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MIC2285

更新时间： 2024-11-28 14:54:55
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美国微芯 - MICROCHIP /
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14页 559K
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The MIC2285 is a high efficiency 8MHz pulse width modulated (PWM) synchronous buck (stepdown) re

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MIC2285 数据手册

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MIC2285  
8MHz PWM Synchronous Buck  
Regulator with LDO Standby Mode  
General Description  
Features  
The Micrel MIC2285 is a high efficiency 8MHz pulse  
width modulated (PWM) synchronous buck (step-  
down) regulator that features a LOWQ™ LDO standby  
mode that draws only 18µA of quiescent current. The  
MIC2285 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 500mA  
>90% efficiency  
100% maximum duty cycle  
In PWM mode, the MIC2285 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  
• Uses a tiny 0.47µH inductor  
• Enables sub 1mm profile solution  
• Fully integrated MOSFET switches  
• Micropower shutdown  
• Thermal shutdown and current limit protection  
• Pb-free 10-pin 3mm x 3mm MLF package  
• –40°C to +125°C junction temperature range  
The MIC2285 operates from a 2.7V to 5.5V input  
voltage and features internal power MOSFETs that can  
supply up to 500mA output current in PWM mode. It  
can operate with a maximum duty cycle of 100% for  
use in low-dropout conditions.  
Applications  
The MIC2285 is available in the 10-pin 3mm x 3mm  
MLF™ package with a junction operating range from  
–40°C to +125°C.  
• Cellular phones  
• PDAs  
• USB peripherals  
Data sheets and support documentation can be found  
on Micrel’s web site at: www.micrel.com.  
____________________________________________________________________________________________________  
Typical Application  
1.8V  
Efficiency  
OUT  
100  
90  
80  
70  
60  
50  
40  
30  
20  
10  
0
V
=3.2V  
IN  
V
=3.6V  
IN  
=4.2V  
V
IN  
Adjustable Output Buck Regulator with LOWQ™ Mode  
0
100 200 300 400 500  
OUTPUT CURRENT (mA)  
Patent Pending  
LOWQ is a trademark of Micrel, Inc  
MLF and MicroLeadFrame are 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  
M9999-012406  
www.micrel.com  
January 2006  
1234567...14

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