Synchronous buck regulator targets servers and networking
Capable of delivering high current due to low RDS(on) internal switches, the A8672 synchronous buck converter has been introduced by Allegro MicroSystems. Utilising valley current mode control to achieve very short on-times, the converter targets applications such as servers and networking systems requiring 5 or 12V input step down conversions at high output current.
Through the use of a voltage feed-forward loop and frequency modulation during large signal load changes, valley current mode control provides inherently improved transient response over traditional switcher schemes. A comprehensive set of diagnostic flags are included to allow the host platform to react to different fault conditions.
A fault output indicates when either the temperature is becoming unusually high or a single point failure has occurred, such as the switching node shorted to ground or the timing resistor going open-circuit. A Power OK output is provided after a fixed delay. This indicates when the output voltage is within regulation. The selectable pulse-by-pulse current limit avoids the requirement to oversize the inductor to cope with large fault currents.
Targeted at the industrial, consumer and computer markets, the A8672 is available now in a 4x5x0.75mm, 28-contact QFN package. It is optionally available with exposed pad for enhanced thermal performance.
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