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12B1784MIC4574-5.0BN

更新时间： 2024-09-29 23:17:35
品牌 Logo 应用领域
其他 - ETC /
页数 文件大小 规格书
7页 80K
描述
IC-0.5A 5V VOLT REGULATOR

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中文翻译

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12B1784MIC4574-5.0BN 数据手册

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MIC4574  
200kHz Simple 0.5A Buck Voltage Regulator  
Preliminary Information  
General Description  
Features  
The MIC4574 is a series of easy to use fixed and adjustable  
BiCMOS step-down (buck) switch-mode voltage regulators.  
The 200kHz MIC4574 duplicates the pinout and function of  
the 52kHz LM2574. The higher switching frequency may  
allow up to a 4:1 reduction in output filter inductor values.  
• Fixed 200kHz operation  
• 3.3V, 5V, and adjustable output versions  
• Voltage over specified line and load conditions:  
Fixed version: ±3% max. output voltage  
Adjustable version: ±2% max. feedback voltage  
• Guaranteed 0.5A switch current  
• Wide input voltage range: 4V to 24V  
• Wide output voltage range: 1.23V to 18V  
• Requires minimum external components  
• Shutdown mode < 200µA typ.  
The MIC4574 is available in 3.3V, and 5V fixed output  
versions or a 1.23V to 18V adjustable output version. Both  
versions are capable of driving a 0.5A load with excellent line  
and load regulation.  
The feedback voltage is guaranteed to ±2% tolerance for  
adjustable versions, and the output voltage is guaranteed to  
±3% for fixed versions, within specified voltages and load  
conditions. The oscillator frequency is guaranteed to ±10%.  
• 75% efficiency (adjustable version > 75% typ.)  
• Standard inductors and capacitors are  
25% of typical LM2574 values.  
• Thermal shutdown  
In shutdown mode, the regulator draws less than 200µA  
standby current. The regulator performs cycle-by-cycle  
current limiting and thermal shutdown for protection under  
fault conditions.  
• Overcurrent protection  
• 100% electrical thermal limit burn-in  
Applications  
• Simple high-efficiency step-down (buck) regulator  
• Efficient pre-regulator for linear regulators  
• On-card switching regulators  
• Positive to negative converter (inverting buck-boost)  
• Isolated flyback converter using minimum external  
components  
This series of simple switch-mode regulators requires a  
minimum number of external components and can operate  
using a standard series of inductors. Frequency compensa-  
tion is provided internally.  
The MIC4574 is available in DIP (BN) and SOIC (BWM)  
packages for the industrial temperature range.  
• Negative boost converter  
Typical Applications  
100µH  
+5V, 0.5A  
Shutdown  
SHDN  
MIC4574-5.0  
SW  
FB  
Enable  
1N5819  
+8V to +24V  
COUT  
220µF  
VIN  
CIN  
47µF  
PGND SGND  
Fixed Regulator  
100µH  
1N5819  
+3V, 0.5A  
Shutdown  
Enable  
SHDN  
SW  
1.43k  
MIC4574  
1%  
+4.75V to +24V  
COUT  
220µF  
VIN  
FB  
1k  
CIN  
47µF  
GND  
1%  
Adjustable Regulator  
4-92  
1997  
1234567

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