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LM76003EVM-500K: Current Limiting Lower than Expected

Part Number: LM76003EVM-500K
Other Parts Discussed in Thread: LM76003


I have a working design using the LM76003 and I'm seeing an issue in low volume production where some ICs will current limit much lower than expected, somewhere between 1 and 2 amps depending on the specimen. We've also noticed that the current limit will sometimes change on power cycle or toggling of the enable pin (in one instance going from ~1.2A to 2.3A.) The voltage waveform at the inductor looks fine even through the current limit (the duty cycle just reduces); and we've attempted to verify that all the passives around the IC are correct.

Boards that work will current limit somewhere upwards of 3.75A (the highest point my acceptance test procedure tests at.)

Does TI have any suggestions for things to look at when attempting to isolate why some of the boards exhibit the lower current limit?