Product Description
The California Micro Devices’ SmartORTM CMPWR101 is a low dropout regulator that delivers up to 250mA of load current at a fixed 3.3V output. An internal threshold level (typically 4.1V) 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, a low impedance, fully integrated switch is enabled which allows the output to be directly powered from an auxiliary 3.3V supply.

Features
• Automatic detection of VCC input supply
• Glitch-free output during supply transitions
• Built-in hysteresis during supply selection
• 250mA output maximum load current
• Fully integrated VAUX switch
• Overload current protection
• Short circuit current protection
• Operates from either VCC or VAUX
• 8-pin SOIC package

Applications
• PCI adapter cards
• Network Interface Cards (NIC’s)
• Dual power systems
• Systems with standby capabilities