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LMR36015: Configuration of input capacitor

Kaji@PAN
Mastermind 7015 points
Part Number: LMR36015

Hi,

I am designing using the LMR36015 device.
The layout is designed, but because the board area is small, the input capacitor uses one CHF (0.1uF) and one CIN (10uF).
The layout at that time is shown below.
The board I design has four layers. The second and third layers are ground.
CHF should be placed near 10pin. No CHF is placed on 2pin and only the wiring is connected to VIN on the 4-layer side.
Is there any problem when doing the above layout?
Best regards,
  • 0
    TI__Mastermind 27045 points

    Hi Kaji,

    It's OK to use one bulk CIN on either VIN pin, but the two CHF capacitors should have top priority to be placed close to the two VIN pin,  this help to improve EMI performance.

    Pls refer to EVM layout design that place the trace between Pin2 and Pin10  on 3rd layer with big copper area. use thin trace may cause current unbalance on two VIN pin.

    B R

    Andy