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DC/DC regulator system delivers 97.3 percent efficiency

Milpitas, Calif. — Linear Technology Corp. has extended 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, the first device in a new family of buck-boost products, operates from 4.5 VIN to 20 VIN ; regulates an output voltage from 0.8 V to16 V and delivers an output power up to 150 W.

The LTM4605 provides a compact regulator solution in applications such as networking, industrial and automotive systems and high-power battery operated devices. The device integrates a synchronous buck-boost DC/DC controller, four N-channel MOSFETs, input and output bypass capacitors and compensation circuitry in a 15 x 15 x 2.8-mm 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, said Linear.

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 : 4.5 V to 20 V, VOUT : 12 V, IOUT : 5 A). Whereas other topologies such as Single Ended Primary Inductor Converter (SEPIC) require as many as 20 components and custom magnetics, this buck-boost uModule solution uses only eight components and an off-the-shelf inductor, according to Linear. The efficiency of a comparable SEPIC circuit is approximately 76% to 84%.

In addition, to reduce undesirable frequency harmonics, the LTM4605 is phase-lockable to an external clock frequency ranging from 200 kHz to 400 kHz. Safety features include over-voltage and foldback current protection. The LTM4605 is offered for operation from -40°C to 85°C temperature range.

Pricing: Starts at $18.85 each in quantities of 1,000
Product information: LTM4605

Linear Technology Corp. , 1-408-432-1900, www.linear.com

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