Hello,
I'm using LM2596 for the power supply of SIM800 GSM module.
LM2596 is stepping down voltage to 3.8V. I have attached schematic diagram of it.
It is working good if I use 12V-5A SMPS as power source. But when I use other supply like 24V-2A, LM2596 burns out while SIM800 is registering on network(during this time SIM800 draws more current). I'm not getting why it is burning out.
When you multiply the Input Voltage, you multiply also the Power Dissipation on the IC, that's why it fails.( constant current is drawn by the circuit )
@BigBoss, it is not a linear (series pass) device, so your comment may be a little wide of the mark.
Without seeing the physical ckt it is hard to diagnose - the part is rated up to 40V in, if it is insufficiently heat-sunk then it may shut down due to over temp, as the switching losses go up with Vin...