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| 型号： | MAX1578ETG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/13页 |
| 文件大小： | 0K |
| 描述： | IC PS BIAS/WHITE LED TFT 24-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 75 |
| 应用： | LCD 显示器 |
| 电流 - 电源： | 3mA |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 包装： | 管件 |
ATION
EVALU
AVAILA
19-3359; Rev 1; 8/05
KIT
BLE
Complete Bias and White LED Power Supplies
for Small TFT Displays
General Description
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.
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
Pin Configuration
Applications
18
17
16
15
14
13
PDAs, Palmtops
Smart Phones
Internet Appliances
LCD Displays with
White LED Backlight
C1N 19
C2N 20
IN 21
12 GND
11 ONBIAS
10 NEG
Ordering Information
C2P 22
C1P 23
MAX1578
MAX1579
9
8
CD2
CD1
PART
TEMP RANGE
PIN-PACKAGE
V DD 24
+
7
PMPB
MAX1578 ETG
-40 ° C to +85 ° C
24 Thin QFN 4mm x 4mm
(T2444-4)
1
2
3
4
5
6
MAX1578ETG+
-40 ° C to +85 ° C
24 Thin QFN 4mm x 4mm
(T2444-4)
THIN QFN
+ Denotes lead-free package.
Ordering Information continued at end of data sheet.
4mm x 4mm
See Figure 3 for Typical Application Circuit.
________________________________________________________________ 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
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1578ETG+ | 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 |
| MAX1578ETG+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 |
| MAX1578ETG-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 | 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 |
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