CMPWR330 Datasheet, PDF (1/13 Pages) California Micro Devices Corp – 400mA SMARTOR Dual Regulator with V switch

400mA SmartOR^TM Regulator
with V_AUX Switch
CMPWR330
Features
• Continuous 3.3V output from three inputs
• Complete power management solution
• V_CC, V_SBY regulator supplies 400mA output
• Built-in hysteresis when selecting input supplies
• Integrated switch has very low R_DS(ON) resistance
of 0.25Ω (TYP)
• Foldback current limiting protection
• Thermal overload shutdown protection
• 8-pin power SOIC package
• RoHS compliant (lead-free) finishing
Applications
• PCI adapter cards with Wake-On-LAN
• Network Interface Cards (NICs)
• Multiple power systems
• Systems with standby capabilities
Product Description
The CMPWR330 is a dual input regulator with a fully
integrated VAUX switch capable of delivering up to
400mA continuously at 3.3V. The input is taken from
three independent voltage sources on a prioritized
basis. Power is always taken in priority using the
order of V_CC, V_SBY, and V_AUX.
When V_CC, (5V) or V_SBY is present, the device
automatically enables the regulator and produces a
stable 3.3V output at V_OUT.
When only V_AUX (3.3V) is present, the device provides
a low impedance direct connection (0.25Ω TYP.)
from V_AUX to V_OUT.
All the necessary control circuitry needed to provide a
smooth and automatic transition between all three
supplies has been incorporated. This allows the V_CC
input supply to be dynamically switched without loss
of output voltage.
The CMPWR330 is housed in an 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:
CMPWR330/D