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| BQ24075T Datasheet, PDF (16/29 Pages) Texas Instruments – 1.5A USB-Friendly Li-Ion Battery Charger and Power-Path Management IC | |||
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bq24075T
bq24079T
SLUS937 â DECEMBER 2009
www.ti.com
5.5 V
Figure 26. DPPM and Battery Supplement Modes
(VOREG = 5.5V, VBAT = 3.6V)
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 not regulated, similar to Battery Supplement Mode, however the short circuit circuitry is
active. If the OUT voltage falls below the BAT voltage by 250mV 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 pre-charge, 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.
16
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