TPS62097: Negative Spike at SW Node

Hao Jie Chan

Part Number: TPS62097

I observed some ringing at the SW node, which causes it to have negative spikes at every switching cycle. I measured close to -2V for about 5ns. In the datasheet the minimum voltage specified is -0.3V for SW pin. Is this spike acceptable?

over 4 years ago

0 Stefano Panaro over 4 years ago

TI__Expert 7695 points

Hi Hao,

Thank you for your question.

What are VIN and VOUT for your application? What is the load when the described condition happens?

Can you please provide VIN, VOUT and SW waveforms in the described condition?

Thanks,

Stefano

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0 Hao Jie Chan over 4 years ago in reply to Stefano Panaro

Intellectual 270 points

Vin 3.3V, Vout 1.2V, loaded at 1.5A

I don't have the Vin Vout and SW in the same screenshot though. I'll paste SW for now, if you really need the Vin and Vout I'll capture and them later, is that okay?