All trademarks are the property of their respective owners.
DescriptionThe bq25120A is a highly integrated battery charge management IC that integratesthe 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 highefficiency, low IQ switcher using DCS control that extends light loadefficiency down to 10-μA load currents. The low quiescent current during operation and shutdownenables maximum battery life. The device supports charge currents from 5 mA to 300 mA. The inputcurrent limit, charge current, buck converter output voltage, LDO output voltage, and otherparameters 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 packthermistor monitoring input (TS) is included that monitors battery temperature and automaticallychanges charge parameters to prevent the battery from charging outside of its safe temperaturerange. The charger is optimized for 5-V USB input, with 20-V tolerance to withstand linetransients. The buck converter is run from the input or battery. When in battery only mode, thedevice can run from a battery up to 4.65 V.
A configurable load switch allows system optimization by disconnecting infrequently useddevices. The manual reset with timer allows mutliple different configuration options for wake arereset optimization.
Feature
- Increases System Operation TimeBetween Charges
- Configurable 300-mABuck 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 BatteryMonitor
- Highly Integrated Solution with SmallFootprint
- 2.5 mm x 2.5 mm WCSP Package and 6 External Components for MinimalSolution
- Push-ButtonWake-Up and Reset withAdjustable Timers
- Power Path Management forPowering the System and Charging the Battery
- PowerPath Management enables <50nA Ship Mode Battery Quiescent Current for Longest ShelfLife
- Battery Charger Operates from 3.4 V – 5.5VIN (5.5-V OVP / 20-V Tolerant)
- Dedicated Pins for Input Current Limit, ChargeCurrent, Termination Current, and Status Output
- I2C Communication Control
- Charge Voltage andCurrent
- Termination Threshold
- Input CurrentLimit
- VINDPM Threshold
- Timer Options
- Load Switch Control
- Controls for Interrupts for Faults andStatus
- System Output Voltage Adjustment
- LDO Output VoltageAdjustment
All trademarks are the property of their respective owners.
DescriptionThe bq25120A is a highly integrated battery charge management IC that integratesthe 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 highefficiency, low IQ switcher using DCS control that extends light loadefficiency down to 10-μA load currents. The low quiescent current during operation and shutdownenables maximum battery life. The device supports charge currents from 5 mA to 300 mA. The inputcurrent limit, charge current, buck converter output voltage, LDO output voltage, and otherparameters 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 packthermistor monitoring input (TS) is included that monitors battery temperature and automaticallychanges charge parameters to prevent the battery from charging outside of its safe temperaturerange. The charger is optimized for 5-V USB input, with 20-V tolerance to withstand linetransients. The buck converter is run from the input or battery. When in battery only mode, thedevice can run from a battery up to 4.65 V.
A configurable load switch allows system optimization by disconnecting infrequently useddevices. The manual reset with timer allows mutliple different configuration options for wake arereset optimization.
