OUT

R2

V

1.25 V 1

240

§

·

¨

¸

:

©

¹

LM337L

+

+

VIN

VOUT

ADJ

C2

C1

1 µF

-VIN

R1

240

Ÿ

R2

Copyright © 2016, Texas Instruments Incorporated

8

LM337L

SNVS780E – MAY 1998 – REVISED DECEMBER 2016

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Product Folder Links: LM337L

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Copyright © 1998–2016, Texas Instruments Incorporated

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The LM337L is a negative output linear regulator with high accuracy and a wide temperature range. An output

capacitor can be added to further improve transient response, and the ADJ pin can be bypassed to achieve very

high ripple-rejection ratios. The device's functionality can be utilized in many different applications that require

negative voltage supplies, such as bipolar amplifiers, operational amplifiers, and constant current regulators.

8.2 Typical Applications

8.2.1 1.2-V to 25-V Adjustable Regulator

Full output current not available at high input-output voltages

†C1 = 1-μF solid tantalum or 10-μF aluminum electrolytic required for stability

*C2 = 1-μF solid tantalum is required only if regulator is more than 4″ from power supply filter capacitor

Figure 6. 1.2-V to 25-V Adjustable Regulator Diagram

8.2.1.1 Design Requirements

The device component count is very minimal, employing two resistors as part of a voltage divider circuit and an

output capacitor for load regulation. An input capacitor is needed if the device is more than 4 in. from the filter

capacitors.

8.2.1.2 Detailed Design Procedure

The output voltage is set based on the selection of the two resistors (R1 and R2) as shown in Equation 1.

(1)