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How to switch feedback networsk in synchronous Step-Down Voltage Regulator?

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berger.h

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I have synchronous Step-Down Voltage Regulator drives by LM76003
500kHz FB have reference voltage 1V.
This power supply has power two Independent Load and I wonder how to switch feedback network pro FB input LM76003
if first load not used FB1 have high impedance.
The question is how switch On/Off FB2?

Small signal relay, OK but relative lagre solution
Analog switch, maybe, but what? In device is not negative voltage for power analog switch.

LM76003EVM-500K%20-%20Schematic.png
 

You don't need a negative voltage for an analog switch, such as a CD4066, unless you are switching a negative voltage.
 

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