BQ24153 Datasheet, PDF (16/40 Pages) Texas Instruments – Fully Integrated Switch-Mode One-Cell Li-Ion Charger With Full USB Compliance and USB-OTG Support

bq24153
bq24156, bq24158
SLUSA27 – MARCH 2010
www.ti.com
The bq24153/8 have three operation modes: charge mode, boost mode, and high impedance mode, while
bq24156 only has charge mode and high impedance mode. In charge mode, the IC supports a precision Li-ion or
Li-polymer charging system for single-cell applications. In boost mode, the IC boosts the battery voltage to VBUS
for powering attached OTG devices. In high impedance mode, the IC stops charging or boosting and operates in
a mode with very low current from VBUS or battery, to effectively reduce the power consumption when the
portable device is in standby mode. Through the proper control, the IC achieves the smooth transition among the
different operation modes.
CHARGE MODE OPERATION
Charge Profile
In charge mode, the IC has five control loops to regulate input voltage, input current, charge current, charge
voltage and device junction temperature. During the charging process, all five loops are enabled and the one that
is dominant takes control. The IC supports a precision Li-ion or Li-polymer charging system for single-cell
applications. Figure 26 (a) indicates a typical charge profile without input current regulation loop. It is the
traditional CC/CV charge curve, while Figure 26(b) shows a typical charge profile when input current limiting loop
is dominant during the constant current mode. In this case, the charge current is higher than the input current so
the charge process is faster than the linear chargers. For bq24153/6/8, the input voltage threshold for DPM loop,
input current limits, the charge current, termination current, and charge voltage are all programmable using I²C
interface.
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