LT4363

High Voltage Surge

Stopper with Current Limit

FeaTures

n

DescripTion

The

LT

®

4363

surge stopper protects loads from high voltage

transients. It regulates the output during an overvoltage

event, such as load dump in vehicles, by controlling the

gate of an external N-channel MOSFET. The output is limited

to a safe value allowing the loads to continue functioning.

The LT4363 also monitors the voltage drop between the

SNS and OUT pins to protect against overcurrent faults.

An internal amplifier limits the voltage across the current

sense resistor to 50mV. In either fault condition, a timer is

started inversely proportional to MOSFET stress. Before 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. The LT4363-1 remains off until reset whereas

the LT4363-2 restarts after a cool down period.

Two precision comparators can monitor the input supply

for overvoltage (OV) and undervoltage (UV) conditions.

When the potential is below the UV threshold, the external

MOSFET is kept off. If the input supply voltage is above the

OV threshold, the MOSFET is not allowed to turn back on.

Back-to-back MOSFETs 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 during shutdown.

n

Withstands Surges Over 100V with V

CC

Clamp

Wide Operating Voltage Range: 4V to 80V

Adjustable Output Clamp Voltage

Fast Overcurrent Limit: Less Than 5µs

Reverse Input Protection to –60V

Adjustable UV/OV Comparator Thresholds

Low 7µA Shutdown Current

Shutdown Pin Withstands –60V to 100V

Adjustable Fault Timer

Controls N-Channel MOSFET

Less Than 1% Retry Duty Cycle During Faults,

LT4363-2

Available in 12-Pin (4mm

×

3mm) DFN, 12-Pin

MSOP and 16-Pin SO Packages

applicaTions

n

Automotive/Avionic/Industrial Surge Protection

Hot Swap™/Live Insertion

High Side Switch for Battery Powered Systems

Intrinsic Safety Applications

L,

LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

No R

SENSE

, ThinSOT and Hot Swap are trademarks of Linear Technology Corporation. All other

trademarks are the property of their respective owners.

Typical applicaTion

4A, 12V Overvoltage Output Regulator with 150V Surge Protection

V

IN

12V

1k

10

0.1µF

127k

SMAJ58A

V

CC

SHDN

UV

49.9k

OV

GATE SNS

OUT

FB

4.99k

V

CC

DC/DC

CONVERTER

ENOUT

GND

TMR

FLT

4363 TA01

FDB33N25

10m

22µF

57.6k

Overvoltage Protector Regulates

Output at 27V During Transient

80V INPUT SURGE

C

TMR

= 6.8µF

I

LOAD

= 500mA

OUTPUT

CLAMP

AT 16V

V

IN

20V/DIV

12V

V

OUT

20V/DIV

LT4363-2

27V ADJUSTABLE CLAMP

SHDN

GND

FAULT

12V

100ms/DIV

4363 TA01b

0.1µF

4363fb

For more information

www.linear.com/LT4363

1

LT4363

absoluTe MaxiMuM raTings

(Notes 1, 2)

V

CC

,

SHDN,

UV, OV ................................... –60V to 100V

SNS, OUT ................................................. –0.3V to 100V

SNS to OUT ................................................. –30V to 30V

GATE (Note 3) ..................................–0.3V to SNS + 10V

ENOUT,

FLT

.............................................. –0.3V to 100V

FB ............................................................. –0.3V to 5.5V

TMR ......................................................................0.5mA

Operating Temperature Range

LT4363C .................................................. 0°C to 70°C

LT4363I................................................–40°C to 85°C

LT4363H ............................................ –40°C to 125°C

LT4363MP ......................................... –55°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

