search for a voltage regulator

hi

can anyone let me know of a voltage regulator which produces a constant 2.5V regulated output when handling input ranging 2.5V-3V. it should be able to deliver around 50mA output current

k.rafa said:

hi can anyone let me know of a voltage regulator which produces a constant 2.5V regulated output when handling input ranging 2.5V-3V. it should be able to deliver around 50mA output current

Click to expand...

You say the input is between 2.5 to 3 volts and your device needs 2.5 regulated supply of 2.5v. Can you let know which is the device which doesnt tolerate .5 volts variation? Or simple solution will be using a resistor + zener combination. But still i strongly doubt the availability of precise 2.5 volt Zener diode.
Cheers

You input voltage should always more than output voltage to use a LDO. You may need to allow some .1 -.2 V drop in LDO. You can design some circuit, which may give 2.5V regulated output with more than say 2.7V input and an output equal to input with less than 2.7 by using some switches, comparator and LDO.
I found this one regulator might helpful... with P/N : TPS71725D from TI

pranam77 said:

You say the input is between 2.5 to 3 volts and your device needs 2.5 regulated supply of 2.5v. Can you let know which is the device which doesnt tolerate .5 volts variation? Or simple solution will be using a resistor + zener combination. But still i strongly doubt the availability of precise 2.5 volt Zener diode.
Cheers

Click to expand...

Sorry but there is an mistake in previous post.

My input varies from 2V-3V.

I need a regulated 2.5V, preferably DIP package IC

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umesh49 said:

You input voltage should always more than output voltage to use a LDO. You may need to allow some .1 -.2 V drop in LDO. You can design some circuit, which may give 2.5V regulated output with more than say 2.7V input and an output equal to input with less than 2.7 by using some switches, comparator and LDO.
I found this one regulator might helpful... with P/N : TPS71725D from TI

Click to expand...

Sorry but there is an mistake in previous post.

My input varies from 2V-3V.

I need a regulated 2.5V, preferably DIP package IC

My input varies from 2V-3V.

I need a regulated 2.5V

Click to expand...

There used to be a chip called the 3909. It draws power from a single 1.5V cell, to flash an led (which normally needs 1.7 V).

It can operate down to 1V. It charges an external capacitor, then switches terminals so it adds the battery voltage. The higher voltage can power an led momentarily.

I once did a search for the 3909 and found that it is obsolete since better IC's came out.

A search should turn up the kind that does what you want.

k.rafa said:

Sorry but there is an mistake in previous post.

My input varies from 2V-3V.

I need a regulated 2.5V, preferably DIP package IC

- - - Updated - - -



Sorry but there is an mistake in previous post.

My input varies from 2V-3V.

I need a regulated 2.5V, preferably DIP package IC

Click to expand...

You may need to look for some SEPIC converter based topology..