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[FAQ] BQ25618: [FAQ] Why does ICHG reduce when reaching the maximum duty cycle for the BQ25618, BQ25618E, BQ25619, BQ25611D, BQ25616, BQ25600, BQ25600D, BQ25601, BQ25601D, BQ25606?

Part Number: BQ25618

The charger is basically a step-down DC-DC (buck) converter. It requires the input voltage to be higher than the output voltage with some headroom for normal operations.

  • The maximum duty cycle specification is one of the factors determines the maximum output voltage at a fixed input voltage. Users should avoid maximum duty cycle operations in their applications by setting VINDPM and IINDPM thresholds correctly.
  • Please refer to Extract maximum power from the supply when charging a battery (www.ti.com/.../slyt569.pdf) for the details.