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Typical perForMance characTerisTics
FB Regulation Voltage (V
vs Temperature
1.28
1.27
1.26
1.25
1.24
1.23
1.22
1.21
1.20
–50
0
25
50
–25
TEMPERATURE (°C)
Switching Frequency vs R
10000
1000
100
10
10
R
(k)
T
Quiescent Current vs V
2.0
PWM = 0V
1.5
1.0
0.5
0
0
20
40
V
(V)
IN
)
FB
V
Voltage vs Temperature
REF
2.04
2.03
2.02
2.01
2.00
1.99
1.98
1.97
1.96
–50
75
125
–25
100
3956 G04
Switching Frequency
vs Temperature
T
500
R
= 26.7k
T
450
400
350
300
100
–50
–25
3956 G07
SW Pin Current Limit
vs Temperature
IN
4.4
4.2
4.0
3.8
3.6
–50
–25
60
80
3956 G10
T
= 25°C, unless otherwise noted.
A
0
25
50
75
125
100
TEMPERATURE (°C)
3956 G05
0
25
50
75
125
100
TEMPERATURE (°C)
3956 G08
50
125
0
25
75
100
TEMPERATURE (°C)
3956 G11
LT3956
V
Voltage vs V
REF
IN
2.04
2.03
2.02
2.01
2.00
1.99
1.98
1.97
1.96
0
20
40
V
(V)
IN
EN/UVLO Hysteresis Current
vs Temperature
2.4
2.2
2.0
1.8
1.6
–50
0
25
50
75
–25
TEMPERATURE (°C)
EN/UVLO Threshold
vs Temperature
1.28
1.26
EN/UVLO RISING
1.24
EN/UVLO FALLING
1.22
1.20
1.18
–50
0
25
50
75
–25
TEMPERATURE (°C)
60
80
3956 G06
125
100
3956 G09
100
125
3956 G12
3956f
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