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MIC4684BM

更新时间： 2024-11-18 22:51:23
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
16页 215K
描述
2A High-Efficiency SuperSwitcher Buck Regulator

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中文翻译

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MIC4684BM 数据手册

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MIC4684  
2A High-Efficiency SuperSwitcher™ Buck Regulator  
Final Information  
General Description  
Features  
The MIC4684 is a high-efficiency 200kHz stepdown (buck)  
switching regulator. Power conversion efficiency of above  
85% is easily obtainable for a wide variety of applications.  
The MIC4684 achieves 2A of continuous current in an 8-lead  
SO (small outline) package at 60°C ambient temperature.  
• SO-8 package with 2A continuous output current  
• Over 85% efficiency  
• Fixed 200kHz PWM operation  
• Wide 4V to 30V input voltage range  
• Output voltage adjustable to 1.235V  
• All surface mount solution  
• Internally compensated with fast transient response  
• Over-current protection  
• Frequency foldback short-circuit protection  
• Thermal shutdown  
Highefficiencyismaintainedoverawideoutputcurrentrange  
byutilizingaboostcapacitortoincreasethevoltageavailable  
to saturate the internal power switch. As a result of this high  
efficiency, no external heat sink is required. The MIC4684,  
housed in an SO-8, can replace larger TO-220 and TO-263  
packages in many applications.  
Applications  
The MIC4684 allows for a high degree of safety. It has a wide  
input voltage range of 4V to 30V (34V transient), allowing it to  
beusedinapplicationswhereinputvoltagetransientsmaybe  
present. Built-in safety features include over-current protec-  
tion, frequency-foldback short-circuit protection, and thermal  
shutdown.  
• Simple high-efficiency step-down regulator  
• 5V to 3.3V/1.7A converter (60°C ambient)  
• 12V to 1.8V/2A converter (60°C ambient)  
• On-card switching regulator  
• Dual-output ±5V converter  
• Battery charger  
The MIC4684 is available in an 8-lead SO package with a  
junction temperature range of –40°C to +125°C.  
Ordering Information  
Part Number  
Voltage  
Junction Temperature Range  
Package  
MIC4684BM  
Adj  
–40°C to +125°C  
SOP-8  
Typical Application  
VIN  
6.5V to 25V  
MIC4684BM  
CBS  
3
4
1
5
0.33µF/50V  
VIN  
BS  
SW  
FB  
VOUT  
2.5V/1.5A  
8
EN  
Efficiency  
68µH  
R1  
CIN  
33µF  
35V  
vs. Output Current  
3.01k  
330µF  
6.3V  
100  
R2  
3.01k  
VOUT = 3.3V  
GND  
2, 6, 7  
3A  
40V  
80  
60  
40  
20  
0
VOUT = 1.8V  
VOUT = 2.5V  
Adjustable Buck Converter  
1A, 20V Feed forward diode  
MIC4684BM  
VIN = 5.0V  
0.5  
VIN  
5V  
±10%  
0
1
1.5  
2
CBS  
3
8
4
OUTPUT CURRENT (A)  
VIN  
BS  
SW  
FB  
VOUT  
3.3V/1.7A  
0.33µF/50V  
1
5
EN  
47µH  
CIN  
68µF  
10V  
Efficiency vs. Output Current  
220µF  
10V  
GND  
2, 6, 7  
2A  
20V  
5V to 3.3V Converter  
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com  
July 2001  
1
MIC4684  
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