TP4054-42-SOT25R

@@ -0,0 +1,44 @@+# TP4054-42-SOT25R++**TOPPOWER Nanjing Extension Microelectronics** · Battery Management · SOT-23-5++TP4054-42-SOT25R 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 N-channel MOSFET during charging (strong pull-down, ~10 mA). When charging terminates, a weak ~20 uA current source pulls the pin up to indicate an 'AC present' standby state. Goes to high-impedance when the TP4054 detects an under-voltage lockout condition. |+| 2 | GND | power_in | Device ground reference. |+| 3 | BAT | power_out | Charge current output to the battery. Supplies programmable charge current (up to 800 mA) and regulates the final float voltage to 4.2 V via an internal precision resistor divider. In shutdown mode the internal divider is disconnected so the pin does not drain the battery. |+| 4 | VCC | power_in | Positive input supply voltage powering the charger. Operating range 4.0 V to 9.0 V (typ 5 V). Should be bypassed to GND with at least a 1 uF capacitor. UVLO threshold ~3.6 V. |+| 5 | PROG | bidirectional | Charge-current program, monitor and shutdown pin. A 1% resistor R_PROG from PROG to GND sets the charge current (I_BAT = 1000/R_PROG for I_BAT <= 150 mA; extended formula for higher currents). In constant-current mode the pin is regulated to ~1.0 V and mirrors 1/1000 of the charge current for monitoring. Leaving PROG floating (internal 2.5 uA pull-up drives pin above ~2.7 V) puts the chip in shutdown, reducing supply current to ~45 uA. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | TOPPOWER Nanjing Extension Microelectronics |+| Package | SOT-23-5 |+| Category | PMIC |+| Pins | 5 |++## Ordering variants++- `TP4054-42-SOT25RTP4054-42-SOT25-R`++## CAD (KiCad official)++- Symbol: `TP4054-42-SOT25R`+- 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](https://datasheet.lcsc.com/datasheet/pdf/0b076ddf91114449998aff7a9f06b7d9.pdf) (14 pp, sha256 `89bb8e97428a70bc`, 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/tp4054-42-sot25r-datasheet.pdf)

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