JSM4057

@@ -0,0 +1,46 @@+# JSM4057++**JSMSEMI** · Battery Management · SOT-23-6L++JSM4057 from JSMSEMI, in a SOT-23-6L. 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 by the internal switch while the battery is being charged; high-impedance otherwise. Typically drives a red LED to VCC through a series resistor. VOL ≈ 0.3 V @ 5 mA sink. |+| 2 | GND | power_in | Device ground / power return. |+| 3 | BAT | power_out | Battery positive terminal. Sources charge current to the cell and regulates to 4.2 V float voltage. In standby / no-VCC condition, BAT leakage current is <3 uA. Absolute max BAT current 600 mA; absolute max voltage -0.3 V to 7 V. |+| 4 | VCC | power_in | Input supply (USB or adapter). Operating range 4.0 V - 6 V (absolute max -0.3 V to 7 V). Charging begins when VCC is above the UVLO threshold (typ 3.7 V) AND at least 100 mV above BAT. A 2.2 uF decoupling capacitor to GND is recommended. |+| 5 | STDBY | output | Open-drain charge-complete indicator. Pulled low by the internal switch when the charge cycle has terminated; high-impedance during charging or fault. Typically drives a green LED. VOL ≈ 0.3 V @ 5 mA sink. |+| 6 | PROG | input | Constant-current programming pin. Connect a resistor RPROG from PROG to GND to set the fast-charge current: IBAT = 1000 V / RPROG (e.g. 2 kΩ → 500 mA). PROG is regulated to 1.0 V in constant-current mode and 0.1 V in trickle mode; termination occurs when the servo voltage falls below 100 mV for >2 ms. Absolute max PROG voltage -0.3 V to 0.3 V; max current 600 uA. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | JSMSEMI |+| Package | SOT-23-6L |+| Category | PMIC |+| Pins | 6 |++## Ordering variants++- `JSM4057TP4057`++## CAD (KiCad official)++- Symbol: `JSM4057`+- Footprint: `Package_TO_SOT_SMD:SOT-23-6`+- 3D model: SOT-23-6L (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [JSMSEMI datasheet](docs/jsm4057-datasheet.pdf) (6 pp, sha256 `a94e1f5c3680b72e`, 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/jsm4057-datasheet.pdf)

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