TP4057

@@ -0,0 +1,41 @@+# TP4057++**UMW Youtai Semiconductor Co   Ltd** · Battery Management · SOT-23-6++TP4057 from UMW Youtai Semiconductor Co   Ltd, in a SOT-23-6. Pinout and pin descriptions extracted from the datasheet (via LCSC) by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | CHRG | output | Open-drain charge status output. Pulled low while a charge cycle is in progress (V_OL ~0.35 V at 5 mA sink, 0.6 V max), high-impedance otherwise. Absolute max terminal voltage -0.3 V to 8 V. |+| 2 | GND | power_in | Device ground reference / return. Connect to system ground; also serves as the thermal reference for internal thermal regulation. |+| 3 | BAT | power_out | Battery terminal. Connects to the positive terminal of the single-cell Li-ion battery; regulates to V_FLOAT = 4.24 V (±1%) at up to 500 mA charge current. Absolute max -0.3 V to 6.5 V; max sink current 600 mA. |+| 4 | VCC | power_in | Input supply pin. Operating range 4.0 V to 6.5 V (absolute max -0.3 V to 6.5 V). Undervoltage lockout at ~3.8 V rising with ~200 mV hysteresis. Bypass with 4.7-10 µF to GND. |+| 5 | STDBY | output | Open-drain charge-complete / standby indicator. Pulled low when the charge cycle has terminated and the battery is fully charged (V_OL ~0.35 V at 5 mA sink, 0.6 V max), high-impedance otherwise. Absolute max terminal voltage -0.3 V to 8 V. |+| 6 | PROG | input | Charge current program pin. Connect a resistor R_PROG from PROG to GND to set the constant-current charge current (R_PROG=10 kΩ → 100 mA typ; R_PROG=2 kΩ → 500 mA typ). Also serves as manual shutdown when pulled above V_MSD ≈ 1.21 V open-circuit. Pin voltage in CC mode ≈ 1.0 V; internal pull-up ≈ 2 µA. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | UMW Youtai Semiconductor Co   Ltd |+| Package | SOT-23-6 |+| Category | PMIC |+| Pins | 6 |++## CAD (KiCad official)++- Symbol: `TP4057`+- Footprint: `Package_TO_SOT_SMD:SOT-23-6`+- 3D model: SOT-23-6 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [UMW Youtai Semiconductor Co   Ltd datasheet](https://datasheet.lcsc.com/datasheet/pdf/79600015110f37bfc5a6a8a637644db1.pdf) (12 pp, sha256 `3c03919324e6444e`, 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/tp4057-datasheet.pdf)

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