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LMR33630-Q1: Schematic review

Denny Huang
Expert 7170 points
Part Number: LMR33630-Q1

Dear team

There is a good news that we design in LMR33630-Q1 in customer's new project.

Could you help to review the schematic(U28 and U26)?

spec of U28 : Vin =9V~16V, Vo=5V, Io=2A

spec of U28 : Vin =5V, Vo=3.3V, Io=2A

Many thanks

Denny

  • 0
    TI__Expert 8130 points

    Hello Denny,

    Both Schematics look good. I believe customer followed Table 8-2 in the datasheet (which is good). In regards to 3v3 output schematic, L5 is 1.5uH, which should be okay. Table 8-2 does recommend a higher value of 2.2uH, so perhaps customer made a typo (if they were following table 8-2). Regardless, 1.5uH should be okay. Just wanted to point that out.

    Kind regards,
    Alejandro

  • 0
    TI__Mastermind 27295 points

    Hi Denny,

    For U28 section:

    1. Input cap 35V--50V rating, output cap 16V rating

    2. Add 0ohm in series C211

    3. Reduce R446+R133 to 10K~22K range

    4. C368 is DNP

    For U26 section:

    1. Input cap >16V rating, output cap 10V rating

    2. Add 0ohm in series C223

    B R

    Andy