MCP73831T-2ACI

@@ -0,0 +1,47 @@+# MCP73831T-2ACI++**Microchip Tech** · Battery Management · SOT-23-5++MCP73831T-2ACI from Microchip Tech, in a SOT-23-5. 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 | STAT | output | Charge status output. On the MCP73831 this is a tri-state output (High, Low, High-Z) capable of sinking up to 25 mA (VOL ≈ 0.4 V at ISINK = 4 mA) and sourcing up to 35 mA (VOH ≥ VDD − 1 V at ISOURCE = 4 mA). Typically used to drive one or two status LEDs or interface to a host MCU. |+| 2 | VSS | power_in | Device ground / negative supply return. All input and output voltages are referenced to this pin. PROG programming resistor RPROG is returned to VSS. |+| 3 | VBAT | power_out | Battery charge control output. Drain of the internal P-channel pass MOSFET; delivers the constant charge current and regulated float voltage (factory-set to 4.20 V, 4.35 V, 4.40 V or 4.50 V ±0.75%) to the positive terminal of the single-cell Li-Ion / Li-Polymer pack. A ≥4.7 µF bypass capacitor to VSS is recommended for loop stability. |+| 4 | VDD | power_in | Battery management input supply. Accepts 3.75 V to 6 V (7 V absolute max). Below the UVLO stop threshold (VSTOP ≈ 3.38 V) the device enters power-down to prevent battery drain. A 4.7 µF bypass capacitor to VSS is recommended. |+| 5 | PROG | input | Current regulation set / device enable input. A resistor RPROG from PROG to VSS sets the fast-charge current per IREG = 1000 V / RPROG (RPROG = 2 kΩ to 67 kΩ → 15 mA to 500 mA). Allowing PROG to float, or forcing it to a logic high, disables the device and terminates the charge cycle (shutdown current ~25 µA typ). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Microchip Tech |+| Package | SOT-23-5 |+| Category | Power Management (PMIC) |+| Pins | 5 |++## Ordering variants++Same part, different packaging or reel option.++- `MCP73831T-2ACI/OT`+- `MCP73831T-2ACI/MC`++## CAD (KiCad official)++- Symbol: `MCP73831T-2ACI`+- Footprint: `Package_TO_SOT_SMD:SOT-23-5`+- 3D model: SOT-23-5 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Microchip Tech datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588884548142292992) (28 pp, sha256 `f2123088a8b39764`, 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/mcp73831t-2aci-datasheet.pdf)

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