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MIC2954_07

更新时间： 2024-11-22 10:57:11
品牌 Logo 应用领域
麦瑞 - MICREL 稳压器
页数 文件大小 规格书
15页 521K
描述
250mA Low-Dropout Regulator

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MIC2954_07 数据手册

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MIC2954  
250mA Low-Dropout Regulator  
General Description  
Features  
The MIC2954 is a “bulletproof” efficient voltage regulator  
with very low dropout voltage (typically 40mV @ light loads  
and 375mV @ 250mA), and low quiescent current (120µA  
typical). The quiescent current of the MIC2954 increases  
only slightly in dropout, thus prolonging battery life. Key  
MIC2954 features include protection against reversed  
battery, fold-back current limiting, and automotive load  
dump protection (60V positive transient).  
• High-accuracy 5V, guaranteed 250mA output  
• Low quiescent current  
• Low dropout voltage  
• Extremely tight load and line regulation  
• Very low temperature coefficient  
• Current and thermal limiting  
• Input can withstand –20V reverse battery and+60V  
positive transients  
The MIC2954-07/08BM is an adjustable version that  
includes an error flag output that warns of a low output  
voltage, which is often due to failing batteries on the input.  
This may also be used as a power-on reset. A logic-  
compatible shutdown input is provided which enables the  
regulator to be switched on and off. This part may be pin-  
strapped for 5V output, or programmed from 1.24V to 29V  
with the use of two external resistors.  
• Error flag warns of low output voltage  
• Logic-controlled electronic shutdown  
• Output programmable from 1.24V to 29V  
(MIC2954-07/08)  
• Available in TO-220, TO-92, and surface-mount SOT-  
223 and SOIC-8 packages  
Applications  
The MIC2954 is available in two voltage tolerances, ±0.5%  
maximum and ±1% maximum. Both are guaranteed for  
junction temperatures from –40°C to +125°C.  
• Battery powered equipment  
• Cellular telephones  
• Laptop, notebook, and palmtop computers  
• PCMCIA VCC and VPP regulation/switching  
• Bar code scanners  
Data sheets and support documentation can be found on  
Micrel’s web site at www.micrel.com.  
• Automotive electronics  
• SMPS post-regulator/dc-to-dc modules  
• Voltage reference  
• High-efficiency linear power supplies  
___________________________________________________________________________________________________________  
Ordering Information  
Part Number  
Junction  
Pb-Free /  
Accuracy  
0.5%  
Temp. Range  
Package  
TO-220-3  
TO-220-3  
SOT-223-3  
SOT-223-3  
TO-92-3**  
TO-92-3**  
8-Pin SOIC  
8-Pin SOIC  
Standard  
RoHS Compliant  
MIC2954-02BT  
MIC2954-03BT  
MIC2954-02BS  
MIC2954-03BS  
MIC2954-02BZ  
MIC2954-03BZ  
MIC2954-07BM  
MIC2954-08BM  
MIC2954-02WT*  
MIC2954-03WT*  
MIC2954-02WS*  
MIC2954-03WS*  
MIC2954-02YZ  
MIC2954-03YZ  
MIC2954-07YM  
MIC2954-08YM  
–40° to +125°C  
–40° to +125°C  
–40° to +125°C  
–40° to +125°C  
–40° to +125°C  
–40° to +125°C  
–40° to +125°C  
–40° to +125°C  
1.0%  
0.5%  
1.0%  
0.5%  
1.0%  
0.5%  
1.0%  
*
RoHS compliant with ‘high-melting solder’ exemption.  
** TO-92 package discontinuance notification issued September 2007. End-of-life-buy offered thru December 31, 2007.  
Contact factory for additional information.  
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com  
M9999-090607  
September 2007  
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