The ADP3820 is a precision single‑cell Li‑Ion battery charger controller with low dropout, high accuracy, and programmable charge current.
The ADP3820 from Analog Devices is a precision linear charger controller for single‑cell Li‑Ion batteries. It operates from a wide input range (4.5 V‑15 V) and provides accurate output voltage regulation (±1 %). The device is designed to work with an external P‑channel MOSFET, allowing low‑cost, low‑dropout charging solutions.
Key features include integrated reverse‑leakage protection, a 6‑V gate‑to‑source clamp, programmable charge current via an external resistor, and fold‑back current limiting for safety. The controller is supplied in 6‑lead SOT‑23‑6 and 8‑lead SO‑8 packages and is rated for operation from –20 °C to +85 °C.
| Input Voltage (VIN) | 4.5 V – 15 V |
|---|---|
| Shutdown Current (quiescent) | 1 mA (typical) |
| Normal Mode Output Current | 630 mA (typical) |
| Gate‑to‑Source Clamp Voltage | 6 V – 10 V |
| Gate Drive Minimum Voltage | 20.7 V |
| Current Limit Threshold Voltage | 40 mV – 75 mV |
The ADP3820 draws about 1 mA in shutdown mode.
It operates with an input voltage from 4.5 V up to 15 V.
Yes, it includes integrated reverse‑leakage protection, eliminating the need for an external blocking diode.