Tool/software:
Hi,
Is this efficiency curve for single channel and each phase can output 4A maximum current?
Besides, Customer use LP8758 to power 4 load with 3.3V input and 1.8V output, each load needs 1.4A current, the load can be parallel.
What is the efficiency way to power the load?
Thank you,
Yishan Chen
Hi Yishan,
Yes. This efficiency curve is showing the efficiency for a single channel. Yes, each phase can output current up to 4A.
I am not sure I understand your second question correctly.
You can also use PMIC Efficiency Estimator (PEET) to view a more specific efficiency curve for LP8758:
In the customer's case, the efficiency will be about 90.87%
Typical application circuit would look like this for powering 4 loads.
Best Regards,
Sarah Lao
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Just to double check, the total efficiency of this configuration will be (202.37+50.96)*4/(2773*4)=91.2%? or (2520*4)/(2773*4)=90.8%?
Hi Yishan , the configuration you show resembles more of a 4-phase configuration, where all four outputs are tied together. I went ahead and ran this through the Efficiency tester and it yielded a similar, but only slightly lower efficiency of 90.72%:
Efficiency is calculated per channel, as P_OUT / P_IN, so yes, it would be the second equation.
2520 / 2773 = 90.8%
Hope this helps!
Best Regards,
Sarah
