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REG103: Similar device with small Cout

Holly Gu
Intellectual 2750 points
Part Number: REG103
Other Parts Discussed in Thread: LM317M, TPS7A24,

Hi Team, 

   Ctm need a LDO with similar function like REG103GA-A/2K5, but need Vo=7.7V or 12V. Most LDO we are using has Cout=1uF, which is not acceptable in some use scenario, so we are seek for the LDO

  • Io>150mA
  • No need for Cout or smaller Cout
  • 0
    TI__Expert 4810 points

    Hi Holly,

    Are there any input voltage requirements for your application?

    Regards,

    Andres

  • 0
    TI__Intellectual 2750 points

    Hi Andres,

       For more details, pls see below

    • Io>150mA
    • 8V<Vin<15V
    • Vo=7.7V and 12V
    • No need for Cout or smaller Cout (<0.47uF, smaller better)
  • +1 in reply to Holly Gu
    TI__Expert 4810 points

    Hi Holly,

    Thank you for the additional details.

    Given these parameters my recommendation would be LM317M, however given its dropout Vin can only go as low as ~9.5V to meet the Vo=7.7V requirement. This device will work without an output capacitor.

    TPS7A24 has a low enough dropout to meet Vo=7.7V at a Vin=8V, but it requires an output capacitor of at least 1uF which would not meet the capacitor requirement.

    Is your customer using a competitor device which meets all the requirements? If so, could you share details of this device?

    Please see the table below comparing our LDOs:

      REG103GA-A/2K5 LM317MDCYR TPS7A2401DBVR
    Generic Part Number REG103 LM317M TPS7A24
    Iout(Max)(A) 0.5 0.5 0.2
    Vin(Max)(V) 15 40 18
    Vin(Min)(V) 2.7 3.75 2.4
    Vout(Max)(V) 5.5 37 17.75
    Vout(Min)(V) 1.3 1.2 1.24
    Fixed Voltage(V) ADJ ADJ ADJ
    PSRR @ 100
    KHz(dB)    		 20 22 22
    Noise(uVrms) 33 38 300
    Accuracy(%) 2 3 2
    Dropout voltage
    (Vdo)(Typ)(mV)    		 115 2000 160
    Iq(Typ)
    (mA)    		 1 5 0.002
    Minimum Cap (uF)   0 0 1
    Thermal resistance
    θJA(°C/W)    		 150 60 167.8
    Operating temperature
    range(C)    		 -40 to 85 -40 to 125 -40 to 125
    Package SOT-223|6 SOT-223|4 SOT-23|5
    Comment High dropout will not meet Vo=7.7V if Vin=8V. Meets 12V requirement. Does not need an output capacitor. Low dropout will meet both output requirements. Needs an output capacitor of at least 1uF, which means it will not meet Cout requirement.