bq25700A Battery Buck-Boost Charge Controller

Texas Instruments offers the bq25700A narrow voltage DC (NVDC) SMBus battery buck-boost charge controller with system power monitor and processor

Image of Texas Instruments' bq25700A Battery Buck-Boost Charge ControllerTexas Instruments' bq25700A is a synchronous NVDC battery buck-boost charge controller offering low component count and a high efficiency solution for space-constrained, 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 input source from being overloaded.

The bq25700A charges the 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 the converter to buck, boost or buck-boost configuration based on the 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 bq25700A supports On-the-Go (OTG) function from a 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 current.

The bq25700A monitors adapter current, battery current and system power. The flexibly programmed PROCHOT output goes directly to CPU for throttle back when needed.

  • Charge a 1- to 4-cell battery from a wide range of input sources
    • 3.5 V to 24 V input operating voltage
    • Supports USB2.0, USB 3.0, USB 3.1 (Type C), and USB_PD input current settings
    • Seamless transition between buck and boost operation
    • Input current and voltage regulation (IDPM and VDPM) against source overload
  • Power/current monitor for CPU throttling
    • Comprehensive PROCHOT profile, IMVP8 compliant
    • Input and battery current monitor
    • System power monitor, IMVP8 compliant
  • Narrow-VDC (NVDC) power path management
    • Instant-on with no battery or deeply discharged battery
    • Battery supplements system when adapter is fully-loaded
    • Ideal diode operation in supplement mode
  • Power up USB port from battery (USB OTG)
    • Output 4.48 V to 20.8 V compatible with USB_PD
    • Output current limit up to 6.35 A
  • Low battery quiescent current
  • 800 kHz or 1.2 MHz programmable switching frequency for 1 µH to 2.2 µH low profile inductor
  • Host control interface for flexible system configuration
    • SMBus (bq25700A) port for optimal system performance and status reporting
    • Hardware pin to set input current limit without EC control
  • High accuracy regulation and monitor
    • ±0.5% charge voltage regulation
    • ±2.0% input/charge current regulation
    • ±2.0% input/charge current monitor
    • ±5.0% power monitor
  • Safety
    • Thermal shutdown
    • Input, system, battery overvoltage protection
    • MOSFET inductor overcurrent protection
  • Input current optimizer (ICO) to extract max input power
  • Charge any battery chemistry: Li+, LiFePO4, NiCd, NiMH, lead acid
  • Package: 32-pin 4 x 4 WQFN


  • Ultra-books, notebooks, detachable, and tablet PCs and power bank
  • Industrial and medical equipment
  • Portable equipment with rechargeable batteries

bq25700A Battery Buck-Boost Charge Controller

ImageManufacturer Part NumberDescriptionFunctionBattery ChemistryNumber of CellsAvailable QuantityView Details
IC BATT MON MULTI-CHEM 32WQFNBQ25700ARSNTIC BATT MON MULTI-CHEM 32WQFNBattery MonitorMulti-Chemistry1 ~ 4626 - Immediate
10001 - Factory Stock
View Details

Eval Module

ImageManufacturer Part NumberDescriptionAvailable QuantityView Details
EVAL BOARD FOR BQ25700ABQ25700AEVM-732EVAL BOARD FOR BQ25700A75 - Factory StockView Details
Published: 2017-07-14