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参数资料
| 型号： | MAX1578-MAX1579 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Complete Bias and White LED Power Supplies for Small TFT Displays |
| 中文描述： | 完整的偏置和白光LED电源的小型液晶显示器 |
| 文件页数： | 1/13页 |
| 文件大小： | 221K |
| 代理商： | MAX1578-MAX1579 |
General Desc ription
The MAX1578/MAX1579 provide four regulated outputs
to meet all the voltage requirements for small active-
matrix TFT-LCD displays in handheld devices where
minimum external components and high efficiency are
required. Each device consists of three advanced
charge pumps for LCD bias power and a step-up con-
verter for driving up to 8 series white LEDs for back-
lighting. The input voltage range is from 2.7V to 5.5V.
The charge pumps provide fixed +5V, +15V, and -10V
for the LCD bias circuits. No external diodes are need-
ed. A high-efficiency, fractional (1.5x/2x) charge pump
followed by a low-dropout linear regulator provides +5V
to power the source driver. Automatic mode changing
achieves the highest conversion efficiency. Two multi-
stage, high-voltage charge pumps generate +15V and
-10V to provide V
ON
and V
OFF
, respectively. Utilizing a
unique clocking scheme and internal drivers, these
charge pumps eliminate parasitic charge-current glitch-
es and reduce maximum input current, resulting in low
electromagnetic emissions. The outputs are sequenced
during startup and shutdown. In shutdown, the outputs
are discharged to zero.
The high-efficiency inductor step-up converter drives
up to 8 white LEDs in series with a constant current to
provide backlighting. The series connection allows the
LED currents to be identical for uniform brightness and
minimizes the number of traces to the LEDs. The
MAX1578 regulates constant LED current over the
entire temperature range. The MAX1579 features a tem-
perature derating function to avoid overdriving the
white LEDs during high ambient temperatures, enabling
higher drive current below +42
°
C.
The MAX1578/MAX1579 are available in space-saving
24-lead 4mm x 4mm thin QFN packages.
Applic ations
PDAs, Palmtops
Smart Phones
Internet Appliances
LCD Displays with White LED Backlight
Ordering Information
Features
Four Regulators in One Package
Bias Power Using Charge Pumps
+5V at 25mA for Source Driver
+15V at 100μA for V
ON
-10V at 100μA for V
OFF
No External Diodes Required
Output Sequencing
POS, NEG, and MAIN Are Autodischarged
During Shutdown
LED Backlight Power Using Boost Converter
Series LED Connection for Uniform Illumination
Supports Up to 8 LEDs at 25mA (max)
900mW (max) Power
PWM or Analog Dimming Control
Overvoltage Protection
Low Input/Output Ripple
Soft-Start with Zero Inrush Current
Fast 1MHz PWM Operation for Small
Component Size
Temperature Derating Function (MAX1579)
High Efficiency
Bias: 83% (5.0V at 25mA, 15V/-10V at 100μA)
LED: 84% (6 LEDs at 20mA)
Uses Only Ceramic Capacitors and Only One
Inductor
Independent Enable Inputs for LED and Bias
Power
Thermal-Shutdown Protection
1μA Shutdown Current
Tiny 4mm x 4mm Thin QFN Package
M
Complete Bias and White LED Power S upplies
for S mall T FT Displays
________________________________________________________________
Maxim Integrated Products
For pricing delivery, and ordering information please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1
19-3359; Rev 0; 8/04
EVALUATION KIT
AVAILABLE
PART
TEMP RANGE
PIN-PACKAGE
MAX1578
ETG
-40
°
C to +85
°
C
24 Thin QFN 4mm x 4mm
(T2444-4)
MAX1579
ETG
-40
°
C to +85
°
C
24 Thin QFN 4mm x 4mm
(T2444-4)
See Figure 3 for Typical Application Circuit.
ONBIAS
CD2
GND
NEG
PMPB
CD1
L
C
P
O
C
C
C
C
M
C
P
P
19
20
21
22
23
24
1
2
3
4
5
6
18
17
16
15
14
13
12
11
10
9
8
7
MAX1578
MAX1579
THIN QFN
4mm x 4mm
C2N
C2P
C1N
IN
V
DD
C1P
Pin Configuration
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1579ETG | 功能描述:LED照明驱动器 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 |
| MAX1579ETG+ | 功能描述:LED照明驱动器 Cmplete Bias & White LED Power Supply 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 |
| MAX1579ETG+T | 功能描述:LED照明驱动器 Cmplete Bias & White LED Power Supply 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 |
| MAX1579ETG-T | 功能描述:LED照明驱动器 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 |
| MAX1579EVKIT | 功能描述:LED 照明开发工具 Evaluation Kit for the MAX1579 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: |
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