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Texas Instruments Battery Charge Management Solutions for Wearables and IoT

The bq25120 is a highly integrated battery charge management IC that integrates the most common functions for wearable devices: Linear charger, regulated output, load switch, manual reset with timer, and battery voltage monitor. The integrated buck converter is a high efficiency, low IQ switcher using DCS control that extends light load efficiency down to 10-µA load currents. The low quiescent current during operation and shutdown enables maximum battery life. The device supports charge currents from 5 mA to 300 mA. The input current limit, charge current, buck converter output voltage, LDO output voltage, and other parameters are programmable through the I2C interface.

The battery is charged using a standard Li-Ion charge profile with three phases: precharge, constant current and constant voltage. A voltage-based JEITA compatible battery pack thermistor monitoring input (TS) is included that monitors battery temperature and automatically changes charge parameters to prevent the battery from charging outside of its safe temperature range. The charger is optimized for 5-V USB input, with 20-V tolerance to withstand line transients. The buck converter is run from the input or battery. When in battery only mode, the device can run from a battery up to 4.65 V.

A configurable load switch allows system optimization by disconnecting infrequently used devices. The manual reset with timer allows multiple different configuration options for wake are reset optimization. A simple voltage based monitor provides battery level information to the host in 2% increments from 60% to 100% of the programmed V.

Features/Applications

Key Features:

Low battery current draw
Low Iq allows wearables to be always-on without draining the battery. Shipmode allows shipping the device with the longest battery shelf life.

Small Size
2.5mm x 2.5mm WCSP Package 15 mm² solution size (components)

Integration
Linear Charger: 300mA, 3.4V-5.5V input, 20V max LDO: 100mA
Buck Converter: 300mA, 2.2V- 6.6V input Power  path (switcher)
Load switch pushbutton control
battery voltage monitor: Accurate 2% VBATREG
I2C programmable flexibility to set all key parameters including ICHG, VBATREG, ITERM

Applications:

  • Fitness Accessories
  • Smart Watches and other Wearable Devices
  • Health Monitoring Medical Accessories
  • Rechargeable Toys

On Person Applications:

  • Air Quality Monitor
  • Radiation Level Monitor
  • Secure Access
  • Game Controllers

On Equipment Applications:

  • Asset Tracking
  • Speed/Position Sensors
  • Level Detectors
  • Remote Payment
  • Stock Monitoring
  • Appliance Automation

Environment Applications:

  • Leak Detection
  • Remote Measurement
  • Smart Agriculture

Evaluation Module

The bq25120EVM-731 evaluation module is a highly integrated battery charge management IC that integrates the most common functions for wearables devices: Linear charger, regulated output, load switch, manual reset with timer, and battery voltage monitor. The low quiescent current during operation and shutdown enables a maximum battery life. The device supports charge currents from 5 mA to 300 mA. The input current limit, charge current, PWM output voltage, LDO output voltage, and other parameters are programmable through the I2C interface. The battery is charged using a standard Li-Ion charge profile with three phases: precharge, constant current and constant voltage.

Features

  • Configurable 300 mA Buck Regulator (1.8 V default)
  • 700 nA typical IQ with PWM Enabled (No Load)
  • 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 uA

 

Resources

Texas Instruments

Battery Charge Management

The BQ25120EVM-731 evaluation module is a highly integrated battery charge management IC that integrates the most common functions for wearables devices

Part DETAILS
Texas Instruments

bq25120 highly integrated battery charge management ICs

 

Part Details