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APPLICATION INFORMATION

C1

+

C2

R1

R2

+

INPUT

OUTPUT

ADJUSTMENT

LM237

or

LM337

C1 is a 1-

µF solid tantalum capacitor required only if the regulator is more than 10 cm (4 in) from the power-supply filter capacitor.

C2 is a 1-

µF solid tantalum or 10-µF aluminum electrolytic capacitor required for stability.

R2 + R1

–V

O

–1..25 *

1

R1 typically is 120

Ω.

ADJUSTMENT

OUTPUT

INPUT

LM237

or

LM337

1.25 V

LM237, LM337

3-TERMINAL ADJUSTABLE REGULATORS

SLVS047J – NOVEMBER 1981 – REVISED MAY 2007

Figure 1. Adjustable Negative-Voltage Regulator

Figure 2. Current-Limiting Circuit

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