Texas Instruments introduces the industry's smallest and lowest power battery management solution for wearables and IoT products

Texas Instruments bq25120

700-nA quiescent current allows long-term, always-on functionality to help get more life out of your device

Delivering optimal battery life while reducing power consumption, Texas Instruments (TI) introduced a highly integrated battery management solution presenting the industry's lowest quiescent current (Iq) at 700 nA with the buck converter, operating at 1.8 V. The bq25120 features a linear charger, configurable LDO, load switch, buck converter, pushbutton control and battery voltage monitor all in one. The solution supports batteries from 3.6 V to 4.65 V, and fast charge currents from 5 mA to 300 mA, allowing wearables and industrial Internet of Things (IoT) applications to always be on without draining the battery.

exas Instruments (TI) introduced a highly integrated battery management solution bq25120

Features and benefits:

  • Increases System Operation Time Between Charges
    • Configurable 300 mA Buck Regulator (1.8 V Default)
    • 700 nA (typical) Iq with Buck Converter Enabled (No Load)
    • Configurable Load Switch or 100 mA LDO Output (Load Switch by Default)
    • Up to 300-mA Charge Current for Fast Charging
    • 0.5% Accurate Battery Voltage Regulation (Configurable from 3.6 V to 4.65 V in 10-mV Steps)
    • Configurable Termination Current Down to 500 µA
    • Simple Voltage Based Battery Monitor
  • Highly Integrated Solution with Small Footprint
    • 2.5 mm x 2.5 mm WCSP Package and 6 External Components for Minimal Solution
    • Push-Button Wake-Up and Reset with Adjustable Timers
    • Power Path Management for Powering the System and Charging the Battery
    • Power Path Management enables <50 nA Ship Mode Battery Quiescent Current for Longest Shelf Life
    • Battery Charger Operates from 3.4 V – 5.5 VIN (5.5-V OVP / 20-V Tolerant)
    • Dedicated Pins for Input Current Limit, Charge Current, Termination Current, and Status Output
  • I2C Communication Control
    • Charge Voltage and Current
    • Termination Threshold
    • Input Current Limit
    • VINDPM Threshold
    • Timer Options
    • Load Switch Control
    • Controls for Interrupts for Faults and Status
    • System Output Voltage Adjustment
    • LDO Output Voltage Adjustment
  • Applications
    • Smart Watches and other Wearable Devices
    • Fitness Accessories
    • Health Monitoring Medical Accessories
    • Rechargeable Toys

The bq25120 can be used in conjunction with devices to integrate more end application features. Ultra-low Iq step-down converter, the TPS62743 can be used for additional buck output. Boost converters can also be used for display integration. The TPS61046 offers a 12 V boost and the TPS61240 with load connect, offers a 5 V boost for heart rate monitor or small displays.

Tools and support

The bq25120 evaluation module (BQ25120EVM-731) allows customers to speed time to market by quickly and easily evaluate device features and performance.

The BQ25120EVM-731 evaluation module
The BQ25120EVM-731 evaluation module.

Availability and pricing

The bq25120 charger is shipping in volume production and available through the TI Store and the company's authorized distribution network. The product comes in a 2.5 mm by 2.5 mm, WCSP package.

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