LM34926

SNVS847E – JUNE 2012 – REVISED DECEMBER 2014

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Table of Contents

7.2

Functional Block Diagram ......................................... 8

1

Features .................................................................. 1

7.3

Feature Description................................................... 9

2

Applications ........................................................... 1

7.4

Device Functional Modes........................................ 13

3

Description ............................................................. 1

8

Application and Implementation ........................ 14

4

Revision History..................................................... 2

8.1

Application Information............................................ 14

5

Pin Configuration and Functions ......................... 3

8.2

Typical Application .................................................. 14

6

Specifications......................................................... 4

9

Power Supply Recommendations ...................... 20

6.1

Absolute Maximum Ratings ..................................... 4

10

Layout................................................................... 20

6.2

Handling Ratings....................................................... 4

10.1

Layout Guidelines ................................................. 20

6.3

Recommended Operating Ratings............................ 4

10.2

Layout Example .................................................... 20

6.4

Thermal Information .................................................. 4

11

Device and Documentation Support ................. 21

6.5

Electrical Characteristics........................................... 5

11.1

Trademarks ........................................................... 21

6.6

Switching Characteristics .......................................... 6

11.2

Electrostatic Discharge Caution ............................ 21

6.7

Typical Characteristics .............................................. 6

11.3

Glossary ................................................................ 21

7

Detailed Description .............................................. 8

12

Mechanical, Packaging, and Orderable

7.1

Overview ................................................................... 8

Information ........................................................... 21

4 Revision History

Changes from Revision D (December 2013) to Revision E

Page

•

Added Pin Configuration and Functions section, Handling Rating table, Switching Characteristics table, Feature

Description section, Device Functional Modes, Application and Implementation section, Power Supply

Recommendations section, Layout section, Device and Documentation Support section, and Mechanical,

Packaging, and Orderable Information section ..................................................................................................................... 1

•

CMS Request No.: C1411181 ................................................................................................................................................ 1

•

Changed Thermal Information table ....................................................................................................................................... 4

•

Changed Control Overview section ........................................................................................................................................ 9

•

Changed Soft-Start Circuit, Isolated Fly-Buck Converter graphics. ..................................................................................... 13

•

Deleted Lowest Part Count Isolated Application Schematic ............................................................................................... 19

Changes from Revision C (December 2013) to Revision D

Page

•

Added Thermal Parameters ................................................................................................................................................... 4

Changes from Revision B (March 2013) to Revision C

Page

•

Changed formatting to the TI standard................................................................................................................................... 1

•

Changed minimum operating input voltage from 9 V to 7.5 V in Features, Typical Application, Pin Descriptions,

Recommended Operating Ratings ........................................................................................................................................ 1

•

Added Absolute Maximum Junction Temperature.................................................................................................................. 4

Changes from Revision A (March 2013) to Revision B

Page

•

Added SW to RTN (100 ns transient) in Absolute Maximum Ratings ................................................................................... 4

Changes from Original (March 2013) to Revision A

Page

•

Changed layout of National Data Sheet to the TI standards................................................................................................ 20

2

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