Datasheet > MIC3289

MIC3289

更新时间： 2024-11-21 14:54:43

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
15页	613K
描述
The MIC3289 is a PWM boost-switching regulator that is optimized for constant-current white LED dr

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MIC3289 数据手册

MIC3289

1.2MHz PWM White LED Driver with

Internal Schottky Diode and True 1-Wire

Digital Control

General Description

Features

The MIC3289 is a PWM boost-switching regulator that is

optimized for constant-current white LED driver

applications. The MIC3289 features an internal Schottky

diode, allowing an efficient DC/DC solution that requires

only 4 external components.

• Single wire combines 16 level logarithmic brightness &

shutdown control

• 16V / 24V OVP options supports up to 4 & 6 WLEDs

• Start-up in any one of 16 brightness levels

• Internal Schottky diode

• 2.5V to 6.5V input voltage

• 1.2 MHz PWM operation

The MIC3289 allows for a single wire simple digital

interface to control the dimming over 16 steps with a log

scale to give better resolution at the lower currents and to

better match the sensitivity of the human eye. The pre-

programming feature allows the user to select any one of

the 16 WLED current levels as the start-up brightness

level.

• Over 500mA switch current

• 250mV reference voltage

•

5% LED current accuracy

• <1µA shutdown current

• Over temperature protection

• UVLO

The feedback voltage of the MIC3289 is only 250mV,

allowing high efficiency while retaining excellent accuracy

for the white LED current.

The MIC3289 implements a constant frequency 1.2MHz

PWM control scheme. The high frequency PWM operation

saves board space by reducing external component sizes.

The 1.2MHz PWM scheme also reduces switching noise

and ripple to the input power source.

• Thin SOT23-6L package option

• 2mm × 2mm leadless MLF^®-8L package option

• –40^oC to +125^oC junction temperature range

The 2.5V to 6.5V input voltage range of MIC3289 allows

direct operation from single cell Li Ion as well as 3- to 4-

Applications

• White/Blue LED driver for backlighting

cell NiCad/NiMH/Alkaline batteries.

Battery life is

preserved with a low 1µA shutdown current.

Cell phones

PDAs

GPS systems

Digital cameras

Multimedia / MP3 players

The MIC3289 is available in a low profile Thin SOT23 6-

lead package and a 2mm × 2mm MLF^®-8L package and

has a junction temperature range of –40°C to +125°C.

Data sheets and support documentation can be found on

Micrel’s web site at www.micrel.com.

• LED flashlights

• Constant current power supplies

___________________________________________________________________________________________________________

MicroLead Frame and MLF are registered trademarks of Amkor Technologies.

Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

M9999-061807

(408) 944-0800

June 2007

12 3 4 5 6 7...15

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与MIC3289相关器件

型号	品牌	获取价格	描述	数据表
MIC3289_0706	MICREL	获取价格	1.2MHz PWM White LED Driver with Internal Schottky Diode and True 1-Wire Digital Control
MIC3289-16YD6	MICREL	获取价格	1.2MHz PWM White LED Driver with Internal Schottky Diode and True 1-Wire Digital Control
MIC3289-16YML	MICREL	获取价格	1.2MHz PWM White LED Driver with Internal Schottky Diode and True 1-Wire Digital Control
MIC3289-16YMLTR	MICROCHIP	获取价格	LED DISPLAY DRIVER, DSO8, 2 X 2 MM, MLF-8
MIC3289-16YML-TR	MICROCHIP	获取价格	LED DISPLAY DRIVER, DSO8
MIC328924YD6	MICROCHIP	获取价格	LED DISPLAY DRIVER, PDSO6
MIC3289-24YD6	MICREL	获取价格	1.2MHz PWM White LED Driver with Internal Schottky Diode and True 1-Wire Digital Control
MIC328924YML	MICROCHIP	获取价格	LED DISPLAY DRIVER, DSO8
MIC3289-24YML	MICREL	获取价格	1.2MHz PWM White LED Driver with Internal Schottky Diode and True 1-Wire Digital Control
MIC3289-24YMLTR	MICROCHIP	获取价格	LED DISPLAY DRIVER, DSO8, 2 X 2 MM, MLF-8

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