The BQ24810 is a 1-4 cell buck 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 4.5 V to 24 V, and 1-4 cell battery for a versatile solution. As a buck charger, it requires an adapter voltage greater than the maximum battery voltage.

The BQ24810 supports automatic system power source selection with separate drivers for n-channel MOSFETS on the adapter side and battery side.

The BQ24810 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. If system power demand temporarily exceeds the adapter rating, the BQ24810 supports hybrid power boost mode (previously called "turbo boost mode") to boost the battery voltage through the switching regulator in order to provide supplement current.

Most adapters have the ability to maintain a current level above their nominal rating for a milliseconds or even tens of milliseconds. The BQ24810 has two level input current DPM, also known as Peak Power mode, to allow the user to extend the input current DPM to support a higher input current for a programmable overload time, then allow the adapter to recover by fixing the input current limit at the nominal rating. This allows full utilization of the adapter capabilities to reduce battery discharge.

When powering the system directly from the battery without an adapter, the battery voltage may fall below the level required to maintain the system. BQ24810 provides the battery only boost mode to boost the system voltage above the battery voltage, allowing the system to utilize the remaining battery power for extended battery life.

The BQ24810 closely monitors system power (PMON), input current (IADP) and battery discharge current (IDCHG) with highly accurate current sense amplifiers. If current is too high, adapter or battery is removed, a PROCHOT signal is asserted to CPU so that the CPU optimizes its performance to the power available to the system.

The SMBus controls input current, charge current and charge voltage registers with high resolution, high accuracy regulation limits. It also sets the PROCHOT timing and threshold profile to meet system requirements.