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Original question:

LP8863-Q1: Accuracy for PWM_FSET resistor

LP8866S-Q1: Boost switching frequency selection

Alan O
Mastermind 32575 points
Part Number: LP8866S-Q1
Other Parts Discussed in Thread: LP8866-Q1

I have a question on boost switching frequency selections on LP8866S-Q1. Below shows the Fsw options listed on the data sheet.  I want to know if these 8 frequencies are the only options, or if it's possible to achieve another frequency in-between using a different BST_FSET resistor value.  For example, could we configure 600kHz if we use a resistor value between 11kohm and 17.8kohm?  Thanks in advance.

  • +1
    TI__Genius 17660 points

    Alan, 

    No, these 8 frequencies are the only options. Resistor with 1% accuracy is needed to ensure proper operation. LP8866-Q1 defaults the switching frequency of boost to 400 kHz if BOOST_FSET resistor is missing or invalid. 

    Regards, 

    XG