MCP73831
Public Made by Adomby adom
Microchip single-cell LiPo linear charger, SOT-23-5. 4.20 V, programmable current, integrated pass FET. Datasheet-verified.
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markdownMCP73831
Microchip Technology · Li-Ion / LiPo battery charger · SOT-23-5
Miniature, fully integrated single-cell Li-Ion / Li-Polymer linear charge-management controller in a SOT-23-5 package. It regulates a 4.20 V constant-voltage float with a constant-current phase set by one resistor on PROG (up to 500 mA), and integrates the pass transistor, current sensing, and reverse-discharge protection. A STAT pin drives a charge-status LED. The default USB-powered LiPo charger for small devices; just add the PROG resistor and a status LED.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | STAT | tri_state | Charge Status Output. Tri-state logic output on the MCP73831 (open-drain on MCP73832). Drives an indicator LED directly (ISINK up to 25 mA, VOL ≈ 0.4 V at 4 mA; ISOURCE up to 35 mA, VOH ≥ VDD-1 at 4 mA) or can be pulled up for interfacing to a host microcontroller. |
| 2 | VSS | power_in | Battery Management 0 V Reference. Connect to the negative terminal of the battery and the input supply return. |
| 3 | VBAT | power_out | Battery Charge Control Output. Connect to the positive terminal of the single-cell Li-Ion/Li-Polymer battery; this is the drain of the internal P-channel MOSFET pass transistor (RDSON ≈ 350 mΩ). Bypass to VSS with a minimum of 4.7 µF to ensure loop stability when the battery is disconnected. Regulated to VREG (4.20/4.35/4.40/4.50 V option) at ±0.75%. |
| 4 | VDD | power_in | Battery Management Input Supply. Recommended range [VREG(typical) + 0.3 V] to 6 V (absolute max 7 V). Bypass to VSS with a minimum of 4.7 µF. Supply current is 510 µA typical while charging. |
| 5 | PROG | input | Current Regulation Set and Charge Control Enable. A resistor from PROG to VSS programs the preconditioning, fast-charge, and termination currents (RPROG range 2 kΩ to 67 kΩ; e.g., 2 kΩ → 505 mA, 10 kΩ → 100 mA, 67 kΩ → 14.5 mA typical). Allowing PROG to float (impedance ≥ 70 kΩ, minimum shutdown impedance) disables the charge management controller. |
Key specifications
| Parameter | Value |
|---|---|
| Type | Single-cell Li-Ion/LiPo linear charger |
| Regulation voltage | 4.20 V (-2 variant) |
| Charge current | Programmable via PROG (15-500 mA) |
| Integrated | Pass transistor, current sense, reverse-discharge protection |
| Status | STAT open-drain (charge LED) |
| Preconditioning + termination | Automatic |
| Package | SOT-23-5 |
| Body (L×W×H) | 2.9 × 1.6 × 1.1 mm |
Ordering variants
Same part, different packaging or reel option.
MCP73831T-2ACI/OT (SOT-23-5, 4.20 V)MCP73831-2ACI/OT (SOT-23-5)
CAD (KiCad official)
- Symbol:
Battery_Management:MCP73831-2-OT - Footprint:
Package_TO_SOT_SMD:SOT-23-5 - 3D model: SOT-23-5 (KiCad packages3D)
- 3D model files:
mcp73831-etched.step/mcp73831-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);mcp73831.step/mcp73831.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Microchip Technology datasheet (29 pp, sha256
75297f2a52355993, retrieved 2026-08-17, tier: manufacturer) - Extractor:
ds2sf(Claude) — every pin and dimension is cited to a datasheet page; refuses to fabricate. - CAD: KiCad official libraries (CC-BY-SA 4.0).