I have used an mc34063a as a step-down from 12V to 5V. The circuit is straight out of the datasheet with no modifications at all. It's been working very well for me in various projects. I have a project now where the supply voltage is only 7.5V. Is this enough? Also, at the other end of the scale, what is the max voltage it will take? Data sheet says 40V max but refers to the chip I presume and not specifically this reference design. Load is max 100mA. Thanks!
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