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TPS629210-Q1: Minimum input voltage for IBB

Part Number: TPS629210-Q1
Other Parts Discussed in Thread: TPS62903

Tool/software:


Hi support team,
This is a question about Inverting Buck - Boost.

Isn't the minimum input voltage for IBB just "3V" and not "3V + VOUT"?

www.ti.com/.../slvafc5.pdf

The minimum input voltage for TPS62903 is "3V" for the following reasons.
"The minimum input voltage stays the same at 3V because the device will not turn on during startup when the negative VOUT is not present."

www.ti.com/.../slvafb4.pdf

Regards,
Dice-K