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LTC4380 OUT Pin Bypass Cap

Page 8 of the LTC4380 datasheet advises that the OUT pin should be bypassed with a minimum of 22uF capacitor. Can anyone advise as to why such a large capacitance is required here as a bypass cap? Most example circuits in the datasheet show a 22uF with a designator of CLoad and the Eval kit places this capacitor not very close to the OUT pin.


  • The OUT bypass capacitor prevents OUT overshoot when the input voltage surges and also helps with current limit loop stability with inductive input or loads. 22uF is recommended to work for a wide variety of applications. Be sure to test these two issues if using a smaller capacitor.