LT4256-1/LT4256-2
2
425612fa
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
(Note 1)
Supply Voltage (V
CC
) ................................ 0.3 to 100V
SENSE, PWRGD ....................................... 0.3 to 100V
GATE (Note 2) ................................ 0.3V to V
CC
+ 10V
Maximum Input Current (GATE) ......................... 200礎
FB, UV ........................................................ 0.3 to 44V
TIMER ..................................................... 0.3V to 4.3V
Maximum Input Current (TIMER) ....................... 100礎
Operating Temperature
LT4256C................................................. 0癈 to 70癈
LT4256I ............................................. 40癈 to 85癈
Storage Temperature Range ................ 65癈 to 150癈
Lead Temperature (Soldering, 10 sec)................. 300癈
ABSOLUTE   AXI  U   RATI  GS
W
W
U
Consult LTC Marketing for parts specified with wider operating temperature ranges.
PACKAGE/ORDER I  FOR  ATIO
U
W
ORDER PART
NUMBER
S8 PART MARKING
42561
42561I
42562
42562I
LT4256-1CS8
LT4256-1IS8
LT4256-2CS8
LT4256-2IS8
T
JMAX
= 125癈, ?/DIV>
JA
= 110癈/W
ELECTRICAL CHARACTERISTICS  The ?/SPAN> denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25?/SPAN>C. V
CC
= 48V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V
CC
Operating Voltage
?/DIV>
10.8
80
V
I
CC
Operating Current
1.8
3.9
mA
V
UVLH
Undervoltage Threshold
V
CC
Low-to-High Transition
?/DIV>
3.96
4
4.04
V
V
UVHYS
Hysteresis
0.25
0.4
0.55
V
I
INUV
UV Input Current
UV e 1.2V
0.1
1
礎
UV = 0V
1.5
3
礎
V
UVRTH
Fault Latch Reset Threshold Voltage
?/DIV>
0.4
0.85
1.2
V
V
SENSETRIP
SENSE Pin Trip Voltage (V
CC
V
SENSE
)
FB = 0V
?/DIV>
5.5
14
22
mV
FB e 2V
?/DIV>
45
55
65
mV
I
INSNS
SENSE Pin Input Current
V
SENSE
= V
CC
40
70
礎
I
PU
GATE Pull-Up Current
Charge Pump On, V
GATE
= 7V
?/DIV>
16
32
63
礎
I
PD
GATE Pull-Down Current
Any Fault, V
GATE
= 3V
40
62
80
mA
V
GATE
External N-Channel Gate Drive (Note 2)
V
GATE
V
CC
, 10.8V d V
CC
d 20V
?/DIV>
4.5
8.8
12.5
V
20V d V
CC
d 80V
?/DIV>
10
11.6
12.8
V
V
FB
FB Voltage Threshold
FB High-to-Low Transition
?/DIV>
3.95
3.99
4.03
V
FB Low-to-High Transition
?/DIV>
4.2
4.45
4.65
V
V
FBHYS
FB Hysteresis Voltage
0.3
0.45
0.6
V
V
OLPGD
PWRGD Output Low Voltage
I
O
= 1.6mA
0.25
0.4
V
I
O
= 5mA
0.6
1
V
I
PWRGD
PWRGD Pin Leakage Current
V
PWRGD
= 80V
0.1
1
礎
I
INFB
FB Input Current
FB = 4.5V
0.1
1
礎
I
TIMERPU
TIMER Pull-Up Current
TIMER = 3V, During Fault
?/DIV>
63
105
147
礎
I
TIMERPD
TIMER Pull-Down Current
TIMER = 3V
?/DIV>
1.5
3
5
礎
V
THTIMER
TIMER Shut-Down Threshold
C
TIMER
= 10nF
?/DIV>
4.3
4.65
5
V
D
TIMER
Duty Cycle (RETRY Mode)
?/DIV>
1.5
3
4.5
%
1
2
3
4
8
7
6
5
TOP VIEW
V
CC
SENSE
GATE
TIMER
UV
FB
WRGD
GND
S8 PACKAGE
-LEAD PLA TI
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