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LM3648, LM3648TT

SNVSA68D – OCTOBER 2014 – REVISED NOVEMBER 2016

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Product Folder Links: LM3648 LM3648TT

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Copyright © 2014–2016, Texas Instruments Incorporated

Table of Contents

1

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

2

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

3

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

4

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

5

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

6

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

6.1

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

6.2

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

6.3

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

6.4

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

6.5

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

6.6

Timing Requirements ............................................... 5

6.7

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

6.8

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

7

Detailed Description ............................................ 10

7.1

Overview ................................................................. 10

7.2

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

7.3

Feature Description ................................................ 11

7.4

Device Functioning Modes...................................... 13

7.5

Programming........................................................... 16

7.6

Register Descriptions .............................................. 18

8

Applications and Implementation ...................... 22

8.1

Application Information............................................ 22

8.2

Typical Application ................................................. 22

9

Power Supply Recommendations ...................... 27

10

Layout................................................................... 27

10.1

Layout Guidelines ................................................. 27

10.2

Layout Example ................................................... 28

11

Device and Documentation Support ................. 29

11.1

Device Support...................................................... 29

11.2

Documentation Support ........................................ 29

11.3

Receiving Notification of Documentation Updates 29

11.4

Community Resources.......................................... 29

11.5

Trademarks ........................................................... 29

11.6

Electrostatic Discharge Caution ............................ 29

11.7

Glossary ................................................................ 30

12

Mechanical, Packaging, and Orderable

Information ........................................................... 30

4 Revision History

NOTE: Page numbers for previous revisions may differ from page numbers in the current version.

Changes from Revision C (September 2016) to Revision D

Page

•

Changed "(Default)" from "011111 = 748.75 mA" to "111111 = 1.5 A" in LED Flash Brightness Register ......................... 19

Changes from Revision B (September 2015) to Revision C

Page

•

Added several additional Applications ................................................................................................................................... 1

Changes from Revision A (August 2015) to Revision B

Page

•

Added "or 0x04 for LM3648TT" to Device ID Register row, Register Descriptions table..................................................... 18

•

Changed "'011'" to "'000'" in Device Register Bits 5-3 description ....................................................................................... 21

Changes from Original (October 2014) to Revision A

Page

•

Added Torch Currents up to 500 mA (LM3648TT)................................................................................................................. 1

•

Added Flash Timeout Values up to 1.6 seconds (LM3648TT) .............................................................................................. 1

•

Changed Handling Ratings to ESD Ratings; moved storage temperature to Abs Max ......................................................... 4

•

Added ILED row for LM3648TT option .................................................................................................................................... 5

•

Added VHR row for LM3648TT option .................................................................................................................................... 5

•

Added several new graphs related to LM3648TT option performance ................................................................................. 5

•

Added to 1.6 s on LM3648TT in Flash Time-Out ................................................................................................................. 15

•

Added new eq. and LM3648TT values in LED Torch Brightness Reg.; added NOTE below LED Torch Brightness

Reg. description ................................................................................................................................................................... 19

•

Added LM3648TT values for Timing Config. Reg.; added NOTE below Timing Config. Reg. description ......................... 20

•

Added "or '100'" for LM3648TT in Device ID Register Bits 2-0 description ......................................................................... 21

•

Added Application curves for LM3648TT performance ....................................................................................................... 24