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tell me suitable LDO

Masaharu Takahashi
Expert 4170 points
Other Parts Discussed in Thread: TLV767, TPS7A37, TPS7A91, TPS7A83A

hi, Team.

could you tell me what device we might suggest based on below spec?

Vout:1.1V(fixed is suitable

Iout:1A over

Vin:5V(3.3v is also ok)

  • 0
    TI__Mastermind 44280 points

    HI Takahashi-san,

    We have many 1A LDO's, but the issue here is thermal. Ideally, you would want to go with the minimum drop-out so having VIN of 3.3V is better than 5V if VOUT is 1.1V.  So from 3.3VIN to 1.1VOUT at 1A, this is 2W of power dissipation. Here are a few LDO's to compare:

    Part Number Peak Load Current (A) VIN VOUT PDISS (W) TJA T_AMBIENT ºC TJ Maximum Recommended Current (A)
    TLV757 (2x2 SON) 1 3.3 1.1 2.2 100.2 25 245.44 0.45
    TLV767 (2x2 SON) 1 3.3 1.1 2.2 77.7 25 195.94 0.59
    TPS7A37 (2x2 SON) 1 3.3 1.1 2.2 67.2 25 172.84 0.68
    TPS7A91 (2.5x2.5) 1 3.3 1.1 2.2 56.9 25 150.18 0.8
    TPS7A83A (3.5x3.5) 1 3.3 1.1 2.2 43.4 25 120.48 1.05
    TPS7A83A (5x5) 1 3.3 1.1 2.2 33.4 25 98.48 1.36

    Note: the TPS7A83A is a 2A LDO. 

    Does this help?

  • 0 in reply to JCHK
    TI__Expert 4170 points

    Hi, John-san.

    it has been while.

    thanks your reply.

    Don't we have 1.1 fixd output LDO ?

    I should've understood that the list on your post that we do have 1.1V fixed or other LDO which can output 1.1V.

    but there some LDOs can't do it.

    could you re-check?

  • 0 in reply to Masaharu Takahashi
    TI__Mastermind 44280 points

    HI Takahashi-san,

    お久しぶりですね！

    For fixed output, we have the TPS74611-Q1. I added it to the thermal analysis below:

    Keep in mind the TPS7A83A is a fixed output with its Any-Out(TM) feature. See example below:

    I hope this helps.

    Regards,