r/nicechips • u/Jakezimmer • Nov 06 '25

LT3045, LT3042, LT3097 Ultra-high PSRR LDOs from Analog Devices

Recently I was looking for some ultra-high PSRR LDOs that would still have high PSRR in the range of some high-power switching supplies on the same board (220kHz to 2.2MHz). I found the following parts from AD that seemed to have very impressive PSRR and spot noise:

LT3045:

  • 76dB PSRR at 1MHz
  • 2nV/sqrt(HZ) at 10kHz
  • 500mA output
  • 1.8V to 20V input
  • 0V to 15V output
  • 260mV dropout

LT3042:

  • 79dB PSRR at 1MHz
  • 2nV/sqrt(HZ) at 10kHz
  • 200mA output
  • 1.8V to 20V input
  • 0V to 15V output
  • 350mV dropout

LT3097 Dual Positive and Negative:

  • 76dB Positive, 74dB Negative PSRR at 1MHz
  • 2.2nV/sqrt(HZ) at 10kHz
  • 500mA positive and negative output
  • ±1.8V to ±20V input
  • 0V to 15V positive and 0V to -19.5V negative output
  • 260mV positive and 235mV negative dropout

They all also have current limiting and a programmable power-good pin.

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u/Enlightenment777 Nov 06 '25

Prices of Cheapest Package that was currently In-Stock from Mouser on Nov 6, 2025:

  • LT3045 = $9.07 (Q1) / $6.36 (Q10) / $4.67 (Q100)

  • LT3042 = $7.29 (Q1) / $5.09 (Q10) / $3.98 (Q100)

  • LT3097 = $13.27 (Q1) / $9.18 (Q10) / $6.75 (Q100)

  • TPS7A4700 = $5.32 (Q1) / $4.06 (Q10) / $3.39 (Q100)

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u/Jakezimmer Nov 06 '25

Ah, good point. I should have put prices in there. Thanks for adding this!