BQ24650EVM-639: 5 ~ 28V, 8A Solar Charger

The bq24650 is a highly integrated switch-mode battery charge controller. It provides input voltage regulation, which reduces charge current when input voltage falls below a programmed level. When the input is powered by a solar panel, the input regulation loop maintains the panel at maximum power output.

The bq24650 offers a constant-frequency, synchronous PWM controller with high-accuracy current and voltage regulation, charge preconditioning, charge termination, and charge status monitoring.

The bq24650 changes the battery in three phases: preconditioning, constant current, and constant voltage. Charge is terminated when the current reaches one-tenth of the fast charge rate. A programmable fast-charge timer provides a safety backup. The precharge timer is fixed at 30 minutes. The bq24650 automatically restarts the charge cycle if the battery voltage falls below an internal threshold and enters a low, quiescent-current sleep mode when the input voltage falls below the battery voltage.

The bq24650 supports the battery from 2.1 V to 26 V with VFB set to a 2.1-V feedback reference. The charge current is programmed by selecting an appropriate sense resistor. The bq24650 is available in a 16-pin, 3.5x3.5 mm2, thin QFN package.