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Has the 3 terminal operation becomes unstable if output pin pulled up?

Latest Updated:12/01/2011

Question:

The operation of the 3-terminal regulator becomes unstable when the OUTPUT pin is pulled up with a resistor.

Answer:

The 3-terminal regulator is designed on the assumption that a current is supplied to the load.
If a current is supplied to its OUTPUT pin from an external source, the regulator becomes uncontrollable and cannot operate normally.

Once the regulator has become uncontrollable, it may not recover until the power is turned off. Therefore, do not pull up the OUTPUT pin.

Suitable Products
3 Terminal Regulators