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36V, 4A Synchronous Step-Down Regulator Now Offered in
High Temperature “H” Grade & High Reliability “MP” Grade

MILPITAS, CA – October 12, 2011 – Linear Technology announces the high temperature (H-grade) and High Reliability (MP-grade) versions of the LT3690. This 36V input capable, synchronous step-down switching regulator can deliver up to 4A of continuous output current at efficiencies as high as 93%. The LT3690 operates within a VIN range of 3.9V to 36V, and offers transient protection to 60V, making it well suited for load dump and cold-crank conditions found in automotive applications. The LT3690's Burst Mode® operation requires only 70µA of quiescent current, ideal for applications such as automotive or telecom systems, which demand always-on operation and optimum battery life. Switching frequency is user-programmable from 170kHz to 1.5MHz, enabling the designer to optimize efficiency while avoiding critical noise-sensitive frequency bands. The combination of its 4mm x 6mm
QFN-26 package and high switching frequency keeps external inductors and capacitors small, providing a compact, thermally efficient footprint.

The H-grade version operates from -40°C to a junction temperature of 150°C, and is guaranteed and tested throughout this temperature range. Similarly, the MP-grade version operates from -55°C to a junction temperature of 150°C, and is guaranteed and tested throughout this temperature range. Electrical specifications for the H-grade and the MP-grade are identical to the E and I grades. They are ideal for automotive, industrial and military applications, which are subject to high ambient temperatures.

Both the LT3690HUFE and the LT3690MPUFE are available in 26-lead 4mm x 6mm QFN packages. Pricing starts at $5.70 and $14.70 each, respectively, for 1,000-piece quantities and are available from stock. For more information, visit

Summary of Features:

  • High Temperature & Reliability
    Versions of 36V, 4A Synchronous Monolithic Step-Down Regulators
  • Wide Input Range: Operation from
    3.9V to 36V, Overvoltage Lockout
    Protects Circuits Through 60V Transients
  • 4A Continuous Maximum Output Current
  • Integrated 30mOhm N-Channel Synchronous Switch
  • 70µA IQ at 12VIN to 3.3VOUT
  • Low Ripple Burst Mode® Operation Allows Output Ripple <15mVP-P
  • Programmable Input Undervoltage Lockout
  • 0.8V Feedback Reference Voltage
  • Output Voltage 0.8V to 20V
  • Programmable & Synchronizable Oscillator (170kHz to 1.5MHz)
  • Soft-Start-up & Output Voltage Tracking
  • Short-Circuit Robust
  • Power Good Flag
  • Small Thermally Enhanced
    4mm x 6mm QFN Package
  • -55°C to 150°C Temperature
    Range-MP Grade
  • -40°C to 150°C Temperature
    Range-H Grade

36V, 4A (IOUT), Synchronous
Step-Down Switching Regulator


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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, Burst Mode and 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

Doug Dickinson
Tel: (408) 432 1900 ext. 2233
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Angela Ao
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Hitoshi Kasai
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Desiree Park
Tel: +82-2-565-6625
Alice Wang
Tel: +886-2-28974705

Ralf Stegmann
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Simona Labianca
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