BQ25121A Series
300-mA linear battery charger with Power Path, integrated LDO and buck converter 2.5V default output
Manufacturer: Texas Instruments
Catalog
300-mA linear battery charger with Power Path, integrated LDO and buck converter 2.5V default output
Key Features
• Increases system operation time between chargesConfigurable 300-mA buck regulator (2.5-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 µASimple voltage based battery monitorWatchdog timer disabledHighly integrated solution with small footprint2.5-mm x 2.5-mm WCSP Package and six external components for minimal solutionPush-button wake-up and reset with adjustable timersPower path management for powering the system and charging the batteryPower path management enables < 50 nA Ship Mode battery quiescent current for longest shelf lifeBattery 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 outputI2C communication controlCharge voltage and currentTermination thresholdInput current limitVINDPM ThresholdTimer optionsLoad switch controlSystem output voltage adjustmentLDO output voltage adjustmentSafety-Related Certification:TUV IEC 62368-1 CertificationIncreases system operation time between chargesConfigurable 300-mA buck regulator (2.5-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 µASimple voltage based battery monitorWatchdog timer disabledHighly integrated solution with small footprint2.5-mm x 2.5-mm WCSP Package and six external components for minimal solutionPush-button wake-up and reset with adjustable timersPower path management for powering the system and charging the batteryPower path management enables < 50 nA Ship Mode battery quiescent current for longest shelf lifeBattery 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 outputI2C communication controlCharge voltage and currentTermination thresholdInput current limitVINDPM ThresholdTimer optionsLoad switch controlSystem output voltage adjustmentLDO output voltage adjustmentSafety-Related Certification:TUV IEC 62368-1 Certification
Description
AI
The BQ25121A 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 IQswitcher 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 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(BATREG).
The BQ25121A 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 IQswitcher 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 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(BATREG).
