IP5209T

@@ -0,0 +1,65 @@+# IP5209T++**INJOINIC** · Battery Management · QFN-24-EP(4x4)++IP5209T 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-level LED driver pin L2; also acts as the I2C SDA data line when I2C function is enabled. |+| 2 | L3 | output | Battery-level indicator LED driver pin L3. Drives the 3rd LED in multi-LED fuel-gauge display modes. |+| 3 | VREG | power_out | Internal 3.1V LDO regulator output. Sourcing capability ~5 mA; no output in sleep state. Used as internal supply and reference; also selects VTHS high-platform battery voltage when tied to VTHS. |+| 4 | VTHS | input | Battery platform-select input. Tie to VREG for high-platform 3.7V battery; tie to GND for low-platform 3.6V battery. |+| 5 | RSET | input | Battery internal-resistance compensation setting via external resistor to GND. Tunes fuel-gauge curve (e.g. 10K=45mΩ, 43K=67.5mΩ, 120K=112.5mΩ, 200K=90mΩ, NC=22.5mΩ). |+| 6 | NTC | input | Battery temperature sense input for external NTC thermistor. Sources 20 µA; thresholds VH=0.43V (>55°C), VM=0.58V (>45°C, half charge current), VL=1.44V (<-10°C, stop charge/discharge). Tie to GND if unused. |+| 7 | AGND | power_in | Analog ground reference for the control/analog blocks. |+| 8 | KEY | input | Push-button input to GND. Short press (60ms-2s) enables battery-display LED and 5V boost output; long press (>2s) toggles flashlight LED; double-tap within 1s turns off boost, LED display and flashlight. |+| 9 | VBAT | power_in | Boost converter input; connect to Li-ion battery positive terminal. Operating range 3.0-4.4V. |+| 10 | NC | unconnected | No connect. Leave floating. |+| 11 | ICHG | input | Charge current program pin. External resistor to GND sets charge current per ICHG = 1.2V/R × 10000 (e.g. 120K=1A, 100K=1.2A, 82K=1.5A, 51K=2.4A, NC=default 1.9A). |+| 12 | PGND | power_in | Power ground for the switching power stage. |+| 13 | LX | passive | DCDC switching node. Connect to external boost inductor (typ. 1 µH). Pins 13, 14, 15 are tied together internally. |+| 14 | LX | passive | DCDC switching node. Connect to external boost inductor (typ. 1 µH). Tied to pins 13, 15. |+| 15 | LX | passive | DCDC switching node. Connect to external boost inductor (typ. 1 µH). Tied to pins 13, 14. |+| 16 | VOUT | power_out | 5V boost regulated output (2.4A max). Delivers USB-out supply. Pins 16, 17 tied together internally. |+| 17 | VOUT | power_out | 5V boost regulated output (2.4A max). Tied to pin 16. |+| 18 | DM | bidirectional | USB D− line for DCP handshake / attached-device detection. Supports Apple, Samsung and BC1.2 DCP D+/D− voltage patterns for max charging current. |+| 19 | DP | bidirectional | USB D+ line for DCP handshake / attached-device detection. Works with DM to advertise BC1.2 / Apple / Samsung DCP profiles. |+| 20 | VIN | power_in | DC 5V charge input (from USB Micro-B / Type-A adapter). Operating range 4.75-5.5V; UVLO 4.5V rising, 200 mV hysteresis. Pins 20, 21 tied together internally. |+| 21 | VIN | power_in | DC 5V charge input. Tied to pin 20. |+| 22 | LIGHT | output | Flashlight LED driver output, open-drain, drives external LED up to 100 mA. Toggled by KEY long-press. Tie to GND if flashlight unused so IC auto-disables the feature. |+| 23 | VSET | input | Battery type/voltage select. Float → 4.2V battery; tie to GND → 4.35V battery; tie to VBAT → 4.4V battery. |+| 24 | L1/SCK | bidirectional | Battery-level LED driver pin L1; also acts as the I2C SCK clock line when I2C function is enabled. |+| 25 | GND | power_in | Exposed thermal pad (EPAD). Power ground and heat-sink; must be soldered to PCB ground for proper thermal and electrical operation. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | INJOINIC |+| Package | QFN-24-EP(4x4) |+| Category | PMIC |+| Pins | 25 |++## Ordering variants++- `IP5209T`++## CAD (KiCad official)++- Symbol: `IP5209T`+- 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/ip5209t-datasheet.pdf) (14 pp, sha256 `5ffc084f061c59e6`, 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/ip5209t-datasheet.pdf)

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