LT4363-1

TOP VIEW

FB

OUT

SNS

GATE

V

CC

SHDN

1

2

3

4

5

6

13

GND

12

11

10

9

8

7

TMR

ENOUT

FLT

GND

UV

GND

FB

OUT

SNS

GATE

V

CC

SHDN

1

2

3

4

5

6

TOP VIEW

12

11

10

9

8

7

TMR

ENOUT

FLT

GND

UV

GND

OUT

SNS

NC

GATE

NC

V

CC

NC

SHDN

1

2

3

4

5

6

7

8

LT4363-1

TOP VIEW

16 FB

15 TMR

14 NC

13 ENOUT

12

FLT

11 GND

10 UV

9

GND

DE PACKAGE

12-LEAD (4mm

×

3mm) PLASTIC DFN

T

JMAX

= 125°C,

θ

JA

= 43°C/W

EXPOSED PAD (PIN 13) IS GND, CONNECTION TO PCB

OPTIONAL

LT4363-2

TOP VIEW

FB

OUT

SNS

GATE

V

CC

SHDN

1

2

3

4

5

6

13

GND

12

11

10

9

8

7

TMR

ENOUT

FLT

GND

UV

OV

FB

OUT

SNS

GATE

V

CC

SHDN

LT4363-2

MS PACKAGE

12-LEAD PLASTIC MSOP

T

JMAX

= 125°C,

θ

JA

= 135°C/W

S PACKAGE

16-LEAD PLASTIC SO

T

JMAX

= 125°C,

θ

JA

= 80°C/W

LT4363-2

TOP VIEW

1

2

3

4

5

6

12

11

10

9

8

7

TMR

ENOUT

FLT

GND

UV

OV

OUT

SNS

NC

GATE

NC

V

CC

NC

SHDN

1

2

3

4

5

6

7

8

16 FB

15 TMR

14 NC

13 ENOUT

12

FLT

11 GND

10 UV

9

OV

DE PACKAGE

12-LEAD (4mm

×

3mm) PLASTIC DFN

T

JMAX

= 125°C,

θ

JA

= 43°C/W

EXPOSED PAD (PIN 13) IS GND, CONNECTION TO PCB

OPTIONAL

MS PACKAGE

12-LEAD PLASTIC MSOP

T

JMAX

= 125°C,

θ

JA

= 135°C/W

S PACKAGE

16-LEAD PLASTIC SO

T

JMAX

= 125°C,

θ

JA

= 80°C/W

4363fb

2

For more information

www.linear.com/LT4363

LT4363

orDer inForMaTion

LEAD FREE FINISH

LT4363CDE-1#PBF

LT4363IDE-1#PBF

LT4363HDE-1#PBF

LT4363CDE-2#PBF

LT4363IDE-2#PBF

LT4363HDE-2#PBF

LT4363CMS-1#PBF

LT4363HMS-1#PBF

LT4363IMS-1#PBF

LT4363MPMS-1#PBF

LT4363CMS-2#PBF

LT4363HMS-2#PBF

LT4363IMS-2#PBF

LT4363MPMS-2#PBF

LT4363CS-1#PBF

LT4363HS-1#PBF

LT4363IS-1#PBF

LT4363MPS-1#PBF

LT4363CS-2#PBF

LT4363HS-2#PBF

LT4363IS-2#PBF

LT4363MPS-2#PBF

TAPE AND REEL

LT4363CDE-1#TRPBF

LT4363IDE-1#TRPBF

LT4363HDE-1#TRPBF

LT4363CDE-2#TRPBF

LT4363IDE-2#TRPBF

LT4363HDE-2#TRPBF

LT4363CMS-1#TRPBF

LT4363HMS-1#TRPBF

LT4363IMS-1#TRPBF

LT4363MPMS-1#TRPBF

LT4363CMS-2#TRPBF

LT4363HMS-2#TRPBF

LT4363IMS-2#TRPBF

LT4363MPMS-2#TRPBF

LT4363CS-1#TRPBF

LT4363HS-1#TRPBF

LT4363IS-1#TRPBF

LT4363MPS-1#TRPBF

LT4363CS-2#TRPBF

LT4363HS-2#TRPBF

LT4363IS-2#TRPBF

LT4363MPS-2#TRPBF

PART MARKING*

43631

43632

43631

43632

LT4363S-1

LT4363S-2

PACKAGE DESCRIPTION

12-Lead (4mm

×

3mm) Plastic DFN

12-Lead (4mm

×

3mm) Plastic DFN

12-Lead (4mm

×

3mm) Plastic DFN

12-Lead (4mm

×

3mm) Plastic DFN

12-Lead (4mm

×

3mm) Plastic DFN

12-Lead (4mm

×

3mm) Plastic DFN

12-Lead Plastic MSOP

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

0°C to 70°C

–40°C to 125°C

–40°C to 85°C

–55°C to 125°C

0°C to 70°C

–40°C to 125°C

–40°C to 85°C

–55°C to 125°C

0°C to 70°C

–40°C to 125°C

–40°C to 85°C

–55°C to 125°C

0°C to 70°C

–40°C to 125°C

–40°C to 85°C

–55°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/

The

l

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T

A

= 25°C. V

CC

= 12V, unless otherwise noted.

