LM138, LM338
SNVS771C – MAY 1998 – REVISED DECEMBER 2016
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Table of Contents
1 Features .................................................................. 1
2 Applications ........................................................... 1
3 Description ............................................................. 1
4 Revision History..................................................... 2
5 Pin Configuration and Functions ......................... 3
6 Specifications......................................................... 3
6.1 Absolute Maximum Ratings ...................................... 3
6.2 Recommended Operating Conditions....................... 3
6.3 Thermal Information .................................................. 4
6.4 Electrical Characteristics: LM138.............................. 4
6.5 Electrical Characteristics: LM338.............................. 5
6.6 Typical Characteristics .............................................. 6
7 Detailed Description .............................................. 9
7.1 Overview ................................................................... 9
7.2 Functional Block Diagram ......................................... 9
7.3 Feature Description................................................... 9
7.4 Device Functional Modes........................................ 10
8 Application and Implementation ........................ 11
8.1 Application Information............................................ 11
8.2 Typical Applications ................................................ 12
8.3 System Examples ................................................... 17
9 Power Supply Recommendations...................... 23
10 Layout................................................................... 23
10.1 Layout Guidelines ................................................. 23
10.2 Layout Example .................................................... 23
11 Device and Documentation Support ................. 24
11.1 Receiving Notification of Documentation Updates 24
11.2 Related Links ........................................................ 24
11.3 Community Resources.......................................... 24
11.4 Trademarks ........................................................... 24
11.5 Electrostatic Discharge Caution ............................ 24
11.6 Glossary ................................................................ 24
12 Mechanical, Packaging, and Orderable
Information ........................................................... 24
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision B (April 2013) to Revision C
Page
• Added Device Information table, Pin Configuration and Functions section, Specifications section, Recommended
Operating Conditions table, Thermal Information table, Detailed Description section, Application and Implementation
section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and
Mechanical, Packaging, and Orderable Information section .................................................................................................. 1
• Deleted RETS138K military specification reference from Absolute Maximum Ratings table................................................. 3
• Changed Junction to Ambient, RθJA, value in Thermal Information table From: 50°C/W To: 22.9°C/W (NDE) ..................... 4
• Changed Junction to Case, RθJC(top), value in Thermal Information table From: 4°C/W To: 15.7°C/W (NDE) ....................... 4
Changes from Revision A (April 2013) to Revision B
Page
• Changed layout of National Semiconductor Data Sheet to TI format .................................................................................... 1
2
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