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TPS74201: VIN, VBIAS setting

Prodigy 120 points

Replies: 2

Views: 41

Part Number: TPS74201

Is this usage correct?

 VOUT = 2.5V, IOUT = 1.5A

 VIN = VBIAS = 3.3V

We would like to get VOUT=2.5V.

  • Hello,

    If you tie the Vin to Vbias, then the worst case dropout voltage is 1.4V.
    So using a worst case analysis, you would need 2.5 + 1.4 = 3.9V on the Vin=Vbias pins to achieve 2.5V.
    See the snapshot from the TPS742 datasheet below.

    If 3.9V is not available, the TPS7A52 looks like a very good choice in this case.
    The dropout voltage is much smaller for this new device and you would be able to use a 3.3V input like this to generate 2.5V at 1.5A.

    Thanks,

    - Stephen

  • In reply to Stephen Ziel:

    Stephen, thank you very much.

    I understood very well.

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