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| BQ24315 Datasheet, PDF (6/20 Pages) Texas Instruments – OVERVOLTAGE AND OVERCURRENT PROTECTION IC AND Li+ CHARGER FRONT-END PROTECTION IC | |||
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bq24315
SLUS817 â MARCH 2008
www.ti.com
TYPICAL OPERATING PERFORMANCE
Test conditions (unless otherwise noted) for typical operating performance: VIN = 5 V, CIN = 1 µF, COUT = 1 µF,
R(ILIM) = 25 kâ¦, RBAT = 100 kâ¦, TA = 25°C, VPU = 3.3V (see Figure 20 for the Typical Application Circuit)
NORMAL POWER-ON SHOWING SOFT-START
OVP AT POWER-ON
2 V/div
VIN
ROUT = 6.6 W
5 V/div
VIN = 0 V to 9 V,
tr = 50 ms
VIN
2 V/div
VOUT
200 mV/div
VOUT
200 mA/div
IIN
t - Time - 2 ms/div
Figure 2.
OVP RESPONSE FOR INPUT STEP
VIN = 5 V to 12 V step
5 V/div
VIN
2 V/div
VOUT
200 mA/div
IIN
t - Time - 2 ms/div
Figure 3.
OVP RESPONSE FOR INPUT STEP
5 V/div
VIN = 5 V to 12 V,
tr = 20 ms
VIN
2 V/div
VOUT
t - Time - 10 ms/div
Figure 4.
VIN
2 V/div
RECOVERY FROM OVP
VIN = 7.5 V to 5 V,
tr = 1.2 ms
2 V/div
VOUT
t - Time - 4 ms/div
Figure 6.
t - Time - 20 ms/div
Figure 5.
OCP, POWERING UP INTO A SHORT CIRCUIT ON
OUT,COUNTER COUNTS TO 15 BEFORE SWITCHING OFF
THE DEVICE
5 V/div
VIN
1 V/div
VOUT
500 mA/div
IIN
1 V/div
VFAULT
t - Time - 200 ms/div
Figure 7.
6
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