Buck-Boost DC/DC µModule Regulator Uses Few Components & Dissipates Less than 2.4W at 60WOUT without Hot Spots

Nov 5 2007 -MILPITAS, CA
  • Linear Technology Corporation extends its family of DC/DC µModule regulator systems with products that can regulate an output voltage from a variable input voltage greater than, less than or equal to the output voltage. The LTM4605 is the first device in a new family of buck-boost products and operates from 4.5VIN to 20VIN, regulates an output voltage from 0.8V to16V and delivers an output power up to 150W. The LTM4605 integrates a synchronous buck-boost DC/DC controller, four N-channel MOSFETs, input and output bypass capacitors and the compensation circuitry in a 15mm × 15mm × 2.8mm land grid array (LGA) plastic molded package. Only an inductor, feedback and sense resistors and bulk capacitors are required to implement a very low profile, compact and high efficiency design. The LTM4605 provides a compact regulator solution in applications such as networking, industrial and automotive systems and high-power battery operated devices.


    With the LTM4605's on-board proprietary 4-switch synchronous MOSFET design, the product achieves up to 97.3% efficiency in boost mode and up to 97.7% efficiency in buck mode (VIN: 4.5V to 20V, VOUT: 12V, IOUT: 5A). Whereas other topologies such as SEPIC (Single Ended Primary Inductor Converter) require as many as 20 components and custom magnetics, this buck-boost µModule solution uses only eight components and an off-the-shelf inductor. In addition, the efficiency of a comparable SEPIC circuit is approximately 76% to 84%. Furthermore, to reduce undesirable frequency harmonics, the LTM4605 is phase-lockable to an external clock frequency ranging from 200kHz to 400kHz. Safety features include overvoltage and foldback current protection.

    The LTM4605 is offered for operation from –40ºC to 85ºC temperature range. 1,000-piece pricing starts at $18.85 each.

    Summary of Features: LTM4605

    • Single Inductor Buck-Boost Architecture
    • Synchronous 4-Switch Operation for High Efficiency (up to 98%)
    • Wide Input Voltage Range: 4.5V to 20V
    • Wide Output Voltage Range: 0.8V to 16V
    • 1% Set Point Output Voltage Accuracy
    • 15mm × 15mm × 2.8mm LGA Package

    Simplest High Power Buck-Boost DC/DC Solution

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