CM3103

• 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
• Thermal overload shutdown protection
• 8-pin SOIC package
• Lead-free version available

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) CM3103 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) CM3103 is present, the device provides a low impedance direct connection (0.25 typ.) from VAUX to VOUT.

All the necessary control circuitry CM3103 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.

Note: Some of the devices listed here have suggested replacements available. Please see additional information at the end of this page.