2
LM3644
,
LM3644TT
ZHCSCQ8D –AUGUST 2014 –REVISED SEPTEMBER 2015
www.ti.com.cn
Copyright © 2014–2015, Texas Instruments Incorporated
目目录录
1 特特性性.......................................................................... 1
2 应应用用.......................................................................... 1
3 说说明明.......................................................................... 1
4 修修订订历历史史记记录录 ........................................................... 2
5 Device Comparison Table..................................... 2
6 Pin Configuration and Functions......................... 3
7 Specifications......................................................... 4
7.1 Absolute Maximum Ratings ...................................... 4
7.2 ESD Ratings ............................................................ 4
7.3 Recommended Operating Conditions....................... 4
7.4 Thermal Information.................................................. 4
7.5 Electrical Characteristics........................................... 5
7.6 Timing Requirements ............................................... 6
7.7 Switching Characteristics.......................................... 6
7.8 Typical Characteristics.............................................. 6
8 Detailed Description............................................ 12
8.1 Overview ................................................................. 12
8.2 Functional Block Diagram ...................................... 13
8.3 Feature Description ................................................ 13
8.4 Device Functioning Modes...................................... 15
8.5 Programming........................................................... 19
8.6 Register Descriptions.............................................. 21
9 Applications and Implementation ...................... 25
9.1 Application Information............................................ 25
9.2 Typical Application ................................................. 25
10 Power Supply Recommendations ..................... 31
11 Layout................................................................... 31
11.1 Layout Guidelines ................................................. 31
11.2 Layout Example ................................................... 32
12 器器件件和和文文档档支支持持 ..................................................... 33
12.1 器件支持................................................................ 33
12.2 相关文档................................................................ 33
12.3 商标 ....................................................................... 33
12.4 静电放电警告......................................................... 33
12.5 术语表 ................................................................... 33
13 机机械械、、封封装装和和可可订订购购信信息息....................................... 33
4 修修订订历历史史记记录录
Changes from Revision C (April 2015) to Revision D Page
• Changed 0x00 to 0x02 - typo ............................................................................................................................................... 21
• Changed 0x40 to 0x04 - typo ............................................................................................................................................... 21
Changes from Revision B (November 2014) to Revision C Page
• 已添加 有关 LM3644TT 选项的信息 ....................................................................................................................................... 1
• Changed Handling Ratings to ESD Ratings; moved storage temp to Ab Max ..................................................................... 4
• Added full Thermal Information information .......................................................................................................................... 4
Changes from Revision A (October 2013) to Revision B Page
• Changed '011' to '000' - typo ................................................................................................................................................ 24
Changes from Original (August 2014) to Revision A Page
• 已更改 标题“具有高侧电流源的 1.5A 同步升压白色 LED 驱动器”至“双路 1.5A 电流源摄像头闪光灯 LED 驱动器” ............... 1
• Added Note to beginning of Applications and Implementations section .............................................................................. 25
5 Device Comparison Table
ORDERING PART NUMBER MAXIMUM TORCH CURRENT
PER CHANNEL
FLASH TIME-OUT RANGE
LM3644YFFR 179 mA 10 ms to 400 ms
LM3644TTYFFR 360 mA 40 ms to 1600 ms