LP8557, LP85571

SNVSA15B – DECEMBER 2013 – REVISED DECEMBER 2015

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Table of Contents

8.2

Functional Block Diagram ....................................... 11

1

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

8.3

Feature Description................................................. 12

2

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

8.4

Device Functional Modes........................................ 20

3

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

8.5

Programming........................................................... 20

4

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

8.6

Register Maps ......................................................... 24

5

Device Comparison Table..................................... 3

9

Application and Implementation ........................ 31

6

Pin Function and Configurations ......................... 3

9.1

Application Information............................................ 31

7

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

9.2

Typical Applications ............................................... 34

7.1

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

10

Power Supply Recommendations ..................... 38

7.2

ESD Ratings.............................................................. 4

11

Layout................................................................... 38

7.3

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

11.1

Layout Guidelines ................................................. 38

7.4

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

11.2

Layout Example .................................................... 42

7.5

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

12

Device and Documentation Support ................. 43

7.6

Boost Converter Electrical Characteristics................ 5

12.1

Device Support .................................................... 43

7.7

LED Driver Electrical Characteristics (LED1 To LED6

12.2

Related Links ........................................................ 43

Pins) ........................................................................... 5

12.3

Community Resources.......................................... 43

7.8

PWM Interface Characteristics (PWM Pin) ............... 6

12.4

Trademarks ........................................................... 43

7.9

Logic Interface Characteristics

(PWM, FSET/SDA, ISET/SCL Pins) .......................... 6

12.5

Electrostatic Discharge Caution ............................ 43

7.10

I2C Serial Bus Timing Parameters (SDA, SCL) ..... 7

12.6

Glossary ................................................................ 43

7.11

Typical Characteristics ............................................ 8

13

Mechanical, Packaging, and Orderable

8

Detailed Description ............................................ 11

Information ........................................................... 43

8.1

Overview ................................................................. 11

4 Revision History

Changes from Revision A (June 2014) to Revision B

Page

•

moved storage temperature range to Abs Max table ............................................................................................................ 4

•

Changed Handling Ratings table to ESD Ratings table ........................................................................................................ 4

•

Updated Thermal Information table ....................................................................................................................................... 4

•

Changed word "safety" to "fault detection" ........................................................................................................................... 11

•

Deleted "to 25% of the brightness range" ........................................................................................................................... 16

•

Changed PGEN register table and descriptions .................................................................................................................. 28

•

Changed fixed typo "2.4.4 kHz" to "24.4 kHz" ..................................................................................................................... 28

•

Added note to beginning of Application and Implementation section .................................................................................. 31

•

Added Community Resources section ................................................................................................................................ 43

Changes from Original (December 2013) to Revision A

Page

•

Changed formatting to match new TI datasheet guidelines; added Device Information and Handling Ratings table,

Layout, and Device and Documentation Support sections; reformatted Detailed Description and Application and

Implementation sections, fix typographical errors. ................................................................................................................ 1

•

Changed 6 LED strings to 5 LED Strings to correct typo ....................................................................................................... 8

•

Added PWM Input Duty Measurement subsection............................................................................................................... 13

•

Changed description for "0" BFSET as well as description of register table for BFSET bit ................................................ 29

2

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