CM3103 Datasheet | California Micro Devices

Features Continuous 3.3V / 400m A output from two inputs plete Power Management solution Built-in hysteresis when selecting input supplies Integrated switch featuring low RDSON (0.25Ω typ.) - Foldback current limiting protection .. - Thermal overload shutdown protection - 8-pin SOIC package - Lead-free version available - - - - Product Description The CM3103 bines a fixed voltage regulator and a VAUX switch in a single 8-pin SOIC package. The voltage regulator is capable of delivering up to 400m A continuously at 3.3V. The output power is provided from two independent input voltage sources on a prioritized basis. Power is always taken in priority of VCC, then VAUX. When VCC (5V) is present, the device automatically enables the regulator, producing a stable 3.3V output at VOUT, while disabling the VAUX switch. When only VAUX (3.3V) is present, the device provides a low impedance direct connection (0.25Ω typ.) from VAUX to VOUT. All the necessary control circuitry needed to provide a smooth and automatic transition between both supplies has been incorporated. This allows the VCC input supply to be dynamically switched without loss of output voltage. The CM3103 is available with optional lead-free finishing. Applications - - - - PCI adapter cards with Wake-On-LAN Network Interface Cards (NICs) Multiple power supply systems Systems with standby capabilities Typical Application Circuit Simplified Electrical Schematic 5V + CIN VAUX 3.3V 1µF VOUT 3.3V/400m A + Enable VOUT Vdeselect VAUX GND 4.2V Aux Sw Controller 3.3V + + CEXT 10µF VAUX GND Aux Sw 0.25Ω - Regulator Amp VOUT © 2004 California Micro Devices Corp. All rights reserved. 01/28/04 430 N. Mc Carthy Blvd., Milpitas, CA 95035-5112 L Tel:...