The bq25703A is a synchronous NVDC battery buck-boost charge controller,
offering low component count, high efficiency solution for space-constraint, multi-chemistry
battery charging applications.
The NVDC-1 configuration allows the system to be regulated at battery voltage, but not
drop below system minimum voltage. The system keeps operating even when the battery is completely
discharged or removed. When load power exceeds input source rating, the battery goes into
supplement mode and prevents the system from crashing.
The bq25703A charges battery from a wide range of input sources including USB
adapter, high voltage USB PD sources and traditional adapters.
During power up, the charger sets converter to buck, boost or buck-boost configuration
based on input source and battery conditions. The charger automatically transits among buck, boost
and buck-boost configuration without host control.
In the absence of an input source, the bq25703A supports On-the-Go (OTG) function from 1- to 4-cell battery to
generate 4.48 V to 20.8 V on VBUS. During OTG mode, the charger regulates output voltage and output
The bq25703A monitors adapter current,
battery current and system power. The flexibly programmed PROCHOT output
goes directly to CPU for throttle back when needed.
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