MAX1986ETE+T【PDF 1/17 页】IC LED DRVR WHITE BCKLGT 16-TQFN

收藏本站

您好，
买卖IC网欢迎您。
请登录
免费注册

买卖IC网

Sheet目录340

[1页]2页 3页 4页 5页

19-2761; Rev 0; 1/03

ATION

EVALU

AVAIL

KIT

ABLE

Ultra-High-Efficiency White

LED Drivers

General Description

The MAX1984/MAX1985/MAX1986 are white light-emit-

ting diode (LED) drivers that use individual regulators to

control the current of up to eight LEDs. A high-efficiency

step-up regulator generates just enough voltage to keep

all the current regulators in regulation. A versatile dim-

ming interface accommodates analog, digitally adjusted

Features

o Synchronous Step-Up Regulator

Achieves >95% Efficiency

Internal Switch and Synchronous Rectifier

Eliminates External MOSFETs and Diodes

1MHz Fixed Frequency Minimizes Component

Sizes

pulse-width modulation (DPWM), or parallel control.

Up to 90% Total LED Efficiency

The individual current regulators allow good current

matching between LEDs. Open or shorted LEDs cannot

affect the performance of other LEDs.

The step-up regulator achieves high efficiency by using

synchronous rectification. The internal N-channel switch

and P-channel synchronous rectifier eliminate the need

for external MOSFETs and diodes. The 1MHz switching

frequency allows the use of low-profile inductors and

ceramic capacitors.

The brightness can be easily adjusted using a multi-

mode dimming interface, which allows brightness control

through a DPWM signal, a 2- or 3-bit parallel control

interface, or an analog signal. The DPWM signal can be

connected directly to the control pin without the need for

an external RC filter if its frequency is 10kHz or above.

The MAX1984 drives up to eight LEDs, the MAX1985

drives up to six LEDs, and the MAX1986 drives up to

four LEDs. Each device has an LED select pin (SEL)

o Accurate LED Current Matching (8% max)

o Adjustable Maximum LED Current

o Multimode Dimming Control

Digital Pulse-Width Modulation Control

2-Bit Parallel Control

3-Bit Parallel Control

Analog Control

o Selectively Enable LEDs

o Open-LED Detection

o Unique 0.5mA LED Test Mode

o 2.7V to 5.5V Input Supply Range

o Small 4mm x 4mm 20-Pin Thin QFN Package

Ordering Information

that allows one subset, the other subset, or all LEDs to

be illuminated. All three devices are available in a

4mm ? 4mm thin QFN package.

Applications

PDAs and Hand-Held PCs

PART

MAX1984 ETP

MAX1985 ETP

MAX1986 ETE

TEMP RANGE

-40°C to +85°C

PIN-PACKAGE

20 Thin QFN

16 Thin QFN

NO. OF

LEDs

Cellular Phones

Digital Cameras

Pin Configurations

TOP VIEW

OUT 1

15 BITB

OUT 1

15 BITB

LX 2

14 REF

LX 2

14 REF

OUT 1

12 BITA

GND 3

MAX1984

13 SETI

GND 3

MAX1985

13 SETI

LX 2

MAX1986

11 BITB

LD1 4

LD2 5

12 LD8

11 LD7

N.C. 4

LD1 5

12 N.C.

11 LD6

GND 3

LD1 4

10 REF

9 SETI

4mm x 4mm

THIN QFN

4mm x 4mm

THIN QFN

4mm x 4mm

THIN QFN

________________________________________________________________ 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.

发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

*型号	*数量	厂商	批号	封装

添加更多采购

采购需求

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

我的联系方式