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MIC3385_10

更新时间： 2024-11-20 12:20:07
品牌 Logo 应用领域
麦瑞 - MICREL 稳压器电感器
页数 文件大小 规格书
14页 558K
描述
8MHz Inductorless Buck Regulator with LDO Standby Mode

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MIC3385_10 数据手册

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MIC3385  
8MHz Inductorless Buck Regulator  
with LDO Standby Mode  
General Description  
Features  
The Micrel MIC3385 is a high-efficiency inductorless buck  
regulator that features a LOWQ® LDO standby mode that  
draws only 18µA of quiescent current. The MIC3385  
requires no external inductor enabling an ultra-low noise,  
small size, and high efficiency solution for portable power  
applications.  
• 2.7 to 5.5V supply voltage  
• Light load LOWQ® LDO mode  
–
18µA quiescent current  
–
Low noise, 75µVrms  
• 8MHz PWM mode  
–
–
–
Output current to 600mA  
>90% efficiency  
100% maximum duty cycle  
In PWM mode, the MIC3385 operates with a constant  
frequency 8MHz PWM control. Under light load conditions,  
such as in system sleep or standby modes, the PWM  
switching operation can be disabled to reduce switching  
losses. In this light load LOWQ® mode, the LDO maintains  
the output voltage and draws only 18µA of quiescent  
current. The LDO mode of operation saves battery life  
while not introducing spurious noise and high ripple as  
experienced with pulse skipping or bursting mode  
regulators.  
• Adjustable output voltage option down to 1V  
• Ultra-fast transient response  
• NO external inductor required  
• Enables sub 1mm profile solution  
• Fully integrated MOSFET switches  
• Micropower shutdown  
• Thermal shutdown and current limit protection  
• Pb-free 14-pin 3x3.5x0.9mm MLF® package  
• –40°C to +125°C junction temperature range  
The MIC3385 operates from 2.7V to 5.5V input and  
features internal power MOSFETs that can supply up to  
600mA output current in PWM mode. It can operate with a  
maximum duty cycle of 100% for use in low-dropout  
conditions.  
Applications  
• Slim digital cameras  
• MP3 players  
• Portable power applications  
• Cellular phones  
• PDAs  
The MIC3385 is available in the 14-pin 3mm x 3.5mm  
MLF® package with a junction operating range from –40°C  
to +125°C.  
Data sheets and support documentation can be found on  
Micrel’s web site at: www.micrel.com.  
• USB peripherals  
Typical Application  
2.5V  
Efficiency  
OUT  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
V
IN  
=3.2V  
IN  
V
=3.6V  
V
=4.2V  
IN  
Adjustable Output Buck Regulator with LOWQ® Mode  
0
100 200 300 400 500 600  
OUTPUT CURRENT (mA)  
LOWQ is a registered trademark of Micrel, Inc.  
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  
M9999-051310-B  
May 2010  
1234567...14

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