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0-5V adjustable voltage regulators?

Anyone know of an adjustable voltage regulator that:
-outputs 0-5V (or 1-5V)
-can source 100mA over that range
-is powered by 6V

?

Thanks.

KCJ
 
D

D from BC

Jan 1, 1970
0
Anyone know of an adjustable voltage regulator that:
-outputs 0-5V (or 1-5V)
-can source 100mA over that range
-is powered by 6V

?

Thanks.

KCJ

A low drop out type might be needed.
~1V to 5V adjustment more probable due to internal references
typically around 1V to 1.5V.
As an example:
http://www.fairchildsemi.com/ds/FA/FAN1117A.pdf
It's not great but all I can think of for now..
D from BC
 
E

ehsjr

Jan 1, 1970
0
Anyone know of an adjustable voltage regulator that:
-outputs 0-5V (or 1-5V)
-can source 100mA over that range
-is powered by 6V

?

Thanks.

KCJ

A dc-dc converter chip like the TI MC33063 and a few external
components will do it, except the minimum is 1.25 volts.

http://focus.ti.com/lit/ds/symlink/mc33063a.pdf

Since your current requirement is low, you can use a
trick to get down below 1 volt:

Vin--[Regulator]Vout---+
| |
| [Load]
| |
| [D1]
| |
| [D2]
| |
Gnd ------+------------+

or
Vin--[Regulator]Vout---+
| |
| [Load]
| |
+------------+
|
[D1]
|
[D2]
|
Gnd ------+

If you short out D1 and D2 when Vout needed
is above 1.25, you get better regulation.

Note that [Regulator] above is used to
represent the complete regulator circuit
and its associated components - the drawings
are intended to show only the addition of the
two diodes, not the complete circuit.

Ed
 
W

whit3rd

Jan 1, 1970
0
Anyone know of an adjustable voltage regulator that:
-outputs 0-5V (or 1-5V)
-can source 100mA over that range
-is powered by 6V

Most 'adjustable regulators' use a resistor divider on the
output and compare to a fixed (1.2V typically) reference, so
they only go to 1.2V minimum. Three-terminal and four-terminal
regulators are ruled out.

The LM10 op amp includes a voltage reference, and can get close
enough to the rails to do what you want, except the 100 mA
part. Can you settle for 20 mA?

Add a pass transistor to the LM10 and it's easy.
 
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