Datasheet > MIC2287

MIC2287

更新时间： 2023-12-06 20:11:00

品牌	Logo	应用领域
美国微芯 - MICROCHIP		/
页数	文件大小	规格书
10页	395K
描述
The MIC2287 is a 1.2MHz pulse width modulated (PWM), boost-switching regulator that is optimized f

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MIC2287 数据手册

MIC2287

Micrel, Inc.

MIC2287

1.2MHz PWM White LED Driver with OVP in

2mm × 2mm MLF™ and Thin SOT-23

General Description

Features

The MIC2287 is a 1.2MHz pulse width modulated (PWM),

boost-switching regulator that is optimized for constant-

current, white LED driver applications. With a maximum

output voltage of 34V and a switch current of over 500mA,

the MIC2287 easily drives a string of up to 8 white LEDs in

series, ensuring uniform brightness and eliminating several

ballast resistors.

• 2.5V to 10V input voltage

• Output voltage up to 34V

• Over 500mA switch current

• 1.2 MHz PWM operation

• 95mV feedback voltage

• Output Overvoltage Protection (OVP)

• Options for 15V, 24V, and 34V OVP

• <1% line and load regulation

• <1µA shutdown current

• Over-temperature protection

• UVLO

• Low proﬁle Thin SOT-23-5 package option

• 8-lead 2mm × 2mm MLF™ package option

• –40°C to +125°C junction temperature range

The MIC2287 implements a constant frequency, 1.2MHz

PWM control scheme. The high frequency PWM operation

saves board space by reducing external component sizes.

The added beneﬁt of the constant frequency PWM scheme

as opposed to variable frequency topologies is much lower

noise and input ripple injected back to the battery source.

To optimize efﬁciency, the feedback voltage is set to only

95mV. This reduces the power dissipation in the current set

resistor and allows the lowest total output voltage, hence

minimal current draw from the battery.

Applications

• White LED driver for backlighting:

- Cell phones

The MIC2287 is available with 3 levels of overvoltage protec-

tion, 15V, 24V, and 34V. This allows designers to choose the

smallest possible external components with the appropriate

voltage ratings for their applications.

- PDAs

- GPS systems

- Digital cameras

- MP3 players

- IP phones

• Photo ﬂash LED driver

• LED ﬂashlights

• Constant current power supplies

TheMIC2287isavailableinlowproﬁleThinSOT-235-leadand

an8-lead2mm×2mmMLF™packageoptions.TheMIC2287

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

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

at www.micrel.com.

Typical Application

CMDSH-3

10µH

CMDSH-3

10µH

MIC2287BD5

MIC2287-34BML

VIN

1-Cell

Li Ion

1µF

1-Cell

Li Ion

1µF

0.22µF

OVP

0.22µF

95mV

6.3Ω

95mV

6.3Ω

GND

3-Series White LED Driver in Thin SOT-23

6-Series White LED Driver

with Output OVP in 2mm × 2mm MLF™-8

MLF and MicroLeadFrame are 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

M9999-070105

July 2005

12 3 4 5 6 7...10

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与MIC2287相关器件

型号	品牌	描述	获取价格	数据表
MIC2287_05	MICREL	1.2MHz PWM White LED Driver with OVP in 2mm 】	获取价格
MIC2287-15BML	MICREL	1.2MHz PWM White LED Driver with OVP in 2mm 】	获取价格
MIC2287-15BMLTR	MICROCHIP	LED Driver, 1-Segment, 2 X 2 MM, MLF-8	获取价格
MIC2287-15YML	MICREL	1.2MHz PWM White LED Driver with OVP in 2mm 】	获取价格
MIC2287-15YMLTR	MICROCHIP	LED DISPLAY DRIVER, DSO8, 2 X 2 MM, LEAD FREE, MLF-8	获取价格
MIC2287-15YML-TR	MICROCHIP	LED DISPLAY DRIVER, DSO8	获取价格

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