LM338T/NOPB National Semiconductor, LM338T/NOPB Datasheet

LM338T/NOPB

Manufacturer Part Number

LM338T/NOPB

Description

IC REGULATOR ADJ 5A TO220-3

Manufacturer

National Semiconductor

Type

Voltage Regulatorr

Datasheets

1.LM338TNOPB.pdf (16 pages)

2.LM338KSTEELNOPB.pdf (4 pages)

Specifications of LM338T/NOPB

Regulator Topology

Positive Adjustable

Voltage - Output

1.2 ~ 32 V

Voltage - Input

4.2 ~ 40 V

Number Of Regulators

Current - Output

Current - Limit (min)

Operating Temperature

0°C ~ 125°C

Mounting Type

Through Hole

Package / Case

TO-220-3 (Straight Leads)

Current, Output

5 A

Package Type

TO-220

Regulation, Line

0.005 %/V

Regulation, Load

0.1 %

Regulator Type

Positive Voltage Out

Resistance, Thermal, Junction To Case

4 °C/W

Temperature, Operating, Range

0 to +125 °C

Voltage, Input

-0.3 to +40 V

Voltage, Noise

0.003 %

Voltage, Output

1.2 to 32 V

Voltage, Supply, Rejection Ratio

60 dB

1024

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Voltage - Dropout (typical)

Lead Free Status / Rohs Status

RoHS Compliant part Electrostatic Device

Other names

*LM338T
*LM338T/NOPB
LM338T

Available stocks

Company

Part Number

Manufacturer

Quantity

Price

Company:

Meier Automation Equipment Co., Limited

Part Number:

LM338T/NOPB

Manufacturer:

TI/德州仪器

Quantity:

20 000

Company:

Amily Shenzhen XNWY Technology Co., Ltd

Part Number:

LM338T/NOPB

Current page: 1 of 16
Download datasheet (397Kb)

LM138/LM338

5-Amp Adjustable Regulators

General Description

The LM138 series of adjustable 3-terminal positive voltage

regulators is capable of supplying in excess of 5A over a

1.2V to 32V output range. They are exceptionally easy to

use and require only 2 resistors to set the output voltage.

Careful circuit design has resulted in outstanding load and

line regulation — comparable to many commercial power

supplies. The LM138 family is supplied in a standard 3-lead

transistor package.

A unique feature of the LM138 family is time-dependent cur-

rent limiting. The current limit circuitry allows peak currents

of up to 12A to be drawn from the regulator for short periods

of time. This allows the LM138 to be used with heavy tran-

sient loads and speeds start-up under full-load conditions.

Under sustained loading conditions, the current limit de-

creases to a safe value protecting the regulator. Also in-

cluded on the chip are thermal overload protection and safe

area protection for the power transistor. Overload protection

remains functional even if the adjustment pin is accidentally

disconnected.

Normally, no capacitors are needed unless the device is situ-

ated more than 6 inches from the input filter capacitors in

which case an input bypass is needed. An output capacitor

can be added to improve transient response, while bypass-

ing the adjustment pin will increase the regulator’s ripple re-

jection.

Connection Diagrams

Order Number LM138K STEEL or LM338K STEEL

See NS Package Number K02A

Metal Can Package

(TO-3 STEEL)

Bottom View

(See Physical Dimension section for further information)

DS009060

DS009060-30

Besides replacing fixed regulators or discrete designs, the

LM138 is useful in a wide variety of other applications. Since

the regulator is “floating” and sees only the input-to-output

differential voltage, supplies of several hundred volts can be

regulated as long as the maximum input to output differential

is not exceeded, i.e., do not short-circuit output to ground.

The part numbers in the LM138 series which have a K suffix

are packaged in a standard Steel TO-3 package, while those

with a T suffix are packaged in a TO-220 plastic package.

The LM138 is rated for −55˚C T

is rated for 0˚C

Features

n Guaranteed 7A peak output current

n Guaranteed 5A output current

n Adjustable output down to 1.2V

n Guaranteed thermal regulation

n Current limit constant with temperature

n P

n Output is short-circuit protected

Applications

n Adjustable power supplies

n Constant current regulators

n Battery chargers

Product Enhancement tested

See NS Package Number T03B

Order Number LM338T

Plastic Package

Front View

+125˚C.

