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TPS61022: Min Vin to keep Vout=5V, Iout=2.6A(13W)

Hisao Uchikoshi
Genius 14880 points
Part Number: TPS61022

Hi Experts,

My customer wants to know min Vin when Vout is 5V and Iout is 2.6A.

How can we estimate it?

Regards,

Uchikoshi

  • +1
    TI__Genius 9046 points

    @

    It depends on efficiency, which is influenced by inductor, temperature. VIN*EFF should be higher than 2V. Assume 85% in the worst case, the minimum Vin can reach to 2.353V.

    Calculation

    IL*(1-D)=IOUT

    IL,MAX=ILIM,MIN=6.5A

    1-D=VIN*EFF/VOUT

    IOUT=2.6A

    So VIN*EFFmin=IOUT*VOUT/IL=2.6*5/6.5=2V

    When efficiency is lower, Vin is higher, the worst case we have tested for 2Vin->5Vout/2.6A at -40C is 89%. Given 4% margin for inductance&DCR difference as well as power dissipation on capacitors, the efficiency assumption is 85%.

    2/0.85=2.353V

    -Wenhao