Datasheet

LT4254
4
4254fb
TYPICAL PERFOR A CE CHARACTERISTICS
UW
FB Pin Hysteresis vs Temperature
GATE Pin Pull-Up Current
vs Temperature
GATE Pin Pull-Down Current
vs Temperature
∆V
GATE
vs Temperature ∆V
GATE
vs V
CC
I
CC
vs Temperature
FB Pin Threshold Voltage (Low-
to-High) vs Temperature
TEMPERATURE (°C)
–50 –25
1.0
I
CC
(mA)
1.4
2.0
0
50
75
4254 G04
1.2
1.8
1.6
25
100
125
V
CC
= 36V
V
CC
= 10.8V
V
CC
= 24V
TEMPERATURE (°C)
–50
FB THRESHOLD VOLTAGE LOW-TO-HIGH (V)
4.42
4.44
4.46
25 75
4254 G05
4.40
4.38
–25 0
50 100 125
4.36
4.34
TEMPERATURE (°C)
–50
FB THRESHOLD VOLTAGE HIGH-TO-LOW (V)
4.00
4.01
4.02
25 75
4254 G06
3.99
3.98
–25 0
50 100 125
3.97
3.96
FB Pin Threshold Voltage (High-
to-Low) vs Temperature
TEMPERATURE (°C)
–50
300
FB HYSTERESIS (mV)
320
360
380
400
50
480
4254 G07
340
0
–25
75 100
25 125
420
440
460
TEMPERATURE (°C)
–50
–45
I
GATE
PULL-UP CURRENT (µA)
–40
–30
–25
–20
50
0
4254 G08
–35
0
–25
75 100
25 125
–15
–10
–5
TEMPERATURE (°C)
–50
I
GATE
PULL-DOWN CURRENT (mA)
75
25
4254 G09
60
50
–25 0 50
45
40
80
70
65
55
75 100 125
TEMPERATURE (°C)
–50
∆V
GATE
(V
GATE
– V
CC
) (V)
11
25
4254 G10
8
6
–25 0 50
5
4
12
10
9
7
75 100 125
V
CC
= 18V
V
CC
= 12V
V
CC
= 10.8V
∆V
GATE
vs Temperature
TEMPERATURE (°C)
–50
∆V
GATE
(V
GATE
– V
CC
) (V)
12.0
12.5
13.0
25 75
4254 G11
11.5
11.0
–25 0
50 100 125
10.5
10.0
V
CC
= 24V, 36V
V
CC
= 20V
V
CC
(V)
10
14
12
10
8
6
4
2
0
25 35
15 20
30 40
∆V
GATE
(V
GATE
– V
CC
) (V)
T
A
= 25°C