TPS61085

SLVS859B – JUNE 2008 – REVISED DECEMBER 2014

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Table of Contents

8.3

Feature Description................................................... 8

1

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

8.4

Device Functional Modes.......................................... 8

2

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

9

Application and Implementation .......................... 9

3

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

9.1

Application Information.............................................. 9

4

Simplified Schematic............................................. 1

9.2

Typical Application .................................................... 9

5

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

9.3

System Examples ................................................... 15

6

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

10

Power Supply Recommendations ..................... 18

7

Specifications......................................................... 3

11

Layout................................................................... 19

7.1

Absolute Maximum Ratings ...................................... 3

11.1

Layout Guidelines ................................................. 19

7.2

ESD Ratings.............................................................. 3

11.2

Layout Example .................................................... 19

7.3

Recommended Operating Conditions ....................... 4

12

Device and Documentation Support ................. 20

7.4

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

12.1

Trademarks ........................................................... 20

7.5

Electrical Characteristics........................................... 4

12.2

Electrostatic Discharge Caution ............................ 20

7.6

Typical Characteristics .............................................. 5

12.3

Glossary ................................................................ 20

8

Detailed Description .............................................. 7

13

Mechanical, Packaging, and Orderable

8.1

Overview ................................................................... 7

Information ........................................................... 20

8.2

Functional Block Diagram ......................................... 7

5 Revision History

Changes from Revision A (April 2012) to Revision B

Page

•

Added ESD Ratings 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

Changes from Original (June 2008) to Revision A

Page

•

•

Deleted Lead Temperature from the Abs Max table .............................................................................................................. 3

•

Added a conditions statement and two new graphs (Max Load Current vs Input Voltage) to the Typical

Characteristics graphs ............................................................................................................................................................ 5

•

Added three paragraphs of text to the Detailed Description. ................................................................................................. 7

•

Changed Figure 8 to Figure 17 .............................................................................................................................................. 9

•

Changed the Design Procudures step 3 details following Equation 4 ................................................................................ 10

•

Changed text in the Inductor Selection section "inductor current ripple is below 20%" to " inductor current ripple is

below 35%" .......................................................................................................................................................................... 10

•

Changed Equation 8 ............................................................................................................................................................. 12

•

•

Added Equation 10 ............................................................................................................................................................... 13

•

Changed the White LED Applications optional Zener connection for Figure 19 to Figure 21.............................................. 17

2

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