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SLA Status	Assignee	Support Status
SLA Closed. Missed after 149 hours		Awaiting Customer Response

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LT8722 Recommended for New Designs
The LT8722 is a high performance, high efficiency, monolithic full bridge DC/DC converter. One side of the full bridge is driven by a pulse width modulation...
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LT8722 on Analog.com

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LT8722

sp7 on Dec 23, 2025

Thread Summary

The user inquires about the risk of latch-up when VDDIO is kept at 3.3V while Vin (12V) is not always present. The final answer confirms that VDDIO can be applied without Vin, as the abs max rating for VDDIO is relative to GND. Testing on the DC3145A Evaluation Board is recommended to verify the application.
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Category: Hardware

Good Morinig/Afternoon

thank you for your support until now.

I always keep VDDIO at 3.3V.

The Vin (12V) is not always present (power switch before LT8722 could interrupt this).

There is risk of latch-up?

Best regards

karmijo327

on Dec 29, 2025 10:57 AM
0
Hi,

VDDIO can be applied when Vin is not applied. The abs max table says that the VDDIO pin abs max is related to GND, not to the Vin pin. To verify that your application would work with VDDIO first applied before Vin, we recommend you test it out on the demo board, which can be found here: DC3145A Evaluation Board | Analog Devices.

Thanks!
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karmijo327

on Jan 5, 2026 9:22 AM
+1
Closing this ticket.
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LT8722

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