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LDO FAQs Slide 7

What is the effect of Vout on output noise? Noise tends to increase with increasing VOUT as the error amplifies gains it up. How much input capacitance do I need? Should it be low ESR? If the output capacitor meets LDO requirements and the LDO still oscillates or drops too far during a transient, then increase the size of the input capacitor, and look at the ESR. If it is a higher ESR capacitor, then go to a lower ESR capacitor.

PTM Published on: 2011-05-16