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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
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
Hi Andres,
Thank you for your prompt reply.
We will also consider "TPS7B8350QDCYRQ1"
Best Regards,
Taroimo