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TIDA-01471: Multiplexers and current source based on TLV431BQ

Part Number: TIDA-01471
Other Parts Discussed in Thread: MUX36S08, TMUX6104

Dear Ahmed,

I have two questions related to this reference design.

1. In this forum thread, you mentioned the preferred multiplexer for the current source: MUX36xxx or MUX61xxx (TMUX6104). Despite the fact that the TMUX6104 is a 36-volt multiplexer, with single supply, the maximum supply voltage (and analog inputs) is 16.5 V. This is less than the voltage of the current source (20-24 V). How can we use TMUX6104 in this case? I think the MUX36S08 is more suitable. Isn't it?

2. The second question about current source based on TLV431BQ. TLV431BQ comes in five different packages. Each of the packages has its own ability to dissipate heat. I did not find calculations on how to calculate the amount of heat dissipated by this chip in this application. Do I have to use the smallest TLV431BQ package or are there any specific requirements?

Best wishes,