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MT3608 Step Up problems with Sim900A module

Luigi

Oct 18, 2016
1
Joined
Oct 18, 2016
Messages
1
Hi,
I can't believe, some mouths ago i tested my system with atmega328 and Sim900A with a MT3608 Step Up.
I got 3.7 to 5v and all went right with different battery.
Today i've been tested the same system but i find that the MT3608 can't supply the right current(I think) to the Sim900a that go down on start.
I tried that with different battery with the same result.



I know that:

1) Sim900A need to 2A peak to start
2) If i use a usb power supply 1.5A system start without problem and the sim9000A starts.

Sorry for my english ... too much beer and i need to sleep.

Thank's
 
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