bq24600 Switch-Mode Battery Charge Controller The Texas Instruments bq24600 highly integrated Li-ion or Li-polymer switch-mode battery charge controller offers a constant-frequency synchronous PWM controller with high accuracy charge current and voltage regulation, charge preconditioning, termination, and charge status monitoring. The TI bq24600 1.2 MHz NMOS-NMOS synchronous buck converter charges the battery in three phases: preconditioning, constant current, and constant voltage. This TI battery charge controller is designed for use in a variety of handheld and portable devices and equipment.