Hi,
I'm using the TPS61030 to boost a lipo battery up to 5v. So far, I've made four test boards.
Board 1: this one works fine.
Board 2: this board always returns the input voltage minus 0.4v I posted this earlier and was suggested that it could be a bad device. I decided to make two more to test.
Board 3 and 4: These boards failed on first power up. This time, the failure was an internal short in the IC between SW (pin 1 and 2) and GND (pins 3, 4, and 5). No short between SW and PowerPad. After determining this, I replaced both with fresh ICs and they seem to be functioning as expected. I thought, maybe damage during reflow (though temperature was within datasheet spec).
However after a short while in the field, board 1 (which was working) failed in the same way boards 3 and 4 initially did: an internal short between SW and GND.
So currently I only have 2 out of 4 devices working. I had planned to make more, but am now a bit uncertain.
Further searching yields these two posts which show the same issue, but without a real solution:
http://e2e.ti.com/support/power-management/f/196/t/210090
http://e2e.ti.com/support/power-management/f/196/p/678739/2505615
My layout has posted and edited slightly with suggestions from this forum, but still curious as to what the issue could be and welcome any suggestions on how to prevent it.
Original post if helpful: https://e2e.ti.com/support/power-management/f/196/t/730044
I've attached my updated layout and schematic.
Tim