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4A buck regulator touts ultra-small 200mm2 size

Posted: 18 Jul 2011     Print Version  Bookmark and Share

Keywords:regulator  buck regulator  dual-channel  point-of-load 

Semtech Corp. reveals the SC286 touted as the smallest 4A, dual-channel regulator for point-of-load (POL) applications with a compact, overall design footprint of less than 200mm2.

It combines two step-down regulators each with 15 preset output voltages controlled by four on-chip voltage identification (VID) pins in a compact form that offers optimised 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 per cent, low shutdown current of 1µA 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 analogue-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 compensation components, power MOSFETs and MOSFET drivers on one chip. This eliminates the need for external loop stabilisation 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 4x4x0.6mm 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 Rs.150 ($3.36) each in 3,000-piece lots. The ordering code is SC286ULTRT. Evaluation boards (SC286EVB) are also available. Semtech offers comprehensive design assistance, including field- and factory-based support.

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