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34V, 2A (Isw), 2.8MHz Micropower Step-Down DC/DC Converter
Offers 150°C Maximum Junction Temperature Operation

MILPITAS, CA - August 20, 2008 - Linear Technology announces the H-Grade version of the LT3481. The LT3481 is a 34V (36V(MAX)), BurstMode®, step-down switching regulator that maintains quiescent current under 50uA.The "H" Grade version operates up to a junction temperature of 150°C, compared to the "E" and "I" Grade versions' 125°C maximum junction temperature. All electrical specifications are identical for the E, I and H. The H Grade parts are tested and guaranteed to the maximum junction temperature of 150°C. They are ideal for automotive, industrial and harsh environment applications that are subject to high ambient temperatures.

The LT3481 operates within a VIN range of 3.3V to 34V(36VMAX), making ideal for load dump or cold-crank conditions found in automotive applications. Its 3.2A internal switch delivers up to 2A of continuous output current to voltages as low as 1.25V. Its 50uA of quiescent current is ideal for "always on" applications such as automotive security systems, which require a very long battery life.

The LT3481HDD is available from stock in a 10-lead 3mm x 3mm DFN package whereas the LT3481HMSE is available in a thermally enhanced MSOP-10 package. Pricing for both versions starts at $4.15 each for 1,000 piece quantities.

 
Summary of Features: LT3481H
Maximum Junction Temperature of 150°C
Wide Input Range: 3.6V to 34V Operating, 36V Maximum
2A Maximum Output Current
Low Ripple Burst Mode Operation 50uA IQ at 12VIN to
3.3VOUT
Output Ripple <15mV
Adjustable Switching Frequency: 300kHz to 2.8MHz
Low Shutdown Current: IQ<1uA
Integrated Boost Diode
Power Good Flag
Saturating Switch Design: 0.18 Ohm On-Resistance
1.265V Feedback Reference Voltage
Output Voltage: 1.265V to 20V
Soft-Start Capability
Synchronizable Between 275kHz to 475kHz
Small 10-Pin Thermally Enhanced MSOP & (3mm x 3mm)
DFN Packages
 


150°C, 34V, 2A (IOUT), 2.8MHz Step-Down
Switching Regulator with IQ<50uA

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About Linear Technology

Linear Technology Corporation, a manufacturer of high performance linear integrated circuits, was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major public companies in 2000. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, uModule™ products, and many other analog functions. Applications for Linear Technology's high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems. For more information, visit www.linear.com.

LT, LTC, LTM, and Burst Mode are registered trademarks and uModule is a trademark of Linear Technology Corp. All other trademarks are the property of their respective owners.


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