LT4356-1 Datasheet PDF - Linear Technology

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LT4356-1
Linear Technology

Part Number LT4356-1
Description Surge Stopper
Page 26 Pages


LT4356-1 datasheet pdf
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LT4356-1/LT4356-2
Surge Stopper
FEATURES
n Stops High Voltage Surges
n Adjustable Output Clamp Voltage
n Overcurrent Protection
n Wide Operation Range: 4V to 80V
n Reverse Input Protection to –60V
n Low 7μA Shutdown Current, LT4356-1
n Adjustable Fault Timer
n Controls N-channel MOSFET
n Shutdown Pin Withstands –60V to 100V
n Fault Output Indication
n Guaranteed Operation to 125°C
n Auxiliary Amplifier for Level Detection Comparator or
Linear Regulator Controller
n Available in (4mm × 3mm) 12-Pin DFN,
10-Pin MSOP or 16-Pin SO Packages
APPLICATIONS
n Automotive/Avionic Surge Protection
n Hot Swap/Live Insertion
n High Side Switch for Battery Powered Systems
n Intrinsic Safety Applications
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 LT®4356 surge stopper protects loads from high voltage
transients. It regulates the output during an overvoltage
event, such as load dump in automobiles, by controlling
the gate of an external N-channel MOSFET. The output is
limited to a safe value thereby allowing the loads to con-
tinue functioning. The LT4356 also monitors the voltage
drop between the VCC and SNS pins to protect against
overcurrent faults. An internal amplifier limits the current
sense voltage to 50mV. In either fault condition, a timer
is started inversely proportional to MOSFET stress. If the
timer expires, the FLT pin pulls low to warn of an impend-
ing power down. If the condition persists, the MOSFET is
turned off. After a cool down period, the GATE pin pulls
up turning on the MOSFET again.
The auxiliary amplifier may be used as a voltage detection
comparator or as a linear regulator controller driving an
external PNP pass transistor.
Back-to-back FETs can be used in lieu of a Schottky diode
for reverse input protection, reducing voltage drop and
power loss. A shutdown pin reduces the quiescent current
to less than 7μA for the LT4356-1 during shutdown. The
LT4356-2 differs from the LT4356-1 during shutdown by
reducing the quiescent current to 60μA and keeping alive
the auxiliary amplifier for uses such as an undervoltage
lockout or always-on regulator.
TYPICAL APPLICATION
4A, 12V Overvoltage Output Regulator
VIN
10mΩ IRLR2908
VOUT
12V
383k
100k
UNDERVOLTAGE
10Ω
VCC
SHDN
IN+
SNS GATE OUT
FB
LT4356DE
AOUT
GND
EN
TMR FLT
4356 TA01
0.1μF
102k
4.99k
VCC
DC-DC
CONVERTER
SHDN GND
FAULT
Overvoltage Protector Regulates Output at
27V During Transient
80V INPUT SURGE
CTMR = 6.8μF
ILOAD = 500mA
VIN
20V/DIV
12V
VOUT
20V/DIV
12V
27V ADJUSTABLE CLAMP
100ms/DIV
4356 TA01b
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LT4356-1/LT4356-2
ABSOLUTE MAXIMUM RATINGS (Notes 1 and 2)
VCC, SHDN ................................................ –60V to 100V
SNS............................. VCC – 30V or –60V to VCC + 0.3V
OUT, AOUT, FLT, EN...................................... –0.3V to 80V
GATE (Note 3) .................................–0.3V to VOUT + 10V
FB, TMR, IN+................................................ –0.3V to 6V
AOUT, EN, FLT, IN+...................................................–3mA
Operating Temperature Range
LT4356C................................................... 0°C to 70°C
LT4356I................................................ –40°C to 85°C
LT4356H ............................................ –40°C to 125°C
