Dual-channel input with integrated boost SoC Li-Ion battery switching charger

Halo Microelectronics has released its HL7090, a fully automatic and highly integrated lithium battery charging management IC with one switching charger, two linear chargers, and full-range programmable charge parameters through an I2C compatible interface.

The device is a flexible, compact, and high-efficiency switching-mode charge management IC for single-cell Li-ion and Li-polymer batteries employed in many IoT and wearable applications, as well as ear pods. The device combines load switches to accommodate USB and wireless charging sources. Its integrated buck switching charger can work in boost mode, which powers the linear chargers to charge two accessories at the same time, perfect for earbud applications. The charge parameters may be programmed via the I2C interface (HL7090FN03 version). The IC combines a synchronous PWM controller, power MOSFET, high-accuracy current, input current sensing, voltage regulation, and charge termination function into a tiny 3mm x 3mm QFN package.

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

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

“Our new Li-ion battery switching charger IC with its fully automatic charge management takes all the worries out of charging IoT applications, providing convenience, no hassle, and peace of mind,” said David Nam, CEO of Halo Microelectronics.”