18V 1.25MHz buck regulator has 30ns switch on

June 17, 2020 //By Nick Flaherty
The AOZ6762DI and AOZ6763DI fixed-frequency synchronous buck regulator devices from Alpha and Omega have 30ns minimum on-time for noise-sensitive applications
The AOZ6762DI and AOZ6763DI fixed-frequency synchronous buck regulator devices from Alpha and Omega Semiconductor have 30ns minimum on-time for noise-sensitive applications

Alpha and Omega Semiconductor has launched a synchronous buck regulator series for low noise applications.

The AOZ6762DI and AOZ6763DI are capable of delivering 2A and 3A, respectively, with up to 15W output power and a 30ns switch on time. The buck regulator devices have a low on-resistance power stage and are packaged in a 3mm x 3mm DFN 8-lead package with an exposed thermal pad, allowing cooler power conversion for a variety of consumer and networking equipment such as wireless AP/routers, set-top boxes, cable modems, audio equipment, and LCD TVs.

The power stage consists of two power MOSFETs and is optimised for synchronous switching at 1.25MHz to minimise both switching and conduction losses. The buck regulator series reaches 90 percent efficiency at full load operation and when operating in low output current conditions runs 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 ercent efficiency at 10mA load operation. This feature enables system designers to achieve the low standby power required to meet the “One Watt Initiative.”

The 1.25MHz switching frequency of AOZ6762 and AOZ6763 buck regulator devices enables the use of smaller external components, such as inductors and capacitors, reducing PCB footprint and component costs. It also allows improved transient response and reduces the side-band interference in wireless applications.

This high switching frequency for the buck regulator combined with low minimum controllable on-time enables low output voltages from a 12V bus for next-generation SoCs, FPGAs, and ASICs. External compensation makes it easy for the user to trade off transient response and output ripple requirements with various output filters.

“Features such as high fixed-frequency operation and low minimum controllable on-time of 30ns make AOZ6762DI and AOZ6763DI uniquely suited to noise-sensitive applications such as wireless routers and audio applications,” said Kenny Hu, Power IC Marketing Manager at AOS. “The thermally enhanced package combined with high efficiency across the whole load range

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