(TO-220)

+150˚C, and the LM338

DS009060-31

www.national.com

May 1998

Related parts for LM338T/NOPB

LM338T/NOPB Summary of contents

Page 1

... DS009060-30 Bottom View Order Number LM138K STEEL or LM338K STEEL See NS Package Number K02A © 1999 National Semiconductor Corporation DS009060 Besides replacing fixed regulators or discrete designs, the LM138 is useful in a wide variety of other applications. Since the regulator is “floating” and sees only the input-to-output ...

Page 2

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. (Note 4) Power Dissipation Input/Output Voltage Differential Storage Temperature Electrical Characteristics Specifications with standard type face are for T ture Range. Unless otherwise specified, V ...

Page 3

Electrical Characteristics Symbol Parameter V Temperature Stability R/T I (Min) Minimum Load Current LOAD I Current Limit CL V RMS Output Noise OUT Ripple Rejection Ratio Long-Term Stability Thermal Resistance JC Junction to Case Thermal Resistance, ...

Page 4

Typical Performance Characteristics Temperature Stability DS009060-38 Ripple Rejection DS009060-41 Line Transient Response DS009060-44 Application Hints In operation, the LM138 develops a nominal 1.25V reference voltage between the output and adjustment terminal. REF The reference voltage is impressed across ...

Page 5

Application Hints (Continued) DS009060-6 FIGURE 1. Since the 50 µA current from the adjustment terminal repre- sents an error term, the LM138 was designed to minimize I and make it very constant with line and load changes. ADJ To do ...

Page 6

Application Hints (Continued) D1 protects against C1 D2 protects against C2 www.national.com DS009060-8 FIGURE 3. Regulator with Protection Diodes 6 ...

Page 7

Typical Applications Regulator and Voltage Reference DS009060-3 1.2V–25V Adjustable Regulator Temperature Controller Full output current not available at high input-output voltages † Optional — improves transient response. Output capacitors in the range of 1 µF to 1000 µF of aluminum ...

Page 8

Schematic Diagram www.national.com 8 ...

Page 9

Typical Applications Precision Power Regulator with Low Temperature Coefficient * Adjust for 3.75 across R1 Slow Turn-On 15V Regulator High Stability 10V Regulator Adjustable Regulator with Improved Ripple Rejection DS009060-13 † Solid tantalum * Discharges C1 if output is shorted ...

Page 10

Typical Applications (Continued) * Minimum load — 100 mA 5V Logic Regulator with Electronic Shutdown ** Minimum output 1.2V www.national.com 15A Regulator ** Light Controller DS009060-18 10 DS009060-17 DS009060-11 ...

Page 11

Typical Applications (Continued 240 , for LM138 Full output current not available at high input-output voltages 0 to 22V Regulator DS009060-19 12V Battery Charger 11 DS009060-20 www.national.com ...

Page 12

Typical Applications (Continued) Adjustable Current Regulator 5A Current Regulator DS009060-23 Adjusting Multiple On-Card Regulators with Single Control † Minimum load — ± * All outputs within 100 mV www.national.com Precision Current Limiter DS009060-21 Tracking Preregulator 12 DS009060-22 DS009060-24 ...

Page 13

Typical Applications (Continued 10k 100 10 100k Bandwidth 100 kHz Distortion 0.1% Use of R allows low charging ...

Page 14

Typical Applications (Continued) Adjustable 15A Regulator * Minimum load — 100 mA www.national.com Current Limited 6V Charger * Set max charge current THE 1000 µF is recommended to filter out input transients. DS009060-26 10A Regulator 14 ...

Page 15

Physical Dimensions inches (millimeters) unless otherwise noted Order Number LM138K or LM338K STEEL 2 Lead TO-3 Metal Can Package (K) NS Package Number K02A 3 Lead Molded TO-220 (T) Order Number LM338T NS Package Number T03B 15 www.national.com ...

Page 16

... National Semiconductor Asia Pacific Customer Fax: +49 (0) 1 80-530 85 86 Response Group Email: europe.support@nsc.com Tel: 65-2544466 Fax: 65-2504466 Tel: +49 (0) 1 80-532 78 32 Email: sea.support@nsc.com Tel: +49 (0) 1 80-534 16 80 National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507 ...

Related keywords

lm338
lm338k
lm338t
LM338T/NOPB datasheet
LM338T/NOPB data sheet
LM338T/NOPB pdf datasheet
LM338T/NOPB component
LM338T/NOPB part
LM338T/NOPB distributor
LM338T/NOPB RoHS
LM338T/NOPB datasheet download