Milpitas, Calif. - California Micro Devices' CM3103 chip is the latest member of the company's SmartOR power regulator family, serving as a solution for network interface cards that use two power sources (5-volt main supply, 3.3-V auxiliary supply). The device integrates a 5- to 3.3-V, 400-milliamp regulator with a 3.3-V Vaux switch, thus providing a constant 3.3-V output when dynamically switching between the two supplies.
The CM3103 provides instantly available PC (IAPC) functionality such as wake-on-LAN. It is aimed at the emerging gigabit network interface card and wireless local-area network markets, said Joe Salvador, director of marketing for computing products. The SmartOR regulators supply from 250 mA to 1.5 A.
Most advanced PC communications cards support IAPC, which allows a PC to be put into sleep mode and then woken up by an external event. Such an event could be triggered by an MIS administrator who remotely wakes a user's PC over the network to upgrade software and perform a system backup. Implementing IAPC or wake-on-LAN functionality requires regulator circuitry to turn off the main 5-V power rail to conserve power in the sleep mode.
To keep the networking card active when the main PC power rail goes down, the card must draw power from an alternate source-generally, a 3.3-V auxiliary rail or a 5-V standby rail. The CM3103 provides a glitch-free transition between the two when the PC is switching modes. Packaged in an eight-pin thermally enhanced SOIC, it is priced at 52 cents each in lots of 10,000.
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