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Announcement: Check out our latest video on the HL5301, the industry's smallest SIM card level translator.

Overview

The HL7138 is the low voltage fast direct charger for 1 cell Li-ion and Li-polymer batteries. The device integrates a dual phase switched capacitor converter and reverse blocking MOSFET (QRB FET). The HL7138 has 97.4% efficiency at 4.5V output and 5A current with 2x22uF per phase. 

The switched capacitor converter architecture and the integrated FETs in device are optimized to enable 50% duty cycle operation under charge pump (CP) mode. The CP mode allows output voltage (VOUT) to be around half of the input voltage (VIN) and output current to double the input current, reducing input power cable loss and limiting temperature rise in application. The dual-phase architecture reduces input capacitance requirements and input voltage ripple. Besides the CP mode, the device also has bypass (BP) mode. The BP mode allows VIN forwardly passing through internal power FETs to VOUT without any conversion. 

The HL7138 provides CC (Constant Current) and CV (Constant Voltage) regulations through controlling the QRB FET for safe charging operation. The CC regulation is controlled through a closed loop of input current sensing or battery current sensing. The CV regulation is controlled through a closed loop of battery voltage sensing. In addition, the HL7138 also supports thermal regulation loop in case the CV/CC regulation causes overheating device. 

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

 

Features

  • High reliable AMR input/output pins
    • 37V AMR on VBUS
    • 20V AMR on VIN pin
    • 7V AMR on VOUT, BATP
  • Built-in external input NFET control
  • Wide range operating voltage
    • 3V to 11.7V operational VIN voltage
    • 5.5V Max operational output voltage
  • Dual conversion modes
    • 2:1 Charge pump mode (CP mode)
      • Optimized for 50% duty
    • 1:1 Bypass mode (BP mode)
  • High efficiency charge pump
    • 97.4% Efficiency for VOUT = 4.5V_5A with 2x22uF
    • 97.6% Efficiency for VOUT = 4.5V_5A with 3x22uF
  • Regulation loop for charging operation through QRB FET control. 
    • Input current regulation
    • Battery voltage regulation
    • Battery current regulation
    • Thermal regulation
  • Selectable switching frequency from 500kHz to 1.6MHz

Block Diagram

HL7138 - HMI Main Photo

For more information or a full datasheet request, please contact the factory at sales@hmisemi.com.

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