LINEAR TECHNOLOGY CORPORATION 
By News Release ? www.linear.com
High Voltage Surge Stopper with Current Limit Shields Sensitive Electronics from Transients Beyond 100VMILPITAS, 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
? 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 & NordicJohn Hamburger, Director Marketing Alan Timmins Communications alan@ezwire.com jhamburger@linear.comTel: +44-1-252-629937
Tel: 408-432-1900 ext 2419
Doug Dickinson, Media Relations Manager ddickinson@linear.com
Tel: 408-432-1900 ext 2233
| distribué par | Ce noodl a été diffusé par Linear Technology Corporation et initialement mise en ligne sur le site http://www.linear.com. La version originale est disponible ici. Ce noodl a été distribué par noodls dans son format d'origine et sans modification sur 2012-01-16 23:09:33 PM et restera accessible depuis ce lien permanent. Cette annonce est protégée par les règles du droit d'auteur et toute autre loi applicable, et son propriétaire est seul responsable de sa véracité et de son originalité. |
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