LT4356CMS-1 Overvoltage Protection Regulator and Inrush Limiter

FEATURES

Stops High Voltage Surges

Adjustable Output Clamp Voltage

Overcurrent Protection n Wide Operation Range: 4V to 80V

Reverse Input Protection to –60V

Low 7μA Shutdown Current n Adjustable Fault Timer n Controls N-Channel MOSFET

Shutdown Pin Withstands –60V to 100V

Fault Output Indication

Spare Amplifi er for Level Detection Comparator or Linear Regulator Controller

Available in (4mm × 3mm) 12-Pin DFN or 10-Pin MSOP Packages

APPLICATIONS

Automotive/Avionic Surge Protection

Hot Swap/Live Insertion

High Side Switch for Battery Powered Systems

DESCRIPTION

The LT®4356-1 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 continue functioning. The LT4356-1 also monitors the voltage drop between the VCC and SNS pins to protect against overcurrent faults. An internal amplifi er 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 impending power down. If the condition persists, the MOSFET is turned off. The spare amplifi er 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 during shutdown.

TYPICAL APPLICATION

ABSOLUTE MAXIMUM RATINGS

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 .........................................................–3mA

Operating Temperature Range

LT4356C-1 ............................................... 0°C to 70°C

LT4356I-1 ............................................–40°C to 85°C

LT4356H-1 .........................................–40°C to 125°C

Storage Temperature Range

DE12 ..................................................–65°C to 125°C

MS .....................................................–65°C to 150°C

Lead Temperature (Soldering, 10 sec, MS10) ....... 300°C

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