Level shifter 1.8 -> >= 3V

Thread Starter

nicolasp5186

Joined Dec 30, 2017
5
Hi,

I am making a power supply with DCDC converter.
The DCDC converter has an enable pin "EN" which need at least 2.4V (threshold) to turn on.
My controller is 1.8V.
How can i adapt these two voltage ?
And i would like that when there is no microcontroller connected, the EN pin is tied low (DCDC OFF).

Regards
 

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Thread Starter

nicolasp5186

Joined Dec 30, 2017
5
hi,
This is one option, [ not very elegant!] if the 2k2, R4 to 0v on the Enb will switch the DC2DC Off.
Select R5 to suit the 3.3V zener current, Vsup is 12V or 5V.

E
Thank you for your schematic proposal !
For information, the EN pin voltage support from 2.4V to 12V. Do you think there will be a simple solution with mosfet transistors ?

BR
 
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