35V+ LDO regulator?

[dgta]

Does anyone know of a low dropout regulator that can take 35V or more on the input? Only needs to supply about 50mA. Thanks.

 

[jackinnj]

LT3014

 

[dgta]

Thanks Jack. That one can only do 20mA. Not enough.

Also, I need it to be available in a leaded package so I can breadboard easily.

 

[Frex]

Hi,

Dgta, why do you need LDO ? To made 34V with 35V ?
LDO are generally use with low voltage.

FRex

 

[dgta]

Yes, I have a circuit where I need to regulate to 30V and under the worst conditions my input + ripple will be below 32V. I tried a 317 and it's not good enough.

 

[AndrewT]

Build one with a Pchannel mosFET as the series element.

Or make a -ve supply with an Nchannel mosFET.

 

[jackinnj]

Supertex LR12 -- Mouser carries them, or you can just request samples from the company. You can also use a LED driver.

 

[dgta]

LR12 requires Vin-Vout of at least 12V. That's about as NON-LDO as it gets 🙂

 

[RJM1]

LT3080
Input Voltage 36V
Output Voltage0 to 30V
Dropout Voltage@Current (Max) 0.2@100mA/0.5@1100mA
Dropout Voltage@Current (Typ)0.1@100mA
Output Current1.1A
5-LEAD PLASTIC TO-220
http://download.siliconexpert.com/pdfs/2011/9/18/0/48/46/997/ltc_/manual/3080f.pdf

 

[dgta]

Yes. Thank you. That barely does what I need, but it does.

Interesting part. It has an open collector output. So it's only LDO with respect to the power input, as long as you can provide a higher voltage for the control input. If you only have one input voltage, then it's only semi- LDO at 1.2V in-out.

 

[RJM1]

You could always do this.

 

[qusp]

lt1083/4/5, officially it isnt meant for this high voltage, but as long as you respect the input-output differential it will take a couple hundred volts

 

[dgta]

You could always do this.

Yes I intend to do exactly that.