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LM3489MM

更新时间: 2024-11-23 04:44:27
品牌 Logo 应用领域
美国国家半导体 - NSC 控制器
页数 文件大小 规格书
15页 794K
描述
Hysteretic PFET Buck Controller with Enable Pin

LM3489MM 技术参数

是否Rohs认证: 不符合生命周期:Transferred
包装说明:PLASTIC, MSOP-8Reach Compliance Code:not_compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.19其他特性:ALSO OPERATES IN ADJUSTABLE MODE FROM 1.239 V TO 35 V; ALSO OPERATES IN PWM CONTROL TECHNIQUE
模拟集成电路 - 其他类型:SWITCHING CONTROLLER控制模式:CURRENT-MODE
控制技术:HYSTERETIC CURRENT MODE最大输入电压:35 V
最小输入电压:4.5 V标称输入电压:12 V
JESD-30 代码:S-PDSO-G8JESD-609代码:e0
长度:3 mm湿度敏感等级:1
功能数量:1端子数量:8
最高工作温度:125 °C最低工作温度:-40 °C
最大输出电流:0.44 A封装主体材料:PLASTIC/EPOXY
封装代码:TSSOP封装等效代码:TSSOP8,.19
封装形状:SQUARE封装形式:SMALL OUTLINE, THIN PROFILE, SHRINK PITCH
峰值回流温度(摄氏度):260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:BUCK
最大切换频率:1000 kHz温度等级:AUTOMOTIVE
端子面层:Tin/Lead (Sn/Pb)端子形式:GULL WING
端子节距:0.65 mm端子位置:DUAL
处于峰值回流温度下的最长时间:40宽度:3 mm
Base Number Matches:1

LM3489MM 数据手册

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May 2006  
LM3489  
Hysteretic PFET Buck Controller with Enable Pin  
n Wide 4.5V to 35V input range  
n 1.239V to VIN adjustable output range  
The LM3489 is a high efficiency PFET switching regulator  
n High efficiency 93%  
General Description  
controller that can be used to quickly and easily develop a  
n
1.3% ( 2% over temp) internal reference  
small, cost effective, switching buck regulator for a wide  
range of applications. The hysteretic control architecture  
provides for simple design without any control loop stability  
concerns using a wide variety of external components. The  
PFET architecture also allows for low component count as  
well as ultra-low dropout, 100% duty cycle operation. An-  
other benefit is high efficiency operation at light loads without  
an increase in output ripple. A dedicated Enable Pin provides  
a shutdown mode drawing only 7µA. Leaving the Enable Pin  
unconnected defaults to on.  
n 100% duty cycle operation  
n Maximum operation frequency 1MHz  
n Current limit protection  
n Dedicated enable pin (on if unconnected)  
n Shutdown mode draws only 7µA supply current  
n MSOP-8  
>
Applications  
n Set-Top Box  
n DSL/Cable Modem  
n PC/IA  
n Auto PC  
n TFT Monitor  
n Battery Powered Portable Applications  
n Distributed Power Systems  
n Always On Power  
n High Power LED Driver  
Current limit protection can be implemented by measuring  
the voltage across the PFET’s RDS(ON), thus eliminating the  
need for a sense resistor. A sense resistor may be used to  
improve current limit accuracy if desired. The cycle-by-cycle  
current limit can be adjusted with a single resistor, ensuring  
safe operation over a range of output currents.  
Features  
n Easy to use control methodology  
n No control loop compensation required  
Typical Application Circuit  
20186908  
© 2006 National Semiconductor Corporation  
DS201869  
www.national.com  

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