On the product page for the ItsyBitsty 32u4 3V, it says "On-board 3.3V power regulator with 500mA output capability and ultra-low dropout. Up to 6V input, reverse-polarity protection, thermal and current-limit protection."
On the product page for the 5V version, it says "On-board 5.0V power regulator with 150mA output capability and ultra-low dropout. Up to 16V input, reverse-polarity protection, thermal and current-limit protection."
The schematics for both show a MIC5225, which matches the 16V and 150mA of the 5V.
Is the product page or schematic right on the 3V version? If the product page is right, what vreg does it actually use?
ItsyBitsy Voltage Regulator
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- hiduino
- Posts: 862
- Joined: Sat Sep 01, 2012 7:05 pm
Re: ItsyBitsy Voltage Regulator
The 3v itsy uses a different power regulator (input range 3.5 - 6 VDC) as stated in the learning guide.
https://learn.adafruit.com/introducting ... power-pins
https://learn.adafruit.com/introducting ... power-pins
Last edited by hiduino on Sat Jun 23, 2018 7:10 am, edited 1 time in total.
- Numien
- Posts: 3
- Joined: Fri Jun 22, 2018 10:11 pm
Re: ItsyBitsy Voltage Regulator
So they're probably both wrong, nice.
If someone could look up what part is actually used there, it'd be greatly appreciated. The lettering on the chip in the picture isn't too helpful, but on a SMT chip that tiny it's hard to be.
If someone could look up what part is actually used there, it'd be greatly appreciated. The lettering on the chip in the picture isn't too helpful, but on a SMT chip that tiny it's hard to be.
- hiduino
- Posts: 862
- Joined: Sat Sep 01, 2012 7:05 pm
Re: ItsyBitsy Voltage Regulator
No, I stand corrected. By the part number, G3P, it is a different chip. It does look like it will support 500 mA current at 3.3V.
See here the datasheet, https://cdn-shop.adafruit.com/product-f ... AP2112.pdf
So the product page and learning guide are correct. However the schematic does not reflect the correct part number for the 3.3 V regulator.
See here the datasheet, https://cdn-shop.adafruit.com/product-f ... AP2112.pdf
So the product page and learning guide are correct. However the schematic does not reflect the correct part number for the 3.3 V regulator.
Last edited by hiduino on Sat Jun 23, 2018 7:21 am, edited 1 time in total.
- hiduino
- Posts: 862
- Joined: Sat Sep 01, 2012 7:05 pm
Re: ItsyBitsy Voltage Regulator
For reference, the ItsyBitsy 5V version, voltage regulator chip part number is QT50, which does correspond to the MIC5225-5V part.
Datasheet, https://cdn-shop.adafruit.com/datasheets/mic5225.pdf
Datasheet, https://cdn-shop.adafruit.com/datasheets/mic5225.pdf
- Numien
- Posts: 3
- Joined: Fri Jun 22, 2018 10:11 pm
Re: ItsyBitsy Voltage Regulator
Okay, thanks for the information.
- adafruit2
- Posts: 22148
- Joined: Fri Mar 11, 2005 7:36 pm
Re: ItsyBitsy Voltage Regulator
the 5V version uses MIC5225-5.0 which is 16V max, 150mA max
the 3.3V version uses AP2112K-3.3 which is 6V max, 500mA max
the 3.3V version uses AP2112K-3.3 which is 6V max, 500mA max
Please be positive and constructive with your questions and comments.