LTC4251B_15 Datasheet, PDF (4/24 Pages) Linear Technology – Negative Voltage Hot Swap Controllers in SOT-23

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