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MIC2291YD5

更新时间： 2024-11-13 22:10:43
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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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MIC2291YD5 数据手册

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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  
10µH  
100mA  
100mA  
MIC2291-15BML  
MIC2291BD5  
5
4
1
3
VIN  
EN  
SW  
VIN  
SW  
1-Cell  
Li Ion  
3V to 4.2V  
1-Cell  
Li Ion  
3V to 4.2V  
1µF  
1µF  
0.22µF  
ceramic  
OVP  
0.22µF  
FB  
EN  
95mV  
0.95Ω  
FB  
95mV  
0.95Ω  
GND  
GND  
2
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  
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