Datasheet

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