New high-current synchronous buck regulator offers high efficiency

New from Allegro MicroSystems Europe the A8672 is a synchronous buck regulator IC capable of delivering high currents (up to 8 A) through the use of low “on” resistance internal switches. It uses valley current mode control, which allows very short “on” times to be achieved and inherently provides improved transient response over traditional switching schemes through the use of a voltage feed-forward loop and frequency modulation during large signal load changes.

The A8672 includes a comprehensive set of diagnostic flags, allowing the host platform to react to a myriad of 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 also provided after a fixed delay to indicate when the output voltage is within regulation. The selectable pulse-by-pulse current limit avoids the need to oversize the inductor to cope with large fault currents.

This device is targeted at the industrial, consumer and computer markets. Typical applications include servers and networking systems that require 5 V or 12 V input stepdown conversions at high output current.

The A8672 is available in a 4 mm x 5 mm, 28-contact QFN package (suffix EG) with exposed pad for enhanced thermal performance.


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