WS4054

@@ -0,0 +1,46 @@+# WS4054++**WPMtek Wei Pan Microelectronics** · Battery Management · SOT-23-5L++WS4054 from WPMtek Wei Pan Microelectronics, in a SOT-23-5L. 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 indicator. Pulled low (LED on) during an active charge cycle; high-Z (LED off) when charging terminates, VDD is in UVLO, or VBAT > VDD. Blinks when VDD is valid, BAT is connected only to a ~2.2 uF capacitor and no battery is present. VCHRGL ≤ 100 mV at ICHRG = 5 mA. Tie to ground through a series LED + ~1 kΩ resistor from VIN, or leave unconnected if unused. |+| 2 | GND | power_in | Device ground reference. Connect to system ground with a low-impedance path; PROG resistor and input/output bypass capacitors return here. |+| 3 | BAT | power_out | Charge current output to the single-cell Li-ion battery. Regulates to VFLOAT = 4.200 V ±42 mV in constant-voltage mode. Sources programmed constant current (up to 500 mA) in CC mode and ~1/10 of the programmed current as trickle when VBAT < VTRKL (2.9 V). Recharge cycle restarts when VBAT falls ~150 mV below VFLOAT (≈ 4.05 V). Bypass with ~1-10 uF ceramic capacitor to GND. |+| 4 | VDD | power_in | Input supply from USB port or AC adapter. Recommended operating range 4.5 V-6.0 V (absolute max 9 V, but reverse-connected-battery operation should stay near 5 V and not exceed 6 V). UVLO threshold typ 3.7 V rising with 170 mV hysteresis; charger stays disabled until VDD > VBAT + 200 mV. Bypass with 1-10 uF ceramic capacitor to GND close to the pin. |+| 5 | PROG | passive | Charge-current program pin. Connect a resistor RPROG from PROG to GND to set the fast-charge current: IBAT ≈ 1000 / RPROG (A·Ω), e.g. 2 kΩ → 500 mA, 4 kΩ → 250 mA, 10 kΩ → 100 mA, 20 kΩ → 50 mA. Servos to VPROG2 ≈ 1.00 V in constant-current mode. Floating or open PROG puts the part into standby; termination is detected when the PROG voltage falls below 100 mV for TDELAY. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | WPMtek Wei Pan Microelectronics |+| Package | SOT-23-5L |+| Category | PMIC |+| Pins | 5 |++## Ordering variants++Same part, different packaging or reel option.++- `WS4054`++## CAD (KiCad official)++- Symbol: `WS4054`+- 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:** [WPMtek Wei Pan Microelectronics datasheet](docs/ws4054-datasheet.pdf) (8 pp, sha256 `92880727123ac84b`, 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/ws4054-datasheet.pdf)

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