Ultralow VIN DC/DC µModule Regulator with Onboard 5V MOSFET Gate Drive Delivers 15A from Inputs Down to 1.5VIN

Jun 28 2010 - MILPITAS, CA
  • Linear Technology Corporation introduces the LTM4611, a complete switch mode DC/DC µModule® point-of-load regulator capable of generating its own 5V N-channel MOSFET gate drive for very efficient voltage conversion from 3.3VIN or less to loads as low as 0.8V at up to 15A. Alternative traditional low input voltage high power switch mode DC/DC converters with N-channel MOSFETs require a second regulator circuit to provide the 5V gate drive needed for logic level MOSFETs. Conversion efficiencies for the LTM4611 at full load (15A) are 92% for 3.3VIN to 2.5VOUT, 88% for 2.5VIN to 1.5VOUT, and 81% for 1.5VIN to 0.9VOUT. Applications include systems with only 3.3V, 2.8V or 2.5V as the main power rail such as compact data storage and RAID systems, ATCA and optical networking cards, as well as medical and industrial equipment.


    The LTM4611 includes the main DC/DC power circuit and the gate drive circuit plus inductors, MOSFETs, input and output bypass capacitors and compensation circuitry in a small 15mm × 15mm × 4.32mm LGA (Land Grid Array) package weighing only 2.6g. The device boasts ±2% total DC output error over temperature, including line and load regulation as a result of its architecture, precision reference voltage and differential remote sense amplifier—a key specification for loads such as FPGAs and ASICs that require better than ±3% voltage accuracy for optimum performance. To increase output capability to 30A, 45A or 60A, two, three or four LTM4611 DC/DC µModule devices can be paralleled to share current.

    The LTM4611 is rated for operation over the –40ºC to 125ºC operating junction temperature range. The 1,000-piece price starts at $19.45 each. For more information, visit www.linear.com/product/LTM4611.

    Summary Features LTM4611

    • Complete DC/DC System-in-a-Package Regulator 15mm × 15mm × 4.32 mm LGA package
    • Ultralow VIN: 1.5V to 5.5V (6V Abs Max)
    • 0.8V to 5V Output, 15A
    • Differential Remote Sensing for Precision Regulation
    • Clock Synchronizable from 360kHz to 710kHz

    Ultralow VIN 15A DC/DC µModule® Regulator
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