LSF0101: What is the A1/B1 pin status?

Jason Dai

Expert 3720 points

Part Number: LSF0101

Hello E2E,

What is the A1/B1 pin status while VREFA voltage drop to zero but VREFB and EN power is still given?

Any risk to damage IC at that abnormal condition?

~Jason

over 3 years ago

0 Clemens Ladisch over 3 years ago

Guru 242800 points

During normal operation, a small current flows through R238, into Vref_B, and out of Vref_A. That current will continue to flow. This is not a problem for the LSF itself, but other devices connected to VDD_1P8 might be powered up partially.

To disable the device, EN must be pulled low. See the Using the Enable Pin with the LSF Family video.

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LSF0101: What is the A1/B1 pin status?