This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

LM53602: The datasheet Figure 21. Efficiency

Part Number: LM53602
Other Parts Discussed in Thread: LM53603AEVM

Hi all

Would you mind if we ask LM53602?

On the datasheet Figure 21. Efficiency, it shows efficiency = 87% in case of Output current=10mA with Vin=18V, Vout=5V and Inductor = XAL6030-222ME.
We tried to realize it, however the result of simulation on Webench was approx 75%.
When we choice the incductor 6.8uH, we can get efficiency = 84%.

So, could you let us know constants of L, Cout, Cin and others which you simulated on the datasheet Figure 21. Efficiency?
We would like to know how to get over efficiency=87% with with Vin=18V, Vout=5V, Output current=10mA and Inductor = 2.2uH.
We appreciate your help always.

Kind regards,

Hirotaka Matsumoto

  • I will pass this to the apps engineer.

  • Hello Matsumoto-san,

    The figure 21 in datasheet is correct and is based on measurement data and not simulated results.

    The efficiency for Vin=18.0V, Vout=5.0V and Iload ~10mA has been confirmed to be just <90% (see attached spreadsheet).

    I used standard EVM (part number LM53603AEVM) set to ~5V output and could confirm results published in data sheet.

    If you need component values for L, Cout and Cin they are available in the EVM documentation.

    It should be also noted that Webench simulation results should be used as guideline and device performance should be always verified

     EVM or customer board.

    I hope this helps.

    Best regards


    Light load EFF_LM53603.xlsx