Datasheet > MIC3287

MIC3287

更新时间： 2023-12-06 20:08:44

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
9页	333K
描述
The MIC3287 is a 1.2MHz pulse-width modulated (PWM) step-up switching regulator that is optimized

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MIC3287 数据手册

Micrel, Inc

MIC3287

1.2MHz PWM White LED Driver with OVP in

Thin SOT-23 and 2mm x 2mm MFL

General Description

Features

The MIC3287 is a 1.2MHz pulse width modulated (PWM)

step-up switching regulator that is optimized for constant cur-

rent white LED driving applications. With a switch current of

over 350mA, the MIC3287-24 drives a string of up to 4 white

LEDs in series, ensuring uniform brightness and eliminating

several ballast resistors.

• 2.8V to 6.5V Input Voltage

• 350mA Switch Current

• 1.2 MHz PWM Operation

• 250mV Feedback Voltage

• Optional 24V Output Over-Voltage Protection (OVP)

• Up to 36V Output Voltage without OVP

• <1% Line and Load Regulation

• <1µA Shutdown Current

TheMIC3287implementsaconstantfrequency1.2MHzPWM

current-mode control scheme. The high frequency PWM op-

eration saves board space by reducing external component

sizes. The added beneﬁt of the constant frequency PWM

control scheme as opposed to variable frequency control

schemes is much lower noise and input ripple injected back

to the battery source. To optimize efﬁciency, the feedback

voltage is set to only 250mV. The MIC3287 is also available

with a maximum 24V over-voltage protection.

• Over-Temperature Protection

• Under-Voltage Lock Out (UVLO)

• Low Proﬁle Thin SOT-23-5 Package Option

• Low Proﬁle Thin SOT-23-6 Package Option

• 8-pin 2mm x 2mm MLF Package Option

• –40°C to +125°C Junction Temperature Range

The MIC3287 is available in low proﬁle Thin SOT-23 5-pin

and Thin SOT-23 6-pin packages. The MIC3287 has a junc-

tion temperature range of –40°C to +125°C.

Applications

• White LED Driver for Backlighting:

- Cell phones

All support documentation can be found on Micrel’s web site

at: www.micrel.com.

- PDAs

- GPS systems

- Digital cameras

- MP3 players

- IP phones

• LED Flashlights

• Constant Current Power Supplies

Typical Application

10µH

MIC3287-24YD6

MIC3287YD5

VIN

1-Cell

Li Ion

1-Cell

Li Ion

1µF

OVP

0.22µF

250mV

GND

4-Series White LED Driver

3-Series White LED Driver in Thin SOT-23-5

with Output OVP in Thin SOT-23-6

MLF and MicroLeadFrame are registered trademarks of Amkor Technology, Inc.

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

April 2010

M9999-042910

12 3 4 5 6 7...9

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与MIC3287相关器件

型号	品牌	描述	获取价格	数据表
MIC3287_10	MICREL	1.2MHz PWM White LED Driver with OVP in Thin SOT-23 and 2mm x 2mm MFL	获取价格
MIC3287-24YD6	MICREL	1.2MHz PWM White LED Driver with OVP in Thin SOT-23 and 2mm x 2mm MFL	获取价格
MIC3287-24YML	MICREL	1.2MHz PWM White LED Driver with OVP in Thin SOT-23 and 2mm x 2mm MFL	获取价格
MIC3287-24YML-TR	MICROCHIP	LED DISPLAY DRIVER, DSO8	获取价格
MIC3287YD5	MICREL	1.2MHz PWM White LED Driver with OVP in Thin SOT-23 and 2mm x 2mm MFL	获取价格
MIC3287YD5TR	MICREL	LED DISPLAY DRIVER, PDSO5, LEAD FREE, MO193, SOT23, 5 PIN	获取价格