General Description
The AAT4290 and AAT4291 SmartSwitch products are members of AnalogicTech’s Application Specific Power MOSFET™ (ASPM™) product family. The AAT4290 and AAT4291 are five and three P-channel MOSFETs, respectively, configured for use as a microprocessor I/O expander. Having independent drain outputs and a common source input, they operate with an input voltage ranging from 1.8V to 5.5V, making them ideal for 2.5V, 3.3V, or 5V systems, as well as systems powered by lithium-ion/polymer batteries.

Features
• 1.8V to 5.5V Input Voltage Range
• 5 or 3 Independent Load Switches
• S2Cwire Interface
• 1.1Ω RDS(ON) Per Switch
• Low Quiescent Current
    — 5µA
    — 0.1µA in Shutdown
• -40°C to +85°C Temperature Range
• 8-Pin SC70JW Package

Applications
• Cell Phones
• I/O Expansion
• Multiple Low Power Switching
• Personal Communication Devices
• Portable Electronic Devices