FeaTures
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LTC4365
Overvoltage,
Undervoltage and Reverse
Supply Protection Controller
DescripTion
The
LTC
®
4365
protects applications where power supply
input voltages may be too high, too low or even negative.
It does this by controlling the gate voltages of a pair of
external N-channel MOSFETs to ensure that the output
stays within a safe operating range.The LTC4365 can
withstand voltages between –40V and 60V and has an
operating range of 2.5V to 34V, while consuming only
125µA in normal operation.
Two comparator inputs allow configuration of the over-
voltage (OV) and undervoltage (UV) set points using an
external resistive divider. A shutdown pin provides external
control for enabling and disabling the MOSFETs as well
as placing the device in a low current shutdown state. A
fault output provides status of the gate pin pulling low. A
fault is indicated when the part is in shutdown or the input
voltage is outside the UV and OV set points.
The LTC4365 has a 36ms turn-on delay that debounces
live connections and blocks 50Hz to 60Hz AC power. For
fast recovery after faults, the LTC4365-1 has a reduced
1ms turn-on delay.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT and Hot Swap are trademarks of Linear Technology Corporation. All other trademarks
are the property of their respective owners.
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Wide Operating Voltage Range: 2.5V to 34V
Overvoltage Protection to 60V
Reverse Supply Protection to –40V
LTC4365: Blocks 50Hz and 60Hz AC Power
LTC4365-1: Fast (1ms) Recovery from Fault
No Input Capacitor or TVS Required for Most
Applications
Adjustable Undervoltage and Overvoltage
Protection Range
Charge Pump Enhances External N-Channel MOSFET
Low Operating Current: 125µA
Low Shutdown Current: 10µA
Compact 8-Lead, 3mm × 2mm DFN and
TSOT-23 (ThinSOT™) Packages
applicaTions
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Portable Instrumentation
Industrial Automation
Laptops
Automotive Surge Protection
Typical applicaTion
12V Automotive Application
V
IN
12V
Si4946
V
OUT
3A
Load Protected from Reverse and Overvoltage at V
IN
30V
VALID
WINDOW
GND
V
OUT
UV = 3.5V
OV = 18V
V
IN
V
IN
510k
1820k
UV
243k
OV
59k
GATE
LTC4365
V
OUT
V
OUT
SHDN
FAULT
10V/DIV
–30V
OV = 18V
UV = 3.5V
4365 TA01a
V
IN
GND
1s/DIV
4365 TA01b
4365fa
For more information
www.linear.com/LTC4365
1
LTC4365
absoluTe MaxiMuM raTings
Supply Voltage (Note 1)
V
IN
.......................................................... –40V to 60V
Input Voltages (Note 3)
UV,
SHDN
.............................................. –0.3V to 60V
OV ............................................................ –0.3V to 6V
V
OUT
....................................................... –0.3V to 40V
Output Voltages (Note 4)
FAULT
..................................................... –0.3V to 60V
GATE ....................................................... –40V to 45V
Input Currents
UV, OV,
SHDN
....................................................–1mA
Operating Ambient Temperature Range
LTC4365C ................................................ 0°C to 70°C
