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LP5912: LP5912-1.8DRVR if output cap change to 200uF, will it be stable

Poh Kok Keng
Genius 5512 points
Part Number: LP5912

hi Expert,

Understand Webench does not support LP5912-1.8DRVR yet, so I cannot simulate the stable condition.  

Can you tell me if I am using LP5912-1.8DRVR with 200uF output cap value, will it be stable ?

best regards,
kpk

  • 0
    TI__Mastermind 22610 points

    Can you describe the 200uF? Is this all Tantalum (with ESR), all ceramic, or some combination?

    Any particular reason for the need/want for 200uF Cout? This might be a subject we would want to add to the datasheet.

    I believe that LP5912-1.8 will be stable with Cout=200uF, but if I can have your Cout details I can easily confirm on the bench.

  • 0 in reply to Donald Jones
    Prodigy 20 points

    The LDO provides Supply to 10 LVDS Output Buffers that are being switched On/Off continuously at high rates. The edges of the outputs need to be aligned to within 10ps. A dip in supply is causing buffer to have different delays. High capacitance should be able to provide stable supply so that shorts bursts can be handled.

    For each of the 10 buffers we have a 0.1uF Ceramic and 47uF Ceramic. So total may add upto 470uF Ceramic Caps.

    CAP CER 47UF 6.3V X5R 0603, GRM188R60J476ME15D (Murata)