component
FM4057S42
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Shenzhen Fuman Battery Management, SOT-23-6. Pinout extracted from the datasheet, KiCad symbol/footprint/3D.
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README.mdadded+58@@ -0,0 +1,58 @@+# FM4057S42++**Shenzhen Fuman** · Battery Management · SOT-23-6++FM4057S42 from Shenzhen Fuman, in a SOT-23-6. 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 | Charge-in-progress status output. Open-drain LED driver: sinks current (LED on) while charging is active, high-Z (LED off) when charging completes. Connect an external LED with series resistor to VIN. |+| 2 | GND | power_in | Device ground reference. |+| 3 | BAT | power_out | Battery output terminal. Connects to the positive terminal of the single-cell Li-ion battery. Regulated to 4.2V for the '42' variant. Absolute max 6V; recommended 10 µF bulk cap to GND. |+| 4 | VIN | power_in | Charger input supply. Recommended 4.2 V-6.5 V (typ 5V from AC adapter or USB); absolute maximum 32V. Input OVP trips at 6.5V for the standard FM4057; 1 µF decoupling to GND recommended. |+| 5 | DONE | output | Charge-complete status output. Open-drain LED driver: high-Z (LED off) while charging, sinks current (LED on) once the battery is fully charged. Connect an external LED with series resistor to VIN. |+| 6 | ISET | input | Charge-current programming pin. Connect a resistor from ISET to GND to set the constant-current charge level (up to 1A). Also participates in thermal regulation feedback. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Shenzhen Fuman |+| Package | SOT-23-6 |+| Category | PMIC |+| Pins | 6 |++## Ordering variants++- `FM4057S42`+- `FM4057S42FM4057S43`+- `FM4057S42FM4057S44`+- `FM4057S42FM4057S52`+- `FM4057S42FM4057BS52`+- `FM4057S42FM4057S53`+- `FM4057S42FM4057S54`+- `FM4057S42FM4057E42`+- `FM4057S42FM4057BE42`+- `FM4057S42FM4057E43`+- `FM4057S42FM4057E44`+- `FM4057S42FM4057D42`+- `FM4057S42FM4057D43`+- `FM4057S42FM4057D44`++## CAD (KiCad official)++- Symbol: `FM4057S42`+- 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:** [Shenzhen Fuman datasheet](docs/fm4057s42-datasheet.pdf) (14 pp, sha256 `bfc23830eabbc3b5`, 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/fm4057s42-datasheet.pdf)
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