IP2312-4V35

@@ -0,0 +1,49 @@+# IP2312-4V35++**INJOINIC** · DC-DC Converters · ESOP-8++IP2312-4V35 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 | D1 | output | LED drive pin / battery-type select pin (IP2312_VSET). Drives an LED indicator (3-10 mA) and, on VSET variants, sets the target charge voltage via an external pull-down resistor (NC=4.2V, 43k=4.3V, 75k=4.35V, 100k=4.4V). |+| 2 | TEST | passive | Test pin. Connect through a 1kΩ resistor to the battery positive terminal (VBAT). |+| 3 | D2 | output | LED drive pin. Drives the second (charge-complete) status LED at 3-10 mA typical. |+| 4 | NTC | input | NTC temperature-protection input. Sources 20 μA out to an external NTC thermistor to ground; internal comparators trip at VH=0.56V (over-temp), VM=0.60V (warn, reduces current by half), and VL=1.32V (under-temp). Connect a 51kΩ resistor to GND if unused (do not float). |+| 5 | BAT | power_out | Battery positive-terminal connection. Buck-converter output to the Li-ion cell; charge termination voltage 4.35V (-4V35 variant), up to 3A charge current. Absolute max 6.5V (9V for <10 μs). |+| 6 | ICHG | passive | Charge-current setting pin. External resistor RICHG to GND programs the constant-current charge level: ICC = 135000 / RICHG (e.g. 135kΩ→1A, 91kΩ→1.5A, 45kΩ→3A). Max useful RICHG = 170kΩ; leaving NC defaults to 2.1A. |+| 7 | SW | output | DC-DC switching node. Connects to the external buck inductor (typ. 1 μH). Absolute max 6.5V (9V for <10 μs) with integrated PMOS (35 mΩ) and NMOS (30 mΩ) power switches operating at 750 kHz. |+| 8 | VIN | power_in | 5V charge input from adapter/USB. Recommended 4.5-5.5V, absolute max 6.5V (9V for <10 μs). Integrated UVLO at 4.5V and OVP at 5.6V; input current auto-adjusts to keep adapter from collapsing. |+| 9 | EPAD | power_in | Exposed thermal pad on package underside. Ground (GND) connection; must be soldered to the PCB ground plane for thermal dissipation (θJA = 60 °C/W). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | INJOINIC |+| Package | ESOP-8 |+| Category | PMIC |+| Pins | 9 |++## Ordering variants++- `IP2312-4V354V35`++## CAD (KiCad official)++- Symbol: `IP2312-4V35`+- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm`+- 3D model: ESOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [INJOINIC datasheet](docs/ip2312-4v35-datasheet.pdf) (11 pp, sha256 `37609e8a8c4601a0`, 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](docs/ip2312-4v35-datasheet.pdf)

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