UFCS fast charging dual-phase 40W charge pump for mobile and IoT
Halo Microelectronics has developed a Universal Fast Charging Standard (UFCS) fast charging protocol charger for 1-cell Li-ion and Li-ion polymer batteries.
The HL7136 is an UFCS low-voltage fast direct charger 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 2×22µF per phase.
- Dual-phase 30 W charge pump with 1:2 reverse boost
- Nano power DC-DC buck-converter for battery designs
- Fast charging for single cell designs with dual phase
The device uses a switched capacitor converter architecture along with an integrated FET for optimal performance. This design enables efficient operation with a 50% duty cycle in the Charge Pump (CP) mode. By using the CP mode, the output voltage V OUT can be approximately half of the input voltage V IN , while the output current is doubled compared to the input current.
This configuration helps minimize 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 V IN to pass directly to V OUT 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 UFCS is a new protocol soon to be adopted by smartphone manufacturers globally and we are thrilled that our dual-phase 40 W charge pump charger with its low-power fast charging perfectly aligns with this protocol,” said David Nam, CEO of Halo Microelectronics.
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