CM3103

CM3103 400mA SmartORTM Regulator with VAUX Switch Features Continuous 3.3V / 400mA output from two inputs Complete Power Management solution Built-in hysteresis when selecting input supplies Integrated switch featuring low RDSON (0.25Ω typ.) Foldback current limiting protection www.DataSheet4U.com Thermal overload shutdown protection 8-pin SOIC package Lead-free version available Product Description The CM3103 combines a fixed voltage regulator and a VAUX switch in a single 8-pin SOIC package. The voltage regulator is capable of delivering up to 400mA 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...