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LM53625-Q1: About boot strap resistor and EMI Question

Part Number: LM53625-Q1

Dear Sir/Ms.

LM53625 CBOOT Pin is recommended to add a 3 ohm resistor solution to EMI ( in datasheet Layout guide 3.) .
The customer is asking how much can be increased? Are there any other risks after the increase? We have tried 3 ohms 10 ohms 15 ohms.
The customer hopes to help analyze the three resistances of 3 ohms, 10 ohms and 15 ohms.
The current customer’s CE-C is shown below.

Best Regards,

Kami Huang

  • Hi Kami,

    How about PCB layout? did customer use inductor with shield core?

    Rboot will increase IC power loss, especially at 2MHz switching freq.

    Rboot should not bigger than 20 ohm, customer need to check device temp in worst case of Max Vin, load current and Ta condition, the Rboot can be increased as long as Tj below 150C.

    B R

    Andy