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32V 500mA buck regulator integrates dual power monitor

Posted: 07 May 2008 ?? ?Print Version ?Bookmark and Share

Keywords:buck regulators? dual power monitors?

austriamicrosystems AG has launched a hysteretic, high-efficiency 32V step-down regulator in a 4mm x 4mm MLPQ 12-pin package, expanding the company's portfolio of DC/DC converters. The AS7620 is said to be the industry's first 32V 500mA buck regulator with integrated dual power monitor. It offers 30?A quiescent current, high partial load efficiency and 100 percent duty cycle for maximizing equipment up-time during power-fail conditions.

Suited for maximizing up-time of utility metering, sensor interface and other industrial motion control and battery-powered DAQ equipment, the AS7620 provides both, early-power-fail warning and power-good signals to MCUs that cannot afford to lose critical data during a power failure or brown-out condition.

The AS7620 is optimized for industrial 24V applications and delivers up to 500mA. Available with a fixed 3.3V output or adjustable output voltage between 1.2V and VIN, the device features a wide input voltage between 3.6V and 32V and offers a high efficiency rate of up to 93 percent. Additionally, an integrated 100 percent duty-cycle extends operation in low-dropout conditions. A pin-selectable peak current limit optimizes inductor selection, reducing component size. Built on a hysteretic architecture, the AS7620 is a power miser when it comes to minimum and partial load operation, operating on less than 37?A when delivering 500?A of output current and consuming approximately 100?A at 10mA output, which allows for smaller hold-up capacitors or extends operating battery life for portable analyzers.

Fail-safe converter
The AS7620 DC/DC converter allows a wide range of low profile inductors and ceramic capacitors and does not require any compensation. Soft-start, current limit and thermal shutdown make this converter fail-safe. During shutdown the current draw is reduced to only 1?A.

The AS7620 DC/DC converter is available now in a 4mm x 4mm MLPQ 12-pin package and is specified for the industrial temperature range of -40C to +85C for ambient conditions. Product-specific information and free samples are available from austriamicrosystems.

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