LTC4366
High Voltage Surge Stopper
FEATURES
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DESCRIPTION
The
LTC
®
4366
surge stopper protects loads from high
voltage transients. By controlling the gate of an external
N-channel MOSFET, the LTC4366 regulates the output
during an overvoltage transient. The load may remain
operational while the overvoltage is dropped across the
MOSFET. Placing a resistor in the return line isolates the
LTC4366 and allows it to float up with the supply; therefore,
the upper limit on the output voltage depends only on the
availability of high valued resistors and MOSFET ratings.
An adjustable overvoltage timer prevents MOSFET dam-
age during the surge while an additional 9-second timer
provides for MOSFET cool down. A shutdown pin reduces
the quiescent current to less than 14µA during shutdown.
After a fault the LTC4366-1 latches off while the LTC4366-2
will auto-retry.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners. Patents pending.
Rugged Floating Topology
Wide Operating Voltage Range: 9V to >500V
Adjustable Output Clamp Voltage
Controls N-Channel MOSFET
Adjustable Protection Timer
Internal 9-Second Cool-Down Timer
Shutdown I
Q
< 14µA
8-Lead TSOT and 3mm
×
2mm DFN Packages
APPLICATIONS
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Industrial, Automotive and Avionic Surge Protection
High Voltage DC Distribution
28V Vehicle Systems
TYPICAL APPLICATION
Overvoltage Protected 1.5A, 28V Supply
V
IN
28V
IXTK90N25L2
V
OUT
1.5A
0.47µF
V
IN
100V/DIV
Overvoltage Protector Regulates Output at 43V During Transient
250V INPUT SURGE
10
324k
V
DD
SD
TIMER
1µF
GATE
2nF
28V
OUT
FB
BASE
12.4k
V
OUT
20V/DIV
43V CLAMP
28V
LTC4366-2
V
SS
422k
436612 TA01a
46.4k
100ms/DIV
436612 TA01b
436612fe
For more information
www.linear.com/LTC4366
1
LTC4366
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 2) All voltages relative to V
SS
, unless otherwise noted.
Supply Voltage (V
DD
) ................................ –0.3V to 10V
Supply Voltage (OUT) ................................. –0.3V to 5V
Input Voltages
FB .............................................. –0.3V to OUT + 0.3V
TIMER ................................................... –0.3V to 3.5V
SD
.......................................................... –0.3V to 10V
Output Voltages
BASE.........................................................–1.5V to 4V
OUT – BASE ......................................... –0.3V to 5.5V
GATE (Note 3) ........................................ –0.3V to 15V
GATE – OUT (Note 3) ............................. –0.3V to 10V
Currents
I
VDD
...................................................................10mA
I
OUT
...................................................................10mA
BASE................................................. –300µA to 10µA
SD
.......................................................–10mA to 10µA
Operating Ambient Temperature Range (Note 4)
LTC4366C ................................................ 0°C to 70°C
LTC4366I .............................................–40°C to 85°C
LTC4366H .......................................... –40°C to 125°C
