8.1 Overview

The BQ24725A is a 1-4 cell battery charge controller with power selection for space-constrained, multi-chemistry portable applications such as notebook and detachable ultrabook. It supports wide input range of input sources from 4.5V to 24V, and 1-4 cell battery for a versatile solution.

The BQ24725A supports automatic system power source selection with separate drivers for n-channel MOSFETS on the adapter side and battery side.

The BQ24725A features Dynamic Power Management (DPM) to limit the input power and avoid AC adapter over-loading. During battery charging, as the system power increases, the charging current will reduce to maintain total input current below adapter rating.

The SMBus controls input current, charge current and charge voltage registers with high resolution, high accuracy regulation limits.