Datasheet



SLUS564C − JULY 2003 − REVISED OCTOBER 2008
23
www.ti.com
TYPICAL CHARACTERISTICS
V
VIN
= 20 V
V
VIN
= 8 V
Efficiency − %
f
OSC
= 290 kHz
V
VO1
= 5 V
Figure 20. Soft-Stop
ENBL1
5 V/div
ENBL2
5 V/div
V
OUT1
2 V/div
V
OUT2
2 V/div
t − Time − 5 ms / div
VDDQ Disabled S5
VTT Disabled S3
Figure 21. Cascade Configuration DDR Mode
Shudown
t − Time − 5 ms / div
VDDQ (1 V/div)
VTT (1 V/div)
Figure 22
0
0.1 1 100.01
20
80
40
100
60
V
VIN
= 12 V
V
VIN
= 20 V
V
VIN
= 8 V
PWM MODE EFFICIENCY
vs
OUTPUT CURRENT
I
OUT
− Output Current − A
Efficiency − %
f
OSC
= 290 kHz
V
VO1
= 5 V
Figure 23
0
0.1 1 100.01
20
80
40
100
60
AUTOSKIP MODE EFFICIENCY
vs
OUTPUT CURRENT
I
OUT
− Output Current − A
Efficiency − %
V
VIN
= 12 V
V
VIN
= 20 V
V
VIN
= 8 V
f
OSC
= 290 kHz
V
VO1
= 5 V