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LM2937: Considering replacement

Taroimo
Intellectual 620 points
Part Number: LM2937
Other Parts Discussed in Thread: TPS7B83-Q1

Dear TI team

 

We are considering replacing ADI's product "LT1121CST-5#PBF" with "LM2937IMP-5.0/NOPB".

Is my understanding correct that they are pin compatible?

 

Also, when using "LM2937IMP-5.0/NOPB" over the entire operating  temperature range,

I understand that it is important to ensure a headroom voltage of 1.0V or higher, but is this correct?

 

Best Regards,

Taroimo

  • 0
    TI__Expert 4700 points

    Hi Taroimo,

    Correct, LM2937IMP-5.0/NOPB is P2P with the competitor part and your observation about the headroom voltage is correct as well. However, have you looked into using TPS7B8350QDCYRQ1? This is also P2P and the VDO = 230mV over temperature range.

    Here is a quick spec comparison:

      LT1121 LM2937 TPS7B83-Q1
    Iout(Max)(A) 0.15 0.5 0.15
    Vin(Max)(V) 36 26 40
    Vin(Min)(V) 4.17 6 3
    Vout(Max)(V) 30 15 5
    Vout(Min)(V) 3.75 5 3.3
    Fixed output options(V) Adj, 3.3, 5 5, 8, 10, 12, 15 3.3, 5
    PSRR @ 100
    KHz(dB)    		 25 57 70
    Noise(uVrms) - 150 280
    Accuracy(%) 3 5 1
    Dropout voltage
    (Vdo)(Typ)(mV)    		 420 500 160
    Iq(Typ)
    (mA)    		 0.03 2 0.02
    Output capacitor type      Ceramic Ceramic Ceramic
    Thermal resistance
    θJA(°C/W)    		 50 42 77.1

    Regards,

    Andres

  • 0 in reply to Andres Sagredo
    Intellectual 620 points

    Hi Andres,

     

    Thank you for your prompt reply.

    We will also consider "TPS7B8350QDCYRQ1"

     

    Best Regards,

    Taroimo