TIDT406 August   2024

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Required Equipment
    3. 1.3 Dimensions
  6. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Thermal Images
  7. 3Waveforms
    1. 3.1 Start-Up and Shutdown
    2. 3.2 Charge Enable and Disable
    3. 3.3 Typical Charge Waveforms
    4. 3.4 Typical OTG Waveforms
    5. 3.5 OTG Transient
  8.   Trademarks

Description

This battery charger is designed for a 40V, 320W notebook PC, featuring the BQ25770G quasi-dual-phase buck-boost battery charge controller. This reference design delivers 320W with 98% peak efficiency, and spreads out the heat across two parallel half bridges and inductors. Gallium nitride (GaN) field effect transistors (FETs) are chosen as the high-side FETs for high efficiency, and silicon FETs are chosen as the low-side FETs for low cost. This hybrid-FET reference design is cost-effective and highly-efficient for high-power multicell battery chargers.