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DC/DC regulator delivers up to 120W

Posted: 13 Feb 2009 ?? ?Print Version ?Bookmark and Share

Keywords:buck boost regulator? DC/DC? MOSFET?


Linear Technology Corp. has extended its family of buck-boost DC/DC ?Module regulator systems with a third pin-compatible product, the LTM4609, a high voltage and high efficiency DC/DC system.

The LTM4609 regulates an output voltage from a variable input voltage greater than, less than or equal to the output voltage. The device operates from 4.5VIN to 36VIN and regulates an output voltage from 0.8V to 34V and can deliver an output power up to 120W. The LTM4609 integrates a synchronous buck-boost DC/DC controller, four n-channel MOSFETs, input and output bypass capacitors and the compensation circuitry in a small 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 device has applications in point-of-load and intermediate-bus regulation in networking, industrial and automotive systems and high power battery-operated devices.

The device's onboard proprietary 4-switch synchronous MOSFET design enables up to 98.3 percent efficiency in boost mode and 97.3 percent efficiency in buck mode (condition: VIN: 6.5V to 36V, VOUT: 30V, IOUT: 2A). Unlike Single Ended Primary Inductor Converter (SEPIC) topologies requiring as many as 20 components and custom magnetics, the LTM4609 uses only six external components, including an off-the-shelf inductor, ensuring a very simple PCB layout. Furthermore comparable SEPIC circuits achieve significantly lower efficiency in the range of 76 percent to 84 percent. In order to reduce undesirable frequency harmonics, the LTM4609 is phase-lockable to an external clock frequency ranging from 200kHz to 400kHz. Safety features include overvoltage and foldback current protection.

The LTM4609 is offered for operation from -40C to 85C with 125C maximum junction temperature. Pricing for 1,000-piece quantity starts at $22.55.

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