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SLVS456C − OCTOBER 2003 − REVISED OCTOBER 2004
MINIMUM OUTPUT VOLTAGE
MAXIMUM SWITCHING FREQUENCY
MINIMUM OUTPUT VOLTAGE
vs
vs
vs
INPUT VOLTAGE
INPUT VOLTAGE
INPUT VOLTAGE
5.5
800
5.5
V
= 3.3 V
I
= 0 A
O
V
= 2.5 V
O
I
> 0.5 A
O
O
700 kHz
600 kHz
500 kHz
400 kHz
5
5
700
600
500
400
300
200
100
4.5
4.5
4
4
3.5
3
700 kHz
3.5
600 kHz
500 kHz
3
300 kHz
2.5
2.5
400 kHz
V
6
= 1.8 V
O
2
2
V
= 1.5 V
O
1.5
1.5
V
= 0.9 V
O
1
V
= 1.2 V
1
0.5
0
O
0.5
200 kHz
6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
300 kHz
I
> 0.5 A
200 kHz
O
0
0
5
10 11 12 13 14 15 16 17 18 19 20
7 8 9
5
5
6
7
8
9 10 11 12 13 14 15 16 17 18 19 20
V − Input Voltage − V
I
V − Input Voltage − V
I
V − Input Voltage − V
I
Figure 29
Figure 30
Figure 31
VIN(UVLO) START AND STOP
vs
FREE-AIR TEMPERATURE
RT RESISTANCE
vs
SWITCHING FREQUENCY
MAXIMUM SWITCHING FREQUENCY
vs
INPUT VOLTAGE
800
4.5
4.3
4.1
3.9
3.7
3.5
225
200
175
150
125
100
75
T
J
= 25°C
V
= 1.8 V
O
V
= 2.5 V
O
700
600
500
400
300
200
100
0
V
= 3.3 V
O
Start
Stop
V
= 0.9 V
O
V
= 1.2 V
O
V
= 1.5 V
O
I
< 0.1 A
O
50
200
−50 −25
0
25 50 75 100 125 150
300
400
500
600
700
5
6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
T
A
− Free-Air Temperature − 5C
Switching Frequency − kHz
V − Input Voltage − V
I
Figure 32
Figure 33
Figure 34
ENABLED SUPPLY CURRENT
DISABLED SUPPLY CURRENT
BIAS VOLTAGE
vs
INPUT VOLTAGE
vs
vs
INPUT VOLTAGE
INPUT VOLTAGE
10
9
1.3
1.2
1.1
1.0
0.9
8.0
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0
T
f
= 25°C
= 500 kHz
J
S
T
J
= 25°C
T
J
= 25°C
8
7
6
5
4
3
0
5
10
15
20
25
0
5
10
15
20
25
0
5
10
15
20
25
V − Input Voltage − V
I
V − Input Voltage − V
I
V − Input Voltage − V
I
Figure 35
Figure 36
Figure 37
22
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