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MIC3172BM

更新时间： 2024-11-19 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
页数 文件大小 规格书
16页 133K
描述
100kHz 1.25A Switching Regulators Preliminary Information

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中文翻译

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MIC3172BM 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：SOP, SOP8,.25
针数：8Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.17模拟集成电路 - 其他类型：SWITCHING REGULATOR
控制模式：CURRENT-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：40 V最小输入电压：3 V
标称输入电压：5 VJESD-30 代码：R-PDSO-G8
JESD-609代码：e0长度：4.93 mm
湿度敏感等级：1功能数量：1
端子数量：8最高工作温度：85 °C
最低工作温度：-40 °C最大输出电流：3.5 A
标称输出电压：1.24 V封装主体材料：PLASTIC/EPOXY
封装代码：SOP封装等效代码：SOP8,.25
封装形状：RECTANGULAR封装形式：SMALL OUTLINE
峰值回流温度（摄氏度）：240认证状态：Not Qualified
座面最大高度：1.73 mm子类别：Switching Regulator or Controllers
最大供电电流 (Isup)：9 mA表面贴装：YES
切换器配置：SINGLE最大切换频率：115 kHz
技术：BIPOLAR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：3.94 mm
Base Number Matches：1

MIC3172BM 数据手册

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MIC2172/3172  
100kHz 1.25A Switching Regulators  
Preliminary Information  
slave’s. The master MIC2172’s oscillator frequency is in-  
creased up to 135kHz by connecting a resistor from SYNC to  
ground (see applications information).  
General Description  
The MIC2172 and MIC3172 are complete 100kHz SMPS  
current-mode controllers with internal 65V 1.25A power  
switches. The MIC2172 features external frequency syn-  
chronization or frequency adjustment, while the MIC3172  
features an enable/shutdown control input.  
The MIC2172/3172 is available in an 8-pin plastic DIP or  
SOIC for –40°C to +85°C operation.  
Features  
• 1.25A, 65V internal switch rating  
• 3V to 40V input voltage range  
• Current-mode operation  
• Internal cycle-by-cycle current limit  
• Thermal shutdown  
Although primarily intended for voltage step-up applications,  
the floating switch architecture of the MIC2172/3172 makes  
it practical for step-down, inverting, and Cuk configurations  
as well as isolated topologies.  
Operating from 3V to 40V, the MIC2172/3172 draws only  
7mA of quiescent current making it attractive for battery  
operated supplies.  
• Low external parts count  
• Operates in most switching topologies  
• 7mA quiescent current (operating)  
• <1µA quiescent current, shutdown mode (MIC3172)  
• TTL shutdown compatibility (MIC3172)  
• External frequency synchronization (MIC2172)  
• External frequency trim (MIC2172)  
• Fits most LT1172 sockets (see applications info)  
The MIC3172 is for applications that require on/off control of  
the regulator. The MIC3172 is externally shutdown by  
applyingaTTLlowsignaltoEN(enable). Whendisabled, the  
MIC3172 draws only leakage current (typically less than  
1µA). ENmustbehighfornormaloperation. Forapplications  
4
not requiring control, EN must be tied to V or TTL high.  
IN  
Applications  
• Laptop/palmtop computers  
• Toys  
The MIC2172 is for applications requiring two or more SMPS  
regulators that operate from the same input supply. The  
MIC2172 features a SYNC input which allows locking of its  
internal oscillator to an external reference. This makes it  
possibletoavoidtheaudiblebeatfrequenciesthatresultfrom  
the unequal oscillator frequencies of independent SMPS  
regulators.  
• Hand-held instruments  
• Off-line converter up to 50W  
(requires external power switch)  
• Predriver for higher power capability  
• Master/slave configurations (MIC2172)  
A reference signal can be supplied by one MIC2172 desig-  
natedasamaster. Toinsurelockingoftheslave’soscillators,  
the reference oscillator frequency must be higher than the  
Typical Applications  
VOUT  
5V, 0.25A  
VIN  
4V to 6V  
+5V  
T1  
(4.75V min.)  
D2  
1N5818  
C1  
R4*  
C3*  
D1*  
C1*  
22µF  
L1  
27µH  
22µF  
R1  
C4  
470µF  
3.74k  
1%  
VOUT  
+12V, 0.14A  
VIN  
D1  
VIN  
Enable  
VSW  
N/C  
SYNC  
VSW  
EN  
Shutdown  
R1  
10.7k  
1%  
1:1.25  
PRI = 100µH  
1N5822  
MIC2172  
L
MIC3172  
COMP  
FB  
COMP  
FB  
GND  
R2  
GND  
R3  
1k  
R2  
1.24k  
1%  
C2  
470µF  
P1 P2  
S
R3  
1k  
1.24k  
P1 P2  
S
1%  
C3  
1µF  
C2  
1µF  
* Locate near MIC2172 when supply leads > 2"  
* Optional voltage clipper (may be req’d if T1 leakage inductance too high)  
Figure 1.  
Figure 2.  
MIC2172 5V to 12V Boost Converter  
MIC3172 5V Flyback Converter  
1997  
4-13  
1234567...16

中文翻译

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MIC3172BM 替代型号

型号 品牌 替代类型 描述 数据表
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