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Linear expands DC/DC uModule regulator systems

Posted: 07 Nov 2007     Print Version  Bookmark and Share

Keywords:buck-boost regulator  DC/DC  input voltage 

Linear Technology Corp. has expanded its family of DC/DC uModule 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 device integrates a synchronous buck-boost DC/DC controller, four N-channel MOSFETs, input and output bypass capacitors and the compensation circuitry in a 15mm x 15mm x 2.8mm LGA plastic molded package. Only an inductor, feedback and sense resistors and bulk capacitors are required to implement a low profile, compact and high efficiency design.

With the LTM4605's on-board proprietary 4-switch synchronous MOSFET design, the product achieves up to 97.3 per cent efficiency in boost mode and up to 97.7 per cent efficiency in buck mode. Unlike other topologies like Single Ended Primary Inductor Converter that requires as many as 20 components and custom magnetics, the buck-boost uModule solution uses only eight components and an off-the-shelf inductor. 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 provides a compact regulator solution in applications such as networking, industrial and automotive systems and high-power battery operated devices and operates from -40?C to 85?C temperature range. Pricing starts at Rs.762.45 ($18.85) each for 1,000-unit quantities.

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