SLUAAG9 September   2021 BQ25170 , BQ25171-Q1 , BQ25175

 

  1.   Trademarks
  2. 1Introduction
  3. 2BQ25171-Q1 Design Decisions
  4. 3700 mA/70 mA Variable Charge Current Li-Ion Fast Charge Design
  5. 4200 mA Time Charge 3S NiMH Design
  6. 545 mA Fast Charge LiFePO4 Design
  7. 6Pin Configuration
  8. 7R-ISET Common Values
  9. 8Common Questions: Tips and Tricks

4 200 mA Time Charge 3S NiMH Design

Figure 4-1 provides a solution that will charge 3 series NiMH battery cells at 200 mA for 14 hours.

  • R-ISET will set fast charge current to 200 mA, 1.5 kΩ.
  • R-CHM_TMR will set chemistry to NiMH with a 14 hour charge timer, 11 kΩ.
  • R-VSET will set the cell count to 3 and enable optional intermittent charge, 18 kΩ.
  • /CE pin is connected to host MCU for external device control.
  • R-TS is required, a 10 kΩ resistor is connected to GND to disable this function.
  • STAT1/STAT2 LEDs are used together to indicate charge status and faults, they are optional.

This application supports medium capacity multi-cell NiMH batteries.

GUID-20210928-SS0I-S8K1-ZLJR-NKBVZWGXJX2L-low.pngFigure 4-1 NiMH 200-mA Time Charge Design