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step-down dc-dc converter question

katse vresto
Prodigy 190 points
Other Parts Discussed in Thread: TPS62110

Hi Everyone.

I have a question about power pad devices and what can happen if you rout and connect the exposed pad to ground as recommended in the data sheet but do NOT actually solder the exposed pad to the PCB. I don’t have any surface mount manufacturing tools so actually soldering an exposed pad is a problem. I’m referring to TPS62110, but can be any exposed pad device.

 

Cheers

kv

 

  • 0
    TI__Expert 3870 points
    Hi KV - There might be electrical and thermal implications if you don't connect the exposed PAD to ground. Some ICs do require the electrical connection to avoid any parameter drifts at high current operation. Inverting buck-boost topologies will not work. The thermal properties of the package will also be different if the PAD is not connected since the heat flow will be different and your max operating temperature wil have to be lower for any given power dissipation, the package temperature can rise considerably. Having a thermal pad on your PCB and not putting solder on it might cause one or both issues described and will vary from board to board and IC to IC. Please follow the datasheet to make sure your application works correctly.

    Best Regards,
    -JP