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Power Management

Q&A Using LT3045 with LTC2972

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Using LT3045 with LTC2972

esvau on Aug 22, 2019

I need a ultra low noise power supply with power and sequence control. Can i use a LTC2973 with two LT3045 ultra low noise LDO for this?

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ACaldejon
Aug 23, 2019 +1 suggested
Hi,

Yes, Just as long as EN/UV voltage of LT3045 reaches/exceeds 1.24V (EN/UV pin threshold:Rising) or higher to turn it ON.
And according to specs of LTC2972 Vout_en is capable of up to 15V. So I think…

0 ACaldejon

on Aug 23, 2019 7:56 AM
Hi,

Yes, Just as long as EN/UV voltage of LT3045 reaches/exceeds 1.24V (EN/UV pin threshold:Rising) or higher to turn it ON.
And according to specs of LTC2972 Vout_en is capable of up to 15V. So I think there will be no problem using that combination.

Regards,
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0 esvau on Aug 26, 2019 1:01 PM in reply to ACaldejon

Hi,

thanks for your answer. My next question is: How can build the current monitor and voltage fine adjustment without decrease the performance by LT3045 (Noise, PSRR)?

With best regards
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0 ACaldejon

on Aug 27, 2019 11:39 PM in reply to esvau
Hi,

You can refer to the "Applications information" section of the datasheet. There you can find how to improve LT3045 perfomance in reference to noise and PSRR.

Regards,
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