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I am using the MIC29300 https://www.microchip.com/wwwproducts/en/MIC29300 in my circuit to generate a 5V signal to my ADC (works fine now)

Would it be possible to grab that 5V line and have it provide the power for my Raspberry Pi 3 Model B+? Would it cause voltage fluctuations and affect my ADC? Should I just use another IC?

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  • Ah, I feel jealous that you are using MIC 2930x LDO, which is 10 times more expensive than the cheapie LM2596 I have been using all these years. I know MIC2930x is industrial grade, with the following non LM2596 features: (a) Low dropout voltage, (b) Low ground current, (c) Accurate 1% guaranteed tolerance, (d) Extremely fast transient response, (e) Reverse-battery and load dump protection, (f) Zero-current shutdown mode, (g) Error flag signals output out-of-regulation. – tlfong01 40 mins ago    
  • References:MIC2930x 5-Lead TO-220 Fixed Voltage High-Current Low Dropout Regulators ww1.microchip.com/downloads/en/DeviceDoc/… – tlfong01 39 mins ago   


You COULD use a linear regulator if you have a large enough heatsink because any linear regulator will dissipate lots of heat.

Whether the voltage would be stable and sufficiently clean depends on the circuitry you put around the regulator.

I wouldn’t use a linear regulator switch mode power supplies are preferable.

PS I don’t know why you would want to use a separate regulator with an ADC – most have precision internal references, which are temperature stabilised.

  • The ADC I am using is the MAX1204 and requires a 5V power supply. I believe the internals reference is set at 4.096 V (which works great) but I still need to power the device with a 5V line. – George 4 hours ago
  • What is wrong with the 5V pin on the Pi – that is what the rest of us would use. – Milliways 4 hours ago
  • I could give it a shot. I was under the impression that the raspberry pi has a noisy environment which is why I didn’t want to try and use it’s power supplies. The ADC has an internal reference, but I was also under the impression that it depends on how clean the VDD signal is. Garbage in = Garbage out. And I just wanted to show you. Some people like to have the links. – George 4 hours ago
  • Sorry, I will be more careful next time. – George 3 hours ago

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