LTC4365I .............................................–40°C to 85°C
LTC4365H .......................................... –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
for TSOT Only ................................................... 300°C
pin conFiguraTion
TOP VIEW
GND 1
OV 2
UV 3
V
IN
4
9
GND
8
7
6
5
SHDN
FAULT
V
OUT
GATE
TOP VIEW
V
IN
UV
OV
GND
1
2
3
4
8
7
6
5
GATE
V
OUT
FAULT
SHDN
DDB PACKAGE
8-LEAD (3mm
×
2mm) PLASTIC DFN
T
JMAX
= 150°C,
θ
JA
= 76°C/W
EXPOSED PAD (PIN 9) PCB GROUND CONNECTION OPTIONAL
TS8 PACKAGE
8-LEAD PLASTIC TSOT-23
T
JMAX
= 150°C,
θ
JA
= 195°C/W
2
4365fa
For more information
www.linear.com/LTC4365
LTC4365
orDer inForMaTion
Lead Free Finish
TAPE AND REEL (MINI)
LTC4365CDDB#TRMPBF
LTC4365CDDB-1#TRMPBF
LTC4365IDDB#TRMPBF
LTC4365IDDB-1#TRMPBF
LTC4365HDDB#TRMPBF
LTC4365HDDB-1#TRMPBF
LTC4365CTS8#TRMPBF
LTC4365CTS8-1#TRMPBF
LTC4365ITS8#TRMPBF
LTC4365ITS8-1#TRMPBF
LTC4365HTS8#TRMPBF
LTC4365HTS8-1#TRMPBF
TAPE AND REEL
LTC4365CDDB#TRPBF
LTC4365CDDB-1#TRPBF
LTC4365IDDB#TRPBF
LTC4365IDDB-1#TRPBF
LTC4365HDDB#TRPBF
LTC4365HDDB-1#TRPBF
LTC4365CTS8#TRPBF
LTC4365CTS8-1#TRPBF
LTC4365ITS8#TRPBF
LTC4365ITS8-1#TRPBF
LTC4365HTS8#TRPBF
LTC4365HTS8-1#TRPBF
PART MARKING*
LFKS
LGMB
LFKS
LGMB
LFKS
LGMB
LTFKT
LTGKZ
LTFKT
LTGKZ
LTFKT
LTGKZ
PACKAGE DESCRIPTION
8-Lead (3mm × 2mm) Plastic DFN
8-Lead (3mm × 2mm) Plastic DFN
8-Lead (3mm × 2mm) Plastic DFN
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 Plastic TSOT-23
8-Lead Plastic TSOT-23
8-Lead Plastic TSOT-23
TEMPERATURE RANGE
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
–40°C to 125°C
–40°C to 125°C
0°C to 70°C
0°C to 70°C
–40°C to 85°C
–40°C to 85°C
–40°C to 125°C
–40°C to 125°C
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/
elecTrical characTerisTics
SYMBOL
V
IN
, V
OUT
V
IN
I
VIN
I
VIN(R)
V
IN(UVLO)
I
VOUT
GATE
ΔV
GATE
I
GATE(UP)
I
GATE(FAST)
t
GATE(FAST)
N-Channel Gate Drive
(GATE-V
OUT
)
N-Channel Gate Pull Up Current
N-Channel Gate Fast Pull Down Current
N-Channel Gate Fast Turn Off Delay
Input Voltage Range
Input Supply Current
PARAMETER
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 2.5V to 34V, unless otherwise noted. (Note 2)
CONDITIONS
Operating Range
Protection Range
SHDN
= 0V, V
IN
= V
OUT
, –40°C to 85°C
SHDN
= 0V, V
IN
= V
OUT
, –40°C to 125°C
SHDN
= 2.5V
V
IN
= –40V, V
OUT
= 0V
V
IN
Rising
SHDN
= 0V, V
IN
= V
OUT
SHDN
= 2.5V, V
IN
= V
OUT
V
IN
= –40V, V
OUT
= 0V
V
IN
= V
OUT
= 5.0V, I
GATE
= –1µA
V
IN
= V
OUT
= 12V to 34V, I
GATE
= –1µA
GATE = V
IN
= V
OUT
= 12V
Fast Shutdown, GATE = 20V, V
IN
= V
OUT
= 12V
Gentle Shutdown, GATE = 20V, V
IN
= V
OUT
= 12V
C
GATE
= 2.2nF, UV or OV Fault
C
GATE
= 2.2nF,
SHDN
Falling, V
IN
= V
OUT
= 12V
l
l
l
l
l
l
l
l
l
l
MIN
2.5
–40
TYP
MAX
34
60
UNITS
V
V
µA
µA
µA
mA
V
µA
µA
µA
V
V
µA
mA
µA
µs
µs
4365fa
10
10
25
–1.2
1.8
2.2
6
100
20
3
7.4
–12
31
50
150
3.6
8.4
–20
50
90
2
250
50
100
150
–1.8
2.4
30
250
50
4.2
9.8
–30
72
150
4
350
Reverse Input Supply Current
Input Supply Undervoltage Lockout
V
OUT
Input Current
l
l
l
l
l
l
l
I
GATE(SLOW)
N-Channel Gate Gentle Pull Down Current
t
GATE(SLOW)
N-Channel Gentle Turn Off Delay
For more information
www.linear.com/LTC4365
3
LTC4365
elecTrical characTerisTics
SYMBOL
