FS4054A

@@ -0,0 +1,46 @@+# FS4054A++**FOSAN** · Battery Management · SOT-23-5L++FS4054A from FOSAN, 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. Pulls low (sinks current, typically driving an LED to VCC through a series resistor such as 330 Ω) while charging is in progress; goes to high impedance when charging terminates (C/10) or the part is in shutdown/standby. Absolute max voltage 7 V. |+| 2 | GND | power_in | Device ground reference for all internal circuitry and the external PROG resistor return. |+| 3 | BAT | power_out | Charge current output to the single-cell Li-ion battery. Regulates to the 4.2 V float voltage in CV mode and delivers up to 500 mA in CC mode. Sources <=2 uA leakage from the battery when VCC is removed. Absolute max 7 V; continuous short-circuit safe. Typically decoupled with ~10 uF to GND. |+| 4 | VCC | power_in | Input supply, 4.5-5.5 V nominal (absolute max 7 V), commonly driven from a USB port or 5 V DC adapter. Undervoltage lockout threshold ~3.4 V; supply current is typically 170 uA during charge and <=25 uA in standby. Decouple with ~1 uF to GND. |+| 5 | PROG | input | Charge current programming pin. Connect a resistor R_PROG from PROG to GND to set the constant-current charge level per I_BAT (mA) = 1000 / R_PROG (kΩ); e.g. 2 kΩ → 500 mA, 10 kΩ → 100 mA. Servos to ~1.03 V in CC mode; can also be used to monitor the actual charge current. Absolute max VCC+0.3 V, 800 uA. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | FOSAN |+| Package | SOT-23-5L |+| Category | PMIC |+| Pins | 5 |++## Ordering variants++- `FS4054A`+- `FS4054AFS4054B`++## CAD (KiCad official)++- Symbol: `FS4054A`+- 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:** [FOSAN datasheet](docs/fs4054a-datasheet.pdf) (5 pp, sha256 `42d795be437a7d9c`, 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/fs4054a-datasheet.pdf)

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