Discrete 1.5 to 1.35 voltage regulator

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tgq

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Hello
I am looking for a (simple) discrete LDO voltage regulator from 1.5 to 1.35V
Any help ?
Thanks
 

Diodes and LEDs are thermometers. Do you want the voltage to change when the temperature changes or as they warm up?
Transistors too. An IC voltage reference or regulator is designed to have no thermal problems.
 

It will be very hard to find opamp working with 1.5V supply.

If You really need LDO working with 1.5V supply with 1.35V of output, You should use bandgap reference (~1.25V) and make an error amp on emitter degenerated NPN BJTs
 

If a proper transistor is biased and placed in series, its VCE(sat) will already be 0.1-0.25 V,I think it's enough ..
2 Resistors and 1 silicon transistor..
 

tgq said:
thanks i know these integrted LDO
But my question was about discrete solution
Click to expand...

I know how to google and i didnt find a discrete solution
OPAMP is not discrete
 

This is a simple series regulator.

The reference is an led and diode stacked inline. The diode is added to raise the reference by 0.6V. This is needed because 0.6V is dropped across the bias-emitter junction.



Values need to be adjusted to suit.
 

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