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

Aug 20 2008 -MILPITAS, CA
  • 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 × 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: 0.18Ω 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 × 3mm) DFN Packages

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

     

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