TP4054

@@ -0,0 +1,40 @@+# TP4054++**UMW Youtai Semiconductor Co   Ltd** · Battery Management · SOT-23-5L++TP4054 from UMW Youtai Semiconductor Co   Ltd, in a SOT-23-5L. 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 by an internal N-channel MOSFET while charging; high-impedance when charging completes or during undervoltage lockout. Typical V(CHRG) = 0.35V at I(CHRG) = 5mA. Withstands up to V_SS + 10V. Commonly drives an LED to ground through a series resistor. |+| 2 | GND | power_in | Device ground (VSS) reference for all internal circuitry and the return for the PROG resistor. |+| 3 | BAT | power_out | Charging current output to the Li-ion cell. Regulates the battery float voltage to 4.2V (±1%) and sources the programmed charge current (up to 600mA absolute max). Under battery-reverse (V_BAT = -4V) an internal ~0.7mA current flows to GND to protect the ESD diode. Absolute max V_BAT = 7V. |+| 4 | VCC | power_in | Positive supply input, 4.25V-6.5V (absolute max V_SS + 7V). Requires at least a 1µF bypass capacitor to GND. When V(BAT) - V(VCC) drops below ~30mV the part enters shutdown and I(BAT) falls below ~2µA. |+| 5 | PROG | bidirectional | Charge-current programming, charge-current monitoring, and shutdown pin. A resistor R_PROG from PROG to GND sets I_BAT: I_BAT = (V_PROG / R_PROG) × 1000, with V_PROG ≈ 1V in constant-current mode (e.g. R_PROG = 2kΩ → ~500mA, 10kΩ → ~100mA). A 2µA pull-up allows the pin to be pulled high (>1.21V) to shut the charger down (I_CC drops to ~25µA). Absolute max V_PROG = V_SS ± 0.3V nominal / max current 800µA. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | UMW Youtai Semiconductor Co   Ltd |+| Package | SOT-23-5L |+| Category | PMIC |+| Pins | 5 |++## CAD (KiCad official)++- Symbol: `TP4054`+- Footprint: `Package_TO_SOT_SMD:SOT-23-5`+- 3D model: SOT-23-5L (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/4345650c754ecc5e3486650b41566326.pdf) (15 pp, sha256 `ead405fcfc136cf9`, 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/tp4054-datasheet.pdf)

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