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MC34844EP/R2 PDF预览

MC34844EP/R2

更新时间: 2024-11-10 11:09:03
品牌 Logo 应用领域
飞思卡尔 - FREESCALE 驱动器接口集成电路
页数 文件大小 规格书
37页 2140K
描述
10 Channel LED Backlight Driver with Integrated Power Supply

MC34844EP/R2 数据手册

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Document Number: MC34844  
Rev. 5.0, 5/2009  
Freescale Semiconductor  
Advance Information  
10 Channel LED Backlight Driver  
with Integrated Power Supply  
34844  
The 34844 is a high efficiency, LED driver for use in backlighting  
LCD displays from 10" to 20"+. Operating from supplies of 7.0 to 28 V,  
the MC34844 is capable of driving up to 160 LEDs in 10 parallel  
strings. Current in the 10 strings is matched to within 2%, and can be  
programmed via the I2C/SM Bus interface.  
LED DRIVER  
The 34844 also includes a Pulse Width Monitor (PWM) generator  
for LED dimming. The LEDs can be dimmed to one of 256 levels,  
programmed through the I2C/SM Bus interface. Up to 65,000:1 (256:1  
PWM, 256:1 Current DAC) dimming ratio.  
The integrated boost converter generates the minimum output  
voltage required to keep all LEDs illuminated with the selected current,  
providing the highest efficiency possible. The integrated boost self-  
clocks at a default frequency of 600 kHz, but may be programmed via  
I2C to 150/300/600/1200 kHz. The PWM frequency can be set from  
100 Hz to 25 kHz, or can be synchronized to an external input. If not  
synchronized to another source, the internal PWM rate outputs on the  
CK pin. This enables multiple devices to be synchronized together.  
EP SUFFIX (PB-FREE)  
98ASA10800D  
32-PIN QFN-EP  
The 34844 also supports optical/temperature closed loop operation  
and also features LED over-temperature protection, LED short  
protection, and LED open circuit protection. The IC also includes over-  
voltage protection, over-current protection, and under-voltage lockout.  
ORDERING INFORMATION  
Temperature  
Package  
Features  
Device  
Range (T )  
A
• Input voltage of 7.0 to 28 V  
MC34844EP/R2  
-40°C to 105°C  
32 QFN-EP  
• Boost output voltage up to 60 V, with Dynamic  
Headroom Control (DHC)  
• 3.0 A integrated boost FET  
Applications  
• Up to 50 mA LED current per channel  
• 90% efficiency (DC:DC)  
• 10 channel current mirror with ±2% current matching  
• I2C/SM Bus interface  
• Monitors - up to 27 inch  
• Personal Computer Notebooks  
• GPS Screens  
• Small screen Televisions  
• PWM frequency programmable or synchronizable from  
100 to 25,000Hz  
• 32-Ld 5x5x1.0 mm TQFN Package  
• Pb-free packaging designated by suffix code EP  
34844  
7.0 to 28V  
VIN  
SWA  
SWB  
VDC1  
VDC2  
VDC3  
VOUT  
PGNDA  
PGNDB  
COMP  
VCC  
SLOPE  
FAIL  
SCK  
SDA  
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
Control Unit  
VDC1  
VDC1  
I0  
I1  
I2  
I3  
I4  
I5  
I6  
I7  
I8  
I9  
PWM  
A0/SEN  
CK  
M/~S  
EN  
ISET  
VDC1  
PIN  
NIN  
GND  
Figure 1. Simplified Application Diagram (SM Bus Mode)  
* This document contains certain information on a new product.  
Specifications and information herein are subject to change without notice.  
© Freescale Semiconductor, Inc., 2009. All rights reserved.  

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