Texas Instruments

bq25703A I²C Battery Buck-Boost Charge Controller

Texas Instruments offers the bq25703A narrow voltage DC (NVDC) I²C battery buck-boost charge controller with system power monitor and processor

Image of Texas Instruments' bq25703A I²C Battery Buck-Boost Charge ControllerTexas Instruments' bq25703A 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 bq25703A 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 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 current.

The bq25703A monitors adapter current, battery current and system power. The flexibly programmed PROCHOT output goes directly to CPU for throttle back when needed.

Features
  • 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
  • Input current optimizer (ICO) to extract max input power
  • 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
    • I²C (bq25703A) 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
  • Low battery quiescent current
  • Charge any battery chemistry: Li+, LiFePO4, NiCd, NiMH, lead acid
  • Package: 32-pin 4 x 4 WQFN

Applications

  • Drones, Bluetooth® speakers, IP cameras, detachable and tablet PCs, and power banks
  • Industrial and medical equipment
  • Portable equipment with rechargeable batteries

bq25703A I²C Battery Buck-Boost Charge Controller

ImageManufacturer Part NumberDescriptionNumber of CellsFault ProtectionInterfaceAvailable QuantityPriceView Details
IC BAT MON MULT-CHEM 1-4C 32WQFNBQ25703ARSNTIC BAT MON MULT-CHEM 1-4C 32WQFN1 ~ 4Over Current, Over Temperature, Over VoltageI2C1092 - Immediate$42.81View Details
Published: 2017-07-14

Related Product Highlight

DRV8231/A 33 V H-Bridge Motor Drivers Texas Instruments' DRV8231/A 33 V H-bridge motor drivers are designed to drive one brushed DC motor from a 4.5 V to 33 V supply rail.
BQ24800 Hybrid Power Boost-Mode Battery Charge Controller Texas Instruments' BQ24800 hybrid power boost-mode battery charge controller is suitable for applications such as portable and industrial equipment.
TAS2770 Mono Class-D Audio Amplifier Texas Instruments' TAS2770 is an audio amplifier optimized for mobile applications where efficient battery operation and small solution size are crucial.

Related Articles and Blogs

Use Application-Specific Battery PMICs to Get Designs Finished Quickly Application-specific power-management ICs (PMICs) save designers’ time by targeting target well-defined niches and simplifying the design task.
Automatic Efficiency Enhancement Keeps Buck Converter Efficiency High at Lower Output Voltages Learn how Texas Instruments' proprietary technique enables the step-down DC/DC converter to keep efficiency high even when the output voltage is low.
Optimal Power Management Techniques in Energy Harvesting Designs Battery size constraints in energy harvesting systems necessitate creativity and innovation in order to maximize efficiency of the power source.

Related Product Training Modules

Telecom Point of Load Solutions Telecom power solutions review with focus on the non-isolated DC/DC point of load and examples of the latest POL solutions.
NexFET MOSFET Technology Learn how power designers can achieve 90%+ power-supply efficiency's with double the frequency by utilizing advanced MOSFET technologies such as TI's NexFET.