LM5143: How much current can vdda provide?

Hello Yan,

Do not suggest loading the VDDA other that recommendations shown in the datasheet.

The VDDA regulator has a 20ohm internal resistance and a UVLO circuit, don't suggest loading the VDDA with anything exceeding ~10mA.

if you need a low current bias supply, suggest using the VCC.

Hope this helps.

David.

Hello Yan,

The Ilimit of the respective supplies and capacitor will determine bring up time. 

Ilim = C(VDDA)*DV/DT. transpose for DT.  Hope this helps.

David.