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| BQ24230 Datasheet, PDF (17/33 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
500 mA
400 mA
250 mA
0 mA
400 mA
150 mA
0 mA
150 mA
0 mA
-100 mA
4 .4 V
4 .3 V
~ 3.6V
DPM loop active
Supplement
Mode
Figure 27. bq2423x DPPM and Battery Supplement Modes
(VOREG = 4.4 V, VBAT = 3.6 V, ILIM=400 mA, ICHG = 150 mA)
INPUT SOURCE NOT CONNECTED
When no source is connected to the IN input, OUT is powered strictly from the battery. During this mode, the
current into OUT is unregulated, similar to Battery Supplement Mode; however, the short-circuit circuitry is active.
If the OUT voltage falls below the BAT voltage by 250 mV for longer than tDGL(SC2), OUT is turned off. The
short-circuit recovery timer then starts counting. After tREC(SC2), OUT turns on and attempts to restart. If the
short-circuit remains, OUT is turned off and the counter restarts. This ON/OFF cycle continues until the overload
condition is removed.
BATTERY CHARGING
Set CE low to initiate battery charging. First, the device checks for a short circuit on the BAT pin by sourcing
IBAT(SC) to the battery and monitoring the voltage. When the BAT voltage exceeds VBAT(SC), the battery charging
continues. The battery is charged in three phases: conditioning precharge, constant-current fast charge (current
regulation), and a constant-voltage tapering (voltage regulation). In all charge phases, an internal control loop
monitors the IC junction temperature and reduces the charge current if an internal temperature threshold is
exceeded.
Copyright © 2008, Texas Instruments Incorporated
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Product Folder Link(s): bq24230 bq24232
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