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Texas Instruments BQ25120

bq25120 700-nA Low IQ Highly Integrated Battery Charge Management Solution for Wearables and IoT


TopologyBuck Converter
Input voltage3.4-20 V
Switching frequency3000 kHz
Output 11.8 V / 0.3 A
IC revisionA


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 mutliple 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(BATREG).


  • Increases System Operation Time BetweenCharges
  • Configurable 300-mA Buck Regulator(1.8-V Default)
  • 700 nA (typical) Iq with Buck ConverterEnabled (No Load)
  • Configurable Load Switch or 100mA LDOOutput (Load Switch by Default)
  • Up to 300-mA Charge Current for FastCharging
  • 0.5% Accurate Battery Voltage Regulation(Configurable from 3.6 V to 4.65 V in 10-mVSteps)
  • Configurable Termination Current Down to500 µA
  • Simple Voltage Based Battery Monitor
  • Highly Integrated Solution with Small Footprint
  • 2.5 mm × 2.5 mm WCSP Package and 6External Components for Minimal Solution
  • Push-Button Wake-Up and Reset withAdjustable Timers
  • Power Path Management for Powering theSystem and Charging the Battery
  • Power Path Management enables <50 nA ShipMode Battery Quiescent Current for LongestShelf Life
  • Battery Charger Operates from 3.4 V – 5.5 VIN(5.5-V OVP / 20-V Tolerant)
  • Dedicated Pins for Input Current Limit, ChargeCurrent, Termination Current, and StatusOutput
  • 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

Typical applications

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