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4A buck regulator combines two step-down regulators

Posted: 15 Jul 2011 ?? ?Print Version ?Bookmark and Share

Keywords:dual-channel? buck regulator? POL applications?

Semtech Corp. has announced the latest device in its buck regulator platform. The SC286 is hailed by the company as the world's smallest 4A, dual-channel regulator for point-of-load (POL) applications.

The device combines two step-down regulators each with 15 preset output voltages controlled by four on-chip voltage identification (VID) pins, enabling a compact, overall design footprint of less than 200mm2. This combination of features lets designers optimize power conversion to support more features in less space without the inventory challenges associated with using multiple regulators.

Traditional buck regulators necessitate designing in and qualifying many different parts to accommodate all of the possible voltage variations. The SC286 consolidates these requirements down to just one tiny integrated circuit.

The SC286 supports output currents up to 4A per channel, along with very high power conversion efficiency of up to 95 percent, low shutdown current of 1?A typ., automatic power save for high light-load efficiency, and excellent transient response. With the combination of small size, high efficiency and high performance, the device is targeted for powering a wide range of loads, including analog-to-digital converters, microcontrollers, DSPs and digital ASICs in networking, communications, consumer, industrial and office automation equipment, including router and network cards, printers and LCD TVs.

The SC286 further simplifies power supply design by integrating the regulator, loop compenzation components, power MOSFETs and MOSFET drivers on one chip. This eliminates the need for external loop stabilization components and programming resistors, making component selection and layout much easier, while contributing to the small design footprint.

The SC286 is packaged in a low-profile, thermally enhanced 4 x 4 x 0.6mm MLPQ 28-pad package. For applications requiring one regulator, the SC186 offers the same performance, with a single output.

The SC286 is available immediately in production quantities and is priced at $3.36 each in 3,000-piece lots. The ordering code is SC286ULTRT. Evaluation boards (SC286EVB) are also available.

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