Datasheet

Typical performance characteristics ST1S09
10/18 Doc ID 13632 Rev 4
Figure 15. Efficiency vs. temperature Figure 16. Over voltage protection vs.
temperature
Figure 17. Over voltage protection vs.
temperature
Figure 18. Over voltage protection hyst. vs.
temperature
Figure 19. Load transient Figure 20. Inhibit transient
V
I
= 5 V, V
O
= 1.2 V, I
O
= 100 mA to1 A, L = 3.3 µH,
C
I
= 4.7 µF, C
O
= 22 µF
V
I
= 5V, V
INH
= 0 to 2 V, I
O
= 2 A, L = 3.3 µH, C
I
= 4.7 µF,
C
O
= 22 µF, V
O
= 3.3 V
40
45
50
55
60
65
70
75
80
85
90
95
100
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
Efficiency [%]
V
O
=1.2V
V
O
=3.3V
V
I
=5V, I
O
=100mA
40
45
50
55
60
65
70
75
80
85
90
95
100
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
Efficiency [%]
V
O
=1.2V
V
O
=3.3V
V
I
=5V, I
O
=100mA
V
SW
=1.2V
0.8
0.9
1
1.1
1.2
1.3
1.4
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
OVP %V
O
OVP ON
V
I
=5V, V
O
=3.3V, C
FB
=100nF
Resistor 1.2kΩ from V
I
and V
SW
V
SW
=1.2V
0.8
0.9
1
1.1
1.2
1.3
1.4
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
OVP %V
O
OVP ON
V
I
=5V, V
O
=3.3V, C
FB
=100nF
Resistor 1.2kΩ from V
I
and V
SW
0.8
0.9
1
1.1
1.2
1.3
1.4
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
OVP %V
O
V
SW
=0.8V V
I
=5V, V
O
=3.3V, C
FB
=100nF
Resistor 1.2kΩ from V
I
and V
SW
OVP ON
0.8
0.9
1
1.1
1.2
1.3
1.4
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
OVP %V
O
V
SW
=0.8V V
I
=5V, V
O
=3.3V, C
FB
=100nF
Resistor 1.2kΩ from V
I
and V
SW
OVP ON
0
2
4
6
8
10
12
14
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
OVP % Hysteresis
V
SW
=0.8V V
I
=5V, V
O
=3.3V, C
FB
=100nF
Resistor 1.2kΩ from V
I
and V
SW
OVP ON
0
2
4
6
8
10
12
14
-75 -50 -25 0 25 50 75 100 125 150 175
T [°C]
OVP % Hysteresis
V
SW
=0.8V V
I
=5V, V
O
=3.3V, C
FB
=100nF
Resistor 1.2kΩ from V
I
and V
SW
OVP ON
V
O
I
O
V
O
I
O
V
INH
V
O
I
O
V
INH
V
O
I
O