HL7137

The HL7137 is the low voltage fast direct charger for 1 cell Li-ion and Li-polymer batteries. The device integrates a dual phase switched capacitive converter, a reverse blocking MOSFET (QRB FET) and shows 97.4% efficiency at 4.4V output and 5A current with flying capacitor, 2x22µF, per phase. The device features an OVP protection with an external FET to reduce the total BOM in applications. The 2:1 CP mode allows the output voltage, VOUT, to be around half of the input voltage, VIN, and the output current to be double of the input current. The device provides CC (Constant Current) and CV (Constant Voltage) regulation through the QRB FET for a safe charging operation in 2:1 CP mode. The CC regulation is controlled through a close loop of the input current sensing and CV regulation is controlled through a close loop of sensing the battery voltage. In addition, the device also supports thermal regulation loop in case CV/CC loop causing device over-heat during regulation operating in 2:1 CP mode. The device has all the necessary protections to ensure the safe operation. The device includes OTP (Over-Temperature Protection), VIN UVP (Under-Voltage Protection), OVP (Over-Voltage Protection), IIN OCP (Over-Current Protection), UCP (Under-Current Protection), VOUT OVP/UVP, VBAT OVP, OCP, PMID to VOUT OV/UV Tracking, CFLY SCP (Short Circuit Protection), VIN SCP, VOUT SCP, QRB RCP (Reverse-Current Protection) and Watchdog Timer. Besides all the protections above, the device also features 12-bit ADC that offers VIN, IIN, VOUT, VBAT , VTS, TDIE information to system for optimizing charging control.