Storage Temperature Range
DE12.................................................. –65°C to 125°C
MS, SO .............................................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
MS, SO ............................................................. 300°C
PIN CONFIGURATION
TMR 1
FB 2
OUT 3
GATE 4
SNS 5
VCC 6
TOP VIEW
12 IN+
11 AOUT
10 GND
13
9 EN
8 FLT
7 SHDN
DE PACKAGE
12-LEAD (4mm s 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 13) PCB GND CONNECTION OPTIONAL
TOP VIEW
FB 1
OUT 2
GATE 3
SNS 4
VCC 5
10 TMR
9 GND
8 EN
7 FLT
6 SHDN
MS PACKAGE
10-LEAD PLASTIC MSOP
TJMAX = 125°C, θJA = 120°C/W
TMR 1
FB 2
NC 3
OUT 4
GATE 5
NC 6
SNS 7
VCC 8
TOP VIEW
16 IN+
15 NC
14 AOUT
13 NC
12 GND
11 EN
10 FLT
9 SHDN
S PACKAGE
16-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 100°C/W
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LT4356-1/LT4356-2
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT4356CDE-1#PBF
LT4356CDE-1#TRPBF 43561
12-Lead (4mm × 3mm) Plastic DFN
0°C to 70°C
LT4356IDE-1#PBF
LT4356IDE-1#TRPBF
43561
12-Lead (4mm × 3mm) Plastic DFN
–40°C to 85°C
LT4356HDE-1#PBF
LT4356HDE-1#TRPBF 43561
12-Lead (4mm × 3mm) Plastic DFN
–40°C to 125°C
LT4356CDE-2#PBF
LT4356CDE-2#TRPBF 43562
12-Lead (4mm × 3mm) Plastic DFN
0°C to 70°C
LT4356IDE-2#PBF
LT4356IDE-2#TRPBF
43562
12-Lead (4mm × 3mm) Plastic DFN
–40°C to 85°C
LT4356HDE-2#PBF
LT4356HDE-2#TRPBF 43562
12-Lead (4mm × 3mm) Plastic DFN
–40°C to 125°C
LT4356CMS-1#PBF
LT4356CMS-1#TRPBF LTCNS
10-Lead Plastic MSOP
0°C to 70°C
LT4356IMS-1#PBF
LT4356IMS-1#TRPBF LTCNS
10-Lead Plastic MSOP
–40°C to 85°C
LT4356HMS-1#PBF
LT4356HMS-1#TRPBF LTCNS
10-Lead Plastic MSOP
–40°C to 125°C
LT4356CS-1#PBF
LT4356CS-1#TRPBF
LT4356S-1
16-Lead Plastic SO
0°C to 70°C
LT4356IS-1#PBF
LT4356IS-1#TRPBF
LT4356S-1
16-Lead Plastic SO
–40°C to 85°C
LT4356HS-1#PBF
LT4356HS-1#TRPBF
LT4356S-1
16-Lead Plastic SO
–40°C to 125°C
LT4356CS-2#PBF
LT4356CS-2#TRPBF
LT4356S-2
16-Lead Plastic SO
0°C to 70°C
LT4356IS-2#PBF
LT4356IS-2#TRPBF
LT4356S-2
16-Lead Plastic SO
–40°C to 85°C
LT4356HS-2#PBF
LT4356HS-2#TRPBF
LT4356S-2
16-Lead Plastic SO
–40°C to 125°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT4356CDE-1
LT4356CDE-1#TR
43561
12-Lead (4mm × 3mm) Plastic DFN
0°C to 70°C
LT4356IDE-1
LT4356IDE-1#TR
43561
12-Lead (4mm × 3mm) Plastic DFN
–40°C to 85°C
LT4356HDE-1
LT4356HDE-1#TR
43561
12-Lead (4mm × 3mm) Plastic DFN
–40°C to 125°C
LT4356CDE-2
LT4356CDE-2#TR
43562
12-Lead (4mm × 3mm) Plastic DFN
0°C to 70°C
LT4356IDE-2
LT4356IDE-2#TR
43562
12-Lead (4mm × 3mm) Plastic DFN
–40°C to 85°C
LT4356HDE-2
LT4356HDE-2#TR
43562
12-Lead (4mm × 3mm) Plastic DFN
–40°C to 125°C
LT4356CMS-1
LT4356CMS-1#TR
LTCNS
10-Lead Plastic MSOP
0°C to 70°C
LT4356IMS-1
LT4356IMS-1#TR
LTCNS
10-Lead Plastic MSOP
–40°C to 85°C
LT4356HMS-1
LT4356HMS-1#TR
LTCNS
10-Lead Plastic MSOP
–40°C to 125°C
LT4356CS-1
LT4356CS-1#TR
LT4356S-1
16-Lead Plastic SO
0°C to 70°C
LT4356IS-1
LT4356CS-1#TR
LT4356S-1
16-Lead Plastic SO
–40°C to 85°C
LT4356HS-1
LT4356HS-1#TR
LT4356S-1
16-Lead Plastic SO
–40°C to 125°C
LT4356CS-2
LT4356CS-2#TR
LT4356S-2
16-Lead Plastic SO
0°C to 70°C
LT4356IS-2
LT4356IS-2#TR
LT4356S-2
16-Lead Plastic SO
–40°C to 85°C
LT4356HS-2
LT4356HS-2#TR
LT4356S-2
16-Lead Plastic SO
–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.
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/
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LT4356-1/LT4356-2
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VCC = 12V unless otherwise noted.
