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Load switches prevent current spikes, sags

Posted: 03 Feb 2005 ?? ?Print Version ?Bookmark and Share

Keywords:aat4280a? advanced analogic technologies? analogictech? load switch?

Advanced Analogic Technologies Inc. (AnalogicTech) unveiled a family of slew rate controlled integrated load switches that are designed to control internal loads by slowly ramping up output voltage at a desired rate, preventing current spikes and sags in input supply rails.

"As portable system processors and chipsets continue to push operating voltages lower with each new generation, they need load switches capable of supporting lower voltages," explained Kin Shum, Director of Strategic Marketing at AnalogicTech. "By integrating slew rate control, support for 1.5V input, and an extremely low quiescent current, the AAT4280A gives designers the control they need to drive down power consumption and build a more competitive portable product."

The press release further said that the new intelligent switches combine an extremely low resistance P-channel MOSFET with logic level input and level shifting features to eliminate multiple components on a PCB. RDS(ON) is 80 m? (5V) typical in a 2-by-2.2mm SC70JW-8 package.

The AAT4280A comes in three distinct versions: the AAT4280A-1 with a moderate turn-on slew rate to reduce in-rush current when the MOSFET is turned on; the AAT4280A-2 that serves as a high-speed switch with typical turn-on of 500ns and does not offer any turn-on slew rate control or special output discharge features; and the AAT4280A-3 that adds a minimized slew rate limited turn-on function and a shutdown output discharge circuit to rapidly turn off a load when the switch is disabled. All three versions support operation over a wide 1.5V to 5.5V input range, and feature a quiescent current of 25nA. Input logic levels are TTL and CMOS compatible.

The AAT4280A is available in an 8-pin SC70JW package and is specified over the -40C to 85C temperature range. It is available for 49 cents in 1,000-unit orders.

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