HL7139A

Overview

The HL7139A 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 and reverse blocking MOSFET (QRB FET) and shows 97.4% efficiency for 4.5V output and 5A charging current with 2x22uF per phase.

The switched capacitor converter architecture of this device and the integrated FET are optimized to enable a 50% duty cycle operation under Charge Pump (CP) Mode. The 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, reducing the losses over the input power cable as well as limiting the temperature rise in the application. The dual-phase architecture reduces the input capacitance requirements as well as reducing the input voltage ripple. Besides CP Mode, the device also has Bypass (BP) Mode. BP Mode allows VIN forwardly passing through internal power FETs to VOUT without any conversion.

The HL7139A provides CC regulation and CV regulation through controlling the QRB FET for a safe charging operation. CC regulation is controlled through a close loop of the input current sensing or battery current sensing and CV regulation is controlled through a close loop of the battery voltage sensing. In addition, HL7139A also supports thermal regulation loop in case CV/CC loop causing device over-heat during regulation operating.

For more detailed description of the device, please download a product brief.