LT4356CDE-1-PBF LINER [Linear Technology], LT4356CDE-1-PBF Datasheet - Page 7

• Manufacturer Part Number: LT4356CDE-1-PBF
• Description: Overvoltage Protection Regulator and Inrush Limiter
• Manufacturer: LINER [Linear Technology]

nal current source to turn the part back on. The leakage
current to ground at the pin should be limited to no more
than 1μA if no pull up device is used to turn the part on.
The SHDN pin can be pulled up to 100V or below GND by
60V without damage.
SNS (Pin 5/Pin 4): Current Sense Input. Connect this pin
to the output of the current sense resistor. The current
limit circuit controls the GATE pin to limit the sense voltage
between V
sense amplifi er also starts a current source to charge up
the TMR pin. This pin can be pulled below GND by up to
60V, though the voltage difference with the V
be limited to less than 30V. Connect to V
TMR (Pin 1/Pin 10): Fault Timer Input. Connect a ca-
pacitor between this pin and ground to set the times for
early warning, fault and cool down periods. The current
BLOCK DIAGRAM
CC
and SNS pins to 50mV. At the same time the
SHDN
A
IN
OUT
+
50mV
–
+
–
+
+
V
AUXILLARY
AMPLIFIER
IA
CC
1.25V
–
+
–
SNS
2μA
CC
0.5V
if unused.
CC
pin must
V
CHARGE
PUMP
CC
TMR
I
TMR
1.35V
1.25V
GATE
SHDN
RESTART
–
+
+
–
charging up this pin during fault conditions depends on
the voltage difference between the V
When V
dicate the detection of a fault condition. If the condition
persists, the pass transistor turns off when V
the threshold of 1.35V. The pull up current stops and
a 2μA current source starts to pull the TMR pin down
as soon as the fault condition disappears. When V
reaches the retry threshold of 0.5V, the GATE pin pulls
high turning back on the pass transistor.
V
positive supply input ranges from 4V to 80V for normal
operation. It can also be pulled below ground potential
by up to 60V during a reverse battery condition, without
damaging the part. The supply current is reduced to 7μA
with all the functional blocks off.
14V
OC
CC
(Pin 6/Pin 5): Positive Supply Voltage Input. The
CONTROL
GATEOFF
LOGIC
OUT
TMR
GND
OUT
reaches 1.25V, the FLT pin pulls low to in-
FLT
OV
VA
+
–
1.25V
43561 BD
FLT
EN
FB
CC
LT4356-1
and OUT pins.
TMR
reaches
43561fd
TMR
7