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The bq25703A is a synchronous NVDC battery buck/boost charge controller that provides a low component count and efficient solution for space constrained multi-compound battery charging applications.

The NVDC-1 configuration stabilizes the system voltage within the battery voltage range, but not below the system minimum voltage. The system continues to function even when the battery is fully discharged or removed. When the load power exceeds the input source rating, the battery enters a recharge mode and prevents the system from crashing.

The bq25703A charges the battery from a variety of input sources including USB adapters, high voltage USB PD sources, and legacy adapters.

During power-up, the charger sets the converter to a buck, boost, or buck/boost configuration based on the input source and battery conditions. The charger automatically switches between buck, boost, and buck/boost configurations without host control.

With no input source, the bq25703A supports On-the-Go (OTG) functionality from 1 to 4 cells, generating 4.48V to 20.8V on VBUS. In OTG mode, the charger regulates the output voltage and output current.

The bq25703A monitors adapter current, battery current, and system power. The flexibly programmable PROCHOT output goes straight to the CPU, whose frequency can be reduced as needed.

characteristic

Charge 1 to 4 batteries from various input sources

3.5V to 24V Input Operating Voltage

Supports USB 2.0, USB 3.0, USB 3.1 (Type-C) and USB_PD input current settings

Seamless transition between buck and boost operation

Provides input current and voltage regulation (IDPM and VDPM) to protect against power supply overload

Power/current monitor for CPU throttling

Integrated PROCHOT settings, compliant with IMVP8

Input and battery current monitor

System Power Monitor, IMVP8 Compliant

Narrow VDC (NVDC) Power Path Management

Instant start without batteries or with deeply discharged batteries

When the adapter is fully loaded, the battery recharges the system

Power up the USB port from the battery (USB OTG)

Output 4.48V to 20.8V Compatible with USB PD

Output current limit up to 6.35A

800kHz or 1.2MHz Programmable Switching Frequency for 1μH to 3.3μH Inductors

Flexible system configuration via host control interface

I2C (bq25703A) port for optimized system performance and status reporting

Hardware pins can be used to set input current limit without EC control

Integrated ADC monitors voltage, current and power

High-precision regulation and monitoring

±0.5%_charge voltage regulation

±2%_Input/Charge Current Regulation

±2%_Input/Charge Current Monitor

±5%_Power Monitor

safety

thermal shutdown

Input, system, battery overvoltage protection

MOSFET Inductor Overcurrent Protection

Low battery quiescent current

Input Current Optimizer (ICO) for maximum input power

Charge any battery chemistry: Li+, LiFePO4, NiCd, NiMH, lead acid

Package: 32-pin 4 x 4 WQFN