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BQ24150A Datasheet, PDF (14/41 Pages) Texas Instruments – Fully Integrated Switch-Mode One-Cell Li-Ion Charger With Full USB Compliance and USB-OTG Support
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bq24150A
bq24151A
SLUS931 – APRIL 2009 ..................................................................................................................................................................................................... www.ti.com
DETAILED FUNCTIONAL DESCRIPTION
For a current limited power source, such as a USB host or hub, the high efficiency converter is critical in fully
using the input power capacity and charging the battery. Due to the high efficiency in a wide range of the input
voltage and battery voltage, the switching mode charger is a good choice for high speed charging with less
power loss and better thermal management.
The bq24150A/1A is a highly integrated synchronous switch-mode charger with bi-directional operation to
achieve boost function for USB OTG support, featuring integrated MOSFETs and small external components,
targeted at extremely space-limited portable applications powered by 1-cell Li-Ion or Li-polymer battery pack.
The bq24150A/1A usually has three operation modes: charge mode, boost mode, and high impedance mode. In
charge mode, the bq24150A/1A supports a precision Li-ion or Li-polymer charging system for single-cell
applications. In boost mode, bq24150A/1A boosts the battery voltage to VBUS for powering attached OTG
devices. In high impedance mode, the bq24150A/1A stops charging or boosting and operates in a mode with low
current from VBUS or battery, to effectively reduce the power consumption when the portable device in standby
mode. Through the proper control, bq24150A/1A can achieve the smooth transition among different operation
modes.
CHARGE MODE OPERATION
Charge Profile
In charge mode, bq24150A/1A has four control loops to regulate input current, charge current, charge voltage
and device junction temperature, as shown in Figure 21. During the charging process, all four loops are enabled
and the one that is dominant will take over the control. The bq24150A/1A supports a precision Li-ion or
Li-polymer charging system for single-cell applications. Figure 24(a) indicates a typical charge profile without
input current regulation loop and it is similar to the traditional CC/CV charge curve, while Figure 24(b) shows a
typical charge profile when input current limiting loop is dominant during the constant current mode, and in this
case the charge current is higher than the input current so the charge process is faster than the linear chargers.
For bq24150A/1A, the input current limits, the charge current, termination current, and charge voltage are all
programmable using I2C interface.
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