Linear Voltage Regulator for Teensy 4.0 Breakout Board

ZackM

Member
Hi all,

I'm making a breakout board for my Teensy 4.0 that will have power supplied to it from an external power supply. I need to add a voltage regulator to get the voltage into the Teensy down to 5V, but I can't figure out what the minimum mA output of the voltage regulator needs to be. Does anyone happen to know what it needs to be?
 
Use a 7805. It can load 1A with cooling. When running at 600 MHz, Teensy 4.0 consumes approximately 100 mA current.

Best regards. Rolf
 
What is your incoming supply voltage? The 7805 will work for a range, starting at 7V (2V dropout requirement). The top end will be 25V max, but also limited by heat, generated by the power dissipation from the voltage drop, figure P= 0.1A x (Vin -5V) and try to keep that well under 1/2 watt without a heat sink.
 
Supply voltage is 12V. So I'd be at .7 watts, yeah? I guess I'll take a look at some heat sinks then.
 
You can also use a switched power regulator. This is compatible with the 7805 and does not need a heat sink, e.g. Recom R-78E5.0-0.5
 
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