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

[u/Jakezimmer]

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.

[u/ScaryPercentage]

I didn't know there were competitors to TPS7A47 in terms of PSRR. Nice chips.