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TPS60402: High Failure rate

Part Number: TPS60402
Other Parts Discussed in Thread: OPA4197,

I've been using the TPS60402DBVR in several designs to obviously produce a negative rail.  They have all worked flawlessly until now.  I'm seeing a high failure rate with the input, ground and output all being shorted in some combination (either input to ground, output to ground, or in some cases all three shorted together).  

A new product I've been working on takes +24V in and drops it to +5V.  The +5V is then inverted with the TPS60402 to -5V.  The +/-5V is then used to power a quad op-amp (OPA4197).

The regulator has a 10uF input cap and 22uF output cap.  The TPS60402 has a 1uF input cap, 3.3uF flying cap, and 3.3uF output cap.  The -5V rail goes through a 10-ohm resistor, then a 10nF cap before the op-amp.

I've lost almost 20 of these charge pumps in this way and I'm unable to figure out why.