Efficient fast charging integrated circuits for lithium-ion and lithium-polymer batteries
HMI has introduced the HL7137, a cutting-edge bi-phase 7.5A, 34W direct charger IC with 2:1 CP(charge pump) designed for lithium-ion and lithium-polymer batteries used in smartphones, tablets and mobile iot devices.
The device integrates advanced technology with a dual-phase switched capacitor converter and reverse blocking MOSFETs (QRB FETs) to ensure optimal performance. Notably, the device achieved an excellent efficiency rating of 97.11% using a 1x22µF per phase flying capacitor configuration at fSW=1.1MHz at 4.5V output and 5A current.
One of the main features of the device is its OVP, which has an external field-effect tube to reduce BOM in various applications. Its 2:1 CP mode allows the output voltage (VOUT) to be adjusted relative to half the input voltage (VIN), doubling the output current compared to the input current.
Since safety is critical in charging operations, the device offers CC(constant current) and CV(constant voltage) regulation via QRB field effect tubes. This instruction is monitored through a closed-loop system with CC adjustment using input or battery current sensing and CV adjustment using battery voltage sensing. The IC also supports a thermal regulation loop in case the CC/CV loop causes the device to overheat when adjusted in 2:1 CP mode.
The device offers a comprehensive protection array including OTP, VIN UVP, OVP, IIN OCP, UCP, QRB RCP(Counter-current protection), PMID to VOUT OV and UV tracking, SCP(Short Circuit protection), watchdog timer and more. In addition, its advanced features include a 12-bit ADC that provides important information such as VIN, IIN, VOUT, VBAT, IBAT, VTS and TDIE to optimize charge control.
"With the launch of the HL7137, HMI reaffirms its commitment to provide leading solutions that prioritize battery charging efficiency, safety and performance," said Mason Choi, vice president/general manager of HMI's Mobile Audio Solutions Group.
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