# Are there constant voltage regulators regulating up and down for variable input?

So let's say I have a circuit that requires 2 Volts DC exactly as the source, but my power supply can be from 1 Volt to 12 Volts DC.

It would be easy to step down the voltage with a linear voltage regulator if the supply voltage was higher than what is needed for the circuit.

However, I can't seem to find any ICs that do both. It seems like no voltage regulators step up the voltage while stepping down the current into the circuit... So I'm wondering if this is even possible.

The load is a huge capacitor that will draw as much current as possible due to low series resistance! I don't care the rate at which the capacitor charges, as long as the volts don't exceed the maximum rating. 1.5 Volts will be minimum, 12 will be maximum. The capacitor is rated for 2.7 Volts, so storing energy at 2V seems pretty good to me. But in the source is 1.5 Volts, that's a lot of energy that is unable to be stored, so I figured id step it up to 2V somehow.

• You need a switching converter. Search for non-inverting buck-boost. Not sure what you mean by "It seems like no voltage regulators step up the voltage while stepping down the current into the circuit" Power out = power in - losses. Commented Feb 3, 2017 at 18:11
• Also, the max current that the regulated source puts out will be important if it's not large enough to meet the requirements of the load. Commented Feb 3, 2017 at 18:18
• I'm not sure what you mean by "the amps are allowed to vary greatly"? If the load needs more amps than the source can provide then the voltage will droop below the regulated set point. The load current needs to be clearly defined to regulate properly. Commented Feb 3, 2017 at 18:18
• The term you are looking for is "buck-boost converter". However, a 1 V minimum input could be a problem. Are those actual figures or just speculation? Commented Feb 3, 2017 at 18:18
• @AndrewMorton is absolutely correct, a 1V minimum input buck-boost will be difficult to find, though there are boost converters that can operate that low. You may need a hybrid approach.... Commented Feb 3, 2017 at 18:29