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Tiny switching regulators promise high efficiency

Posted: 06 Aug 2007 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC step-down converters? switching regulators? OTP protection?

Allegro MicroSystems Inc. has introduced a family of high efficiency switching regulators with high operating frequencies. This SI-8000 series of DC/DC step-down converters are designed for portable and office automation markets.

The SI-8000T (1.5A) and SI-8000F (3.5A) series offer reduced die sizes, between 62 percent and 84 percent of the previous generation for the same current levels. The reduction of die size also improves IC response speed, making higher oscillation frequencies attainable. The SI-8000H provides a 5.5A output current.

By connecting an open collector transistor, the user is able to set an on/off control for output voltage. Many of these devices offer a soft-start option that is set by an external capacitor at pin 5. All devices within this series provide under-voltage lock out protection to avoid abnormal IC operation when the input voltage is less than the minimum operating level. Auto-regression OCP and OTP protection is also built-in. The SI-8000T/F operates at 300kHz, the SI-8000H at 150kHz, the SI-8000J at 125kHz and the SI-8000S at 60kHz. Pricing ranges from 66 cents to $1.37 in quantities of 1,000. Delivery is 12 weeks typical lead time.

- Gina Roos

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