About LTM4646 Power Dissipation

Question

Hi I am using LTM4646.

In Figure 11 of the datasheet, is the power loss value single output?
Or is it the sum of the dual outputs?

I am using it below.
1. Input +12V
2. Output +4.15V
3.Composite output by connecting output 1 and output 2

About 0.43A of +12V flows when the output is unloaded.
The loss is about 5.16W.
The output is normal at 4.15V.
My device gets hot. Is it normal?

If it is normal, it would be helpful if you could tell me if there is a way to reduce power consumption.

Best regards.

FormerMember · Accepted Answer

Hello, 
 I'm assuming it is sum as it is either a dual 10A output or single 20A output load which is the output current in the figure is up to 20A. 
 You can try your design in LTPowerCAD to have an idea how it will behave. 
 
 When you say hot, what is the temp? 
 
 You can try increasing your switching frequency and see if it reduces power consumption. Make sure your EXTVCC is at 5V as it is an LDO. If the EXTVCC is high, it will consume a lot of wasted power.)

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