SYMBOL

V

CC

I

CC

I

R

ΔV

GATE

I

GATE(UP)

I

GATE(DN)

PARAMETER

Operating Voltage Range

V

CC

Supply Current

Reverse Input Current

GATE Drive

GATE Pull-Up Current

GATE Pull-Down Current

CONDITIONS

LT4363

SHDN

Open, OUT = SNS = 12V

SHDN

= 0V, OUT = SNS = 0V

V

CC

= –60V,

SHDN,

UV, OV Open

V

CC

=

SHDN

= UV = OV = –60V

ΔV

GATE

= (GATE – SNS);V

CC

= OUT

V

CC

= 4V; I

GATE

= –0.5µA, 0µA

9V ≤ V

CC

≤ 80V; I

GATE

= –1µA, 0µA

V

CC

= GATE = OUT = 12V

V

CC

= GATE = OUT = 48V

Overvoltage: FB = 1.5V, GATE = 12V, OUT = 5V

Overcurrent:

ΔV

SNS

= 150mV, V

GATE

= 10V, OUT = 0V

Shutdown/UV Mode:

SHDN

= 0V, GATE = 10V

UV = 1V, GATE = 10V

GATE = 12V; OUT = 8V

l

elecTrical characTerisTics

MIN

4

TYP

0.7

7

–0.5

–3

MAX

80

1.2

20

40

–4

–10

16

–45

–65

UNITS

V

mA

µA

mA

V

µA

mA

µA

4.5

10

–15

–20

75

50

200

1.25

13

–30

–40

150

100

1000

1.275

V

FB

FB Servo Voltage

1.3

V

4363fb

For more information

www.linear.com/LT4363

3

LT4363

elecTrical characTerisTics

SYMBOL

I

FB

ΔV

SNS

PARAMETER

FB Input Current

Current Limit Sense Voltage

ΔV

SNS

= (SNS – OUT)

Current Limit Foldback

I

SNS

I

TMR

SNS Input Current

TMR Pull-up Current, Overvoltage

TMR Pull-up Current, OV Warning

TMR Pull-up Current, Overcurrent

TMR Pull-up Current, Cool Down

TMR Pin Pull-down Current, Cool Down

V

TMR(F)

V

TMR(G)

V

TMR(R)

ΔV

TMR

V

TMR(H)

V

UV

V

UV(HYST)

V

OV

V

OV(HYST)

I

IN

I

LEAK

V

OL

ΔV

OUT(TH)

I

OUT

V

SHDN

V

SHDN(Z)

I

SHDN

t

RESET

D

t

OFF(UV)

t

OFF(OV)

t

OFF(OC)

TMR Fault Threshold

TMR Gate Off Threshold

TMR Restart Threshold

Early Warning Window

TMR Cool Down High Threshold

UV Input Threshold

UV Input Hysteresis

OV Input Threshold

OV Input Hysteresis

UV, OV Input Current

FLT,

ENOUT Leakage Current

FLT,

ENOUT Output Low

OUT High Threshold

OUT Input Current

SHDN

Threshold

SHDN

Open Voltage

SHDN

Current

SHDN

Reset Time

Retry Duty Cycle; Overvoltage

Retry Duty Cycle; Output Short

Overvoltage Turn Off Propagation Delay

Overcurrent Turn Off Propagation Delay

UV = 1.275V

UV = –60V

FLT,

ENOUT = 80V

I

SINK

= 0.1mA

I

SINK

= 2mA

ΔV

OUT

= V

CC

– V

OUT

, ENOUT From Low to High

ENOUT From High to Low

V

CC

= OUT = 12V,

SHDN

Open

V

CC

= OUT = 12V,

SHDN

= 0V

V

CC

= 4V to 80V

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, unless otherwise noted.

