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MIC2954-02BZT&R

更新时间： 2024-11-22 13:11:31
品牌 Logo 应用领域
麦瑞 - MICREL 稳压器调节器光电二极管输出元件
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12页 173K
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MIC2954-02BZT&R 数据手册

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MIC2954  
250mA Low-Dropout Regulator  
General Description  
Features  
TheMIC2954isa“bulletproof”efficientvoltageregulatorwith  
very low dropout voltage (typically 40mV at light loads and  
375mV at 250mA), and low quiescent current (120µA typi-  
cal). 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  
• 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 SOP-8 packages  
TheMIC2954-07/08BMisanadjustableversionthatincludes  
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  
usedasapower-onreset. Alogic-compatibleshutdowninput  
isprovidedwhichenablestheregulatortobeswitchedonand  
off. This part may be pin-strapped for 5V output, or pro-  
grammed from 1.24V to 29V with the use of two external  
resistors.  
Applications  
• Battery powered equipment  
• Cellular telephones  
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.  
• Laptop, notebook, and palmtop computers  
• PCMCIA V and V regulation/switching  
CC  
PP  
The MIC2954 has a very low output voltage temperature  
coefficient and extremely good load and line regulation  
(0.04% typical).  
• Bar code scanners  
• Automotive electronics  
• SMPS post-regulator/dc-to-dc modules  
• Voltage reference  
• High-efficiency linear power supplies  
Typical Applications  
100k  
VERR  
VOUT  
1.2V to 30V  
MIC2954  
MIC2954  
VIN  
VOUT  
VIN  
8
3
1
5
7
IN  
OUT  
GND  
IN  
OUT  
R1  
R2  
SHDN ERR  
SHUTDOWN  
ENABLE  
FB  
2.2µF  
10µF  
GND  
100pF  
4
VREF  
R1  
R2  
VOUT = VREF 1+  
2, 6 = OPEN  
5V Fixed Regulator  
Adjustable Regulator  
VIN  
+7V  
VOUT  
5V or 3.3V  
MIC2954-07/-08  
100pF  
8
1
5
7
IN  
OUT  
MIC2954-07/-08  
300k  
3
V
OUT ≈ VIN*  
VIN  
SHDN ERR  
8
1
5
7
1%  
SHUTDOWN  
ENABLE  
IN  
OUT  
FB  
3.3µF  
* MINIMUM INPUT-TO-OUTPUT  
VOLTAGE RANGES FROM  
40mV TO 400mV DEPENDING  
UPON LOAD CURRENT  
3
SHDN ERR  
GND  
SHUTDOWN  
ENABLE  
220k  
1%  
180k  
1%  
4
FB  
GND  
5V  
3.3V  
470k  
4
Q1  
2N2222  
Q1 ON = 3.3V  
Q1 OFF = 5.0V  
Wide Input-Voltage-Range Current Limiter  
5V or 3V Selectable Regulator with Shutdown  
Micrel, Inc. • 1849 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax + 1 (408) 944-0970 • http://www.micrel.com  
August 1999  
1
MIC2954  
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