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LMR23630-Q1: LMR23630 - Bread boarding and Testing

James L
Prodigy 10 points
Part Number: LMR23630-Q1
Other Parts Discussed in Thread: LMR23630

Hi,

I'm looking into bread boarding the LMR23630, I understand it's higher frequency and not the greatest application for a breadboard. I'm using the reference design, and have made my own makeshift groundplane/headsink for the ground pad. My schematic is based off the reference design for 5V/3A which is in the datasheet. Here are a few dumb questions:

1. The orientation of the chip.

In the datasheet there's the typical circle signifying pin one, but from pictures of the chips there's almost no markings besides the text and the gold bar on one side, would it be safe to say that the orientation can be decided from the text on the chip?

2. Testing stages

Would I be able to hookup VIN, EN_SYNC, and VCC plus ground pins (PGND, AGND, PAD) without the rest of the circuitry to test the SW signal with an oscilloscope?

3. What are some other considerations I should take when testing this on a bread board?

  • 0
    TI__Expert 4100 points
    Hello James,
    Breadboarding switch mode power supply is possible, but not always the easiest way to do. You may spend a lot of time working on your breadboard and the results could be less than expected. My recommendation is, if possible any way, to use device EVM. It is available at digikey. see link below
    www.digikey.com/.../6217844.

    As far as testing is concerned you will need to connect BOOT and FB pin for device to function.
    Switch mode power supply operate at high switching frequencies and require proper layout for expected functionality. If you breadboard the circuit, you need to make sure all connections are short, ground loops are very tight (small), input capacitor is placed very close to the IC, just to mention same. Please refer to device datasheet fro layout recommendations (same rules will apply if you breadboard).
    Once again, the recommendation is to use EVM to verify functionality for your application.
    Regards
    Brani