Power Electronics

Two MicroBuck(tm) Integrated Synchronous Buck Regulators

Vishay Intertechnology, Inc. announced two new devices in the microBuck(tm) family of integrated synchronous buck regulators. The 4-A SiC413 and 10-A SiC417 are dc-to-dc converter solutions featuring an advanced controller IC with gate drivers, two PWM-optimized n-channel MOSFETs (high and low side), and a bootstrap diode in a standalone buck regulator configuration.

The two devices offer a wide input voltage range of 4.75 V to 26 V for the SiC413 and 3 V to 28 V for the SiC417, with minimum output voltages down to 0.6 V and 0.5 V, respectively. The regulators minimize EMI by eliminating PCB traces, while the devices' high- and low-side MOSFETs provide low on-resistance for reduced power losses and better performance.

With a 500-KHz operating frequency, the SiC413 is optimized for compact dc-to-dc point-of-load power supplies; 5-V, 12-V, and 24-V distributed system power systems; processor and memory voltage regulators in set-top boxes, DVD players, and LCD displays; and telecom, networking, and industrial equipment. The SiC413 comes in a 5-mm by 6-mm SO-8 package and can replace as many as four packages commonly used in discrete designs.

The microBuck regulators offer a high power density and improved thermal performance under the full load condition. The devices combine high efficiency of 93 % with high-frequency operation, with the SiC417 capable of operating with all ceramic solutions and switching frequencies up to 1 MHz. In addition, the SiC417's internal programmable LDO may be used to supply 5 V for the gate drive circuits or it may be bypassed with an external 5 V for optimum efficiency and used to drive external n-channel MOSFETs or other loads.

Samples and production quantities of the new microBuck regulators are available now, with lead times of eight weeks for initial orders. Pricing for U.S. delivery in 1,000-piece quantities is $0.98 each for the SiC413, and $1.68 each for the SiC417.

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