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100V Flyback Controller Now Offered in Military ­55°C to 150°C MP Grade

MILPITAS, CA ­ March 18, 2015 ­ Linear Technology Corporation announces a new military MP grade version of the LT3748, a high input voltage isolated flyback DC/DC controller. This device simplifies the design of an isolated DC/DC converter by not requiring an opto­isolator, third winding or signal transformer for feedback since the output voltage is sensed from the primary­side flyback signal. The LT3748 operates over a 5V to 100V input voltage range and drives an external N­channel power MOSFET, making it well suited for a wide variety of automotive, industrial, telecom and datacom applications.
The LT3748 operates in boundary mode, which is a variable frequency current mode control switching scheme, resulting in +/­5% typical regulation over the full line, load and temperature range. Boundary mode also permits the use of a smaller transformer compared to equivalent continuous conduction mode designs. The output voltage is easily set by two external resistors and the transformer turns ratio. Several off­the­shelf transformers are identified in the data sheet that can be used for numerous applications. The high level of integration and the use of boundary mode operation results in a simple, clean application solution to the traditionally tough problem of isolated power delivery.
Additional features include an onboard low drop regulator for IC power, programmable soft start, undervoltage lockout, adjustable current limit and output voltage temperature compensation.
The LT3748MP operating junction temperature is from ­55°C to 150°C and the device is housed in a MSOP­16 package with 4 pins removed for additional high voltage pin spacing. The 1,000 piece price starts at $9.25 each. For more information, visit www.linear.com/product/LT3748.

Summary of Features: LT3748MP

­55°C to 150°C Junction Temperature

Operation

VIN Range from 5V to 100V

No Opto­Isolator, Transformer or Third

Winding Required for Feedback Drives External N­channel Power MOSFET

Current Mode Control

Boundary Mode Operation

VOUT Set with Two External Resistors

100V Isolated Flyback Operates Over ­55°C to 150°C



Off­the­Shelf Transformers Programmable Soft­Start Programmable Under Voltage Lockout Output Voltage Temperature Compensation

Click Photo for High­Res Image

The USA list pricing shown is for budgetary use only. International prices may differ due to local duties, taxes, fees and exchange rates.

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 over 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, µModule® subsystems, and wireless sensor network products. For more information, visit
www.linear.com.

, LT, LTC, LTM, Linear Technology, the Linear logo and &µModule are registered trademarks of Linear
Technology Corp. All other trademarks are the property of their respective owners.

Worldwide Contacts North America and General Information

John Hamburger
Tel: (408) 432­1900 ext. 2419 jhamburger@linear.com
Doug Dickinson
Tel: (408) 432 1900 ext. 2233 ddickinson@linear.com

China (PRC)

Fanny Lau
Tel: 852­2428­0303 flau@linear.com
Angela Ao
Tel: (8610)6522 8081 angela.ao@ebacomms.com

Japan

Yoshikazu Funasaki Tel: 81­3­5226­7291 yfunasaki@linear.com
Takashi Matsuda
Tel: +81­3­3255­8411 linear@chugai­ad.co.jp

Korea

Desiree Park
Tel: +82­2­565­6625 desiree@ezwire.com

Taiwan

Alice Wang
Tel: +886­2­28974705 alice@ezwire.com

Germany

Ralf Stegmann
Tel: +49 (0) 71319234­11 ralf@ezwire.com

UK & Nordic

Alan Timmins
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Italy

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Tel: +33 1 4614 87 09 clotilde@ezwire.com

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