This device is a synchronous NVDC buck-boost battery charge controller, offering a low component count, high efficiency solution for space constrained, 1s-4s battery charging applications.The NVDC 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 BQ25713/BQ25713B 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 BQ25713/BQ25713B supports USB On-the-Go (OTG) function from 1- to 4-cell
battery to generate adjustable 3 V to 20.8 V on VBUS with 8 mV resolution. The OTG
output voltage transition slew rate can be configurable, which is complied with the
USB PD 3.0 PPS specifications.When only battery powers the system
and no external load is connected to the USB OTG port, the BQ25713/BQ25713B supports the Vmin Active Protection (VAP) feature, in
which the device charges up the VBUS voltage from the battery to store some energy
in the input decoupling capacitors. During the system peak power spike, the huge
current drawing from the battery creates a larger voltage drop across the impedance
from the battery to the system. The energy stored in the input capacitors will
supplement the system, to prevent the system voltage from dropping below the minimum
system voltage and causing the system crash. This Vmin Active Protection (VAP) is
designed to absorb system power peaks during periods of SOC high power demand, which
is highly recommended by Intel for the platforms with 1S~2S battery.The BQ25713/BQ25713B monitors adapter current, battery current and system
power. The flexibly programmed PROCHOT output goes directly to
CPU for throttle back when needed.
