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LM2647MTC PDF预览

LM2647MTC

更新时间： 2024-11-22 22:23:07
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
25页 758K
描述
Dual Synchronous Buck Regulator Controller

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中文翻译

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LM2647MTC 技术参数

是否Rohs认证：不符合生命周期：Transferred
包装说明：TSSOP-28Reach Compliance Code：not_compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.16Is Samacsys：N
模拟集成电路 - 其他类型：DUAL SWITCHING CONTROLLER控制模式：VOLTAGE-MODE
控制技术：PULSE WIDTH MODULATION最大输入电压：5.5 V
最小输入电压：4.5 V标称输入电压：5 V
JESD-30 代码：R-PDSO-G28JESD-609代码：e0
长度：9.7 mm湿度敏感等级：3
功能数量：1端子数量：28
封装主体材料：PLASTIC/EPOXY封装代码：TSSOP
封装等效代码：TSSOP28,.25封装形状：RECTANGULAR
封装形式：SMALL OUTLINE, THIN PROFILE, SHRINK PITCH峰值回流温度（摄氏度）：235
认证状态：Not Qualified座面最大高度：1.1 mm
子类别：Switching Regulator or Controllers表面贴装：YES
切换器配置：PUSH-PULL最大切换频率：345 kHz
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：30宽度：4.4 mm
Base Number Matches：1

LM2647MTC 数据手册

 浏览型号LM2647MTC的Datasheet PDF文件第2页浏览型号LM2647MTC的Datasheet PDF文件第3页浏览型号LM2647MTC的Datasheet PDF文件第4页浏览型号LM2647MTC的Datasheet PDF文件第5页浏览型号LM2647MTC的Datasheet PDF文件第6页浏览型号LM2647MTC的Datasheet PDF文件第7页 
June 2003  
LM2647  
Dual Synchronous Buck Regulator Controller  
General Description  
Features  
n Input voltage range from 5.5V to 28V  
The LM2647 is an adjustable 200-500kHz dual channel  
voltage-mode controlled high-speed synchronous buck  
regulator controller ideally suited for battery powered appli-  
cations such as laptop and notebook computers. The  
LM2647 requires only N-channel FETs for both the upper  
and lower positions of each synchronous stage. It features  
line feedforward to improve the response to input transients.  
At very light loads, the user can choose between the high-  
efficiency Pulse-skip mode or the constant frequency  
Forced-PWM mode. Lossless current limiting without the use  
of external sense resistors is made possible by sensing the  
voltage drop across the bottom FET. A unique adaptive duty  
cycle clamping technique is incorporated to significantly re-  
duce peak currents under abnormal load conditions. The two  
independently programmable outputs switch 180˚ out of  
phase (interleaved switching) to reduce the input capacitor  
and filter requirements. The input voltage range is 5.5V to  
28V while the output voltages are adjustable down to 0.6V.  
n Synchronous dual-channel Interleaved switching  
n Forced-PWM or Pulse-skip modes  
n Lossless bottom-side FET current sensing  
n Adaptive duty cycle clamping  
n High current N-channel FET drivers  
n Low shutdown supply currents  
n Reference voltage accurate to within 1.5%  
n Output voltage adjustable down to 0.6V  
n Power Good flag and Chip Enable  
n Under-voltage lockout  
n Over-voltage/Under-voltage protection  
n Soft-start and Soft-shutdown  
n Switching frequency adjustable 200kHz-500kHz  
Applications  
n Notebook Chipset Power Supplies  
n Low Output Voltage High-Efficiency Buck Regulators  
Standard supervisory and control features include Soft-start,  
Power Good, output Under-voltage and Over-voltage protec-  
tion, Under-voltage Lockout, Soft-shutdown and Enable.  
Typical Application (Channel 2 in parenthesis)  
20056304  
© 2003 National Semiconductor Corporation  
DS200563  
www.national.com  
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