t
RECOVERY
UV, OV
V
UV
V
OV
V
UVHYST
V
OVHYST
I
LEAK
t
FAULT
SHDN
V
SHDN
I
SHDN
t
START
t
SHDN(F)
t
LOWPWR
FAULT
V
OL
I
FAULT
FAULT
Output Voltage Low
FAULT
Leakage Current
I
FAULT
= 500µA
FAULT
= 5V, V
IN
= 34V
l
l
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 2.5V to 34V, unless otherwise noted. (Note 2)
PARAMETER
GATE Recovery Delay Time
CONDITIONS
V
IN
= 12V, Power Good to ΔV
GATE
> 0V
LTC4365, C
GATE
= 2.2nF
LTC4365-1, C
GATE
= 2.2nF
UV Falling
→
ΔV
GATE
= 0V
OV Rising
→
ΔV
GATE
= 0V
l
l
MIN
26
0.6
492.5
492.5
20
20
TYP
36
1
500
500
25
25
1
MAX
49
1.5
507.5
507.5
32
32
±10
2
UNITS
ms
ms
mV
mV
mV
mV
nA
µs
UV Input Threshold Voltage
OV Input Threshold Voltage
UV Input Hysteresis
OV Input Hysteresis
UV, OV Leakage Current
UV, OV Fault Propagation Delay
l
l
l
l
V = 0.5V, V
IN
= 34V
Overdrive = 50mV
V
IN
= V
OUT
= 12V
SHDN
Falling to ΔV
GATE
= 0V
SHDN
= 0.75V, V
IN
= 34V
SHDN
Rising to ΔV
GATE
> 0V, V
IN
= V
OUT
= 12V
V
IN
= V
OUT
= 12V
V
IN
= V
OUT
= 12V
LTC4365
LTC4365-1
l
l
SHDN
Input Threshold
SHDN
Input Current
Delay Coming Out of Shutdown Mode
SHDN
to
FAULT
Asserted
Delay from Turn Off to Low Power Operation
l
l
l
l
l
l
0.4
400
0.75
800
1.5
1.2
±10
1200
3
55
2
0.4
±20
V
nA
µs
µs
ms
ms
V
nA
26
0.3
36
0.7
0.15
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; all voltages are referenced to
GND unless otherwise noted.
Note 3.
These pins can be tied to voltages below –0.3V through a resistor
that limits the current below 1mA.
Note 4.
The GATE pin is referenced to V
OUT
and does not exceed 44V for
the entire operating range.
4
4365fa
For more information
www.linear.com/LTC4365
LTC4365
Typical perForMance characTerisTics
V
IN
Operating Current vs
Temperature
100
SHDN
= 2.5V
V
OUT
= V
IN
V
IN
= 34V
20
I
VIN
(µA)
I
VIN
(µA)
15
10
20
V
IN
= 2.5V
0
–50
–25
75
0
50
25
TEMPERATURE (°C)
100
125
5
0
–45°C
–1200
25°C
I
VIN
(µA)
60
V
IN
= 12V
70°C
25°C
–400
30
25
V
IN
Shutdown Current vs V
IN
V
IN
= V
OUT
SHDN
= 0V
125°C
400
V
IN
Current vs V
IN
(–40 to 60V)
SHDN
= UV = 0V
0
–45°C
25°C
80
40
–800
125°C
0
5
10
15
20
V
IN
(V)
25
30
35
–1600
–50
–25
0
V
IN
(V)
25
50
75
4365 G03
4365 G01
4365 G02
V
OUT
Operating Current vs
Temperature
200
SHDN
= 2.5V
V
IN
= V
OUT
V
OUT
= 34V
V
OUT
= 12V
80
I
VOUT
(µA)
20
V
OUT
Shutdown Current vs
Temperature
25
SHDN
= 0V
V
IN
= V
OUT
15
I
VOUT
(µA)
V
OUT
= 34V
10
V
OUT
= 12V
20
V
OUT
Current vs Reverse V
IN
V
OUT
= 0V
160
–45°C
15
25°C
10
125°C
5
V
OUT
= 2.5V
I
VOUT
(µA)
120
40
0
–50
V
OUT
= 2.5V
5
–25
0
75
25
50
TEMPERATURE (°C)
100
125
0
–50
–25
0
25
50
75
TEMPERATURE (°C)
100
125
0
0
–10
–30
–20
V
IN
(V)
–40
–50
4365 G06
4365 G04
4365 G05
12
10
8
∆V
GATE
(V)
6
4
2
0
GATE Drive vs V
IN
V
OUT
= 0V
GATE Drive vs Temperature
10
V
IN
= V
OUT
= 34V
8
V
OUT
= V
IN
∆V
GATE
(V)
6
I
GATE
= –1µA
V
IN
= V
OUT
= 12V
I
GATE(UP)
(µA)
–20
–25
GATE Current vs GATE Drive
V
IN
= V
OUT
= 12V
125°C
–15
25°C
4
V
IN
= V
OUT
= 2.5V
–10
–45°C
2
T = 25°C
I
GATE
= –1µA
0
5
10
15
20
V
IN
(V)
25
30
35
0
–50
–5
0
–25
75
0
50
25
TEMPERATURE (°C)
100
125
0
2
6
4
∆V
GATE
(V)
8
10
4365 G09
4365 G07
4365 G08
4365fa
For more information
www.linear.com/LTC4365
5
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