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.
n
n
n
n
n
n
n
Wide Operating Voltage Range: 4V to 80V
Withstands Surges Over 80V with V
CC
Clamp
Adjustable Output Clamp Voltage
Ideal Diode Controller Holds Up Output Voltage
During Input Brownouts
Reverse Input Protection to –40V
Reverse Output Protection to –20V
Overcurrent Protection
Low 10μA Shutdown Current at 12V
Adjustable Fault Timer
0.1% Retry Duty Cycle During Faults (LTC4364-2)
Available in 4mm
×
3mm 14-Lead DFN, 16-Lead MSOP
,
and 16-Lead SO Packages
APPLICATIONS
n
n
n
n
Automotive/Avionic Surge Protection
Hot Swap/Live Insertion
Redundant Supply ORing
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.
TYPICAL APPLICATION
4A, 12V Overvoltage Output Regulator with Ideal Diode
Withstands 200V 1ms Transient at V
IN
V
IN
12V
FDB33N25
383k
CMZ5945B
68V
FDB3682
10m
V
IN
20V/DIV
Overvoltage Protector Regulates
Output at 27V During Input Transient
92V INPUT SURGE
V
OUT
CLAMPED
AT 27V
C
TMR
= 6.8µF
I
LOAD
= 0.5A
+
2.2k 6.8nF
10
12V
V
OUT
20V/DIV 12V
27V CLAMP (ADJUSTABLE)
22µF
V
CC
SHDN
UV
6V
OV
60V
UV
90.9k
OV
10k
HGATE SOURCE DGATE SENSE
OUT
FB
102k
50ms/DIV
4364 TA01b
LTC4364
ENOUT
GND
TMR
0.22µF
FLT
4.99k
ENABLE
FAULT
436412 TA01a
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
10V/DIV
OUTPUT HELD UP
1ms/DIV
4364 TA01c
436412f
1
LTC4364-1/LTC4364-2
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2)
Supply Voltage: V
CC
................................. –40V to 100V
SOURCE, OV, UV,
SHDN
Voltages ............. –40V to 100V
DGATE, HGATE Voltages
(Note 3) ..................... SOURCE – 0.3V to SOURCE + 10V
ENOUT,
FLT
Voltages ................................ –0.3V to 100V
OUT, SENSE Voltages.................................–20V to 100V
Voltage Difference (SENSE to OUT) ............ –30V to 30V
Voltage Difference (OUT to V
CC
) ..............–100V to 100V
Voltage Difference (SENSE to SOURCE) ..–100V to 100V
FB, TMR Voltages ..................................... –0.3V to 5.5V
Operating Ambient Temperature Range
LTC4364C ................................................ 0°C to 70°C
LTC4364I .............................................–40°C to 85°C
LTC4364H .......................................... –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MS, SO Packages ............................................. 300°C
PIN CONFIGURATION
TOP VIEW
OUT
SENSE
DGATE
SOURCE
HGATE
V
CC
SHDN
1
2
3
4
5
6
7
15
14 FB
13 TMR
12 ENOUT
11
FLT
10 GND
9 OV
8 UV
OUT
SENSE
NC
DGATE
SOURCE
HGATE
NC
V
