2
\$\begingroup\$

I've designed a board, that includes a charging part :

enter image description here

the problem that I have is in the LMS8117A-3.3: enter image description here

here I can measure 5V on Pin1, but nothing on pin2, I was expecting 3.3V : I've check the board and no I don't have any bypass, to test the board, I've put a 3.3V voltage at "target voltage pin" and the board works fine! So my question is how may solve this and what am I missing! This the layout part!

enter image description here

and here a link to the datasheet

\$\endgroup\$
3
  • 1
    \$\begingroup\$ You appear to have the input and output pins on the LMS8117 swapped. Unless the part as shown is on the bottom of the board. \$\endgroup\$
    – JRE
    Dec 4, 2016 at 9:56
  • \$\begingroup\$ Yes, you have possibly connected the 5 V to the GND pin and GND to the input pin. \$\endgroup\$ Dec 4, 2016 at 10:00
  • \$\begingroup\$ @JRE I suppose you should post it as an answer then. \$\endgroup\$ Dec 4, 2016 at 15:40

1 Answer 1

1
\$\begingroup\$

You appear to have swapped the ground and input pins.

enter image description here

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge that you have read and understand our privacy policy and code of conduct.

Not the answer you're looking for? Browse other questions tagged or ask your own question.