AnsweredAssumed Answered

ADP2301 outputs 2.5V instead of 5V

Question asked by MathiasVandel on May 15, 2017
Latest reply on May 22, 2017 by Migs



I am trying to make a DCDC converter using the ADP2301. The design is more or less taken from the design tool ADP230x_BuckDesigner_Release.xlsm. 


Down below is a picture of my circuit: 

DCDC circuit


I was hoping to get 5V as output, but instead i am seeing 2-2.5V with a lot of ripple. (see picture below) 



Here is some more scope pictures for you to understand what is going on. 


At BST pin: 



Enable pin:



Feedback pin: 



And here is the PCB layout. Underneath is a solid GND plane. 

PCB layout



Can anybody help me out here? I am a bit confused about the feedback pin. From the datasheet the regulation voltage is 0.8V which it is designed to be at 5V. Why am i seeing almost 2V when my output is 2.5V? 

I have no load at the output, does that have an impact?