The HL7132D is a low-voltage fast direct charger for 1-cell Li-ion and Li-polymer batteries that integrates a dual-phase switched capacitive converter and reverse blocking MOSFET (QRB FET) while achieving over 97 percent efficiency at 4.5 V output, and 4 A current, with one flying capacitor of 1x22µF per phase at FSW = 1.1 MHz.
The device features two different switching modes - a 2:1 charge pump mode that allows the output voltage (VOUT) to be around half of the input voltage (VIN), and the output current to be doubled the input current and a 1:2 reverse charge pump mode that allows a voltage at VIN double the VOUT voltage.
In addition, the device provides constant current (CC) and constant voltage (CV) regulations through controlling QBR FET for safe charging operation in a 2:1 charge pump mode. The CC regulation is closely monitored through a close loop of the input current sensing or battery current sensing and the CV regulation is controlled through a close loop of the battery voltage sensing.
To further enhance safety, the device is equipped with a thermal regulation loop that kicks in if the CC/CV loop results in overheating during the operation in 2:1 charge pump mode.
The HL7132D is available in a 2.95 mm x 2.6 mm, 42-bump WLCSP, and is intended for smartphones, tablet computing, and IoT devices.
