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Yet another ultra low noise high PSRR LDO - LT3042
Yet another ultra low noise high PSRR LDO - LT3042
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Old 3rd March 2015, 09:05 AM   #1
canvas is offline canvas  Taiwan
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Default Yet another ultra low noise high PSRR LDO - LT3042

While I was amazed by ADM7150's performance, Linear tech released their best LDO ever - LT3042

The first sub-uv noise (0.8uv RMS @ 10Hz-100KHz) LDO on the market. What do you think?

Click the image to open in full size.

Last edited by canvas; 3rd March 2015 at 09:09 AM.
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Old 3rd March 2015, 11:55 AM   #2
jackinnj is offline jackinnj  United States
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Yet another ultra low noise high PSRR LDO - LT3042
They also just announced a couple of ultra low voltage switchers LTC3424 which will get you 3.3V or 5.0V from a single Lithium cell with very low noise.
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Old 3rd March 2015, 12:25 PM   #3
Brakspear75 is offline Brakspear75  United Kingdom
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Looks very impressive, but I can't find it at either Farnell or Mouser yet - may be too new. Anyone know of a UK supplier?
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Old 5th March 2015, 12:20 AM   #4
szeto226 is offline szeto226  Hong Kong
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I have just got their email for promoting this OC. it just looks great, PSRR is superb.
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Old 5th March 2015, 03:17 PM   #5
Ken Newton is offline Ken Newton  United States
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I would like to have seen the datasheet specify the 0.1Hz to 10Hz voltage noise. That can have oscillator application phase noise implications
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Old 16th March 2015, 11:37 AM   #6
JeroenP is offline JeroenP
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Hi there, I'm new to this so please bear with me but I have a question about the LT3042.

Looking at the datasheet, they show a high current set-up of the LT3042 using an external PNP (D45VH10G) and with that it shows an Iout(max) of 1.5A rather than the standard 200mA of the LT3042.

My question is how do they get the max Iout of 1.5A?
Looking at the datasheet for the D45VH10G PNP it shows a max continuous collector current of 15A and a peak collector current of 20A. Am I missing something...?

Also, if I wanted to use the LT3042 to achieve a current draw of about 3.2A (or maybe slightly more to be safe) what would the best way to go about doing that?
I'm thinking of heating an 845 with a very clean dc power supply.

Many thanks,
Jeroen
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Old 17th March 2015, 03:19 PM   #7
SGK is offline SGK
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take a look at the relationship between collector current and base current and between collector current and Vbe for transistors and then examine what's driving the base of the D45VH10G
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Old 4th April 2015, 12:12 AM   #8
new2hifi is offline new2hifi  United States
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Default -5V

I understand that both ADM7150 and LT3042 are positive regulators.

Where is the -ve regulators?

What is there for -5V with similar performance?
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Old 10th May 2015, 06:50 AM   #9
sharpi31 is offline sharpi31  United Kingdom
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Yet another ultra low noise high PSRR LDO - LT3042
Kit available:

0.8uV Ultralow noise DAC power supply regulator 3.3V/5V 1Ax2 - DIYINHK
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Old 14th May 2015, 07:20 PM   #10
Eldam is offline Eldam  France
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What is the best option for caps at the output ? All those new LT regs are stable with ceramic ....but smd caps have some cracking piezzo noise : should we care about it for digital stuffs and swap the ceramics with other technology despite the good inductance of small X7R smd size ? bigger tantalum/polymer ? 2.5 mm pitch legs radial MKT ?
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