Datasheet

4
4251b12f
LTC4251B/LTC4251B-1/
LTC4251B-2
TYPICAL PERFORMANCE CHARACTERISTICS
Circuit Breaker Current Limit
Voltage V
CB
vs Temperature
Analog Current Limit Voltage V
ACL
vs Temperature
Fast Current Limit Voltage V
FCL
vs Temperature
I
GATE
(Source) vs Temperature I
GATE
(ACL, Sink) vs Temperature I
GATE
(FCL, Sink) vs Temperature
UV/OV = 4V refers to UV = 4V for the LTC4251B-2.
V
Z
vs Temperature
Undervoltage Lockout V
LKO
vs
Temperature
Undervoltage Lockout Hysteresis
V
LKH
vs Temperature
TEMPERATURE (°C)
–55
V
Z
(V)
14.5
14.0
13.5
13.0
12.5
12.0
–15
25
45 125
4251b12 G04
–35 5
65
85
105
I
IN
= 2mA
TEMPERATURE (°C)
–55
V
LKO
(V)
12.0
11.5
11.0
10.5
10.0
9.5
9.0
8.5
8.0
–15
25
45 125
4251b12 G05
–35 5
65
85
105
TEMPERATURE (°C)
–55
V
LKH
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
0
–15
25
45 125
4251b12 G06
–35 5
65
85
105
TEMPERATURE (°C)
–55
V
CB
(mV)
60
58
56
54
52
50
48
46
44
42
40
–15
25
45 125
4251b12 G07
–35 5
65
85
105
TEMPERATURE (°C)
–55
V
ACL
(V)
120
115
110
105
100
95
90
85
80
–15
25
45 125
4251b12 G08
–35 5
65
85
105
TEMPERATURE (°C)
–55
V
FCL
(mV)
300
275
250
225
200
175
150
–15
25
45 125
4251b12 G09
–35 5
65
85
105
TEMPERATURE (°C)
–55
I
GATE
(μA)
70
65
60
55
50
45
40
–15
25
45 125
4251b12 G10
–35 5
65
85
105
UV/0V = 4V
TIMER = 0V
V
SENSE
= V
EE
V
GATE
= 0V
TEMPERATURE (°C)
–55
I
GATE
(mA)
30
25
20
15
10
5
0
–15
25
45 125
4251b12 G11
–35 5
65
85
105
UV/0V = 4V
TIMER = 0V
V
SENSE
– V
EE
= 0.15V
V
GATE
= 3V
TEMPERATURE (°C)
–55
I
GATE
(mA)
400
350
300
250
200
150
100
50
0
–15
25
45 125
4251b12 G12
–35 5
65
85
105
UV/0V = 4V
TIMER = 0V
V
SENSE
– V
EE
= 0.3V
V
GATE
= 1V