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LDO and buck converter IC suggestion

Other Parts Discussed in Thread: ADS8699, DAC1220, ADS8319, LMR33630, TPS7A47-Q1, TPS7A49, TLV767, LM63635-Q1, LM61430-Q1

Hi TI Technical Support Team,

I need help for the following two issues. 

1- In my circuit, I am using TI 20 bit DAC DAC1220 and high speed and high resolution ADCs (ADS8699, ADS8319). I need 5V and 3.3V low noise LDOs (12V input voltage) for these ADC and DAC ICs. In my previous posts in data converters forum, TI experts suggested me to use TPS7A4700, but I could not find them in the stocks (Digikey, Mouser). Could you please suggest me some available LDOs that has low noise (at microvolt level Vrms output voltage noise) that I can use to convert 12V to 5V and 3.3V voltages?

2- Main power to my circuit is from 24V 3A DC adapter. I am converting this voltage to +12V, -12V and +5V using LMR33630. But this IC is also not available in the stocks. Could you please suggest me DC DC switching regulator that I can use for my application? My input is 24Vdc 3A adapter. Maximum continuous current requirement is 1.5A and output voltages are +12V, -12V and +5V.

Thank you for your help in advance,