CC
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
FB
TMR
ENOUT
FLT
GND
OV
UV
SHDN
OUT 1
SENSE 2
NC 3
DGATE 4
SOURCE 5
HGATE 6
NC 7
V
CC
8
TOP VIEW
16 FB
15 TMR
14 ENOUT
13
FLT
12 GND
11 OV
10 UV
9
SHDN
DE PACKAGE
14-LEAD (4mm
×
3mm) PLASTIC DFN
T
JMAX
= 150°C,
θ
JA
= 45°C/W
EXPOSED PAD (PIN 15) PCB GND CONNECTION OPTIONAL
MS PACKAGE
16-LEAD PLASTIC MSOP
T
JMAX
= 150°C,
θ
JA
= 120°C/W
S PACKAGE
16-LEAD PLASTIC SO
T
JMAX
= 150°C,
θ
JA
= 100°C/W
ORDER INFORMATION
LEAD FREE FINISH
LTC4364CDE-1#PBF
LTC4364IDE-1#PBF
LTC4364HDE-1#PBF
LTC4364CDE-2#PBF
LTC4364IDE-2#PBF
LTC4364HDE-2#PBF
LTC4364CMS-1#PBF
LTC4364IMS-1#PBF
LTC4364HMS-1#PBF
LTC4364CMS-2#PBF
LTC4364IMS-2#PBF
LTC4364HMS-2#PBF
TAPE AND REEL
LTC4364CDE-1#TRPBF
LTC4364IDE-1#TRPBF
LTC4364HDE-1#TRPBF
LTC4364CDE-2#TRPBF
LTC4364IDE-2#TRPBF
LTC4364HDE-2#TRPBF
LTC4364CMS-1#TRPBF
LTC4364IMS-1#TRPBF
LTC4364HMS-1#TRPBF
LTC4364CMS-2#TRPBF
LTC4364IMS-2#TRPBF
LTC4364HMS-2#TRPBF
PART MARKING*
43641
43641
43641
43642
43642
43642
43641
43641
43641
43642
43642
43642
PACKAGE DESCRIPTION
14-Lead (4mm
×
3mm) Plastic DFN
14-Lead (4mm
×
3mm) Plastic DFN
14-Lead (4mm
×
3mm) Plastic DFN
14-Lead (4mm
×
3mm) Plastic DFN
14-Lead (4mm
×
3mm) Plastic DFN
14-Lead (4mm
×
3mm) Plastic DFN
16-Lead Plastic MSOP
16-Lead Plastic MSOP
16-Lead Plastic MSOP
16-Lead Plastic MSOP
16-Lead Plastic MSOP
16-Lead Plastic MSOP
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
436412f
2
LTC4364-1/LTC4364-2
ORDER INFORMATION
LEAD FREE FINISH
LTC4364CS-1#PBF
LTC4364IS-1#PBF
LTC4364HS-1#PBF
LTC4364CS-2#PBF
LTC4364IS-2#PBF
LTC4364HS-2#PBF
TAPE AND REEL
LTC4364CS-1#TRPBF
LTC4364IS-1#TRPBF
LTC4364HS-1#TRPBF
LTC4364CS-2#TRPBF
LTC4364IS-2#TRPBF
LTC4364HS-2#TRPBF
PART MARKING*
LTC4364S-1
LTC4364S-1
LTC4364S-1
LTC4364S-2
LTC4364S-2
LTC4364S-2
PACKAGE DESCRIPTION
16-Lead Plastic SO
16-Lead Plastic SO
16-Lead Plastic SO
16-Lead Plastic SO
16-Lead Plastic SO
16-Lead Plastic SO
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
0°C to 70°C
–40°C to 85°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to:
http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to:
http://www.linear.com/tapeandreel/
ELECTRICAL CHARACTERISTICS
SYMBOL
V
CC
I
CC
I
CC(SHDN)
I
CC(REV)
Surge Stopper
∆V
HGATE
I
HGATE(UP)
I
HGATE(DN)
HGATE Gate Drive, (V
HGATE
− V
SOURCE
)
HGATE Pull-Up Current
HGATE Pull-Down Current
PARAMETER
Operating Supply Range
Supply Current
Supply Current in Shutdown
Reverse Input Current
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 12V.
