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LM5143-Q1: VIN pin connection for external VCCX regulator

Part Number: LM5143-Q1


Hey team,

I am using a dual phase configuration to regulate 48V down to 24V with LM5143-Q1.  I'd like to use an external 5V buck regulator connected to VCCX to reduce power consumption.  For this configuration, what is the proper connection for VIN?

a. Connect to 48V

b. Connect to 5V

c. Leave unconnected

Thanks