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LM2657MTC/NOPB PDF预览

LM2657MTC/NOPB

更新时间: 2024-11-23 13:09:19
品牌 Logo 应用领域
美国国家半导体 - NSC 稳压器控制器
页数 文件大小 规格书
26页 954K
描述
IC DUAL SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO28, LEAD FREE, TSSOP-28, Switching Regulator or Controller

LM2657MTC/NOPB 技术参数

是否Rohs认证:符合生命周期:Transferred
包装说明:TSSOP, TSSOP28,.25Reach Compliance Code:compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.18Is 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:28 V
最小输入电压:4.5 V标称输入电压:15 V
JESD-30 代码:R-PDSO-G28JESD-609代码:e3
长度:9.7 mm湿度敏感等级:3
功能数量:1端子数量:28
最高工作温度:125 °C最低工作温度:-40 °C
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):260
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:500 kHz
温度等级:AUTOMOTIVE端子面层:Matte Tin (Sn)
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:4.4 mmBase Number Matches:1

LM2657MTC/NOPB 数据手册

 浏览型号LM2657MTC/NOPB的Datasheet PDF文件第2页浏览型号LM2657MTC/NOPB的Datasheet PDF文件第3页浏览型号LM2657MTC/NOPB的Datasheet PDF文件第4页浏览型号LM2657MTC/NOPB的Datasheet PDF文件第5页浏览型号LM2657MTC/NOPB的Datasheet PDF文件第6页浏览型号LM2657MTC/NOPB的Datasheet PDF文件第7页 
January 2005  
LM2657  
Dual Synchronous Buck Regulator Controller  
General Description  
Features  
n Input voltage range from 4.5V to 28V  
The LM2657 is an adjustable 200kHz-500kHz dual channel  
voltage-mode controlled high-speed synchronous buck  
regulator controller ideally suited for high current applica-  
tions. The LM2657 requires only N-channel FETs for both  
the upper and lower positions of each 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) reducing the input capacitor  
and filter requirements. The input voltage range is 4.5V 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 clamp  
n High current N-channel FET drivers  
n Low shutdown supply current  
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  
n Switching frequency adjustable 200kHz-500kHz  
n TSSOP-28 package  
Standard supervisory and control features include Soft-start,  
Power Good, output Under-voltage and Over-voltage protec-  
tion, Under-voltage Lockout, and chip Enable.  
Applications  
n Low Output Voltage High-Efficiency Buck Regulators  
Typical Application (Channel 2 in parenthesis)  
20134704  
© 2005 National Semiconductor Corporation  
DS201347  
www.national.com  

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