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MIC2202

更新时间： 2024-09-12 22:46:15
品牌 Logo 应用领域
麦瑞 - MICREL 转换器稳压器功效
页数 文件大小 规格书
18页 183K
描述
HIGH EFFICIENCY 2MHZ SYNCHRONOUS BUCK CONVERTER 1UP STABLE PWM REGULATOR

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中文翻译

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MIC2202 数据手册

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MIC2202  
High Efficiency 2MHz Synchronous Buck  
Converter 1µF Stable PWM Regulator  
General Description  
Features  
TheMicrelMIC2202isahighefficiency2MHzPWMsynchro-  
nous buck regulator. The fast 2MHz operation along with a  
proprietary compensation scheme allows the smallest pos-  
sible external components. The MIC2202 can operate with  
a 1µF ceramic output capacitor and a small, low DC-resis-  
tance, 2.2µH inductor, reducing system size and cost while  
allowing a high level of efficiency.  
• Input voltage range: 2.3V to 5.5V  
• Output down to 0.5V/600mA  
• 2MHz PWM operation  
• Stable with 1µF ceramic output capcitor.  
• Ultra-fast transient response (up to 500kHz GBW)  
• Internal compensation  
• All ceramic capacitors  
• >95% efficiency  
The MIC2202 operates from 2.3V to 5.5V input and features  
internal power MOSFETs that can supply over 600mA of  
output current with output voltages down to 0.5V. The  
MIC2202 implements a constant 2MHz pulse- width-modu-  
lation (PWM) control scheme which reduces noise in sensi-  
tive RF, audio, and communications applications. Addition-  
ally, the MIC2202 can be synchronized to an external clock,  
or multiple MIC2202s can easily be daisy-chained with the  
SYNCLOCK feature.  
• Fully integrated MOSFET switches  
• Easily synchronized to external clock  
• SYNCLOCK feature to daisy chain multiple 2202s  
• Requires only 4 external components  
• 1% line and load regulation  
• Logic controlled micropower shutdown  
• Thermal shutdown and current limit protection  
• 10-pin MSOP and 3mm×3mm MLF™-10L package  
options  
The MIC2202 has a high bandwidth loop (up to 500kHz)  
which allows ultra fast transient response times. This is very  
useful when powering applications that require fast dynamic  
response such as CPU cores and RF circuitry in high  
performance cellular phones and PDAs.  
• –40°C to +125°C junction temperature range  
Applications  
• Cellular phones  
• PDAs  
The MIC2202 is available in 10-pin MSOP and 3mm × 3mm  
MLF™-10L package options with an operating junction  
temperature range from –40°C to +125°C .  
• 802.11 WLAN power supplies  
• FPGA/ASIC power supplies  
• Dynamically adjustable power supply for CDMA/W-  
CDMA RF power amps  
• DSL modems  
• Tape drives  
Typical Application  
2.2µH  
Efficiency 3.3V  
OUT  
VOUT  
100  
3.3V  
4.2VIN  
600mA  
95  
VIN  
1
2
3
4
5
10  
9
90  
2.3V to 5.5V  
10k  
5VIN  
85  
SYNC_IN  
1µF  
8
80  
SYNC_OUT  
EN  
L = 2.2µH  
COUT = 1µF  
75  
70  
65  
60  
7
10nF  
1.78k  
6
0
0.1 0.2 0.3 0.4 0.5 0.6  
OUTPUT CURRENT (A)  
Adjustable Output Synchronous Buck Converter  
MicroLeadFrame and MLF are trademarks of Amkor Technology, Inc.  
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com  
M9999-052104  
May 2004  
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