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| 型号： | MAX8790AETP+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 1/23页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 20-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 6 |
| 内部驱动器： | 无 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1MHz |
| 电源电压： | 4.5 V ~ 5.5 V，5.5 V ~ 26 V |
| 输出电压： | 5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WFQFN 裸露焊盘 |
| 供应商设备封装： | 20-TQFN-EP |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 85°C |
ATION
EVALU
AVAIL
19-0989; Rev 0; 10/07
KIT
ABLE
Six-String White LED Driver with Active
Current Balancing for LCD Panel Applications
General Description
The MAX8790A is a high-efficiency driver for white light-
emitting diodes (LEDs). It is designed for large liquid-
crystal 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 bright-
ness for all LEDs. The MAX8790A has a wide input-volt-
age range from 4.5V to 26V, and provides a fixed 20mA
or adjustable 15mA to 27mA full-scale LED current.
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 sig-
nal into an analog signal 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.
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.
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
Features
o Drives Six Parallel Strings with Multiple Series-
Connected LEDs per String
o ±1.5% Current Regulation Accuracy Between
Strings
o Low 450mV Feedback Voltage at Full Current
Improves Efficiency
o Step-Up Controller Regulates the Output Just
Above the Highest LED String Voltage
o Full-Scale LED Current Adjustable from 15mA to
27mA, or Preset 20mA
o Wide 100:1 Dimming Range
o Programmable Dimming Control: Direct DPWM or
Analog Dimming
o Built-In PLL for Synchronized Dimming Control
o Open and Short LED Protections
o Output Overvoltage Protection
o Wide Input Voltage Range from 4.5V to 26V
o External MOSFET Allows a Large Number of LEDs
per String
o 500kHz/750kHz/1MHz Switching Frequency
o Small, 20-Pin, 4mm x 4mm Thin QFN Package
Simplified Operating Circuit
power loss. The MAX8790A features selectable switch-
V IN
L1
D1
V OUT
ing frequency (500kHz, 750kHz, or 1MHz), which
allows trade-offs between external component size and
ope-rating efficiency.
C IN
0.1 μ F
The MAX8790A is available in a thermally enhanced,
SHDN
IN
EXT
N1
lead-free, 20-pin, 4mm x 4mm, Thin QFN package.
Applications
Notebook, Subnotebook, and Tablet Computer
Displays
V CC
FSET
ISET
MAX8790A
BRT
CS
GND
Rs
R1
Automotive Systems
Handy Terminals
N.C.
N.C.
OSC
CPLL
OV
R2
CCV
Ordering Information
FB1
FB2
PART
TEMP RANGE PIN-PACKAGE
PKG
CODE
ENA
EP
FB3
FB4
FB5
FB6
MAX8790AETP+ -40°C to +85°C
+Denotes a lead-free package.
20 Thin QFN
(4mm x 4mm)
T2044-3
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8790AETP+ | 功能描述:LED照明驱动器 Six-String White LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX8790AETP+T | 功能描述:LED照明驱动器 Six-String White LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX8790AETP+X01 | 功能描述:LED照明驱动器 Six-String White LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX8790AEVKIT+ | 功能描述:LED 照明开发工具 MAX8790A Eval Kit RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| MAX8790ETP+ | 功能描述:LED照明驱动器 Six-String White LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
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