Sunnyvale, Calif. - Advanced Analogic Technologies' AAT4280A family of p-channel MOSFET devices features flexible turn-on and turn-off characteristics—from very fast to slew-rate limited—for high-side load-switching in portable device applications. "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," said Kin Shum, director of Strategic Marketing. "By integrating slew-rate control, support for 1.5-volt 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 AAT4280A, combining the MOSFET with logic-level input and level-shifting features, comes in three versions. The AAT4280-1 has a moderate slew-rate limited (1 ms typical, for turn-on) load switch with low RDS(on) characteristics. RDS(on) is 80 milliohms typical (at Vgs = 5).
The second version, the AAT4280A-2, is a basic high-speed switch (no slew rate control or special output discharge features) with a typical turn-on of 500 ns. The AAT4280A-3 has a slew-rate of 100 microseconds typical as well as an output discharge shutdown circuit to rapidly turn off a load when the switch is disabled.
All three versions support operation over a 1.5- to 5.5- volt input range. Quiescent current is only 25 nA. Input logic levels are TTL and CMOS compatible. The AAT4280A, in an 8-pin SC70JW package and rated for operation over the -40 to +85°C temperature range, is priced at 49 cents each in 1k quantities.