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I am using a TPS62903RPJR as a power input chip on one of my designs.
When I power it with 4 x AA batteries it's fine.
When I power it with a 6V AGM battery it is usually fine, but sometimes the TPS62903RPJR is damaged.
When I power it with a 12V AGM or 12V LFP battery the TPS62903RPJR almost always burns.
It doesn't just short and spark, part of the case flames out.
I have tried changing the soft start delay time, changing the mode resistor, adding an 18V Zener diode across the input and none of these have worked.
The only thing that has worked so far is adding a current limiting resistor in line with the positive terminal of the battery. This is not a good solution as we will burn power with this.
Can this chip not be used with batteries?
Hi Colin,
The full schematic and layout are proprietary. I can share a snippet of just the chip and the passive components around it.
The live chat customer service person said I may be able to send a TI person the full schematic privately once I had posted in this forum.
