Datasheet > MAX1579

MAX1579

更新时间： 2024-09-15 14:57:19

品牌	Logo	应用领域
亚德诺 - ADI		显示器
页数	文件大小	规格书
13页	259K
描述
可提供完备偏置的白光LED电源，用于TFT显示器

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数据手册

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MAX1579 数据手册

19-3359; Rev 1; 8/05

Complete Bias and White LED Power Supplies

for Small TFT Displays

General Description

Features

♦ Four Regulators in One Package

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.

♦ Bias Power Using Charge Pumps

+5V at 25mA for Source Driver

+15V at 100µA for V

-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

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

PWM or Analog Dimming Control

Overvoltage Protection

Low Input/Output Ripple

-10V to provide V

and V , respectively. Utilizing a

OFF

Soft-Start with Zero Inrush Current

Fast 1MHz PWM Operation for Small

Component Size

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.

Temperature Derating Function (MAX1579)

♦ High Efficiency

Bias: 83% (5.0V at 25mA, 15V/-10V at 100µA)

LED: 84% (6 LEDs at 20mA)

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.

♦ 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

The MAX1578/MAX1579 are available in space-saving

24-lead 4mm x 4mm thin QFN packages.

18 17 16 15 14 13

Applications

PDAs, Palmtops

Smart Phones

LCD Displays with

White LED Backlight

C1N 19

GND

ONBIAS

NEG

C2N

Internet Appliances

CD2

MAX1578

MAX1579

C2P

Ordering Information

CD1

C1P 23

PART

TEMP RANGE PIN-PACKAGE

24 Thin QFN 4mm x 4mm

PMPB

MAX1578ETG

-40°C to +85°C

(T2444-4)

24 Thin QFN 4mm x 4mm

(T2444-4)

MAX1578ETG+ -40°C to +85°C

+ Denotes lead-free package.

THIN QFN

4mm x 4mm

See Figure 3 for Typical Application Circuit.

Ordering Information continued at end of data sheet.

________________________________________________________________ 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.

12 3 4 5 6 7...13

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与MAX1579相关器件

型号	品牌	获取价格	描述	数据表
MAX1579ETG	MAXIM	获取价格	Complete Bias and White LED Power Supplies for Small TFT Displays
MAX1579ETG	ROCHESTER	获取价格	LED DISPLAY DRIVER, QCC24, 4 X 4 MM, 0.80 MM HEIGHT, MO-220WGGD-2, TQFN-24
MAX1579ETG+	MAXIM	获取价格	LED Driver, 1-Segment, BICMOS, 4 X 4 MM, 0.80 MM HEIGHT, LEAD FREE, MO-220WGGD-2, TQFN-24
MAX157ACPA	MAXIM	获取价格	+2.7V, Low-Power, 2-Channel, 108ksps, Serial 10-Bit ADCs in 8-Pin ?MAX
MAX157ACUA	MAXIM	获取价格	+2.7V, Low-Power, 2-Channel, 108ksps, Serial 10-Bit ADCs in 8-Pin ?MAX
MAX157AEPA	MAXIM	获取价格	+2.7V, Low-Power, 2-Channel, 108ksps, Serial 10-Bit ADCs in 8-Pin ?MAX
MAX157AEPA+	MAXIM	获取价格	ADC, Successive Approximation, 10-Bit, 1 Func, 2 Channel, Serial Access, CMOS, PDIP8, 0.30
MAX157AEUA	MAXIM	获取价格	+2.7V, Low-Power, 2-Channel, 108ksps, Serial 10-Bit ADCs in 8-Pin ?MAX
MAX157AEUA+	MAXIM	获取价格	ADC, Successive Approximation, 10-Bit, 1 Func, 2 Channel, Serial Access, CMOS, PDSO8, M0-1
MAX157AEUA+T	MAXIM	获取价格	ADC, Successive Approximation, 10-Bit, 1 Func, 2 Channel, Serial Access, CMOS, PDSO8, M0-1

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