The voltage converter design should follow recommendations from the datasheet about rileylink HOT 5 CLOSED

I've gone through several versions of the design that follow the datasheet layout and component selection more closely, and have still been having issues.

Check out the https://github.com/ps2/rileylink/tree/v1.0t branch, for the latest.

from rileylink.

Actually, the v1.0t is using a completely different regulator. Check out v0.8test2 for previous versions that use the same regulator but follow the datasheet very strictly.

from rileylink.

I'm surprised that still causes issues - what kind of issues if I might ask? Did you consider just using a 3.3V LDO?

from rileylink.

Same issues of overheating, drawing 200mA. Yes, looked at 3.3V ldo; wanted a more efficient design, so the new one is a buck.

from rileylink.

I just tried this. I have a Rileylink which pulls 300mA from the Lipo constantly. To test if the regulator is broken I directly connecting 3.3V after the regulator. This lead to a power draw of 0.02A and a working communication with the pump.

Next step I put in a LM1117-3.3V (bad choice but the only one I had around, drop-out of 1V, thus 3.1V at the CC1110). With a voltage of 5V applied at the input side my current draw is also only 0.02A. The efficiency seems to be similar and the Rileylink is working again.

I have to get a LDO with less drop-out voltage, otherwise I can only get around 20-30% capacity out of the battery. Luckily there is a bunch of alternatives and I just ordered an LP2992 which supposedly only has around 0.1V drop voltage.

(As background I can recommend reading

http://electronics.stackexchange.com/questions/38782/regulated-3-3v-from-a-lithium-ion-or-lipo-battery )

from rileylink.