LTC4366MP ....................................... –55°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
TSOT-23 Package Only .................................... 300°C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
V
DD
1
SD
2
TIMER 3
V
SS
4
8 GATE
7 OUT
6 FB
5 BASE
V
SS
1
TIMER 2
SD
3
V
DD
4
9
8
7
6
5
BASE
FB
OUT
GATE
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
T
JMAX
= 150°C,
θ
JA
= 195°C/W
DDB PACKAGE
8-LEAD (3mm
×
2mm) PLASTIC DFN
T
JMAX
= 150°C,
θ
JA
= 75°C/W IF V
SS
IS SOLDERED TO PCB,
θ
JA
= 135°C/W IF V
SS
IS NOT SOLDERED TO PCB
EXPOSED PAD (PIN 9), PCB V
SS
CONNECTION OPTIONAL
2
436612fe
For more information
www.linear.com/LTC4366
LTC4366
ORDER INFORMATION
Lead Free Finish
TAPE AND REEL (MINI)
LTC4366CTS8-1#TRMPBF
LTC4366ITS8-1#TRMPBF
LTC4366HTS8-1#TRMPBF
LTC4366CDDB-1#TRMPBF
LTC4366IDDB-1#TRMPBF
LTC4366HDDB-1#TRMPBF
LTC4366CTS8-2#TRMPBF
LTC4366ITS8-2#TRMPBF
LTC4366HTS8-2#TRMPBF
LTC4366CDDB-2#TRMPBF
LTC4366IDDB-2#TRMPBF
LTC4366HDDB-2#TRMPBF
LTC4366MPTS8-1#TRMPBF
LTC4366MPTS8-2#TRMPBF
TAPE AND REEL
LTC4366CTS8-1#TRPBF
LTC4366ITS8-1#TRPBF
LTC4366HTS8-1#TRPBF
LTC4366CDDB-1#TRPBF
LTC4366IDDB-1#TRPBF
LTC4366HDDB-1#TRPBF
LTC4366CTS8-2#TRPBF
LTC4366ITS8-2#TRPBF
LTC4366HTS8-2#TRPBF
LTC4366CDDB-2#TRPBF
LTC4366IDDB-2#TRPBF
LTC4366HDDB-2#TRPBF
LTC4366MPTS8-1#TRPBF
LTC4366MPTS8-2#TRPBF
PART MARKING*
LTFMC
LTFMC
LTFMC
LFMD
LFMD
LFMD
LTFMF
LTFMF
LTFMF
LFMG
LFMG
LFMG
LTFMC
LTFMF
LFMD
LFMG
PACKAGE DESCRIPTION
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead (3mm
×
2mm) Plastic DFN
8-Lead (3mm
×
2mm) Plastic DFN
8-Lead (3mm
×
2mm) Plastic DFN
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead (3mm
×
2mm) Plastic DFN
8-Lead (3mm
×
2mm) Plastic DFN
8-Lead (3mm
×
2mm) Plastic DFN
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead (3mm
×
2mm) Plastic DFN
8-Lead (3mm
×
2mm) Plastic DFN
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
–55°C to 125°C
–55°C to 125°C
–55°C to 125°C
–55°C to 125°C
LTC4366MPDDB-1#TRMPBF LTC4366MPDDB-1#TRPBF
LTC4366MPDDB-2#TRMPBF LTC4366MPDDB-2#TRPBF
TRM = 500 pieces. *Temperature grades are identified by a label on the shipping container.
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on 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/
436612fe
For more information
www.linear.com/LTC4366
3
LTC4366
ELECTRICAL CHARACTERISTICS
SYMBOL
V
DD
Regulator
V
Z(VDD)
∆V
Z(VDD)
V
DD
I
VDD(STLO)
I
VDD(STHI)
I
VDD(SD)
V
Z(OUT)
∆V
Z(OUT)
OUT
V
UVLO1
∆V
UVH1
V
UVLO2
∆V
UVH2
I
OUT(AMP)
I
OUT(CP)
I
OUT(SD)
BASE, V
SS
V
Z(BASE)
∆V
Z(BASE)
I
BASE
I
VSS(AMP)
I
VSS(CP)
I
VSS(SD)
GATE Drive
∆V
GATE
I
GATE(ST)
I
GATE(CP)
I
GATE(FD)
I
GATE(FLT)
External N-Channel Gate Drive (GATE – OUT)
GATE Pin Current – Start-Up
GATE Pin Current – Charge Pump On
GATE Pin Current – Fast Discharge
GATE Pin Current – Fault
OUT = 4.9V, I = 0, –1µA
GATE = OUT = 0V
GATE = 5V, OUT = 4.9V
GATE = 10V, OUT = 4.9V
GATE = 10V, OUT = 4.9V
LTC4366C/I/H
LTC4366MP
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The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. All voltages relative to V
SS
, unless otherwise noted.
