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LM3477MMX

更新时间： 2024-11-25 22:51:55
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
23页 809K
描述
High Efficiency High-Side N-Channel Controller for Switching Regulator

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中文翻译

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LM3477MMX 技术参数

是否Rohs认证：不符合生命周期：Transferred
包装说明：MSOP-8Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.14Is Samacsys：N
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：35 V
最小输入电压：2.97 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：1 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：SINGLE
最大切换频率：575 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

LM3477MMX 数据手册

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June 2002  
LM3477/LM3477A  
High Efficiency High-Side N-Channel Controller for  
Switching Regulator  
n Frequency compensation optimized with a single  
capacitor and resistor  
n Internal softstart  
n Current mode operation  
n Undervoltage lockout with hysteresis  
n 8-lead Mini-SO8 (MSOP-8) package  
General Description  
The LM3477/A is a high-side N-channel MOSFET switching  
regulator controller. It can be used in topologies requiring a  
high side MOSFET such as buck, inverting (buck-boost) and  
zeta regulators. The LM3477/A’s internal push pull driver  
allows compatibility with a wide range of MOSFETs. This, the  
wide input voltage range, use of discrete power components  
and adjustable current limit allows the LM3477/A to be opti-  
mized for a wide variety of applications.  
Applications  
n Local Voltage Regulation  
n Distributed Power  
The LM3477/A uses a high switching frequency of 500kHz to  
reduce the overall solution size. Current-mode control re-  
quires only a single resistor and capacitor for frequency  
compensation. The current mode architecture also yields  
superior line and load regulation and cycle-by-cycle current  
limiting. A 5µA shutdown state can be used for power sav-  
ings and for power supply sequencing. Other features in-  
clude internal soft-start and output over voltage protection.  
The internal soft-start reduces inrush current. Over voltage  
protection is a safety feature to ensure that the output volt-  
age stays within regulation.  
n Notebook and Palmtop Computers  
n Internet Appliances  
n Printers and Office Automation  
n Battery operated Devices  
n Cable Modems  
n Battery Chargers  
Hysteretic  
Threshold  
LM3477  
) 36% of  
The LM3477A is similar to the LM3477. The primary differ-  
ence between the two is the point at which the device  
transitions into hysteretic mode. The hysteretic threshold of  
the LM3477A is one-third of the LM3477.  
programmed current  
limit  
LM3477A  
) 12% of  
programmed current  
Features  
limit  
n 500kHz switching frequency  
n Adjustable current limit  
n 1.5% reference  
*
See Hysteretic Threshold and section for more information.  
n Thermal shutdown  
Typical Application Circuit  
20003333  
Typical High Efficiency Step-Down (Buck) Converter  
© 2002 National Semiconductor Corporation  
DS200033  
www.national.com  
1234567...23

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