CONDITIONS

V

FB

= 1.275V

V

CC

= 12V, OUT = 3V to 12V

V

CC

= 48V, OUT = 3V to 48V

V

CC

= 12V, OUT = 0V to 1V

V

CC

= 48V, OUT = 0V to 1V

OUT = SNS = 3V to 80V

OUT = SNS = 0V

TMR = 1V, FB = 1.5V,

ΔV

DS

= 0.5V

TMR = 1V, FB = 1.5V,

ΔV

DS

= 75V

TMR = 1.325V, FB = 1.5V,

ΔV

DS

= 0.5V

TMR = 1V,

ΔV

SNS

= 100mV,

ΔV

DS

= 0.5V

TMR = 1V,

ΔV

SNS

= 100mV,

ΔV

DS

= 80V

TMR = 3V, FB = 1.5V,

ΔV

SNS

= 0V,

ΔV

DS

= 0V

V

TMR

= 3V, FB = 1.5V,

ΔV

SNS

= 0V,

ΔV

DS

= 0V

TMR Rising

TMR Falling, LT4363-2

V

TMR(G)

– V

TMR(F)

V

CC

= 7V to 80V, TMR Rising

UV Rising

OV Rising

l

MIN

45

48

15

16

TYP

±0.2

50

53

25

27

20

–10

MAX

±1

55

58

35

36

40

–15

–6

–58

–7

–13

–310

–3.5

4

1.31

1.41

0.53

120

5.4

1.31

±1

–2

±2.5

800

9

0.75

3.6

0.5

1

1.7

2.1

2.2

–8

100

2

1

5

1

2.5

UNITS

µA

mV

µA

V

mV

V

mV

V

mV

µA

mA

µA

mV

V

mA

V

µA

µs

%

µs

–1.7

–42

–3

–5

–190

–1

1

1.235

1.335

0.47

80

3.5

1.24

–4

–50

–5

–9

–250

–2.3

2

1.275

1.375

0.5

100

4.3

1.275

12

1.275

7.5

±0.2

–1

±0.5

300

2

l

0.25

1.8

0.5

2.7

0.25

ΔV

OUT(RST)

OUT Reset Threshold

0.6

0.4

–1

1.4

V

CC

= 4V to 80V

SHDN

= 0.4V

SHDN

≤ 0.4V; LT4363-1

V

CC

= 80V, OUT = 16V, FB = 1.5V; LT4363-2

V

CC

= 12V, OUT = 0V, ∆V

SNS

= 100mV; LT4363-2

FB Steps from 0V to 1.5V; OUT = 0V

∆V

SNS

Steps from 0V to 150mV; OUT = 0V

l

–4

1

0.76

2

0.25

1

Undervoltage Turn Off Propagation Delay UV Steps from 1.5V to 1V

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 device pins are positive, all currents out of device pins

are negative. All voltages are referenced to GND unless otherwise specified.

Note 3:

An internal clamp limits the GATE pin to a minimum of 10V above

the OUT pin. Driving this pin to voltages beyond the clamp may damage

the device.

4363fb

4

For more information

www.linear.com/LT4363

LT4363

otherwise noted.

Typical perForMance characTerisTics

1000

Specifications are at V

CC

= 12V, T

A

= 25°C, unless

Supply Current During Shutdown

vs Supply Voltage

(I

CC(SHDN)

vs V

CC

)

OUT = SNS = 0V

Supply Current vs Supply Voltage

(I

CC

vs V

CC

)

8

7

Supply Current During Shutdown

vs Temperature

(I

CC(SHDN)

vs Temperature)

OUT = SNS = 0V

6

5

4

I

CC

(µA)

3

2

1

0

800

6

5

I

CC

(µA)

4

3

2

1

I

CC

(µA)

600

400

200

0

10

20

30

40 50

V

CC

(V)

60

70

80

0

–50

–25

0

25

50

75

TEMPERATURE (°C)

100

125

0

10

20

30

4363 G01

4363 G02

40 50

V

CC

(V)

60

70

80

4363 G03

SHDN

Current vs Temperature

3.0

2.5

2.0

1.5

1.0

0.5

0

–50

SHDN

= 0V

I

GATE(UP)

(µA)

–50

GATE Pull-Up Current vs V

CC

–35

GATE Pull-Up Current vs

Temperature

–40

–30

I

GATE(UP)

(µA)

0

10

20

30

40 50

V

CC

(V)

60

70

80

–30

I

CC(SHDN)

(µA)

SHDN

= 0.4V

–25

–20

–10

–20

–25

75

0

25

50

TEMPERATURE (°C)

100

125

0

–15

–50

–25

4363 G04

4363 G05

0

25

50

75

TEMPERATURE (°C)

