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

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.

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.

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.