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LMR23625: Schematic review

Kygo Cheng
Expert 6830 points
Part Number: LMR23625

Hi Team,

There is a good new that we DIN LMR23625

And there have one thing need your support!
Please help check this SCH & suggest L , THX

Vin = 12V~24V

Vo=5V / Io=3A

  • +1
    TI__Mastermind 19070 points

    Hello, 

    Please note this part is rated for 2.5A, but your message above says Io = 3A.

    Here are some comments:

    1. input capacitor - OK

    2. VCC capacitor - OK

    3. feedback resistors - double check the values for 5V output. If the bottom R is 20k, the top would have to increase to 80.6k for 5V output.

    4. boot resistor - make 0ohm as default and slowly increase if needed for EMI.

    5. inductor - inductor value seems OK. Check the current rating and make sure it is rated for the current limit current of the device. One of the inductors looks like semi-shielded or unshielded. It may be worse with EMI.

    6. output capacitance - check the value after bias derating (see manufacturer's datasheet) and ensure you have at least 33uF left. See table 2 in the datasheet. 

    7. Snubber may not be necessary but it is OK to have as place holder. Check the expected power dissipation of R136. May have to go to a larger case size as placeholder (e.g. 0603).

    Regards, 
    Denislav