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Date: 28-03-13

2 Amp step-down PFM/PWM regulator offers better light load efficiency

Exar has announced XRP7674, a new synchronous Pulse Frequency Modulation/Pulse Width Modulation (PFM/PWM) step down voltage regulator with a maximum load current of 2 Amps and operating input voltage up to 18V. XRP7674 offers light load efficiency of better than 90% efficient for output current as low as 50mA.

The XRP7674 is optimized for 5V and 12V inputs and addresses the needs of energy efficient equipment and the latest Energy Star regulations. This includes audio-video equipment such as set-top boxes and gaming systems, telecom, computing peripherals, distributed point-of-load conversions and portable applications where light load efficiency is essential.

"Energy efficient products are not only about energy bill savings, they also run cooler ultimately improving overall reliability and operation," said Eric Pittana, director of marketing, Power Product Line, Exar. "The XRP7674 delivers excellent efficiency for always on points-of-load over a wide range of currents without the additional costs of other solutions."

The XRP7674 is a synchronous current mode PFM/PWM step down (buck) regulator capable of delivering a constant output current up to 2Amps. Reaching up to 95% efficiency, it achieves greater than 85% efficient conversions over a 30mA to 2A load current range. The XRP7674 operates at a fixed 340 kHz switching frequency, with output voltage adjustable down to 0.925V with +/- 2% accuracy across the entire operating range. A dedicated enable pin and programmable soft start provide design flexibility for any point-of-load supply. Built-in current limit, output over voltage and thermal shutdown protection provide the XRP7674 with fail-safe operations.

The XRP7674 offers a package equivalent upgrade to Exar's popular XRP7664.

Availability and price: Now in a RoHS compliant, Halogen Free 8-Pin SOIC Package. Pricing for the XRP7674, in 1,000 unit quantities, starts at $0.89 per unit.

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