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Is there a single IC that generates 5V, 3.3V and 1.8V power rails after conversion

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Advanced Member level 2
Apr 17, 2011
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Though it is possible to use separate voltage regulators for each rail, is it possible to use a single IC that will take either AC supply or a DC supply as input and generated 5V, 3.3V and 1.8V outputs that can then be used to power various digital circuit components on a PCB? Does such a component exist?

I have seen numerous multi-buck+LDO power management
chip ads / blurbs go by, over the last few years. Any of the
big players will have something for this. Of course you're
talking single IC and a plurality of inductors, caps and so on.

hmm, so that means it will be a monolithic device but need external discrete components to function properly?

OK, so what I need can be found under power managment ICs. OK. I found this on wikipedia

This page states: Intel, Qualcomm, MediaTek, Freescale Semiconductor, Dialog Semiconductor, Exar, International Rectifier, Intersil, Maxim Integrated Products, Linear Technology, Renesas Electronics, Rohm Semiconductor,ON Semiconductor, and Texas Instruments are some of many manufacturers of Power management integrated circuits (power management ICs or PMICs).

By the way, if you could provide me reference to just 1 such chip, it will simplify my search process. When I look at websites like RS, there is a flood of power managment ICs. It is not clear how I can find an IC capable of such coversion as a single component
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is it possible to use a single IC that will take either AC supply or a DC supply as input and generated 5V, 3.3V and 1.8V outputs ..........

You are looking at DCM flyback controller, which in itself is a single chip.
Of course, like all flybacks, it requires an external coupled inductor (transformer) with multiple taps to provide the required voltages.
Unfortunately, there will be cross regulation issues as load varies among the different taps, so most likely the most sensitive output (1.8v) will require an LDO.
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