Product Description
The ON Semiconductor’s SmartOR CMPWR280 is a fully protected Dual−Input low−dropout CMOS regulator that also provides the necessary control signal for driving an external auxiliary P−channel MOSFET switch. The SmartOR device automatically selects one of three possible inputs on a priority basis: VCC (1.5 A), VSBY (375 mA) or VAUX via the drive signal used to control an external switch.

FEATUREs
• Selects from 3 Input Voltages and Provides 3.3 V Output
• Automatic Selection of VCC, VSBY or VAUX
• Drive Control Signal for External VAUX Switch
• Glitch−Free 3.3 V Output During Supply Transitions
• Built−In Hysteresis for Supply Selection
• VCC Regulates Up to 1.5 A Output Current
• VSBY Regulates Up to 375 mA Output Current
• Foldback Current Limiting
• Thermal Shutdown with Hysteresis
• Standard 5−lead TO−263 Package
• These Devices are Pb−Free and are RoHS Compliant

APPLICATIONs
• Peripheral Component Interface (PCI) Adapter Cards
• Network Interface Cards (NICs)
• Multiple Powered Systems
• Systems with Standby Capabilities