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Analog Circuit Design by Jim Williams, Bob Dobkin

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Section 1. Power Management Tutorials

Ceramic input capacitors can cause overvoltage transients (1)

When it comes to input filtering, ceramic capacitors are a great choice. They offer high ripple current rating and low ESR and ESL. Also, ceramic capacitors are not very sensitive to overvoltage and can be used without derating the operating voltage. However, designers must be aware of a potential overvoltage condition that is generated when input voltage is applied abruptly. After applying an input voltage step, typical input filter circuits with ceramic capacitors can generate voltage transients twice as high as the input voltage. This note describes how to efficiently use ceramic capacitors for input filters and how to avoid potential problems ...

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