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| BQ24232H Datasheet, PDF (16/37 Pages) Texas Instruments – USB-Friendly Lithium-Ion Battery Charger and Power-Path Management IC | |||
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bq24230H
bq24232H
SLUSBI8 â JANUARY 2014
500 mA
400 mA
250 mA
0 mA
400 mA
150 mA
0 mA
150 mA
0 mA
-100 mA
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4 .4 V
4 .3 V
~ 3.6V
DPM loop active
Supplement
Mode
Figure 20. bq2423xH 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.
Figure 21 illustrates a normal Li-ion charge cycle using the bq2423xH:
16
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