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MIC4574BWM PDF预览

MIC4574BWM

更新时间: 2024-11-29 22:05:07
品牌 Logo 应用领域
麦瑞 - MICREL 稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管信息通信管理
页数 文件大小 规格书
6页 96K
描述
200kHz Simple 0.5A Buck Voltage Regulator

MIC4574BWM 技术参数

是否Rohs认证: 不符合生命周期:Obsolete
零件包装代码:SOIC包装说明:LSOP, SOP14,.4
针数:14Reach Compliance Code:compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.6Is Samacsys:N
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-G14JESD-609代码:e0
长度:8.65 mm湿度敏感等级:1
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
封装等效代码:SOP14,.4封装形状:RECTANGULAR
封装形式:SMALL OUTLINE, LOW PROFILE峰值回流温度(摄氏度):240
认证状态:Not Qualified座面最大高度:1.6 mm
子类别:Switching Regulator or Controllers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端子面层:Tin/Lead (Sn/Pb)
端子形式:GULL WING端子节距:1.27 mm
端子位置:DUAL处于峰值回流温度下的最长时间:30
宽度:3.9 mmBase Number Matches:1

MIC4574BWM 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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