CONDITIONS
l
MIN
4
l
l
l
TYP
370
10
0
MAX
80
750
50
–10
9
16
–30
UNITS
V
µA
μA
μA
V
V
µA
mA
mA
mA
V
CC
= SOURCE = SENSE = OUT = 12V, No Fault
Shutdown
V
CC
= −30V
V
CC
= 4V, DGATE Low, I
HGATE
= 0µA, −1µA
V
CC
= 8V to 80V, DGATE Low, I
HGATE
= 0µA, −1µA
V
CC
= HGATE = DGATE = SOURCE = 12V
Overvoltage: FB = 1.5V,
∆V
HGATE
= 5V
Overcurrent:
∆V
SNS
= 100mV,
∆V
HGATE
= 5V
Shutdown/Fault Turn-Off:
∆V
HGATE
= 5V
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
5
10
–10
60
60
0.4
7
12
–20
130
130
1
18
32
–2.0
I
SRC
V
FB
I
FB
∆V
SNS
I
SNS
I
TMR(UP)
SOURCE Input Current
V
CC
= SOURCE = SENSE = OUT = 12V
V
CC
= SOURCE = 12V, Shutdown
V
SOURCE
= –30V
V
CC
= 12V to 80V
FB = 1.25V
V
CC
= 4V to 80V, OUT = 2.5V to V
CC
, 0°C to 125°C
V
CC
= 4V to 80V, OUT = 2.5V to V
CC
, –40°C to 125°C
V
CC
= 4V to 80V, OUT = 0V to 1.5V
SENSE = V
CC
= SOURCE = OUT = 12V
SENSE = –15V
TMR = 1V, FB = 1.5V, V
CC
– OUT = 0.5V
TMR = 1V, FB = 1.5V, V
CC
– OUT = 75V
TMR = 1V,
∆V
SNS
= 60mV, V
CC
– OUT = 0.5V
TMR = 1V,
∆V
SNS
= 60mV, V
CC
– OUT = 75V
TMR = 1.3V, FB = 1.5V, V
CC
– OUT = 0.5V
TMR = 1V, FB = 1.5V
TMR = 1V, FB = 1.5V, Retry
Shutdown
FLT
Falling, V
CC
= 4V to 80V
HGATE Falling, V
CC
= 4V to 80V
40
90
–3.5
1.28
1
55
57
32
110
–4
–3
–60
–14
–310
–7
–3
2.7
1.5
1.28
1.38
µA
µA
mA
V
µA
mV
mV
mV
µA
mA
µA
µA
µA
µA
µA
µA
µA
mA
V
V
436412f
FB Servo Voltage
FB Input Current
Overcurrent Fault Threshold,
(V
SENSE
– V
OUT
)
SENSE Input Current
TMR Pull-Up Current, Overvoltage
TMR Pull-Up Current, Overcurrent
TMR Pull-Up Current, Warning
TMR Pull-Up Current, Retry
1.22
45
43
18
1.25
0
50
50
25
55
–2
–1.3
–40
–6
–210
–3
–1.3
1.1
0.3
1.22
1.32
–2.2
–50
–10
–260
–5
–2
2
0.75
1.25
1.35
I
TMR(DN)
V
TMR(F)
V
TMR(G)
TMR Pull-Down Current
TMR Fault Threshold
TMR Gate Off Threshold
3
LTC4364-1/LTC4364-2
ELECTRICAL CHARACTERISTICS
SYMBOL
V
TMR(R)
∆V
TMR
V
UV
V
UV(HYST)
V
UV(RST)
V
OV
V
OV(HYST)
I
IN
V
OL
I
LEAK
∆V
OUT(TH)
V
OUT(RST)
I
OUT
PARAMETER
TMR Retry Threshold
Early Warning Timer Window
UV Input Threshold
UV Input Hysteresis
UV Reset Threshold
OV Input Threshold
OV Input Hysteresis
UV, OV Input Current
ENOUT,
FLT
Output Low
ENOUT,
FLT
Leakage Current
Out High Threshold (V
CC
– V
OUT
)
Out Reset Threshold
OUT Input Current
Output Current in Shutdown, I
SNS
+ I
OUT
V
SHDN
V
SHDN(FLT)
I
SHDN
D
SHDN
Input Threshold
SHDN
Pin Float Voltage
SHDN
Input Current
UV, OV = 1.25V
UV, OV = –30V
I
SINK
= 0.25mA
I
SINK
= 2mA
ENOUT,
FLT
= 80V
ENOUT from Low to High
ENOUT from High to Low
V
CC
= OUT = 12V,
SHDN
Open
OUT = –15V
V
CC
= SOURCE = SENSE = OUT = 12V, Shutdown
V
CC
= 4V to 80V
V
CC
= 12V to 80V
SHDN
= 0.5V
Maximum Allowable Leakage, V
CC
= 4V
SHDN
= –30V
FB = 1.5V, V
CC
= 80V, OUT = 16V
∆V
SNS
= 60mV, V
CC
– OUT = 12V
UV Steps from 1.5V to 1V
FB Steps from 1V to 1.5V
∆V
SNS
Steps from 0mV to 150mV, OUT = 0V
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
CC
= 12V.
