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LM26480: Can buck 1 output be set at 3.3v?

Ken Zhang
Expert 3625 points
Part Number: LM26480


hi, 

 With LM26480, my customer had set its buck 1 output at 3.3V@500mA. 3.3v is out of (Buck1 : 0.8 V to 2 V at 1.5 A) that the recommended range of buck 1 listed in LM26480 datasheet . is there any risk?

customer schematic is attached for your reference.

  • 0
    TI__Intellectual 2101 points

    Hey Ken.

    Using a component configuration outside the output regulator's range may cause issues with stability and ripple. We cannot guarantee there won't be any risks for this case, although it is likely the voltage will be clamped by the internal comparators (Clamped to 2V).

    Is there a reason why they're using Buck1 for the 3.3V rail? The schematic shows that Buck2 is 1.2V (Even though the table says 2.5V) so I think the better option for the customer is to swap rails 1 and 2. Note that for the 3.3V rail, an extra 33pF is highly recommended in series with the 6pF output capacitor.

    Best,

    David Martinez