Datasheet > MIC2287-34YML

MIC2287-34YML

更新时间： 2024-11-23 22:13:31

品牌	Logo	应用领域
麦瑞 - MICREL		驱动器
页数	文件大小	规格书
10页	113K
描述
1.2MHz PWM White LED Driver with OVP in 2mm 】 2mm MLF⑩ and Thin SOT-23

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MIC2287-34YML 数据手册

MIC2287

Micrel

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

outputvoltageof34Vandaswitchcurrentofover500mA, the

MIC2287easilydrivesastringofupto8whiteLEDsinseries,

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

The MIC2287 is available in low profile Thin SOT-23 5-lead

and an 8-lead 2mm × 2mm MLF™ package options. The

MIC2287 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

MIC2287BD5

MIC2287-34BML

VIN

1-Cell

Li Ion

1µF

1-Cell

Li Ion

1µF

OVP

0.22µF

95mV

GND

6.3Ω

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. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com

M0510-081104

August 2004

12 3 4 5 6 7...10

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与MIC2287-34YML相关器件

型号	品牌	获取价格	描述	数据表
MIC2287-34YMLTR	MICROCHIP	获取价格	LED DISPLAY DRIVER, DSO8, 2 X 2 MM, LEAD FREE, MLF-8
MIC2287-34YML-TR	MICROCHIP	获取价格	LED DISPLAY DRIVER, DSO8
MIC2287BD5	MICREL	获取价格	1.2MHz PWM White LED Driver with OVP in 2mm 】
MIC2287BD5TR	MICROCHIP	获取价格	LED Driver, 1-Segment, PDSO5, TSOT-23, 5 PIN
MIC2287C	MICREL	获取价格	1.2MHz PWM White LED Driver with OVP in 2mm 】
MIC2287C_11	MICREL	获取价格	1.2MHz PWM White LED Driver with OVP in 2mm ×
MIC2287C-15BML	MICREL	获取价格	1.2MHz PWM White LED Driver with OVP in 2mm 】
MIC2287C-15BMLTR	MICROCHIP	获取价格	LED Driver, 6-Segment, 2 X 2 MM, MLF-8
MIC2287C-15YML	MICREL	获取价格	1.2MHz PWM White LED Driver with OVP in 2mm 】
MIC2287C-24BML	MICREL	获取价格	1.2MHz PWM White LED Driver with OVP in 2mm 】

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