PARAMETER
V
DD
Shunt Regulator Voltage
V
DD
Shunt Regulator Load Regulation
V
DD
Supply Voltage (Note 3)
V
DD
Pin Current – Start-Up, Gate Low
V
DD
Pin Current – Start-Up, Gate High
V
DD
Pin Current – Shutdown
OUT Shunt Regulator Voltage
OUT Shunt Regulator Load Regulation
OUT Supply Voltage (Note 3)
OUT Undervoltage Lockout 1
OUT Undervoltage Lockout 1 Hysteresis
OUT Undervoltage Lockout 2
OUT Undervoltage Lockout 2 Hysteresis
OUT Pin Current – Regulation Amplifier On
OUT Pin Current – Charge Pump On
OUT Pin Current – Shutdown
BASE Shunt Regulator Voltage (OUT – BASE)
BASE Shunt Regulator Load Regulation
BASE Pin Leakage Current
V
SS
Pin Current – Regulation Amplifier On
V
SS
Pin Current – Charge Pump On
V
SS
Pin Current – Shutdown
I = –10µA, OUT = 4.5V
I = –10µA to –80µA, OUT = 4.5V
OUT = 4.5V, BASE = –0.5V
Rising
Rising
LTC4366C/I/H
LTC4366MP
GATE = 0V, V
DD
= 7V, OUT = 0V
GATE Open, V
DD
= 7V, OUT = 0V
V
DD
= 7V, OUT = 0V
I = 1mA, BASE = 0V
I = 1mA to 5mA
CONDITIONS
I = 1mA
I = 1mA to 5mA
LTC4366C/I/H
LTC4366MP
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MIN
11.5
TYP
12
30
30
MAX
12.5
90
130
V
Z(VDD)
23
13
8
6.0
70
V
Z(OUT)
2.75
2.80
0.4
4.9
0.5
54
220
6
6.6
200
–5.5
–72
–230
–12
12.5
–11
–11
–28
300
1.2
UNITS
V
mV
mV
V
µA
µA
µA
V
mV
V
V
V
V
V
V
µA
µA
µA
V
mV
µA
µA
µA
µA
V
µA
µA
µA
mA
mA
4.5
15
9
5
5.0
3.0
2.42
2.42
0.2
4.5
0.3
2.55
2.55
0.28
4.75
0.4
37
150
3
5.5
–0.1
–30
–108
6.2
125
–0.8
–45
–160
–7
11.2
–4.5
–3.2
–14
122
0.3
12
–7.5
–7.5
–20
200
0.7
5.7
30
OUT Regulator
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436612fe
For more information
www.linear.com/LTC4366
LTC4366
ELECTRICAL CHARACTERISTICS
SYMBOL
V
FB(REG)
I
FB
V
SD(TH)
V
SD(HYST)
I
SD
V
TIMER(H)
I
TIMER(UP)
I
TIMER(DN)
PARAMETER
3% FB pin Regulation Threshold (OUT – FB)
FB Pin Leakage Current
SD
Pin Threshold Voltage (V
DD
–
SD)
SD
Pin Hysteresis
SD
Pin Input Pull-Up Current
TIMER Pin Threshold
TIMER Pin Pull-Up Current
TIMER Pin Pull-Down Current
V
DD
–
SD
= 0.7V
OUT – FB = 1.2V
Falling
LTC4366C/I/H
LTC4366MP
LTC4366C/I/H
LTC4366MP
LTC4366C/I/H
LTC4366MP
LTC4366C/I/H
LTC4366MP
FB,
SD,
TIMER
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The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. All voltages relative to V
SS
, unless otherwise noted.
CONDITIONS
MIN
1.193
1.0
147
129
–0.7
–0.5
2.6
–5.1
–4
0.9
0.7
15
420
60
5.9
5.9
TYP
1.23
0
1.5
280
280
–1.6
–1.6
2.8
–9
–9
1.8
1.8
20
700
150
9
9
MAX
1.267
±1
2.3
530
530
–3.5
–3.5
3.1
–13
–13
2.8
2.8
25
1200
300
16
19
UNITS
V
µA
V
mV
mV
µA
µA
V
µA
µA
µA
µA
%
µs
ns
Seconds
Seconds
TIMER Rising, V
DD
= 7V, OUT = V
Z(OUT)
TIMER = 1V
TIMER = 1V
I
TIMER(RATIO)
TIMER Pin Current Ratio I
TIMER(DN)
/I
TIMER(UP)
AC Characteristics
t
DLY
–
SD
t
DLY
–
FAST
t
D(COOL)
SD
Low to Gate Low Filter Time
FB Low to Gate Low Delay Time
Cool-Down Timer (Internal)
Step V
DD
–
SD
from 0V to 3V
Step OUT – FB from 0V to 1.3V
V
DD
= V
Z(VDD)
LTC4366C/I/H
LTC4366MP
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Note 1:
Stresses 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 pins are positive.
Note 3:
Limits on the maximum rating is defined as whichever limit occurs
first. An internal clamp limits the GATE pin to a maximum of 12V above
source. Driving this pin to voltages beyond the clamp may damage the
device.
Note 4:
T
J
is calculated from the ambient temperature, T
A
, and power
dissipation, P
D
, according to the formula:
T
J
= T
A
+ (P
D
•
θ
JA
)
436612fe
For more information
www.linear.com/LTC4366
5
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