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Converter simplifies DC/DC design process

Posted: 26 Jan 2006 ?? ?Print Version ?Bookmark and Share

Keywords:SiC714CD10? SiC711CD10? MOSFET? converters? Vishay?

line amplifier ICs

Vishay Intertechnology Inc. released two new high-speed converter solutions that integrate the control MOSFET, the synchronous MOSFET, and driver circuit in a PowerPAK MLF 10-by-10mm package. The new products promise to simplify the single and multiphase DC/DC design process and are said to provide 3 percent higher efficiency compared with discrete solutions.

The SiC714CD10 and SiC711CD10 converters can be used along with any PWM IC or ASIC to produce a highly efficient buck converter. A low-side MOSFET control pin enables pre-biased start-up, which prevents an undesirable sinking current from a pre-charged output capacitor from causing problems, particularly in POL and server applications.

The SiC714CD10 is rated for input voltages from 3.3V to 16V, delivers up to 27A of continuous output current in still air, and is designed for a 10 percent duty ratio. Typical on-resistance values are 3 m? for the low-side and 10.2 m? for the high-side MOSFET.

The SiC711CD10 is rated for input voltages from 3.3V to 16V and a 40 percent duty ratio. This device provides continuous output current up to 25A. Typical on-resistance values are 4 m? for both the high- and low-side MOSFETs.

Both devices are optimized for 12V to logic level conversion and are rated for a switching frequency range of 100kHz to greater than 1MHz. Additionally, the break-before-make operation provides "shoot-thru" immunity and minimizes dead time. The SiC714CD10 and SiC711CD10 converters also feature undervoltage lockout and a turn-on/turn-off capability. An internal bootstrap diode also helps reduce the number of external components required.

Samples and production quantities of the new MOSFETs with integrated driver are currently available, with lead times of 12 weeks for larger orders.

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