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

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.