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MIC4681 PDF预览

MIC4681

更新时间: 2024-11-08 22:51:23
品牌 Logo 应用领域
麦瑞 - MICREL 稳压器
页数 文件大小 规格书
19页 397K
描述
2A-Peak SuperSwitcher⑩ SOP-8 Buck Regulator

MIC4681 数据手册

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MIC4681  
2A-Peak SuperSwitcher™ SOP-8 Buck Regulator  
Final Information  
General Description  
Features  
The MIC4681 SuperSwitcher™ is an easy-to-use step-down  
(buck) voltage-mode switching regulator. The 200kHz  
MIC4681 achieves over 1A of continuous output current over  
a 4V to 30V input range in an 8-lead SOPpackage . The  
MIC4681 features a high 2.1A minimum current limit, making  
the device ideal for pulsed current applications such as GSM  
and TDMA cell phone battery chargers and power supplies.  
The MIC4681 sustains an output of 4.2V/2A within a typical  
GSM charging environment.  
SO-8 package with over 1A continuous output current  
Capable of 2A pulse charging for GSM applications  
All surface mount solution  
Only 4 external components required  
Fixed 200kHz operation  
Output adjustable down to 1.25V  
Internally compensated with fast transient response  
Wide 4V to 30V operating input voltage range  
Less than 6µA typical shutdown-mode current  
Up to 90% efficiency  
The MIC4681 has an input voltage range of 4V to 30V, with  
excellent line, load, and transient response. The regulator  
performs cycle-by-cycle current limiting and thermal shut-  
down for protection under fault conditions. In shutdown  
mode, the regulator draws less than 6µA of standby current.  
Thermal shutdown  
Overcurrent protection  
Applications  
The MIC4681 SuperSwitcher™ regulator requires a mini-  
mum number of external components and can operate using  
a standard series of inductors and capacitors. Frequency  
compensation is provided internally for fast transient re-  
sponse and ease of use.  
Cellular phone battery charger  
Cellular phone power supply  
Simple 1A continuous high-efficiency step-down (buck)  
regulator  
Replacement of a TO-220 and TO-263 designs  
Positive-to-negative converter (inverting buck-boost)  
Negative boost converter  
The MIC4681 is available in the 8-lead SOP with a  
–40°C to +125°C junction temperature range.  
Higher output current regulator using external FET  
Typical Applications  
MIC4681BM  
L1  
+5V to +30V  
2.5V/1A  
2
1
3
4
IN  
SW  
C1  
22µF  
68µH  
R1  
C2  
220µF  
10V  
3.01k  
35V  
SHUTDOWN  
ENABLE  
SHDN  
FB  
D1  
R2  
2.94k  
GND  
58  
B340A or  
SS36  
Power  
SOP-8  
Adjustable Regulator Circuit  
SuperSwitcher is a trademark of Micrel, Inc.  
Micrel, Inc. 1849 Fortune Drive San Jose, CA 95131 USA tel + 1 (408) 944-0800 fax + 1 (408) 944-0970 http://www.micrel.com  
February 2001  
1
MIC4681  

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