AS7620 high voltage buck regulator offers low 30µA quiescent current, high partial load efficiency and 100% duty cycle for maximizing equipment up-time during power-fail conditions

Unterpremstaetten, Austria - austriamicrosystems (SWX: AMS), a leading global designer and manufacturer of high performance analog ICs for communications, industrial, medical and automotive applications, today expanded its DC-DC converter portfolio with the AS7620, a hysteretic, high efficiency 32V step-down regulator in a small 4x4mm MLPQ 12-pin package.

Ideally suited to maximize up-time of utility metering, sensor interface and other industrial motion control and battery-powered data-acquisition equipment, the AS7620 provides both, "early-power-fail" warning and "power-good" signals to microcontrollers that cannot afford to lose critical data during a power failure or brown-out condition.

The AS7620 DC-DC regulator 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%.

Additionally, an integrated 100% 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 37µA when delivering 500µA of output current and consuming approximately 100µA at 10mA output, which allows for smaller hold-up capacitors or extends operating battery life for portable analyzers.

"austriamicrosystems' AS7620 is the first in a series of high-voltage step-down converters that addresses the peculiar needs of industrial 24V applications, and is industry's first 32V-stepdown converter to provide simultaneously an early-power-fail warning and power-good signal in a compact, thermally efficient package, hereby eliminating external comparators and reducing board space" said Matjaz Novak, Marketing Director Industry & Medical at austriamicrosystems. "When the lights go out, the AS7620 shines with its low operating current and extended supply voltage range that includes a low-drop-out mode to keep that microcontroller running until the input voltage falls below the 90% power-good threshold."

The AS7620 DC-DC converter is compatible with a wide range of low profile inductors and ceramic capacitors and does not require compensation.

Soft-start, current limit and thermal shutdown make this converter fail-safe. During shutdown the current draw is reduced to only 1µA.

The AS7620 DC-DC converter is available now in a 4x4mm MLPQ 12-pin package and is specified for the industrial temperature range of -40°C to +85°C for ambient conditions. Pricing for the AS7630 is $1.36 each. Product-specific information and free samples via austriamicrosystems' online shop ICdirect are available at www.austriamicrosystems.com/03products/AS7620/AS7620.htm

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Electronic picture and block diagram are available on request or at http://www.austriamicrosystems.com/07presscenter/presscenter_start.htm