Datasheet


SLVS426 − MAY 2002
www.ti.com
24
Figure 22
0
20
40
60
80
100
0.01 0.1 1 10
V
IN
= 8 V
V
IN
= 12 V
V
IN
= 20 V
I
O
− Output Current − A
Efficiency (AUTO SKIP MODE) − %
EFFICIENCY (AUTO SKIP MODE)
vs
OUTPUT CURRENT
SBRC CH1
External 5 V
V
O
1 = 3.3 V
Figure 23
0
20
40
60
80
100
0.01 0.1 1 10
I
O
− Output Current − A
Efficiency (AUTO SKIP MODE) − %
EFFICIENCY (AUTO SKIP MODE)
vs
OUTPUT CURRENT
SBRC CH2
External 5 V
V
O
2 = 5 V
V
IN
= 8 V
V
IN
= 12 V
V
IN
= 20 V
Figure 24
0
20
40
60
80
100
0.01 0.1 1 10
I
O
− Output Current − A
Efficiency (AUTO SKIP MODE) − %
EFFICIENCY (AUTO SKIP MODE)
vs
OUTPUT CURRENT
SBRC CH3
External 5 V
V
O
3 = 1.8 V
V
IN
= 8 V
V
IN
= 12 V
V
IN
= 20 V
Figure 25
3.260
3.262
3.264
3.266
3.268
3.270
5101520
V
I
− Input Voltage − V
− Output Voltage − V
SBRC CH1 OUTPUT LINE REGULATION
I
O
= 4 A
V
O
Figure 26
5101520
V
I
− Input Voltage − V
− Output Voltage − V
SBRC CH2 OUTPUT LINE REGULATIO
N
I
O
= 4 A
V
O
4.994
4.996
4.998
5
5.002
5.004
Figure 27
5101520
V
I
− Input Voltage − V
− Output Voltage − V
SBRC CH3 OUTPUT LINE REGULATION
I
O
= 6 A
V
O
1.756
1.758
1.760
1.762
1.764
1.766
Figure 28
5101520
V
I
− Input Voltage − V
− Output Voltage − V
LDO OUTPUT LINE REGULATION
V
(LDO_IN
= V
O
3
I
O
= 3 A
V
O
1.454
1.456
1.458
1.460
1.462
1.464
Figure 29
3.260
3.265
3.270
3.275
3.280
3.285
3.290
01234
I
O
− Output Current − A
− Output Voltage − V
SBRC CH1 OUTPUT LOAD REGULATIO
N
V
O
PWM Mode
V
IN
= 12 V
Figure 30
01234
I
O
− Output Current − A
− Output Voltage − V
SBRC CH2 OUTPUT LOAD REGULATION
V
O
PWM Mode
V
IN
= 12 V
5
5.005
5.010
5.015
5.020
5.025
5.030
5