Battery management IC targets smart watches, wearables

15th December 2015
Mick Elliott

The bq25120 battery management IC from Texas Instruments is now being shipped by Mouser Electronics. The bq25120 requires a no-load quiescent current of just 700nA at 1.8V when the buck converter is enabled. The solution supports batteries from 3.6V to 4.65V, and fast charge currents from 5mA to 300mA, allowing wearables and industrial Internet of Things (IoT) applications to always be on without draining the battery.

The IC features a linear charger, configurable low-dropout (LDO) regulator, load switch, buck converter, pushbutton control, and battery voltage monitor in a diminutive 2.5mm2 WCSP package.

It integrates a high-efficiency, low-quiescent-current buck converter with TI’s DCS-control architecture that extends light-load efficiency down to 10-µA load currents.

Low quiescent current during operation and shutdown enables maximum battery life, and the device’s accurate charge termination down to 500 µA maximises the energy delivered to the battery before completing the charging cycle, allowing batteries to draw a more robust full charge.      

The bq25120's I2C programming interface allows designers to set key parameters including battery charger voltage, current, termination threshold, input current limit, load switch control, flexible timer, and reset options. 4The device is supported by the bq25120EVM-731 evaluation module, a high-performance, easy-to-use development kit that helps engineers design flexible power management solutions based on the onboard bq25120 IC.

The bq25120 IC and evaluation module are ideal for smartwatches and other wearable devices, health monitoring accessories, and rechargeable toys.

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