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MIC2289C-34YML PDF预览

MIC2289C-34YML

更新时间： 2024-11-27 03:02:39
品牌 Logo 应用领域
麦瑞 - MICREL 驱动器肖特基二极管
页数 文件大小 规格书
10页 273K
描述
White LED Driver Internal Schottky Diode and OVP

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中文翻译

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MIC2289C-34YML 数据手册

 浏览型号MIC2289C-34YML的Datasheet PDF文件第2页浏览型号MIC2289C-34YML的Datasheet PDF文件第3页浏览型号MIC2289C-34YML的Datasheet PDF文件第4页浏览型号MIC2289C-34YML的Datasheet PDF文件第5页浏览型号MIC2289C-34YML的Datasheet PDF文件第6页浏览型号MIC2289C-34YML的Datasheet PDF文件第7页 
MIC2289C  
White LED Driver Internal Schottky  
Diode and OVP  
General Description  
Features  
The MIC2289C is a PWM (pulse width modulated), boost-  
switching regulator that is optimized for constant-current  
white LED driver applications. The MIC2289C features an  
internal Schottky diode and three levels of output  
overvoltage protection providing a small size and efficient  
DC/DC solution that requires only four external  
components.  
• 2.5V to 10V input voltage  
• Output voltage up to 34V  
• Internal Schottky diode  
• 15V, 24V, 34V output OVP options  
• 1.2 MHz PWM operation  
• Over 500mA switch current  
• 95mV feedback voltage  
• <1% line and load regulation  
• <1µA shutdown current  
To optimize efficiency, the feedback voltage is set to only  
95mV. This reduces power dissipation in the current set  
resistor and allows the lowest total output voltage, hence  
minimal current draw from the battery.  
• Overtemperature protection  
• UVLO  
The MIC2289C 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 caparison to variable frequency is much lower noise and  
input ripple injected to the input power source.  
• 2mm × 2mm 8-pin MLF® package  
• –40°C to +125°C junction temperature range  
• For higher performance specifications see the MIC2289  
The MIC2289C clamps the output voltage in case of open  
LED conditions, protecting itself and the output capacitor.  
The MIC2289C is available with three output OVP options  
of 15V, 24V, and 34V. The different OVP options allow the  
use of the smallest possible output capacitor with the  
appropriate voltage rating for a given application.  
Applications  
• White LED driver for backlighting:  
– Cell phones  
– PDAs  
– GPS systems  
The MIC2289C is available in low profile 5-pin Thin SOT-  
23 and 8-pin 2mm × 2mm MLF® package options. The  
MIC2289C has a junction temperature range of –40°C to  
+125°C.  
– Digital cameras  
– MP3 players  
– IP phones  
• LED flashlights  
• Constant current power supplies  
Data sheets and support documentation can be found on  
Micrel’s web site at www.micrel.com.  
Typical Application  
10µH  
3-Series LED Efficiency  
82  
80  
78  
76  
74  
MIC2289C-15BML  
VIN  
SW  
1-Cell  
Li Ion  
1µF  
0.22µF/16V  
OUT  
FB  
95mV  
EN  
GND  
72  
VIN =3.6V  
15 20 25  
70  
0
5
10  
IOUT (mA)  
3-Series White LED Driver  
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  
M9999-090706  
September 2006  
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