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TPS61322: Can/Should the NC pins be grounded

steven heitbrink
Prodigy 230 points
Part Number: TPS61322

I'm laying out a smps based on the TPS613222ADBVR . It looks like on the datasheet they short the NC pins to the closes VOUT/GND plate. If this is OK it would definitely be better for power dissipation. This this how they should be used? 

Also I've generated some WEBENCH designs, and it looks like peak to peak inductor current is purely a function of input voltage, and varies at about 77mA/V. Is this right? I must be misreading the datasheet because somehow I got the impression that the inductor current ripple is fixed at 200mA.  

  • 0
    TI__Mastermind 21565 points
    Hi Steve:
    You could do the layout with the datasheet recommended. And the current ripple is 200mA typical during the CCM.
    The WEBENCH is supported by other team. I'm not sure the detail things about the simulation model. You could apply an EVM for better design.