LM337LM National Semiconductor, LM337LM Datasheet

LM337LM

Manufacturer Part Number

LM337LM

Description

IC, ADJ LINEAR REG, 1.2V TO 37V, 8-SOIC

Manufacturer

National Semiconductor

Datasheet

1.LM337LMXNOPB.pdf (7 pages)

Specifications of LM337LM

Primary Input Voltage

40V

Output Voltage Adjustable Range

1.2V To 37V

No. Of Outputs

No. Of Pins

Output Current

100mA

Operating Temperature Range

-25Â°C To +125Â°C

Termination Type

SMD

Filter Terminals

SMD

Rohs Compliant

Current Rating

0036

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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LM337L

3-Terminal Adjustable Regulator

General Description

The LM337L is an adjustable 3-terminal negative voltage

regulator capable of supplying 100mA over a 1.2V to 37V

output range. It is exceptionally easy to use and requires

only two external resistors to set the output voltage. Further-

more, both line and load regulation are better than standard

fixed regulators. Also, the LM337L is packaged in a standard

TO-92 transistor package which is easy to use.

In addition to higher performance than fixed regulators, the

LM337L offers full overload protection. Included on the chip

are current limit, thermal overload protection and safe area

protection. All overload protection circuitry remains fully func-

tional even if the adjustment terminal is disconnected.

Normally, only a single 1µF solid tantalum output capacitor is

needed unless the device is situated more than 6 inches

from the input filter capacitors, in which case an input bypass

is needed. A larger output capacitor can be added to improve

transient response. The adjustment terminal can be by-

passed to achieve very high ripple rejection ratios which are

difficult to achieve with standard 3-terminal regulators.

Besides replacing fixed regulators, the LM337L is useful in a

wide variety of other applications. Since the regulator is

“floating” and sees only the input-to-output differential volt-

age, supplies of several hundred volts can be regulated as

long as the maximum input-to-output differential is not ex-

ceeded.

Also, it makes an especially simple adjustable switching

regulator, a programmable output regulator, or by connecting

Typical Application

DS009134

1.2V-25V Adjustable Regulator

a fixed resistor between the adjustment and output, the

LM337L can be used as a precision current regulator. Sup-

plies with electronic shutdown can be achieved by clamping

the adjustment terminal to ground which programs the out-

put to 1.2V where most loads draw little current.

The LM337L is available in a standard TO-92 transistor

package, SO-8 surface mount package, and in our new 12

mil diameter bump micro SMD package. The LM337L is

rated for operation over a −25˚C to +125˚C range.

For applications requiring greater output current in excess of

0.5A and 1.5A, see LM137 series data sheets. For the

positive complement, see series LM117 and LM317L data

sheets.

Features

n Adjustable output down to 1.2V

n Guaranteed 100mA output current

n Line regulation typically 0.01%/V

n Load regulation typically 0.1%

n Current limit constant with temperature

n Eliminates the need to stock many voltages

n Standard 3-lead transistor package

n 80 dB ripple rejection

n Output is short circuit protected

n Available in the 6-Bump micro SMD package

n See AN-1112 for micro SMD considerations

00913403

www.national.com

June 2005

Related parts for LM337LM

LM337LM Summary of contents

Page 1

... Also, it makes an especially simple adjustable switching regulator, a programmable output regulator connecting Typical Application © 2005 National Semiconductor Corporation a fixed resistor between the adjustment and output, the LM337L can be used as a precision current regulator. Sup- plies with electronic shutdown can be achieved by clamping the adjustment terminal to ground which programs the out- put to 1 ...

Page 2

... LM337LBL 6-Bump micro SMD LM337LBLX www.national.com micro SMD Laser mark 00913408 Package Marking Transport Media LM337LZ 1800 per Bag LM337LM 2.5k Units Tape and Reel 250 Units Tape and Reel PA 3k Units Tape and Reel 2 8-Pin SOIC 00913402 Top View 00913407 ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Power Dissipation Input–Output Voltage Differential Operating Junction Temperature Range Electrical Characteristics Parameter Line Regulation T (Note 3) Load Regulation T Thermal Regulation T Adjustment Pin Current 5mA ≤ ...

Page 4

Typical Applications 1.2V-25V Adjustable Regulator Full output current not available at high input-output voltages † 1µF solid tantalum or 10µF aluminum electrolytic required for stability *C2 = 1µF solid tantalum is required only if regulator is more than ...

Page 5

Physical Dimensions inches (millimeters) unless otherwise noted 8-Pin SOIC NS Package Number M08A 3-Pin TO-92 (Z) NS Package Number Z03A 5 www.national.com ...

Page 6

... BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...

Page 7

Tel: 81-3-5639-7560 ...

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