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LR12

A081605

High Input Voltage

Adjustable 3-Terminal Linear Regulator

Features

Applications

General Description

The Supertex LR12 is a high voltage, low output current, adjustable

linear regulator. It has a wide operating input voltage range of

13.2V to 100V. The output voltage can be adjusted from 1.20V to

88V provided that the input voltage is at least 12V greater than the

output voltage. The output voltage can be adjusted by means of

and ADJ pins to a nominal value of 1.20V. The 1.20V is amplified

current of typically 10µA is connected to the ADJ pin. This

The LR12 has current limiting and temperature limiting. The

output current limit is 100mA maximum and the minimum

temperature limit is 125°C. An output short circuit current will

therefore be limited to 100mA maximum. When the junction

temperature reaches its temperature limit, the output current and/

or output voltage will decrease to keep the junction temperature

from exceeding its temperature limit. For SMPS start-up circuit

applications, the LR12 turns off when an external voltage greater

To maintain stability, a bypass capacitor of 100nF or larger and a

minimum DC output current of 500µA are required.

The device is available in TO-92, SO-8, and TO-252 (D-PAK)

packages.

LR12 Typical Application

V

OUT

ADJ

V

IN

*

R1

R2

C2

C1

1.2V to 88V

13.2V to

100V

LR12

LR12

A081605