BQ24161B_15 Datasheet, PDF (12/52 Pages) Texas Instruments – bq2416xx 2.5A, Dual-Input, Single-Cell Switched-Mode Li-Ion Battery Charger with Power Path Management and I2C Interface

bq24160, bq24160A, bq24161
bq24161B, bq24163, bq24168
SLUSAO0F – NOVEMBER 2011 – REVISED JULY 2014
9 Detailed Description
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9.1 Overview
The bq24160/bq24160A/bq24161/bq24161B/bq24163/bq24168 devices are highly integrated single-cell Li-Ion
battery chargers and system power path management devices targeted for space-limited, portable applications
with high-capacity batteries. The dual-input, single-cell charger operates from either a USB port or alternate
power source (that is, wall adapter or wireless power input) for a versatile solution.
The power path management feature allows the bq2416xx to power the system from a high-efficiency DC-DC
converter while simultaneously and independently charging the battery. The charger monitors the battery current
at all times and reduces the charge current when the system load requires current above the input current limit.
This allows proper charge termination and enables the system to run with a defective or absent battery pack.
Additionally, this enables instant system turnon even with a totally discharged battery or no battery. The power-
path management architecture also permits the battery to supplement the system current requirements when the
adapter cannot deliver the peak system currents. This enables the use of a smaller adapter. The 2.5-A current
capability allows for GSM phone calls as soon as the adapter is plugged in regardless of the battery voltage. The
charge parameters are programmable using the I²C interface.
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