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LM3639A

更新时间： 2024-11-04 12:30:23
品牌 Logo 应用领域
德州仪器 - TI 驱动器闪光灯
页数 文件大小 规格书
28页 518K
描述
LM3639A Single Chip 40V Backlight 1.5A Flash LED Driver

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LM3639A 数据手册

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LM3639A  
www.ti.com  
SNVS964 –MARCH 2013  
LM3639A Single Chip 40V Backlight + 1.5A Flash LED Driver  
Check for Samples: LM3639A  
1
FEATURES  
DESCRIPTION  
The LM3639A is a single-chip white LED Camera  
Flash Driver + LCD Display Backlight Driver. The low-  
2
•
Single Chip White LED Flash and Backlight  
Driver  
voltage, high-current flash LED driver is  
a
•
•
•
1.5A Flash LED Current  
synchronous boost which provides the power for a  
single flash LED at up to 1.5A or dual LEDs at up to  
750 mA each. The high-voltage backlight driver is a  
dual-output asynchronous boost which powers dual  
LED strings at up to 40V and 30 mA per string. An  
adaptive regulation method in both boost converters  
regulates the headroom voltage across the respective  
source/sink to ensure the LED current remains in  
Dual String Backlight Control (40V Max VOUT  
)
128 Level Exponential and Linear Brightness  
Control  
•
•
PWM Input for CABC  
Programmable Over-Voltage Protection  
(Backlight)  
regulation  
while  
maximizing  
efficiency.  
The  
•
•
•
Programmable Current Limit (Flash)  
Programmable Switching Frequency  
LM3639A's flash driver is a 2MHz or 4MHz fixed-  
frequency synchronous boost converter plus 1.5A  
constant current driver for a high-current white LED.  
The high-side current source allows for grounded  
cathode LED operation providing Flash current up to  
1.5A. An adaptive regulation method ensures the  
current source remains in regulation and maximizes  
efficiency.  
The device is controlled by an I2C-compatible  
interface. Features for the flash LED driver include a  
hardware flash enable (STROBE) allowing a logic  
input to trigger the flash pulse, and a TX input for  
synchronization to RF power amplifier events or other  
high current conditions. Features for the LCD  
backlight driver include a PWM input for content  
adjustable backlight control, 128 exponential or linear  
Optimized Flash Current During Low-Battery  
Conditions  
APPLICATIONS  
•
•
White LED Backlit Display Power  
White LED Camera Flash Power  
VOUTB  
up to 40V  
L(B)  
Schottky  
L(F)  
COUTB  
SWF SWB  
OVP  
OUTF  
OR  
VIN  
2.5V - 5.5V  
CIN  
COUTF  
brightness  
levels,  
programmable  
over-voltage  
EN  
protection, and selectable switching frequency (500  
kHz or 1 MHz).  
SCL  
SDA  
STROBE  
BLED1  
BLED2  
The device is available in a tiny 1.790 mm x 2.165  
mm x 0.6 mm 20-bump, 0.4 mm pitch DSBGA  
package and operates over the −40°C to +85°C  
temperature range.  
TX  
FLED1  
FLED2  
PWM  
FLED2  
FLED1  
GND  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
2
All trademarks are the property of their respective owners.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2013, Texas Instruments Incorporated  
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