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MIC4574BN

更新时间： 2024-11-28 22:05:07
品牌 Logo 应用领域
麦瑞 - MICREL 稳压器
页数 文件大小 规格书
6页 96K
描述
200kHz Simple 0.5A Buck Voltage Regulator

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中文翻译

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MIC4574BN 数据手册

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MIC4574  
200kHz Simple 0.5A Buck Voltage Regulator  
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 2:1 reduction in output filter inductor size.  
• 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 4V to 24V input voltage range  
• Wide 1.23V to 20V output voltage range  
• Requires minimum external components  
• < 200µA typical shutdown mode  
• 75% efficiency (adjustable version > 75% typ.)  
• Standard inductors and capacitors are  
25% of typical LM2574 values  
The MIC4574 is available in 3.3V, and 5V fixed output  
versions or a 1.23V to 20V 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%.  
• 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 preregulator 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 (N) and SOIC (WM) pack-  
ages for the industrial temperature range.  
• Negative boost converter  
Typical Applications  
L1  
5.0V/0.5A  
7
Shutdown  
Enable  
3
5
SHDN  
SW  
100µH  
MIC4574-5.0BN  
VIN  
SGND PGND  
8V to 24V  
1
C2  
FB  
220µF  
16V  
C1  
47µF  
35V  
D1  
2
4
1N5819  
Fixed Regulator  
L1  
3.3V/0.5A  
5
12  
Shutdown  
Enable  
SHDN  
MIC4574BWM  
VIN FB  
SGND PGND  
SW  
R2  
2.49k  
1%  
100µH  
C3  
3300pF  
10  
3
6V to 24V  
C2  
330µF  
6.3V  
C1  
10µF  
35V  
R1  
1.50k  
1%  
D1  
4
6
MBRS130LT3  
Adjustable Regulator  
4-92  
April 1998•  
123456

中文翻译

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MIC4574BN 替代型号

型号 品牌 替代类型 描述 数据表
LM2594HVN-ADJ/NOPB TI

功能相似

 LM2594/LM2594HV SIMPLE SWITCHER® Power Conve
LM2594N-ADJ/NOPB TI

功能相似

 LM2594/LM2594HV SIMPLE SWITCHER® Power Conve
LM2594HVN-ADJ TI

功能相似

 LM2594/LM2594HV SIMPLE SWITCHER® Power Conve

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