AD8062's vout is dropping.

Question

Hi 
 I&rsquo;m using AD8062 by voltage follower. Then I have confirmed Vout drop from 3V to 2V. Could you confirm the following specification. V+ : 3.3V V- : GND +IN : 3V Rload : none

PaulCA · Accepted Answer

Hello, Can you send me your circuit schematic for me to check? Thanks. Regards, Paul)

PaulCA · Answer

Hello kshigemori281 , The input voltage range of AD8602 has a headroom of 1.8 V, meaning for it to work satisfactory, the input voltage should not exceed the Supply Voltage minus the headroom (Vs-headroom) 
 For example, for Vs = 5V, the input should not exceed +3.2 V 
 Max input voltage = Vs - headroom = 5V - 1.8V = 3.2V

In your schematic, using the above formula, the input voltage should not exceed 1.5 V for it to work satisfactory. 
 Max input voltage = Vs - headroom = 3.3V - 1.8V = 1.5V 
 
 As a recommendation, you can increase your supply voltage to 5V so the part can accept the 3V input and work as it intended to be.

PaulCA · Answer

Hello, Glad that I can help! 
 Regards, Paul

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AD8062's vout is dropping.