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MIC4575-3.3BU PDF预览

MIC4575-3.3BU

更新时间： 2024-11-29 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
12页 216K
描述
200kHz Simple 1A Buck Voltage Regulator

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中文翻译

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MIC4575-3.3BU 数据手册

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MIC4575  
200kHz Simple 1A Buck Voltage Regulator  
General Description  
Features  
The MIC4575 is a series of easy to use fixed and adjustable  
BiCMOS step-down (buck) switch-mode voltage regulators.  
The 200kHz MIC4575 duplicates the pinout and function of  
the 52kHz LM2575. 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 1A 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% typical)  
• Standard inductors and capacitors are  
25% of typical LM2575 values.  
The MIC4575 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 1A 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)  
• Battery Charger  
• Negative boost converter  
• Step-down 6V to 3.3V for Intel Pentium™  
and similar microprocessors  
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 MIC4575 is available in TO-220 (T) and TO-263 (U)  
packages for the industrial temperature range.  
Typical Applications  
L1  
5.0V/1A  
Shutdown  
Enable  
5
1
2
SHDN  
SW  
68µH  
MIC4575-5.0BT  
VIN  
8V to 24V  
4
C2  
330µF  
16V  
FB  
C1  
150µF  
35V  
GND  
D1  
3
1N5819  
Fixed Regulator  
L1  
3.6V/1A  
5
2
Shutdown  
Enable  
SHDN  
SW  
R2  
68µH  
C3  
3300pF  
2.37k  
1%  
MIC4575BU  
1
4
6V to 24V  
C2  
330µF  
6.3V  
VIN  
FB  
C1  
22µF  
35V  
GND  
R1  
1.24k  
1%  
D1  
3
MBRS130LT3  
Adjustable Regulator  
4-106  
April 1998•  
1234567...12

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MIC4575-3.3BU 替代型号

型号 品牌 替代类型 描述 数据表
LM2595SX-3.3/NOPB TI

功能相似

 LM2595 SIMPLE SWITCHER® Power Converter 150
LM2595S-3.3/NOPB TI

功能相似

 LM2595 SIMPLE SWITCHER® Power Converter 150

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MIC4575-5.0WUTR MICROCHIP

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