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Linear Technology Corporation : High Voltage Surge Stopper with Current Limit Shields Sensitive Electronics from Transients Beyond 100V

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01/16/2012 | 11:37pm CET

News Release ? www.linear.com

High Voltage Surge Stopper with Current Limit Shields Sensitive Electronics from Transients Beyond 100V

MILPITAS, CA - January 16, 2012 - Linear Technology Corporation introduces the LT4363, an overvoltage protection controller that provides overvoltage and overcurrent protection to high- availability electronic systems. Supply voltages surge whenever currents flowing through long inductive power buses change abruptly. Also, automotive batteries experience a condition known as load-dump, where the voltage can stay elevated for many milliseconds. Traditional protection circuitry relies on bulky inductors, capacitors, fuses, and transient voltage suppressors. Instead, the LT4363 creates a robust, adaptable, and
space-efficient design with simple control of an N-channel MOSFET. Only the controller and the MOSFET suffer the high voltage surge; downstream components can afford lower voltage ratings, thereby saving costs.
The LT4363 controller builds on Linear's popular first-generation LT4356 device by extending overvoltage protection capabilities beyond 100V without sacrificing overcurrent protection. The LTC4363 reacts quickly to overcurrent and short-circuit faults at the load, limiting the current to a safe value set by a sense resistor.
Armed with a 100V maximum rating and operational capability down to 4V (cold-crank), the LT4363 makes for an ideal barrier against badly behaving supplies. A simple clamp on the controller supply extends protection beyond the native 100V. It even survives reversed battery
connections to ?60V. During voltage surges, the output is regulated to a voltage set by a resistive
divider, allowing the load to operate safely and smoothly through transient events. Overvoltage

High Voltage Surge Stopper with Current Limit Shields page 2

Sensitive Electronics from Transients Beyond 100V

and undervoltage comparator inputs ensure that the LT4363 remains off outside a user-defined voltage range. To limit the thermal stress on the power MOSFET, the LT4363 uses a VDS- accelerated fault timer. If the fault persists, a warning is issued before the MOSFET is shut off. By limiting the MOSFET gate slew-rate with a resistive-capacitive (RC) network, the controller can be adapted for inrush control in Hot SwapTM applications. In the shutdown state the LT4363 sips just 7µA of supply current, preserving battery life. A built-in thermal shutdown occurs around 150oC.
The LT4363 is available in two options: the LT4363-1 latches off after a fault, whereas
the LT4363-2 will retry after a long cool-down period. Specified over the full commercial and industrial temperature ranges, the LT4363 is offered in 12-pin DFN (4mm x 3mm) and MSOP packages, and a 16-pin SO package with enhanced high-voltage pin spacing. Pricing begins at
$2.48 each for 1,000-piece quantities and the device is now available in production quantities. For more information, visit www.linear.com/product/LT4363

Photo Caption: Overvoltage & Overcurrent Protection IC Suppresses High Voltage Surges Summary of Features: LT4363

? Withstands Surges Over 100V with Vcc Clamp

? Wide Operating Voltage Range: 4V to 80V

? Adjustable Output Clamp Voltage

? Fast Overcurrent Limit: Less Than 5?s

? Reverse Input Protection to -60V

? Adjustable UV/OV Comparator Thresholds

? Low 7?A 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)

? 12-Lead MSOP, (4mm x 3mm) DFN & 16-Lead SO Packages

High Voltage Surge Stopper with Current Limit Shields page 3

Sensitive Electronics from Transients Beyond 100V

About Linear Technology

Linear Technology Corporation, a member of the S&P 500, has been designing, manufacturing and marketing a broad line of high performance analog integrated circuits for major companies worldwide for three decades. The Company's products provide an essential bridge between our analog world and the digital electronics in communications, networking, industrial, automotive, computer, medical, instrumentation, consumer, and military and aerospace systems. Linear Technology produces power management, data conversion, signal conditioning, RF and interface
ICs, and µModule® subsystems.

LT, LTC, LTM, µModule and are registered trademarks and Hot Swap is a trademark of Linear Technology

Corp. All other trademarks are the property of their respective owners.

Press Contacts: North America / Worldwide UK & Nordic

John Hamburger, Director Marketing Alan Timmins Communications alan@ezwire.com jhamburger@linear.com Tel: +44-1-252-629937

Tel: 408-432-1900 ext 2419

Doug Dickinson, Media Relations Manager ddickinson@linear.com

Tel: 408-432-1900 ext 2233

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