Synchronous Buck Regulators offer high-frequency operation.

Press Release Summary:

Respectively operating from 4.75-26 V and 3-28 V input, microBuck(TM) SiC413 (4 A) and SiC417 (10 A) are DC/DC converters that feature 2 PWM-optimized n-channel MOSFETS, bootstrap diode, and controller IC with gate drivers. Model SiC417 also provides programmable LDO and has 0.5 V output (min), while SiC413 offers output voltages down to 0.6 V. Both devices operate with efficiency ratings of 93%, with 500 KHz operating frequency for SiC413 and up to 1 MHz for SiC417.

Original Press Release:

Vishay Releases Two New microBuck(TM) Integrated Synchronous Buck Regulators with Wide Voltage Range to 28 V, 93 % Efficiency, and High-Frequency Operation to 1 MHz

4-A SiC413 and 10-A SiC417 DC/DC Converters Feature Two N-Channel MOSFETS, Bootstrap Diode, and Controller IC, With the SiC417 Also Providing Programmable LDO

MALVERN, PENNSYLVANIA - July 22, 2009 - Vishay Intertechnology, Inc. (NYSE: VSH) today 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 microBuck family of products leverages Vishay's unique combination of discrete MOSFET design, IC expertise, and packaging capability to provide customers with cost-effective, high-performance integrated solutions. The resulting integrated solutions deliver a significant reduction in board space requirements. This benefits the designer by giving more space for critical system functionality.

The two devices released today 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 telecomm, 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.

Featuring the 5-mm by 5-mm MLPQ 32-pin package, the SiC417 offers the small form factor needed for super-compact, battery-operated portable computing. The constant-on-time controller provides superior transient response. This can reduce output filter cost for a given load regulation target. The device's ultrasonic power save mode delivers improved light-load efficiency, which is ideal for embedded applications in notebook, desktop, and server computers; printers, DSL, set-top boxes, and HDTVs; and digital consumer, networking, and telecommunications equipment.

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.

For reliable operation and easy system integration, both devices feature cycle-by-cycle current limiting, enable pin, internal soft start, under-voltage lockout, over-voltage protection, and thermal shutdown at +150 °C. The SiC417 also provides the power good signal, programmable current limit, and programmable LDO with 200 mA of drive capability.

Samples and production quantities of the new microBuck regulators are available now, with lead times of eight weeks for initial orders.

Vishay Intertechnology, Inc., a Fortune 1,000 Company listed on the NYSE (VSH), is one of the world's largest manufacturers of discrete semiconductors (diodes, rectifiers, MOSFETs, optoelectronics, and selected ICs) and passive electronic components (resistors, capacitors, inductors, sensors, and transducers). These components are used in virtually all types of electronic devices and equipment, in the industrial, computing, automotive, consumer, telecommunications, military, aerospace, and medical markets. Its product innovations, successful acquisition strategy, and "one-stop shop" service have made Vishay a global industry leader. Vishay can be found on the Internet at

microBuck is a trademark of Siliconix incorporated

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