BQ24262_15 Datasheet, PDF (13/56 Pages) Texas Instruments – bq2426x 3-A, 30-V, Host-Controlled Single-Input, Single-Cell Switched-Mode Li-Ion Battery Charger With Power-Path Management and USB-OTG Support

Not Recommended for New Designs : bq24260, bq24261
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9 Detailed Description
bq24260, bq24261, bq24261M, bq24262
SLUSBU4D – DECEMBER 2013 – REVISED APRIL 2015
9.1 Overview
The bq24260/1/1M/2 is a highly integrated single-cell Li-Ion battery charger and system power-path management
device 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 power-path management feature allows the bq24260/1/1M/2 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 or the adapter cannot support the required load, causing the adapter voltage to fall (V_{IN_DPM}). This
allows for proper charge termination and timer operation. The system voltage is regulated to the battery voltage
but will not drop below 3.5 V (V_MINSYS). This minimum system voltage support enables the system to run with a
defective or absent battery pack and 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. The power-path feature coupled with
V_IN-DPM, enables the use of many adapters with no hardware change. The charge parameters are
programmable using the I²C interface. To support USB OTG applications, the bq24260/1/1M/2 is configurable to
boost the battery voltage to 5 V at the input. In this mode, the bq24260/1/1M/2 supplies up to 1 A and operates
with battery voltages down to 3.3 V.
The battery is charged using a standard Li-Ion charge profile with three phases: precharge, constant current, and
constant voltage. In all charge phases, an internal control loop monitors the IC junction temperature and reduces
the input current to prevent the junction temperature from rising above 125°C. Additionally, 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.
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Product Folder Links: bq24260 bq24261 bq24261M bq24262