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TPS7A4101: Questions of TPS7A4101

Jimmy Lai
Expert 6845 points
Part Number: TPS7A4101
Other Parts Discussed in Thread: TPS7A44, TPS7A30, LM1085

Dear Team,

Do we have any LDO solution can meet the spec as below?

Vin=48

Vout/Iout=  28V(2A), 5V(30mA), -7.5(10mA), -3.4(10mA)

Many Thanks,

Jimmy

  • 0
    TI__Expert 4530 points

    Hi Jimmy,

    Are these 4 independent outputs? 

    Also, we do not have any LDOs that can generate a negative output from a positive input. This would need to be a charge-pump.

    Regards,

    Andres

  • 0 in reply to Andres Sagredo
    TI__Expert 6845 points

    Hi Andres,

    If we can generate -9V,

    could you recommend the corresponding LDOs for -7.5V and -3.4V?

    Thanks!

    Jimmy

  • 0 in reply to Jimmy Lai
    TI__Expert 4530 points

    Hi Jimmy,

    For 48V to 5V @ 30mA the best fit is TPS7A44

    For -9V to -7.5 @ 10mA the best fit is TPS7A30

    For -9V to -3.4 @ 10mA the best fit is TPS7A30

    The only conversion where an LDO may not be a good fit is 48V to 24V @ 2A, the power dissipation is too high. There might be a need to first use a DCDC to bring down the voltage before using an LDO, such as LM1085.

    Spec overview below:

      TPS7A44 TPS7A30 LM1085
    Iout(Max)(A) 0.05 0.2 3
    Vin(Max)(V) 65 -3 29
    Vin(Min)(V) 4 -36 2.6
    Vout(Max)(V) 14.5 -1.2 27.5
    Vout(Min)(V) 1.24 -33 1.25
    Fixed output options(V) 3.3, 5 --- 3.3, 5, 12
    PSRR @ 100
    KHz(dB)    		 75 55 30
    Noise(uVrms) 115 15 38
    Accuracy(%) 1 2.5 4
    Dropout voltage
    (Vdo)(Typ)(mV)    		 600 216 1300
    Iq(Typ)
    (mA)    		 0.0055 0.05 5
    Output capacitor type      --- Ceramic Non-Ceramic
    Thermal resistance
    θJA(°C/W)    		 53.7 48 23
    Operating temperature
    range(C)    		 -40 to 125 -40 to 125 -40 to 125
    Package size: mm2 9 mm2: 3 x 3 (HVSSOP|10) 9 mm2: 3 x 3 (HVSSOP|8), 9 mm2: 3 x 3 (SON|8) 155 mm2: 15.24 x 10.16 (DDPAK/TO-263|3), 47 mm2: 4.58 x 10.16 (TO-220|3)

    Regards,

    Andres