LM237, LM337

3-TERMINAL ADJUSTABLE REGULATORS

SLVS047G – NOVEMBER 1981 – REVISED SEPTEMBER 2003

5

POST OFFICE BOX 655303

APPLICATION INFORMATION

C1

+

C2

R1

R2

+

INPUT

OUTPUT

ADJUSTMENT

LM237

or

LM337

VO

VI

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.

, where VO is the output in volts.

Figure 1. Adjustable Negative-Voltage Regulator

ADJUSTMENT

OUTPUT

INPUT

VI

RS

VO

LM237

or

LM337

RS =

1.25 V

ILIMIT

Figure 2. Current-Limiting Circuit