This is a Universal Fast Charging Standard (UFCS) fast charging protocol charger for 1-cell Li-ion and Li-ion polymer batteries that integrates a dual-phase switched-capacitor converter and reverse blocking MOSFET (QRB FET), achieving a 97.4% efficiency for 4.5V output and 5A charging current with 2x22µF per phase.
The device has been designed with a switched capacitor converter architecture along with an integrated FET for optimal performance. This enables efficient operation with a 50% duty cycle in the Charge Pump (CP) mode. By using the CP mode, the output voltage VOUT can be approximately half of the input voltage VIN, while the output current is doubled compared to the input current. This configuration helps limit losses over the input power cable and prevents excessive temperature rise in the application.
The HL7136 also features a Bypass (BP) Mode. In BP Mode, the internal power FETs allow the VIN to pass directly to VOUT without undergoing any conversion process. This mode provides a straightforward path for the input voltage, catering to specific applications where voltage conversion is unnecessary.
The HL7136 provides Constant Current (CC) and Constant Voltage (CV) regulations, ensuring a secure charging operation by controlling the QRB FET. Furthermore, the device includes a thermal regulation loop to address any potential overheating issues that may arise during the CV/CC regulation process.
The device is also equipped with all the necessary protective measures.
