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| BQ24230 Datasheet, PDF (13/33 Pages) Texas Instruments – USB-FRIENDLY LITHIUM-ION BATTERY CHARGER AND POWER-PATH MANAGEMENT IC | |||
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bq24230
bq24232
www.ti.com .......................................................................................................................................... SLUS821A â OCTOBER 2008 â REVISED DECEMBER 2008
Turn
Q2 OFF
tREC(SC2)
Force
Q2 ON
Turn
Q2 OFF
tREC(SC2)
Force
Q2 ON
VBAT - VOUT
VO(SC2)
Recover
t < tDGL(SC2) tDGL(SC2)
tDGL(SC2)
t < tDGL(SC2)
Figure 23. OUT Short-Circuit â Supplement Mode
VCOLD
VCOLD - Vhys(COLD)
VHOT - Vhys(HOT)
VHOT
VTS
t < tDGL(TS)
tDGL(TS)
Suspend
Charging
Resume
Charging
Figure 24. Battery Pack Temperature Sensing â TS Pin. Battery Temperature Increasing
DETAILED FUNCTIONAL DESCRIPTION
The bq2423x devices are integrated Li-ion linear chargers and system power-path management devices targeted
at space-limited portable applications. The device powers the system while simultaneously and independently
charging the battery. This feature reduces the number of charge and discharge cycles on the battery, allows for
proper charge termination, and enables the system to run with a defective or absent battery pack. It also allows
instant system turnon even with a totally discharged battery. The input power source for charging the battery and
running the system can be an AC adapter or a USB port. The devices feature dynamic power-path management
(DPPM), which shares the source current between the system and battery charging and automatically reduces
the charging current if the system load increases. When charging from a USB port, the input dynamic power
management (VIN-DPM) circuit reduces the input current limit if the input voltage falls below a threshold,
preventing the USB port from crashing. The power-path architecture also permits the battery to supplement the
system current requirements when the adapter cannot deliver the peak system currents.
Copyright © 2008, Texas Instruments Incorporated
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Product Folder Link(s): bq24230 bq24232
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