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MIC4574BWMT&R PDF预览

MIC4574BWMT&R

更新时间: 2024-10-01 13:11:31
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
Switching Regulator, Voltage-mode, 1.8A, 220kHz Switching Freq-Max, BICMOS, PDSO14, 0.300 INCH, SOIC-14

MIC4574BWMT&R 技术参数

生命周期:Obsolete零件包装代码:SOIC
包装说明:LSOP,针数:14
Reach Compliance Code:unknownECCN代码:EAR99
HTS代码:8542.39.00.01风险等级:5.62
模拟集成电路 - 其他类型:SWITCHING REGULATOR控制模式:VOLTAGE-MODE
控制技术:PULSE WIDTH MODULATION最大输入电压:24 V
最小输入电压:4 V标称输入电压:12 V
JESD-30 代码:R-PDSO-G14长度:8.65 mm
功能数量:1端子数量:14
最高工作温度:85 °C最低工作温度:-40 °C
最大输出电流:1.8 A标称输出电压:1.23 V
封装主体材料:PLASTIC/EPOXY封装代码:LSOP
封装形状:RECTANGULAR封装形式:SMALL OUTLINE, LOW PROFILE
认证状态:Not Qualified座面最大高度:1.6 mm
最大供电电流 (Isup):10 mA表面贴装:YES
切换器配置:BUCK最大切换频率:220 kHz
技术:BICMOS温度等级:INDUSTRIAL
端子形式:GULL WING端子节距:1.27 mm
端子位置:DUAL宽度:3.9 mm
Base Number Matches:1

MIC4574BWMT&R 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•  

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