Linear Technology PR: LT3999 36V Monolithic 1A Push-Pull DC/DC Transformer Driver with Programmable Duty Cycle Control

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36V Monolithic 1A Push-Pull DC/DC Transformer Driver with Programmable Duty Cycle Control

MILPITAS, CA - September 22, 2014 - Linear Technology Corporation announces the LT3999, a monolithic push-pull isolated DC/DC transformer driver with two 1A current limited power switches. The LT3999 operates over an input voltage range of 2.7V to 36V, is targeted for power levels up to 15W and can produce a wide range of output voltages. This makes it well suited for automotive, industrial, medical and military applications.
The programmable duty cycle and turns ratio of the transformer sets the output voltage. Several off-the-shelf transformers shown in the data sheet simplify the design. The switching frequency is adjustable from 50kHz to 1MHz and can be synchronized to an external clock. The LT3999 input operating voltage range is set with the precise undervoltage and overvoltage lockouts. The supply current is reduced to less than 1µA during shutdown. A user- defined RC time constant provides an adjustable soft-start capability by limiting the inrush current at start-up and an onboard cross-conduction prevention circuit increases reliability.
The LT3999 is available in thermally enhanced MSOP-10 and 3mm x 3mm DFN-10 packages. The LT3999 E- and I- grade versions operate from a -40°C to 125°C junction temperature. The LT3999 H grade is guaranteed to operate from a -40°C to 150°C operating junction temperature. The LT3999 MP grade is guaranteed to operate from -55°C to
150°C operating junction temperature. Devices are in stock, and the 1,000-piece price starts at $2.75 each for the E- grade. For more information, visit www.linear.com/product/LT3999.

Summary of Features: LT3999

● Wide VIN Range: 2.7V to 36V

● Dual 1A Switches

● Programmable Switching Frequency:

50kHz to 1MHz

● Synchronizable to an External Clock up to

1MHz

● Duty Cycle Control for Output Voltage

Regulation

● Low Noise Topology

● Programmable Input Over & Undervoltage

Lockout

● Cross-Conduction Prevention Circuitry

● Extended & Industrial Grades: -40°C to

125°C Operating Junction Temp

● Automotive Temp Grade: -40°C to 150°C Operating Junction Temp

● Military Temp Grade: -55°C to 150°C Operating Junction Temp

Push-Pull DC/DC Transformer Driver Click Photo for High-Res 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) 432-1900 ext. 2419 jhamburger@linear.com
Doug Dickinson
Tel: (408) 432 1900 ext. 2233 ddickinson@linear.com

China (PRC)

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

Japan

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

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

Taiwan

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

Germany

Ralf Stegmann
Tel: +49 (0) 71319234-11 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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