FM4057E42

@@ -0,0 +1,62 @@+# FM4057E42++**Shenzhen Fuman** · Battery Management · ESOP-8++FM4057E42 from Shenzhen Fuman, in a ESOP-8. 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 | NC | unconnected | No internal connection. Leave floating or tie to GND. |+| 2 | ISET | input | Charge-current programming input. An external resistor from ISET to GND sets the constant-current charge level (typ. 1.0A at 3kΩ, 0.6A at 5kΩ, 0.5A at 6kΩ). Also sets precharge (~60mA at 5kΩ) and termination (~60mA at 5kΩ) thresholds. |+| 3 | GND | power_in | Device ground / analog reference for VIN, BAT, ISET, and the LED status outputs. |+| 4 | VIN | power_in | Charger input supply. Recommended operating range 4.2V-6.5V (typ. 5V); withstands up to 32V. Internal VIN OVP trips at 6.5V (0.5V hysteresis) and UVLO at 4.6V rising / 4.2V falling. Bypass with ≥4.7µF (a 1µF may be used per app circuit). |+| 5 | BAT | power_out | Battery connection to the single-cell Li-ion pack. E42 regulates to 4.2V (V_BAT_FULL = 4.158/4.2/4.242V). Recharge threshold ~4.05V, battery OVP at 104%·V_BAT. Requires ~10µF bypass capacitor to GND. |+| 6 | DONE | output | Open-drain charge-complete status indicator. Sinks current through an external LED (to VIN via limit resistor): LED is off during charging and turns on solid when charging is complete. |+| 7 | CHRG | output | Open-drain charging status indicator. Sinks current through an external LED (to VIN via limit resistor): LED is on while charging and turns off when charging completes. |+| 8 | NC | unconnected | No internal connection. Leave floating or tie to GND. |+| 9 | EPAD | power_in | Exposed thermal pad on package underside. Must be soldered to the PCB ground plane for the specified thermal performance; electrically connected to GND (散热地). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Shenzhen Fuman |+| Package | ESOP-8 |+| Category | PMIC |+| Pins | 9 |++## Ordering variants++- `FM4057E42E42`+- `FM4057E42E43`+- `FM4057E42E44`+- `FM4057E42BE42`+- `FM4057E42S42`+- `FM4057E42S43`+- `FM4057E42S44`+- `FM4057E42S52`+- `FM4057E42BS52`+- `FM4057E42S53`+- `FM4057E42S54`+- `FM4057E42D42`+- `FM4057E42D43`+- `FM4057E42D44`++## CAD (KiCad official)++- Symbol: `FM4057E42`+- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm`+- 3D model: ESOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Shenzhen Fuman datasheet](docs/fm4057e42-datasheet.pdf) (14 pp, sha256 `bfc23830eabbc3b5`, retrieved 2026-08-17, tier: lcsc)+- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.+- **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/fm4057e42-datasheet.pdf)

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