CONDITIONS
HGATE Rising (After 32 Cycles), V
CC
= 4V to 80V
V
TMR(G)
– V
TMR(F)
, V
CC
= 4V to 80V
UV Falling, V
CC
= 4V to 80V
UV Falling, V
CC
= 4V to 80V, LTC4364-1 Only
OV Rising, V
CC
= 4V to 80V
l
l
l
l
l
l
MIN
0.125
75
1.22
25
0.5
1.22
TYP
0.15
100
1.25
50
0.6
1.25
12
0
–0.3
0.1
0.5
0
MAX
0.175
125
1.28
80
0.7
1.28
1
–0.6
0.3
1.3
2.5
1
3
80
–8
40
2.2
6.5
UNITS
V
mV
V
mV
V
V
mV
µA
mA
V
V
µA
V
V
µA
mA
µA
V
V
µA
µA
µA
%
%
μs
μs
μs
0.4
1.4
0.7
2.2
40
–4
12
0.5
2.3
–1
1.6
4
–3.3
–1.5
–120
0.125
0.075
1.3
0.25
0.5
–300
0.2
0.12
4
1
2
Retry Duty Cycle, Overvoltage
Retry Duty Cycle, Output Short
t
OFF,HGATE(UV)
Undervoltage to HGATE Low Propagation
Delay
t
OFF,HGATE(OV)
Overvoltage to HGATE Low Propagation
Delay
t
OFF,HGATE(OC)
Overcurrent to HGATE Low Propagation
Delay
Ideal Diode
ΔV
DGATE
I
DGATE(UP)
I
DGATE(DN)
∆V
SD
t
OFF(DGATE)
DGATE Gate Drive, (V
DGATE
− V
SOURCE
)
DGATE Pin Pull-Up Current
DGATE Pin Pull-Down Current
Ideal Diode Regulation Voltage,
(V
SOURCE
− V
SENSE
)
DGATE Turn-Off Propagation Delay
V
CC
= 4V, No Fault, I
DGATE
= 0µA, −1µA
V
CC
= 8V to 80V, No Fault, I
DGATE
= 0µA, −1µA
DGATE = SOURCE = V
CC
= 12V,
∆V
SD
= 0.1V
∆V
DGATE
= 5V,
∆V
SD
= –0.2V
∆V
DGATE
= 5V, Shutdown/Fault Turn-Off
∆V
DGATE
= 2.5V, V
CC
= SOURCE = 12V
∆V
DGATE
= 2.5V, V
CC
= SOURCE = 4V
∆V
SD
Steps from 0.1V to –1V
l
l
l
l
l
l
l
l
5
10
–5
60
0.4
10
24
8.5
12
–10
130
1
30
48
0.35
12
16
–15
V
V
µA
mA
mA
45
72
1.5
mV
mV
μs
Note 1:
Stress beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
All Currents into device pins are positive and all currents out
of device pins are negative. All voltages are referenced to GND unless
otherwise specified.
Note 3:
Internal clamps limit the HGATE and DGATE pins to minimum of
10V above the SOURCE pin. Driving these pins to voltages beyond the
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