Linear charger with regulated system voltage and LDO
The BQ25155 from Texas Instruments is a highly integrated battery charge management IC that integrates the most common functions for wearable and portable devices, namely a charger, a regulated output voltage rail for system power, ADC for battery and system monitoring, a LDO, and push-button controller.
The BQ25155 IC integrates a linear charger with PowerPath that enables quick and accurate charging for small batteries while providing a regulated voltage to the system. The regulated system voltage (PMID) output may be configured through I2C based on the recommended operating condition of downstream IC’s and system loads for optimal system operation.
The device supports charge current up to 500mA and supports termination current down to 0.5mA for maximum charge. The battery is charged using a standard Li-Ion charge profile with three phases: pre-charge, constant current and constant voltage regulation.
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