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MIC2285A

更新时间： 2024-11-25 14:55:39
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美国微芯 - MICROCHIP /
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14页 546K
描述
The MIC2285A is a high efficiency 8MHz PWM synchronous buck (step-down) regulator that features

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MIC2285A 数据手册

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MIC2285A  
8MHz PWM Synchronous Buck Regulator  
with LDO Standby Mode  
General Description  
Features  
The Micrel MIC2285A is a high efficiency 8MHz  
PWM synchronous buck (step-down) regulator that  
features a LOWQ® LDO standby mode that draws  
only 20µA of quiescent current. The MIC2285A  
allows an ultra-low noise, small size, and high  
efficiency solution for portable power applications.  
• 2.7 to 5.5V supply/input voltage  
• Light load LOWQ® LDO mode  
–
–
20µA quiescent current  
Low noise, 75µVrms  
• 8MHz PWM mode  
–
–
–
Output current to 600mA  
>90% efficiency  
100% maximum duty cycle  
In PWM mode, the MIC2285A 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  
Fixed output voltage options available  
–
• Ultra-fast transient response  
• Requires only a 0.47µH inductor  
• Enables sub 0.55mm profile solution  
• Fully integrated MOSFET switches  
• Micropower shutdown  
• Thermal shutdown and current limit protection  
• 10-pin 2mm x 2mm x 0.55mm MLF® package  
• –40°C to +125°C junction temperature range  
The MIC2285A 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.  
The MIC2285A is available in the 10-pin 2mm x  
2mm Thin 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.  
Applications  
• Cellular phones  
• PDAs  
• USB peripherals  
____________________________________________________________________________________________________  
Typical Application  
2.5V  
Efficiency  
OUT  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
V
=3.2V  
=3.6V  
=4.2V  
IN  
V
IN  
V
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  
M9999-083107-B  
August 2007  
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