The automatic lithium battery charging management IC with 900mA dual channel input has been developed by Halo Microelectronics. The compact, flexible and high efficiency switching mode charge management IC ensures the charging operation for single cell Li-ion and Li-polymer batteries used in IoT and wearable applications.

It integrates load switches to accommodate USB and wireless charging sources. Its integrated buck switching charger can operate in boost mode, which powers the linear chargers to charge two accessories simultaneously, ideal for earbud applications, advised the company. In the HL7090FN03 version, the charge parameters can be programmed through the I²C interface.

The IC integrates a synchronous PWM controller, power MOSFET, input current sensing, high-accuracy current, voltage regulation, and charge termination function into a 3.0 x 3.0mm QFN package.

The HL7090 provides fully automatic three-phase battery charging control, including trickle charge, constant current charge (CC), and constant voltage charge (CV) until the battery reaches the charge termination voltage. The input current is automatically limited to the value set by the host and charging is based on the battery voltage and a user-selectable minimum current level. A safety timer with reset control provides a safety backup for the I²C interface.

During normal operation, the IC automatically restarts the charge cycle if the battery voltage falls below an internal threshold and automatically enters sleep mode. It enters high impedance mode when the input supply is not correctly connected. The charge status can be reported to the host through the I²C interface.