Allegro’s Switching Regulators Operate on Higher Frequencies

 Allegro MicroSystems introduced a new family of switching regulators with high operating frequencies and external components. This ...
August 9, 2007— Allegro MicroSystems introduced a new family of switching regulators with high operating frequencies and external components. This new series of devices addresses a market need for increased energy saving electric and electronic equipment targeted toward the portable and office automation markets.

The SI-8000T (1.5 A) and SI-8000F (3.5 A) series have reduced die sizes, between 62% and 84% of the previous generation of devices for the same current levels, the SI-8000J/S series respectively. Also, the SI-8000H(5.5 A) series breaks new ground, offering a significant line-up that exceeds 5 A.

By connecting an open collector transistor, the user is able to set an on/off control for output voltage. Moreover, 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 UVLO (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 reduction of die size improves IC response speed making higher oscillation frequencies attainable. The SI-8000T/F operates at 300 kHz, the SI-8000H at 150 kHz, the SI-8000J at 125 kHz, and the SI-8000S at 60 kHz.

Allegro Microsystems
Email: 
sfennelly@allegromicro.com
URL: 
www.allegromicro.com