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Texas Instruments bq25120A

700nA Low Iq Highly Integrated Battery Charge Management Solution


TopologyOther Topology
Switching frequency2000 kHz
IC revisionA


The bq25120A 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.


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 x 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

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