Why does the LTC2485 datasheet say to use a tantalum Vcc bypass capacitor?

Hello adamvs ,

Tantalums are preferred because the internal LDO needs to have a high-ESR capacitor to ensure stability across operating conditions. Well, this is not strictly tantalum, you can add in place a ceramic capacitor with a series resistor of maybe 5-10 ohms. But then, that would be an extra component added to the BOM.

Regards,

Yugel

Hi, On evaluation board you have ceramic 1u F capacitor. Can you check again if tantal is really mandatory?

Hi Aless ,

You may use the evaluation board schematic and BOM as a guide in designing your own board. While the tantalum capacitor is preferred for the reason Yugel mentioned, it is not mandatory.

Hope this helps.

Regards,

JC