100

125

4363 G06

GATE Pull-Down Current vs

Temperature: Overcurrent

200

175

150

I

GATE(DN,OC)

(mA)

125

100

75

50

∆V

SNS

= 150mV

25 OUT = 0V

GATE = 10V

0

–50 –25

0

25

50

75

TEMPERATURE (°C)

I

GATE(DN,OV)

(mA)

200

175

150

GATE Pull-Down Current vs

Temperature: Overvoltage

14

Gate Drive Voltage vs Gate

Pull-Down Current ΔV

GATE

vs I

GATE

V

CC

= SNS = OUT

13

∆V

GATE

(V)

125

100

75

50

SNS = OUT = 5V

25 GATE = 12V

FB = 1.5V

0

–50 –25

0

25

50

75

TEMPERATURE (°C)

12

11

100

125

100

125

10

0

–2

4363 G07

4363 G08

–6

–4

I

GATE

(µA)

–8

–10

4363 G09

4363fb

For more information

www.linear.com/LT4363

5

参数名称	属性值
Brand Name	Linear Technology
是否Rohs认证	符合
厂商名称	Linear ( ADI )
零件包装代码	SOIC
包装说明	SOP,
针数	16
制造商包装代码	S
Reach Compliance Code	compliant
模拟集成电路 - 其他类型	ANALOG CIRCUIT
JESD-30 代码	R-PDSO-G16
JESD-609代码	e3
长度	9.906 mm
湿度敏感等级	1
功能数量	1
端子数量	16
最高工作温度	125 °C
最低工作温度	-40 °C
封装主体材料	PLASTIC/EPOXY
封装代码	SOP
封装形状	RECTANGULAR
封装形式	SMALL OUTLINE
峰值回流温度（摄氏度）	NOT SPECIFIED
座面最大高度	1.752 mm
最大供电电压 (Vsup)	80 V
最小供电电压 (Vsup)	4 V
标称供电电压 (Vsup)	12 V
表面贴装	YES
温度等级	AUTOMOTIVE
端子面层	Matte Tin (Sn)
端子形式	GULL WING
端子节距	1.27 mm
端子位置	DUAL
处于峰值回流温度下的最长时间	NOT SPECIFIED
宽度	3.899 mm

	LT4363MPS-1#PBF	LT4363HDE-2#PBF
描述	LT4363 - High Voltage Surge Stopper with Current Limit; Package: SO; Pins: 16; Temperature Range: -55°C to 125°C	LT4363 - High Voltage Surge Stopper with Current Limit; Package: DFN; Pins: 12; Temperature Range: -40°C to 125°C
Brand Name	Linear Technology	Linear Technology
是否Rohs认证	符合	符合
零件包装代码	SOIC	DFN
包装说明	SOP,	HVSON,
针数	16	12
制造商包装代码	S	DE/UE
Reach Compliance Code	compliant	compliant
模拟集成电路 - 其他类型	ANALOG CIRCUIT	ANALOG CIRCUIT
JESD-30 代码	R-PDSO-G16	R-PDSO-N12
JESD-609代码	e3	e3
长度	9.906 mm	4 mm
湿度敏感等级	1	1
功能数量	1	1
端子数量	16	12
最高工作温度	125 °C	125 °C
最低工作温度	-40 °C	-40 °C
封装主体材料	PLASTIC/EPOXY	PLASTIC/EPOXY
封装代码	SOP	HVSON
封装形状	RECTANGULAR	RECTANGULAR
封装形式	SMALL OUTLINE	SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
峰值回流温度（摄氏度）	NOT SPECIFIED	NOT SPECIFIED
座面最大高度	1.752 mm	0.8 mm
最大供电电压 (Vsup)	80 V	80 V
最小供电电压 (Vsup)	4 V	4 V
标称供电电压 (Vsup)	12 V	12 V
表面贴装	YES	YES
温度等级	AUTOMOTIVE	AUTOMOTIVE
端子面层	Matte Tin (Sn)	Matte Tin (Sn)
端子形式	GULL WING	NO LEAD
端子节距	1.27 mm	0.5 mm
端子位置	DUAL	DUAL
处于峰值回流温度下的最长时间	NOT SPECIFIED	NOT SPECIFIED
宽度	3.899 mm	3 mm

LT4363MPS-1#PBF

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