LMG3425R050: VNEG cap connection is contradicted in the datasheet

Bryan Sharp

Part Number: LMG3425R050

Table 6-1 describes VNEG as "Negative supply output, bypass to ground with 2.2-µF capacitor". Figure 10-1 shows the VNEG capacitor connected to source not ground. Which is correct?

over 2 years ago

0 Bryan Sharp over 2 years ago

Prodigy 110 points

Also Figure 12-2 shows the VNEG cap connected to source. I'm leaning towards this being correct, but I would like clarification.

+1 John Gomez over 2 years ago

TI__Intellectual 2255 points

Hi Bryan, thanks for your question. We apologize for the confusion - the GND pins on the LMG3425 are internally connected to the the source. This is why the VNEG bypass capacitor on the high-side device is referenced to the SW node. We are looking at updating our data sheet to reflect these changes that were made in the second generation devices.

Best regards,

John

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LMG3425R050: VNEG cap connection is contradicted in the datasheet