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MIC4742YTSE

更新时间： 2024-11-25 10:56:59
品牌 Logo 应用领域
麦瑞 - MICREL 稳压器开关光电二极管
页数 文件大小 规格书
23页 590K
描述
2 MHz Dual 2A Integrated Switch Buck Regulator

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MIC4742YTSE 数据手册

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MIC4742  
2 MHz Dual 2A Integrated Switch  
Buck Regulator  
General Description  
Features  
The Micrel MIC4742 is a high efficiency dual PWM buck  
(step-down) regulator that provides dual 2A current output.  
The MIC4742 operates at 2MHz. A proprietary internal  
compensation technique allows a closed loop bandwidth of  
over 200kHz.  
•
•
•
•
•
•
•
•
2.9 to 5.5V supply voltage  
2MHz PWM mode  
2A Dual output  
Greater than 92% efficiency  
100% maximum duty cycle  
Adjustable output voltage option down to 0.6V  
Ultra-fast transient response  
The low on-resistance internal P-Channel MOSFET of the  
MIC4742 allows efficiencies over 92%, reduces external  
components count and eliminates the need for an  
expensive current sense resistor.  
Ultra-small external components  
Stable with a 1µH inductor and a 4.7µF output  
capacitor  
The MIC4742 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 a 3mm x 3mm 16-pin MLF® and 16-pin  
TSSOP  
The MIC4742 is available in the exposed pad 16-pin  
3mm x 3mm MLF® and EPAD TSSOP-16 packages with a  
junction operating range 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  
•
•
•
•
•
•
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
0.4  
0.8  
1.2  
1.6  
2
OUTPUT CURRENT (A)  
2A 2MHz 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-D  
March 2009  
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