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MIC4682YM-TR

更新时间： 2024-11-20 07:33:47
品牌 Logo 应用领域
麦瑞 - MICREL 开关光电二极管
页数 文件大小 规格书
15页 907K
描述
1.1A SWITCHING REGULATOR, 220kHz SWITCHING FREQ-MAX, PDSO8

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MIC4682YM-TR 数据手册

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MIC4682  
Precision Current Limit SOIC-8  
SuperSwitcher™ Buck Regulator  
General Description  
Features  
The MIC4682 is an easy-to-use step-down (buck) switch-  
mode voltage regulator. It features a programmable  
current limit that allows 10% current limit accuracy over its  
full operating temperature range. The precision current  
limit makes the MIC4682 ideal for constant-voltage  
constant-current applications, such as simple battery  
chargers. The precision current limit also gives designers  
the ability to set the maximum output current below the  
saturation current rating of the inductor. This allows the  
use of the smallest possible inductors for a given  
application, saving valuable space and cost.  
• Programmable output current limit  
10% accuracy over temperature  
–
• Wide 4V to 34V operating input voltage range  
• Fixed 200kHz PWM operation  
• Power SOIC-8 package allows 2A continuous output  
current  
• All surface mount solution  
• Internally compensated  
• Less than 1µA typical shutdown-mode current  
• Thermal shutdown protection  
The MIC4682 is a very robust device. Its 4V to 34V input  
voltage range allows the MIC4682 to safely be used in  
applications where voltage transients may be present.  
Additional protection features include cycle-by-cycle  
current limiting and over-temperature shutdown. The  
MIC4682 is available in a thermally optimized power  
SOIC-8 package that allows it to achieve 2A of continuous  
output current.  
Applications  
• Battery chargers  
• White LED drivers  
• Constant voltage constant current step-down  
converters  
The MIC4682 requires a minimum number of external  
components and can operate using a standard series of  
inductors. Compensation is provided internally for fast  
transient response and ease of use. The MIC4682 is  
available in the 8-pin power SOIC with a –40°C to +125°C  
junction temperature range.  
• Simple step-down regulator with precise current limit  
• USB power supplies  
Data sheets and support documentation can be found on  
Micrel’s web site at: www.micrel.com.  
___________________________________________________________________________________________________________  
Typical Application  
MIC4682 Current Limit  
Characteristics  
MIC4682  
L1  
+7.5V to +34V  
5V/1A  
5
8
1
IN  
SW  
6
5
4
3
2
1
0
C1  
10µF  
50V  
68µH  
R1  
C2  
220µF  
10V  
3.01k  
4
SHDN  
FB  
(x2)  
D1  
B240  
R2  
976  
R3  
10M  
ISET  
GND  
3
2, 6, 7  
R4  
16.2k  
VIN = 12V  
0
0.5  
1
1.5  
2
CURRENT LIMIT (A)  
Constant Current/Constant Voltage Li-Ion Battery Charger  
SuperSwitcher is a trademark of Micrel, 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  
M9999-061507  
June 2007  
1234567...15

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