Product Description
The CMPWR150 is a low dropout regulator that delivers up to 500 mA of load current at a fixed 3.3 V output. An internal threshold level (typically 4.1 V) is used to prevent the regulator from being operated below dropout voltage. The device continuously monitors the input supply and will automatically disable the regulator when VCC falls below the threshold level. When the regulator is disabled, the control signal “Drive” (Active Low) is enabled, which allows an external PMOS switch to power the load from an auxiliary 3.3 V supply.

FEATUREs
• Automatic Detection of VCC Input Supply
• Drive Output Logic to Control External Switch
• Glitch−Free Output During Supply Transitions
• 500 mA Output Maximum Load Current
• Built−In Hysteresis During Supply Selection
• Controller Operates from Either VCC or VOUT
• 8−Pin Power SOIC Thermal Package
• These Devices are Pb−Free and are RoHS Compliant

APPLICATIONs
• PCI Adapter Cards
• Network Interface Cards (NICs)
• Dual Power Systems
• Systems with Standby Capabilities
• USB Powered Devices Such as Printers, Scanners, MP3 Players and Zip Drives
• See Application Note AP−211