LTC4380CDD-3PBF Просмотр технического описания (PDF) - Linear Technology

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LTC4380CDD-3PBF

Low Quiescent Current Surge Stopper

Linear Technology 

LTC4380

Low Quiescent Current

Surge Stopper

Features

n Low Quiescent Current: 8µA Operating, 6µA

Shutdown

n Withstands Surge Voltage Up to the MOSFET Limit

n Wide Operating Voltage Range: 4V to 72V

n Overcurrent Protection

n Selectable Internal 31.5V/50V or Adjustable Gate

Clamp Voltage (Table 1)

n Reverse Input Protection to –60V

n Adjustable Turn-On Threshold

n Adjustable Fault Timer with MOSFET Stress

Acceleration

n Controls N-Channel MOSFET

n Latchoff and Retry Options (Table 1)

n Low Retry Duty Cycle During Faults (Table 1)

n 10-Pin DFN (3mm × 3mm) and MSOP Packages

Applications

n Automotive/Avionic/Industrial Surge Protection

n Hot Swap/ Live Insertion

n High Side Switch for Battery Powered Systems

n Intrinsic Safety Applications

Description

The LTC®4380 low quiescent current surge stopper protects

loads from high voltage transients. Overvoltage protection

is provided by clamping the gate voltage of an external

N-channel MOSFET to limit the output voltage to a safe

value during overvoltage events such as load dump in

automobiles. Fixed gate clamp voltages are selectable for

12V and 24V/28V systems. For systems of any voltage up

to 72V, use the adjustable gate clamp versions. Overcur-

rent protection is also provided.

An internal multiplier generates a TMR pin current pro-

portional to VDS and ID, so that operating time in both

overcurrent and overvoltage conditions is limited in ac-

cordance with MOSFET stress.

The GATE pin can drive back-to-back MOSFETs for reverse

input protection, eliminating the voltage drop and dissi-

pation of a Schottky diode solution. A low 8µA operating

current permits use in always-on and battery powered

applications. An accurate ON pin comparator monitors

the input supply for undervoltage (UV) conditions and

also serves as a shutdown input, reducing the quiescent

current to 6µA.

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

Linear Technology Corporation. All other trademarks are the property of their respective owners.

Typical Application

VIN

12V

(250VPK)

12V, 1A with 250V Overvoltage Protection

FDB33N25

20mΩ

10Ω

249k

33Ω

10k

47nF

12V/1A

OUTPUT CLAMPED

22µF AT 27V

Surge Stopper Limits Output to 27V During Input Surge

100V INPUT SURGE

CTMR = 8.2µF

ILOAD = 1A

0.1µF

68V

CMHZ5266B

DRN GATE

SNS OUT

VCC

ON

GND

LTC4380-2

TMR

FLT

SEL

8.2µF

4380 TA01a

VIN

20V/DIV 12V

VOUT

20V/DIV

12V

27V ADJUSTABLE CLAMP

100ms/DIV

4380 TA01b

4380f

For more information www.linear.com/LTC4380

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