Datasheet

5
4251b12f
LTC4251B/LTC4251B-1/
LTC4251B-2
TYPICAL PERFORMANCE CHARACTERISTICS
OV Threshold vs Temperature
I
SENSE
vs Temperature
I
SENSE
vs (V
SENSE
– V
EE
)
TIMER Threshold vs Temperature
V
GATE
vs Temperature V
GATEL
vs Temperature UV Threshold vs Temperature
UV Threshold vs Temperature OV Threshold vs Temperature
UV/OV = 4V refers to UV = 4V for the LTC4251B-2.
TEMPERATURE (°C)
–55
UV THRESHOLD (V)
3.375
3.275
3.175
3.075
2.975
2.875
2.775
–15
25
45 125
4251b12 G15
–35 5
65
85
105
V
UVH
LTC4251B/LTC4251B-2
V
UVL
TEMPERATURE (°C)
–55
UV THRESHOLD (V)
2.55
2.50
2.45
2.40
2.35
2.30
2.25
2.20
2.15
2.10
2.05
–15
25
45 125
4251b12 G16
–35 5
65
85
105
V
UVHI
LTC4251B-1
V
UVLO
TEMPERATURE (°C)
–55
OV THRESHOLD (V)
6.45
6.25
6.05
5.85
5.65
5.45
5.25
–15
25
45 125
4251b12 G17
–35 5
65
85
105
V
OVH
LTC4251B
V
OVL
TEMPERATURE (°C)
–55
V
GATEL
(V)
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
–15
25
45 125
4251b12 G14
–35 5
65
85
105
UV/0V = 4V,
V
TMR
= 0V,
GATE THRESHOLD
BEFORE RAMP-UP
TEMPERATURE (°C)
–55
V
GATE
(V)
14.5
14.0
13.5
13.0
12.5
12.0
11.5
11.0
10.5
10.0
–15
25
45 125
4251b12 G13
–35 5
65
85
105
UV/0V = 4V
V
TMR
= 0V
V
SENSE
= V
EE
TEMPERATURE (°C)
–55
I
SENSE
(μA)
–10
–12
–14
–16
–18
–20
–22
–24
–26
–28
–30
–15
25
45 125
4251b12 G19
–35 5
65
85
105
UV/0V = 4V
TIMER = 0V
GATE = HIGH
V
SENSE
– V
EE
= 50mV
(V
SENSE
– V
EE
) (V)
–1.5 –1.0 –0.5 0 0.5 1.0 1.5 2.0
–I
SENSE
(mA)
0.01
0.1
1.0
10
100
1000
4251b12 G20
UV/0V = 4V
TIMER = 0V
GATE = HIGH
T
A
= 25°C
TEMPERATURE (°C)
–55
TIMER THRESHOLD (V)
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
–15
25
45 125
4251b12 G21
–35 5
65
85
105
V
TMRH
V
TMRL
TEMPERATURE (°C)
–55
OV THRESHOLD (V)
6.51
6.41
6.31
6.21
6.11
6.01
5.91
5.81
5.71
5.61
–15
25
45 125
4251b12 G18
–35 5
65
85
105
V
OVHI
V
OVLO
LTC4251B-1