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LT4356-1/LT4356-2
ELECTRICAL CHARACTERISTICS
The l denotes the speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T A = 25°C. V CC = 12V unless otherwise noted.
SYMBOL
V CC
I CC
PARAMETER
Operating Voltage Range
V CC Supply Current
CONDITIONS
V SHDN = Float
V SHDN = 0V, IN + = 1.3V, LT4356-1
LT4356I-1, LT4356C-1
LT4356H-1
V SHDN = 0V, IN + = 1.3V, LT4356-2
LT4356I-2, LT4356C-2
LT4356H-2
l
l
l
l
l
l
MIN
4
TYP
1
7
7
7
60
60
60
MAX
80
1.5
25
30
40
70
100
250
UNITS
V
mA
μA
μA
μA
μA
μA
μA
I R
Δ V GATE
Reverse Input Current
GATE Pin Output High Voltage
V SNS = V CC = –30V, SHDN Open
V SNS = V CC = V SHDN = –30V
V CC = 4V; (V GATE – V OUT )
80V ≥ V CC ≥ 8V; (V GATE – V OUT )
l
l
l
l
4.5
10
0.3
0.8
1
2
8
16
mA
mA
V
V
I GATE(UP)
I GATE(DN)
V FB
I FB
Δ V SNS
I SNS
I LEAK
GATE Pin Pull-Up Current
GATE Pin Pull-Down Current
FB Pin Servo Voltage
FB Pin Input Current
Overcurrent Fault Threshold
SNS Pin Input Current
FLT , EN Pins Leakage Current
V GATE = 12V; V CC = 12V
V GATE = 48V; V CC = 48V
Overvoltage, V FB = 1.4V, V GATE = 12V
Overcurrent, V CC – V SNS = 120mV, V GATE = 12V
Shutdown Mode, V SHDN = 0V, V GATE = 12V
V GATE = 12V; V OUT = 12V, LT4356I, LT4356C
V GATE = 12V; V OUT = 12V, LT4356H
V FB = 1.25V
Δ V SNS = (V CC – V SNS ), V CC = 12V, LT4356I, LT4356C
Δ V SNS = (V CC – V SNS ), V CC = 12V, LT4356H
Δ V SNS = (V CC – V SNS ), V CC = 48V, LT4356I, LT4356C
Δ V SNS = (V CC – V SNS ), V CC = 48V, LT4356H
V SNS = V CC = 12V to 48V
FLT , EN = 80V
l
l
l
l
l
l
l
l
l
l
l
l
l
l
–4
–4.5
75
5
1.5
1.225
1.215
45
42.5
46
43
5
–23
–30
150
10
5
1.25
1.25
0.3
50
50
51
51
10
–36
–50
1.275
1.275
1
55
55
56
56
22
2.5
μA
μA
mA
mA
mA
V
V
μA
mV
mV
mV
mV
μA
μA
A OUT Pin Leakage Current
A OUT = 80V
4.5
μA
I TMR
V TMR
Δ V TMR
V IN+
I IN+
I OUT
Δ V OUT
V SHDN
V OL
TMR Pin Pull-up Current
TMR Pin Pull-down Current
TMR Pin Thresholds
Early Warning Period
IN + Pin Threshold
IN + Pin Input Current
OUT Pin Input Current
OUT Pin High Threshold
SHDN Pin Threshold
FLT , EN Pins Output Low
A OUT Pin Output Low
V TMR = 1V, V FB = 1.5V, (V CC – V OUT ) = 0.5V
V TMR = 1V, V FB = 1.5V, (V CC – V OUT ) = 75V
V TMR = 1.3V, V FB = 1.5V
V TMR = 1V, Δ V SNS = 60mV, (V CC – V OUT ) = 0.5V
V TMR = 1V, Δ V SNS = 60mV, (V CC – V OUT ) = 80V
V TMR = 1V, V FB = 1V, Δ V SNS = 0V
FLT From High to Low, V CC = 5V to 80V
V GATE From Low to High, V CC = 5V to 80V
From FLT going Low to GATE going Low, V CC = 5V to 80V
V IN+ = 1.25V
V OUT = V CC = 12V
V OUT = V CC = 12V, V SHDN = 0V
Δ V OUT = V CC – V OUT ; EN From Low to High
V CC = 12V to 48V
I SINK = 2mA
I SINK = 0.1mA
I SINK = 2mA
I SINK = 0.1mA
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
–1.5
–44
–3.5
–2.5
–195
1.5
1.22
0.48
80
1.22
0.25
0.6
0.4
–2.5
–50
–5.5
–4.5
–260
2.2
1.25
0.5
100
1.25
0.3
200
6
0.5
1.4
2
300
2
200
–4
–56
–8.5
–6.5
–315
2.7
1.28
0.52
120
1.28
1
300
14
0.7
1.7
2.1
8
800
8
400
μA
μA
μA
μA
μA
μA
V
V
mV
V
μA
μA
mA
V
V
V
V
mV
V
mV
4356fa
4
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