LT4356MP-1 Linear Technology Corporation, LT4356MP-1 Datasheet - Page 7

• Manufacturer Part Number: LT4356MP-1
• Description: Surge Stopper
• Manufacturer: Linear Technology Corporation

PIN FUNCTIONS
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: 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
SNS pins to 50mV. At the same time the 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
less than 30V. Connect to V
TMR: Fault Timer Input. Connect a capacitor between this
pin and ground to set the times for early warning, fault
and cooldown periods. The current charging up this pin
BLOCK DIAGRAM
SHDN
A
IN
OUT
+
50mV
CC
–
+
+
–
+
if unused.
V
AUXILIARY
AMPLIFIER
IA
CC
CC
1.25V
pin must be limited to
–
+
–
SNS
2μA
0.5V
V
CHARGE
PUMP
CC
TMR
CC
I
TMR
1.35V
1.25V
and
GATE
SHDN
RESTART
–
+
+
–
during fault conditions depends on the voltage difference
between the V
the FLT pin pulls low to indicate the detection of a fault
condition. If the condition persists, the pass transistor
turns off when V
soon as the fault condition disappears, the pull-up current
stops and a 2μA current starts to pull the TMR pin down.
When V
pin pulls high turning back on the pass transistor.
V
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
: Positive Supply Voltage Input. The positive supply
CONTROL
LT4356MP-1/LT4356MP-2
GATEOFF
LOGIC
OUT
TMR
GND
OUT
reaches the retry threshold of 0.5V, the GATE
CC
FLT
OV
and OUT pins. When V
TMR
reaches the threshold of 1.35V. As
VA
–
+
1.25V
4356mp12 BD
FLT
EN
FB
TMR
reaches 1.25V,
4356mp12f
7