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MIC4744YML PDF预览

MIC4744YML

更新时间： 2024-11-21 10:56:59
品牌 Logo 应用领域
麦瑞 - MICREL 稳压器开关
页数 文件大小 规格书
23页 712K
描述
4 MHz Dual 2A Integrated Switch Buck Regulator

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MIC4744YML 数据手册

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MIC4744  
4 MHz Dual 2A Integrated Switch  
Buck Regulator  
General Description  
Features  
The Micrel MIC4744 is a high efficiency dual PWM buck  
(step-down) regulator that provides dual 2A current output.  
The MIC4744 operates at 4MHz. A proprietary internal  
compensation technique allows a closed loop bandwidth of  
over 200kHz.  
•
•
•
•
•
•
•
•
2.9 to 5.5V supply voltage  
4MHz PWM mode  
2A Dual output  
Greater than 90% efficiency  
100% maximum duty cycle  
Output voltage adjustable down to 0.6V  
Ultra-fast transient response  
The low on-resistance internal P-Channel MOSFET of the  
MIC4744 allows efficiencies over 90%, reduces external  
components count and eliminates the need for an  
expensive current sense resistor.  
Ultra-small external components  
Stable with a 0.47µH inductor and a 10µF output  
capacitor  
The MIC4744 operates from 2.9V to 5.5V input and the  
output can be adjusted down to 0.6V. The device can  
operate with a maximum duty cycle of 100% for use in low-  
dropout conditions.  
•
•
•
•
Fully integrated 2A MOSFET switches  
Micro-power shutdown  
Thermal shutdown and current limit protection  
Available in 3mm x 3mm 16-pin MLF® and 16-pin  
TSSOP packages  
The MIC4744 is available in the exposed pad 16-pin  
3mm x 3mm MLF® and ETSSOP-16 packages with  
junction operating temperature ranging from –40°C to  
+125°C.  
•
–40°C to +125°C junction temperature range  
All support documentation can be found on Micrel’s web  
site at: www.micrel.com.  
Applications  
•
•
•
•
•
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Broadband: xDSL modems  
Automotive satellite radios  
HD STB, DVD/TV recorder  
Computer peripherals: printers and graphic cards  
FPGA/ASIC  
General point of load  
Typical Application  
5.0Vin 3.3Vout Efficiency  
100  
98  
96  
94  
92  
90  
88  
86  
84  
82  
80  
0.0  
0.4  
0.8  
1.2  
1.6  
2.0  
OUTPUT CURRENT (A)  
2A 4MHz Dual Buck Regulator  
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  
M9999-030209-C  
March 2009  
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