Datasheet

LTC4252B-1/LTC4252B-2
LTC4252C-1/LTC4252C-2
7
4252b12f
TYPICAL PERFORMANCE CHARACTERISTICS
OV Threshold vs Temperature I
SENSE
vs Temperature I
SENSE
vs (V
SENSE
– V
EE
)
TIMER Threshold
vs Temperature
I
TMR
(Initial Cycle, Sourcing)
vs Temperature
I
TMR
(Initial Cycle, Sinking)
vs Temperature
V
GATEH
vs Temperature V
GATEL
vs Temperature UV Threshold vs Temperature
TEMPERATURE (°C)
–55 –35 –15 5 25 45 65 85 105 125
V
GATEH
(V)
4252B12 G19
3.6
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
V
GATEH
= V
IN
– V
GATE
,
I
IN
= 2mA
(MS ONLY)
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
4252B12 G20
–35 5
65
85
105
UV/0V = 4V
TIMER = 0V
GATE THRESHOLD
BEFORE RAMP-UP
TEMPERATURE (°C)
–55
UV THRESHOLD (V)
3.375
3.275
3.175
3.075
2.975
2.875
2.775
–15
25
45 125
4252B12 G21
–35 5
65
85
105
V
UVH
V
UV
V
UVL
TEMPERATURE (°C)
–55
OV THRESHOLD (V)
6.45
6.25
6.05
5.85
5.65
5.45
5.25
5.05
4.85
–15
25
45 125
4252B12 G22
–35 5
65
85
105
V
OVH
V
OVL
V
OV
TEMPERATURE (°C)
–55
I
SENSE
(A)
–10
–12
–14
–16
–18
–20
–22
–24
–26
–28
–30
–15
25
45 125
4252B12 G23
–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
4252B12 G24
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
4252B12 G25
–35 5
65
85
105
V
TMRH
V
TMRL
TEMPERATURE (°C)
–55
I
TMR
(µA)
10
9
8
7
6
5
4
3
2
1
0
–15
25
45 125
4252B12 G26
–35 5
65
85
105
TIMER = 2V
TEMPERATURE (°C)
–55
I
TMR
(mA)
50
45
40
35
30
25
20
15
10
–15
25
45 125
4252B12 G27
–35 5
65
85
105
TIMER = 2V