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MAX8790AETP+T

更新时间： 2024-11-11 20:00:51
品牌 Logo 应用领域
美信 - MAXIM 驱动接口集成电路
页数 文件大小 规格书
22页 1559K
描述
LED Driver,

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中文翻译

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MAX8790AETP+T 技术参数

是否无铅： 不含铅是否Rohs认证： 符合
生命周期：Not Recommended包装说明：,
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01Factory Lead Time：6 weeks
风险等级：5.72接口集成电路类型：LED DISPLAY DRIVER
湿度敏感等级：1峰值回流温度（摄氏度）：NOT SPECIFIED
处于峰值回流温度下的最长时间：NOT SPECIFIEDBase Number Matches：1

MAX8790AETP+T 数据手册

 浏览型号MAX8790AETP+T的Datasheet PDF文件第2页浏览型号MAX8790AETP+T的Datasheet PDF文件第3页浏览型号MAX8790AETP+T的Datasheet PDF文件第4页浏览型号MAX8790AETP+T的Datasheet PDF文件第5页浏览型号MAX8790AETP+T的Datasheet PDF文件第6页浏览型号MAX8790AETP+T的Datasheet PDF文件第7页 
EVALUATION KIT AVAILABLE  
MAX8790A  
Six-String White LED Driver with Active  
Current Balancing for LCD Panel Applications  
General Description  
Features  
The MAX8790A is a high-efficiency driver for white light-  
emitting diodes (LEDs). It is designed for large liquidcrys-  
tal displays (LCDs) that employ an array of LEDs as the  
light source. A current-mode step-up controller drives up  
to six parallel strings of multiple series-connected LEDs.  
Each string is terminated with ballast that achieves ±1.5%  
current regulation accuracy, ensuring even brightness for  
all LEDs. The MAX8790A has a wide input-voltage range  
from 4.5V to 26V, and provides a fixed 20mA or adjustable  
15mA to 27mA full-scale LED current.  
● Drives Six Parallel Strings with Multiple Series-  
Connected LEDs per String  
● ±1.5% Current Regulation Accuracy Between Strings  
● Low 450mV Feedback Voltage at Full Current  
Improves Efficiency  
● Step-Up Controller Regulates the Output Just Above  
the Highest LED String Voltage  
● Full-Scale LED Current Adjustable from 15mA to  
27mA, or Preset 20mA  
● Wide 100:1 Dimming Range  
The MAX8790A has two dimming control modes to enable  
a wide variety of applications. In direct DPWM mode, the  
LED current is directly turned on and off by a PWM signal.  
In analog dimming mode, an internal phase-locked loop  
(PLL) circuit translates the PWM signal into an analog sig-  
nal and linearly controls the LED current down to 12.5%.  
Below 12.5%, digital dimming is added to allow lower  
average LED current down to 1%. Both control methods  
provide 100:1 dimming range.  
●
Programmable Dimming Control: Direct DPWM or  
Analog Dimming  
● Built-In PLL for Synchronized Dimming Control  
● Open and Short LED Protections  
● Output Overvoltage Protection  
● Wide Input Voltage Range from 4.5V to 26V  
● External MOSFET Allows a Large Number of LEDs  
The MAX8790A has multiple features to protect the con-  
troller from fault conditions. Separate feedback loops limit  
the output voltage if one or more LEDs fail open or short.  
The controller features cycle-by-cycle current limit to pro-  
vide consistent operation and soft-start capability. A ther-  
mal-shutdown circuit provides another level of protection.  
per String  
● 500kHz/750kHz/1MHz Switching Frequency  
● Small, 20-Pin, 4mm x 4mm Thin QFN Package  
Simplified Operating Circuit  
L1  
D1  
V
OUT  
The step-up controller uses an external MOSFET, which  
provides good efficiency and allows for scalable output  
power and maximum operating voltage. Low feedback  
voltage at each LED string (450mV) helps reduce power  
loss. The MAX8790A features selectable switching fre-  
quency (500kHz, 750kHz, or 1MHz), which allows trade-offs  
between external component size and ope-rating efficiency.  
V
IN  
C
IN  
0.1µF  
IN  
SHDN  
N1  
EXT  
CS  
V
CC  
FSET  
ISET  
R
S
The MAX8790A is available in a thermally enhanced,  
lead-free, 20-pin, 4mm x 4mm, thin QFN package.  
MAX8790A  
GND  
BRT  
Applications  
● Notebook, Subnotebook, and Tablet Computer  
Displays  
● Handy Terminals  
R1  
OV  
N.C.  
N.C.  
OSC  
CPLL  
CCV  
R2  
FB1  
FB2  
FB3  
FB4  
FB5  
FB6  
Ordering Information  
ENA  
EP  
PART  
TEMP RANGE  
PIN-PACKAGE  
MAX8790AETP+  
-40°C to +85°C  
20 TQFN-EP*  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
*EP = Exposed pad.  
Pin Configuration appears at end of data sheet.  
19-0989; Rev 1; 10/14  
1234567...22

中文翻译

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MAX8790AETP+T 替代型号

型号 品牌 替代类型 描述 数据表
MAX8790AETP+ MAXIM

类似代替

 LED Driver, 6-Segment, BICMOS, PQCC20, 4 X 4 MM, 0.80 MM HEIGHT, LEAD FREE, MO-220WGGD-1,

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