Hi,
I am trying out the Micrel MIC5205 LDO I bought from ebay (item #311513963103) and they keep blowing up.
No magic smoke though.
After the failure there is always a short between Vcc and Ground.
The load is very small at around 14mA and this can handle up to 150mA.
Enable pin is always pulled down with a 100k resistor and I enable it by connecting the EN pin to Vcc.
A 1uF tantalum capacitor is connected to Vout.
http://ww1.microchip.com/downloads/en/DeviceDoc/mic5205.pdfAt first power on +8Vcc, the output was ramping up at a random manner. After some tries switching
the power supply on and off, it went to 3.3V and then it stayed there with a very stable output.
I applied a small load and everything was fine but whenever I tried +10V Vcc the output dropped to
almost zero. At 9.8V it started to draw excessive current. According to the datasheet this will work up to 16V.
The second IC had the same behavior but it was damaged immediately at 10V.
At first I thought that I damaged it thermally when soldering, because I used 300 degrees C.
The datasheet suggests a 250 degrees for 5 seconds as an absolute maximum.
The second time I used 230 degrees and very quickly. Same results though...
Am I doing something wrong, or did I receive a faulty batch ?
Any help is appreciated. (I have another 3 left...)
Thank you.
p.s. by the way, this fine pitch is simply evil !