Synchronous buck regulators can be used in noise-sensitive applications

Fixed-frequency synchronous buck regulators introduced by Alpha and Omega Semiconductor have 30ns minimum on-time, suitable for noise-sensitive applications. The AOZ676xDI series of high switching frequency synchronous buck regulators consist of the AOZ6762DI and AOZ6763DI. Both deliver 15W output and the AOZ6762DI delivers 2A, the AOZ6763DI, 3A.

They are packaged in a 3.0 x 3.0mm DFN eight lead package with an exposed thermal pad for cooler power conversion in consumer and networking equipment such as wireless AP/routers, set-top boxes, cable modems, audio equipment, and LCD TVs.

Both offer a low on-resistance power stage, comprised of two power MOSFETs optimised for efficient synchronous switching to minimise both switching and conduction losses.

The AOZ6762DI and AOZ6763DI can achieve over 90 per cent efficiency at full load operation. When operating in low output current conditions, the devices run in a proprietary pulse energy mode (PEM) to achieve high efficiency by reducing switching loss. Under this mode, the regulators can still maintain up to 86 per cent efficiency at 10mA load operation. This enables system designers to achieve the low standby power required to meet the “One Watt Initiative.”

The high switching frequency of AOZ6762 and AOZ6763 enables the use of smaller external components, such as inductors and capacitors, reducing PCB footprint and component costs, advises Alpha and Omega Semiconductor. They also offer better transient response while maintaining fixed frequency switching and reduce the side-band interference in wireless applications, the company says.

High switching frequency combined with low minimum controllable on-time for the AOZ6763 and AOZ6762 enable low output voltages from a 12V bus making them suitable power converters for SoCs, FPGAs, and ASICs using deep sub-micron processes. External compensation makes it easy for the user to trade off transient response and output ripple requirements with various output filters, the company explains.

The AOZ6762DI and the AOZ6763DI are immediately available in production quantities with a lead-time of 12 weeks.

Alpha and Omega Semiconductor (AOS) designs, develops and supplies a range of power semiconductors, including power MOSFET, IGBT, IPM, TVS, HVIC, SiC/GaN, power IC and digital power products. AOS has developed IP and technical knowledge which enables the company to introduce products to address the increasingly complex power requirements of advanced electronics.

AOS’s portfolio of products targets high-volume applications, including portable computers, flat-panel TVs, LED lighting, smartphones, battery packs, consumer and industrial motor controls, and power supplies for TVs, computers, servers, and telecommunications equipment.

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