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

Features
• Automatic selection of VCC or VSBY
• Drive control signal for external VAUX switch
• Continuous 3.3V output supply
• Glitch-free output during supply transitions
• Built-in hysteresis for supply selection
• VCC regulates up to 1.5A output current
• VSBY regulates up to 375mA output current
• Foldback current limiting
• Thermal shutdown with hysteresis
• On-chip controller operates from VCC, VSBY or VOUT

Applications
• Peripheral Component Interface (PCI) Adapter Cards
• Network Interface Cards (NIC’s)
• Multiple Powered Systems
• Systems with Standby Capabilities