TP4055

@@ -0,0 +1,44 @@+# TP4055++**TOPPOWER Nanjing Extension Microelectronics** · Battery Management · SOT-23-5++TP4055 from TOPPOWER Nanjing Extension Microelectronics, in a SOT-23-5. 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 | CHRG | output | Open-drain charge status output. Pulled low by an internal switch while charging is in progress; high-impedance otherwise. Outputs a ~0.5-2 s pulse (with 10 uF at BAT) when no battery is connected. |+| 2 | GND | power_in | Ground terminal / device reference. |+| 3 | BAT | power_out | Battery connection pin. Supplies charge current to the Li-ion cell and regulates the final float voltage to 4.2 V via an internal precision divider (disconnected in shutdown). Bypass with 10 uF; absolute current 500 mA. |+| 4 | VCC | power_in | Positive input supply, 4 V to 9 V (abs max -0.3 V to 9 V). Bypass with at least 10 uF. When VCC drops within 30 mV of VBAT the part enters low-power sleep (IBAT < 1 uA). |+| 5 | PROG | bidirectional | Charge-current program, monitor, and shutdown pin. A 1% resistor RPROG to GND sets IBAT (e.g. 1.66 kOhm -> 500 mA); pin sits at 1 V in constant-current mode. Leaving RPROG open lets an internal 2.5 uA source pull the pin above the 2.7 V shutdown threshold, stopping charge and reducing supply current to ~40 uA. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | TOPPOWER Nanjing Extension Microelectronics |+| Package | SOT-23-5 |+| Category | PMIC |+| Pins | 5 |++## Ordering variants++- `TP4055-42-SOT235`++## CAD (KiCad official)++- Symbol: `TP4055`+- Footprint: `Package_TO_SOT_SMD:SOT-23-5`+- 3D model: SOT-23-5 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [TOPPOWER Nanjing Extension Microelectronics datasheet](docs/tp4055-datasheet.pdf) (9 pp, sha256 `051a3c3b2441467b`, retrieved 2026-08-17, tier: manufacturer)+- **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/tp4055-datasheet.pdf)

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