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LM3481MMX PDF预览

LM3481MMX

更新时间: 2024-09-16 04:44:27
品牌 Logo 应用领域
美国国家半导体 - NSC 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
22页 442K
描述
High Efficiency Low-Side N-Channel Controller for Switching Regulators

LM3481MMX 技术参数

是否Rohs认证: 不符合生命周期:Transferred
包装说明:MSOP-10Reach Compliance Code:not_compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.22模拟集成电路 - 其他类型:SWITCHING CONTROLLER
控制模式:CURRENT-MODE控制技术:PULSE WIDTH MODULATION
最大输入电压:48 V最小输入电压:2.97 V
标称输入电压:12 VJESD-30 代码:R-PDSO-G10
JESD-609代码:e0长度:3 mm
湿度敏感等级:1功能数量:1
端子数量:10最高工作温度:125 °C
最低工作温度:-40 °C最大输出电流:1 A
封装主体材料:PLASTIC/EPOXY封装代码:TSSOP
封装等效代码:TSSOP10,.19,20封装形状:RECTANGULAR
封装形式:SMALL OUTLINE, THIN PROFILE, SHRINK PITCH认证状态:Not Qualified
座面最大高度:1.09 mm子类别:Switching Regulator or Controllers
表面贴装:YES切换器配置:BOOST
最大切换频率:1000 kHz温度等级:AUTOMOTIVE
端子面层:Tin/Lead (Sn85Pb15)端子形式:GULL WING
端子节距:0.5 mm端子位置:DUAL
宽度:3 mmBase Number Matches:1

LM3481MMX 数据手册

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November 16, 2007  
LM3481  
High Efficiency Low-Side N-Channel Controller for  
Switching Regulators  
General Description  
Key Specifications  
The LM3481 is a versatile Low-Side N-FET high performance  
controller for switching regulators. It is suitable for use in  
topologies requiring a low-side FET, such as boost, flyback,  
SEPIC, etc. The LM3481 can be operated at extremely high  
switching frequencies in order to reduce the overall solution  
size. The switching frequency of the LM3481 can be adjusted  
to any value between 100 kHz and 1 MHz by using a single  
external resistor or by synchronizing it to an external clock.  
Current mode control provides superior bandwidth and tran-  
sient response in addition to cycle-by-cycle current limiting.  
Current limit can be programmed with a single external resis-  
tor.  
Wide supply voltage range of 2.97V to 48V  
100 kHz to 1 MHz Adjustable and Synchronizable clock  
frequency  
±1.5% (over temperature) internal reference  
10 µA shutdown current (over temperature)  
Features  
10-lead MSOP package  
Internal push-pull driver with 1A peak current capability  
Current limit and thermal shutdown  
Frequency compensation optimized with a capacitor and  
a resistor  
The LM3481 has built in protection features such as thermal  
shutdown, short-circuit protection and over voltage protec-  
tion. Power saving shutdown mode reduces the total supply  
current to 5µA and allows power supply sequencing. Internal  
soft-start limits the inrush current at start-up.  
Internal softstart  
Current Mode Operation  
Adjustable Undervoltage Lockout with Hysteresis  
Pulse Skipping at Light Loads  
Applications  
Distributed Power Systems  
Notebook, PDA, Digital Camera, and other Portable  
Applications  
Offline Power Supplies  
Set-Top Boxes  
Typical Application Circuit  
201365a5  
Typical SEPIC Converter  
© 2007 National Semiconductor Corporation  
201365  
www.national.com  

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