The device integrates a dual phase switched capacitive converter and reverse blocking MOSFET (QRB FET) to achieve a 97.4% efficiency for 4.5V output and 5A charging current with 2x22µF per phase.
The switched capacitor converter architecture and integrated FET in the HL7139A are optimised to enable a 50% duty cycle operation under charge pump (CP) mode, which allows the output voltage to be around half of the input voltage. This reduces losses over the input power cable and helps to limit the temperature rise in the application. The dual-phase architecture also reduces input capacitance requirements and input voltage ripple. In addition, the device also has a bypass (BP) mode that allows the input voltage to pass through to the output without any conversion.
The HL7139A provides CC regulation and CV regulation by controlling the QRB FET for a safe charging operation. The device includes all the necessary protections such as OTP (over-temperature protection), VIN UVP/OVP, IIN OCP/UCP, VOUT OVP/UVP, VBAT OVP, IBAT OCP, PMID to VOUT OV/UV, CFLY SCP (short circuit protection), VIN SCP, VOUT SCP, and a Watchdog Timer.
The device also features a 12-bit ADC that can provide information to optimise charging control.
The HL7139A is available in a 36-bump WLCSP package, making it a great option for compact electronic devices, such as smartphones, tablet PCs, and mobile IoT devices.
