Datasheet > MIC2291

MIC2291

更新时间： 2024-11-28 22:54:51

品牌	Logo	应用领域
麦瑞 - MICREL		驱动器闪光灯
页数	文件大小	规格书
9页	108K
描述
1.2A PWM Boost Regulator Photo Flash LED Driver

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MIC2291 数据手册

MIC2291

Micrel

MIC2291

1.2A PWM Boost Regulator

Photo Flash LED Driver

General Description

Features

The MIC2291 is a 1.2MHz Pulse Width Modulation (PWM),

boost-switching regulator that is optimized for high-current,

whiteLEDphotoflashapplications. Withaguaranteedswitch

current of 1.2A, the MIC2291 easily drives a string of 3 white

LEDs in series at 100mA, ensuring a high level of brightness

and eliminating several ballast resistors.

• 2.5V to 10V input voltage

• Output voltage up to 34V

• 1.2A switch current

• 1.2MHz PWM operation

• 95mV feedback voltage

• Overvoltage protection (OVP)

– Options for 15V and 34V

• Stable with ceramic capacitors

• <1% line and load regulation

• 1µA shutdown current

The MIC2291 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,

in contrast to variable frequency topologies, is much lower

noise and input ripple injected back to the battery source.

• Over temperature protection

• UVLO

• Low-profile Thin SOT23-5 package option

• 2mm × 2mm MLF™ package option

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

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

• Photo Flash LED driver

• Cell phones

The MIC2291 is available with 2 levels of over-voltage

protection, 15V, and 34V. This allows designers to choose

the smallest possible external components with the appropri-

ate voltage ratings for their applications.

• PDAs

• GPS systems

• Digital cameras

• IP phones

The MIC2291 is available in low-profile, Thin SOT23 5-lead

and8-lead2mm×2mmMLF™packageoptions.TheMIC2291

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

• LED flashlights

All support documentation can be found on Micrel’s web

site at www.micrel.com.

Typical Application

10µH

100mA

MIC2291-15BML

MIC2291BD5

VIN

1-Cell

Li Ion

3V to 4.2V

1-Cell

Li Ion

3V to 4.2V

1µF

0.22µF

ceramic

OVP

0.22µF

95mV

0.95Ω

95mV

0.95Ω

GND

Thin SOT23 Flash LED Driver

2mm × 2mm Flash LED Driver with Output OVP

MLF and MicroLeadFrame are trademarks of Amkor Technology, Inc.

PowerPAK is a trademark of Siliconix, 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

M9999-081104

August, 2004

12 3 4 5 6 7...9

中文翻译

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与MIC2291相关器件

型号	品牌	获取价格	描述	数据表
MIC2291_07	MICREL	获取价格	1.2A PWM Boost Regulator Photo Flash LED Driver
MIC2291_11	MICREL	获取价格	1.2A PWM Boost Regulator Photo Flash LED Driver
MIC2291-15BML	MICREL	获取价格	1.2A PWM Boost Regulator Photo Flash LED Driver
MIC2291-15BMLTR	MICREL	获取价格	LED Driver, 3-Segment, 2 X 2 MM, MLF-8
MIC2291-15YML	MICREL	获取价格	1.2A PWM Boost Regulator Photo Flash LED Driver
MIC2291-15YMLTR	MICREL	获取价格	暂无描述
MIC2291-34BML	MICREL	获取价格	1.2A PWM Boost Regulator Photo Flash LED Driver
MIC2291-34YML	MICREL	获取价格	1.2A PWM Boost Regulator Photo Flash LED Driver
MIC2291-34YMLTR	MICREL	获取价格	LED DISPLAY DRIVER, DSO8, 2 X 2 MM, LEAD FREE, MLF-8
MIC2291-34YML-TR	MICROCHIP	获取价格	LED DISPLAY DRIVER, DSO8

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