SLUAAG9 September   2021 BQ25170 , BQ25171-Q1 , BQ25175

 

  1.   Trademarks
  2. 1Introduction
  3. 2BQ25171-Q1 Design Decisions
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  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

7 R-ISET Common Values

Calculations for resistor ISET are provided in the data sheet. Table 7-1 provides a reference of calculated resistor values for various fast charge currents. Resistors with ±1% tolerance or better are recommended to minimize charge current error.

Table 7-1 Calculated Resistor Values
ICHG (mA) R-ISET (Ω) Closest Standard Resistor (Ω)
10 30 k 30.1 k
30 10 k 10.0 k
50 6000 6040
100 3000 3010
200 1500 1500
300 1000 1000
400 750 750
500 600 604
600 500 499
700 429 432
800 375 374

Tables 7-1 and 7-2 in section 7.3.1 in Data Sheet provide appropriate resistor values to use to set CHM_TMR and VSET pins.