. |+| 6 | NTC | input | Battery NTC thermistor sense input for battery temperature protection during charge/discharge. |+| 7 | AGND | power_in | Analog ground reference for internal analog blocks. Connect to the main ground plane at a single point. |+| 8 | KEY | input | Push-button key input. A short press wakes the device / turns on LED indicator; long-press toggles torch/LIGHT function. |+| 9 | BAT | power_in | Battery voltage sense and charge/discharge pin. Connects to the Li-ion cell positive terminal (charge output / boost input, VBAT 3.0-4.4V). |+| 10 | CC1 | bidirectional | USB TYPE-C CC1 configuration channel - used for DRP source/sink detection with internal Rp/Rd network. |+| 11 | CC2 | bidirectional | USB TYPE-C CC2 configuration channel - used for DRP source/sink detection with internal Rp/Rd network. |+| 12 | PGND | power_in | Power ground return for the boost/charge switching stage. Connect via a low-impedance path to the input/output caps. |+| 13 | LX | power_out | DC-DC switching node - connects to the external 1µH inductor shared by the synchronous charger and boost converter. |+| 14 | LX | power_out | DC-DC switching node (paralleled with pins 13,15) - connect to inductor. |+| 15 | LX | power_out | DC-DC switching node (paralleled with pins 13,14) - connect to inductor. |+| 16 | VOUT | power_out | DC-DC boost 5V output pin. Delivers up to 2.4A to USB-A / TYPE-C load; decouple with bulk + ceramic capacitors. |+| 17 | VOUT | power_out | DC-DC boost 5V output pin (paralleled with pin 16). |+| 18 | TC1 | output | VBUS charge-input PMOS gate control pin (channel 1) - drives external/back-to-back PMOS used for input path switching. |+| 19 | TC2 | output | VBUS charge-input PMOS gate control pin (channel 2) - drives external/back-to-back PMOS used for input path switching. |+| 20 | VIN | power_in | Charger 5V input pin (from VBUS via TYPE-C / MicroUSB). Recommended 4.75-5.5V. |+| 21 | VIN | power_in | Charger 5V input pin (paralleled with pin 20). |+| 22 | LIGHT | output | LED torch/flashlight driver - open-drain output for driving a torch LED (up to ~30 mA typ). |+| 23 | VSET | input | Battery target-voltage select input - configures target charge voltage (4.20/4.35/4.40V) via external resistor / strap. |+| 24 | L1/SCK | bidirectional | Battery indicator LED1 drive pin; alternate function is I2C SCK clock line when I2C interface is enabled (Datasheet labels this SCK though standard I2C is SCL). |+| 25 | GND | power_in | Exposed thermal pad (EPAD) - must be soldered to PCB ground plane for thermal dissipation and electrical ground. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | INJOINIC |+| Package | QFN-24-EP(4x4) |+| Category | PMIC |+| Pins | 25 |++## CAD (KiCad official)++- Symbol: `IP5219`+- Footprint: `Package_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.7x2.7mm`+- 3D model: QFN-24-EP(4x4) (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [INJOINIC datasheet](docs/ip5219-datasheet.pdf) (20 pp, sha256 `b823e8324ee2c179`, 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](docs/ip5219-datasheet.pdf)

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