BQ24187 Datasheet, PDF (11/44 Pages) Texas Instruments – 1A USB-OTG Support

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8 Detailed Description
Not Recommended for New Designs
bq24187
SLUSBM0 – APRIL 2014
8.1 Overview
The bq24187 is a highly integrated single cell Li-Ion battery charger targeted for space-limited, portable
applications with high capacity batteries. The single cell charger has a single input that supports operation from
either a USB port or wall adapter supply for a versatile solution. The integrated sense element reduces solution
size and external component count. The charge parameters are programmable using the I2C interface. To
Support USB OTG applications, the bq24187 is configurable to boost the battery voltage to 5V at the input. In
this mode, the bq24187 supplies up to 1A and operates with battery voltages down to 3.3V. The battery is
charged in three phases: precharge, fast charge constant current and constant voltage. In all charge phases, an
internal control loop monitors the IC junction temperature and reduces the charge current if the internal
temperature threshold is exceeded. Additionally, a voltage-based, JEITA compatible battery pack thermistor
monitoring input (TS) is included that monitors battery temperature for safe charging.
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