LTC4364-2_15 Datasheet, PDF (1/24 Pages) Linear Technology – Surge Stopper with Ideal Diode

LTC4364-1/LTC4364-2
Surge Stopper
with Ideal Diode
FEATURES
n _{Wide Operating Voltage Range: 4V to 80V}
n _{Withstands Surges Over 80V with VCC Clamp}
n _{Adjustable Output Clamp Voltage}
n _{Ideal Diode Controller Holds Up Output Voltage}
During Input Brownouts
n _{Reverse Input Protection to –40V}
n _{Reverse Output Protection to –20V}
n _{Overcurrent Protection}
n _{Low 10μA Shutdown Current at 12V}
n _{Adjustable Fault Timer}
n _{0.1% Retry Duty Cycle During Faults (LTC4364-2)}
n _{Available in 4mm × 3mm 14-Lead DFN, 16-Lead MSOP,}
and 16-Lead SO Packages
APPLICATIONS
n _{Automotive/Avionic Surge Protection}
n _{Hot Swap/Live Insertion}
n _{Redundant Supply ORing}
n _{Output Port Protection}
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
DESCRIPTION
The LTC^®4364 surge stopper with ideal diode controller
protects loads from high voltage transients. It limits and
regulates the output during an overvoltage event, such
as load dump in automobiles, by controlling the voltage
drop across an external N-channel MOSFET pass device.
The LTC4364 also includes a timed, current limited circuit
breaker. In a fault condition, an adjustable fault timer must
expire before the pass device is turned off. The LTC4364-1
latches off the pass device while the LTC4364-2 automati-
cally restarts after a delay. The LTC4364 precisely monitors
the input supply for overvoltage (OV) and undervoltage
(UV) conditions. The external MOSFET is held off in un-
dervoltage and auto-retry is disabled in overvoltage.
An integrated ideal diode controller drives a second MOS-
FET to replace a Schottky diode for reverse input protec-
tion and output voltage holdup. The LTC4364 controls the
forward voltage drop across the MOSFET and minimizes
reverse current transients upon power source failure,
brownout or input short.
TYPICAL APPLICATION
4A, 12V Overvoltage Output Regulator with Ideal Diode
Withstands 200V 1ms Transient at V_IN
V_IN
12V
383k
CMZ5945B
68V
FDB33N25
FDB3682 10mΩ
2.2k 6.8nF 10Ω
V_OUT
+
CLAMPED
AT 27V
22µF
UV
6V
90.9k
OV
60V
10k
V_CC
SHDN
UV
OV
HGATE SOURCE DGATE SENSE
OUT
FB
LTC4364
102k
4.99k
GND
TMR
0.22µF
ENOUT
ENABLE
FLT
FAULT
436412 TA01a
Overvoltage Protector Regulates
Output at 27V During Input Transient
92V INPUT SURGE
V_IN
20V/DIV
12V
27V CLAMP (ADJUSTABLE)
V_OUT
20V/DIV
12V
50ms/DIV
C_TMR = 6.8µF
I_LOAD = 0.5A
4364 TA01b
Ideal Diode Holds Up Output
During Input Short
12V
V_IN
10V/DIV
INPUT SHORTED
TO GND
C_LOAD = 6300µF
I_LOAD = 0.5A
V_OUT ^{12V OUTPUT HELD UP}
10V/DIV
1ms/DIV
4364 TA01c
436412f
1