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
VCC Operating Voltage Range
ICC VCC Supply Current
IR Reverse Input Current
ΔVGATE GATE Pin Output High Voltage
IGATE(UP) GATE Pin Pull-Up Current
IGATE(DN) GATE Pin Pull-Down Current
VFB
IFB
ΔVSNS
FB Pin Servo Voltage
FB Pin Input Current
Overcurrent Fault Threshold
ISNS SNS Pin Input Current
ILEAK FLT, EN Pins Leakage Current
AOUT Pin Leakage Current
ITMR TMR Pin Pull-up Current
VTMR
ΔVTMR
VIN+
IIN+
IOUT
ΔVOUT
VSHDN
VOL
TMR Pin Pull-down Current
TMR Pin Thresholds
Early Warning Period
IN+ Pin Threshold
IN+ Pin Input Current
OUT Pin Input Current
OUT Pin High Threshold
SHDN Pin Threshold
FLT, EN Pins Output Low
AOUT Pin Output Low
VSHDN = Float
VSHDN = 0V, IN+ = 1.3V, LT4356-1
LT4356I-1, LT4356C-1
LT4356H-1
VSHDN = 0V, IN+ = 1.3V, LT4356-2
LT4356I-2, LT4356C-2
LT4356H-2
VSNS = VCC = –30V, SHDN Open
VSNS = VCC = VSHDN = –30V
VCC = 4V; (VGATE – VOUT)
80V ≥ VCC ≥ 8V; (VGATE – VOUT)
VGATE = 12V; VCC = 12V
VGATE = 48V; VCC = 48V
Overvoltage, VFB = 1.4V, VGATE = 12V
Overcurrent, VCC – VSNS = 120mV, VGATE = 12V
Shutdown Mode, VSHDN = 0V, VGATE = 12V
VGATE = 12V; VOUT = 12V, LT4356I, LT4356C
VGATE = 12V; VOUT = 12V, LT4356H
VFB = 1.25V
ΔVSNS = (VCC – VSNS), VCC = 12V, LT4356I, LT4356C
ΔVSNS = (VCC – VSNS), VCC = 12V, LT4356H
ΔVSNS = (VCC – VSNS), VCC = 48V, LT4356I, LT4356C
ΔVSNS = (VCC – VSNS), VCC = 48V, LT4356H
VSNS = VCC = 12V to 48V
FLT, EN = 80V
AOUT = 80V
VTMR = 1V, VFB = 1.5V, (VCC – VOUT) = 0.5V
VTMR = 1V, VFB = 1.5V, (VCC – VOUT) = 75V
VTMR = 1.3V, VFB = 1.5V
VTMR = 1V, ΔVSNS = 60mV, (VCC – VOUT) = 0.5V
VTMR = 1V, ΔVSNS = 60mV, (VCC – VOUT) = 80V
VTMR = 1V, VFB = 1V, ΔVSNS = 0V
FLT From High to Low, VCC = 5V to 80V
VGATE From Low to High, VCC = 5V to 80V
From FLT going Low to GATE going Low, VCC = 5V to 80V
VIN+ = 1.25V
VOUT = VCC = 12V
VOUT = VCC = 12V, VSHDN = 0V
ΔVOUT = VCC – VOUT; EN From Low to High
VCC = 12V to 48V
ISINK = 2mA
ISINK = 0.1mA
ISINK = 2mA
ISINK = 0.1mA
l
l
l
l
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l
l
l
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l
l
l
l
l
l
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l
l
l
l
l
l
l
l
l
l
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l
l
l
l
l
l
l
4
4.5
10
–4
–4.5
75
5
1.5
1.225
1.215
45
42.5
46
43
5
–1.5
–44
–3.5
–2.5
–195
1.5
1.22
0.48
80
1.22
0.25
0.6
0.4
1
7
7
7
60
60
60
0.3
0.8
–23
–30
150
10
5
1.25
1.25
0.3
50
50
51
51
10
–2.5
–50
–5.5
–4.5
–260
2.2
1.25
0.5
100
1.25
0.3
200
6
0.5
1.4
2
300
2
200
80
1.5
25
30
40
70
100
250
1
2
8
16
–36
–50
1.275
1.275
1
55
55
56
56
22
2.5
4.5
–4
–56
–8.5
–6.5
–315
2.7
1.28
0.52
120
1.28
1
300
14
0.7
1.7
2.1
8
800
8
400
V
mA
μA
μA
μA
μA
μA
μA
mA
mA
V
V
μA
μA
mA
mA
mA
V
V
μA
mV
mV
mV
mV
μA
μA
μA
μA
μA
μA
μA
μA
μA
V
V
mV
V
μA
μA
mA
V
V
V
V
mV
V
mV
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LT4356-1 datasheet pdf
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