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MC34844AEP

更新时间： 2024-11-09 17:01:23
品牌 Logo 应用领域
恩智浦 - NXP /
页数 文件大小 规格书
37页 1842K
描述
LED Backlight Driver, 10 Channel with Integrated Power Supply, QFN 32

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MC34844AEP 技术参数

是否无铅：不含铅是否Rohs认证：符合
生命周期：Transferred零件包装代码：QFN
包装说明：5 X 5 MM, 1 MM HEIGHT, ROHS COMPLIANT, TQFN-32针数：32
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：7.88
Samacsys Confidence：Samacsys Status：Released
Samacsys PartID：582448Samacsys Pin Count：33
Samacsys Part Category：Integrated CircuitSamacsys Package Category：Other
Samacsys Footprint Name：QFN50P500X500X100-33NSamacsys Released Date：2017-01-11 16:45:57
Is Samacsys：N数据输入模式：SERIAL
接口集成电路类型：LED DISPLAY DRIVERJESD-30 代码：S-XQCC-N32
长度：5 mm湿度敏感等级：3
复用显示功能：YES功能数量：1
区段数：10端子数量：32
最高工作温度：105 °C最低工作温度：-40 °C
封装主体材料：UNSPECIFIED封装代码：HVQCCN
封装等效代码：LCC32,.2SQ,20封装形状：SQUARE
封装形式：CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE峰值回流温度（摄氏度）：260
电源：12 V认证状态：Not Qualified
座面最大高度：1 mm子类别：Display Drivers
最大供电电压：28 V最小供电电压：7 V
标称供电电压：12 V表面贴装：YES
温度等级：INDUSTRIAL端子形式：NO LEAD
端子节距：0.5 mm端子位置：QUAD
处于峰值回流温度下的最长时间：40宽度：5 mm
最小 fmax：0.4 MHzBase Number Matches：1

MC34844AEP 数据手册

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Document Number: MC34844  
Rev. 10.0, 8/2014  
ale Semiconductor  
cal Data  
10 Channel LED Backlight Driver  
with Integrated Power Supply  
34844  
The 34844 is a SMARTMOS 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 34844 has an integrated boost self-clock 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  
Applications  
The 34844 has a default boost frequency of 320 kHz, but may be  
programmed via I2C to 160/320/650/1300 kHz. The PWM frequency can be set  
from 110 Hz to 27 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.  
• Monitors and HDTV - up to 42 inch  
• Personal Computer Notebooks  
• GPS Screens  
• Small screen Televisions  
The 34844 also supports optical/temperature closed loop operation and  
features LED overtemperature protection, LED short protection, and LED open  
circuit protection. The IC includes overvoltage protection, overcurrent  
protection, and undervoltage lockout.  
Features  
• Input voltage of 7.0 to 28 V  
• 2.5 A integrated boost FET  
• Up to 80 mA on the 34844 LED current per channel  
• 90% efficiency (DC:DC)  
• I2C/SM Bus interface  
• 10 channel current mirror with ±2.0% current matching  
• Boost output voltage up to 60V, with Dynamic Headroom Control (DHC)  
• PWM frequency programmable or synchronizable from 110 to 27,000 Hz  
• 32-Ld 5x5x1.0 mm TQFN Package  
© Freescale Semiconductor, Inc., 2009-2014. All rights reserved.  
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