CMPWR101 Datasheet, PDF (1/12 Pages) California Micro Devices Corp – 250mA SMARTOR Regulator with V switch

250mA SmartOR^TM Regulator
with V_AUX Switch
CMPWR101
Features
• Automatic detection of V_CC input supply
• Glitch-free output during supply transitions
• Built-in hysteresis during supply selection
• 250mA output maximum load current
• Fully integrated V_AUX switch
• Overload current protection
• Short circuit current protection
• ^{Operates from either V}CC ^{or V}AUX
• 8-pin SOIC package
• RoHS compliant (lead-free) finishing
Applications
• PCI adapter cards
• Network Interface Cards (NICs)
• Dual power systems
• Systems with standby capabilities
Product Description
The California Micro Devices’ SmartOR^TM 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 V_CC 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.
When V_CC is restored to a level above the select threshold, the low impedance switch is disabled and the
regulator is once again enabled.
All the necessary control circuitry needed to provide a smooth and automatic transition between the
supplies has been incorporated. This allows V_CC to be dynamically switched without loss of output voltage.
An output logic signal, DRIVE, is active LOW whenever the internal regulator is disabled.
The CMPWR101 is housed in a 8-pin SOIC package and is available with RoHS compliant lead-free
finishing.
©2010 SCILLC. All rights reserved.
June 2010 Rev. 3
Publication Order Number:
CMPWR101/D