SLUAA33A April   2020  – October 2022 BQ25970

 

  1.   How to use the BQ25970 for Flash Charging
  2.   Trademarks
  3. 1Introduction
    1. 1.1 Key BQ25970 Specifications
    2. 1.2 BQ25970 Simplified Power Stage
  4. 2PPS Protocols for BQ25970
    1. 2.1 What is the PPS Protocol?
    2. 2.2 PPS Protocol Working Process Sample
  5. 3Key Design Tips for BQ25970
    1. 3.1 Simplified Schematic
    2. 3.2 How to Translate R on Power Trace From input to Output of BQ25970 or Reversely
    3. 3.3 PCB Layout Tips for BQ25970
  6. 4References
  7. 5Revision History

1.1 Key BQ25970 Specifications

The BQ25970 has the following specifications:

  • 97% Efficient power stage for 8-A fast charge
  • Switched capacitor architecture optimized for 50% duty cycle:
    • Input voltage is 2 × battery voltage (3.5 V to 4.65 V)
    • Output current is 2 × of input current (up to 4.5 A)
    • Reduces power loss across the cable
  • Integrated programmable protection features for safe operation
    • Input overvoltage protection (BUS_OVP)
    • Input overcurrent protection (BUS_OCP) with adjustable alarm
    • Input overvoltage with external OVP FET (VAC_OVP up to 17 V, bq25970 only)
    • Battery overvoltage protection (BAT_OVP) with adjustable alarm
    • Output overvoltage (VOUT_OVP)
    • Input overcurrent protection (BUS_OCP) with adjustable alarm
    • IBAT overcurrent protection (BAT_OCP) with adjustable alarm
    • Battery temperature monitoring
    • Connector temperature monitoring
  • Integrated 12-bit effective analog-to-digital converter (ADC)
    • ±0.5% BUS voltage
    • ±0.5% VOUT voltage
    • –0.4% to 0.2% BAT voltage with differential sensing
    • ±1.5% BAT current at 6 A with External RSENSE
    • ±1% BAT temperature
    • ±1% BUS temperature
    • ±4°C Die temperature