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LM2642MTC

更新时间： 2024-11-23 00:01:07
品牌 Logo 应用领域
美国国家半导体 - NSC 开关控制器
页数 文件大小 规格书
21页 606K
描述
Two-Phase Synchronous Step-Down Switching Controller

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中文翻译

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LM2642MTC 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：3.65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：30 V最小输入电压：4.5 V
标称输入电压：15 VJESD-30 代码：R-PDSO-G28
JESD-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）：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：PHASE-SHIFT
最大切换频率：340 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：30宽度：4.4 mm
Base Number Matches：1

LM2642MTC 数据手册

 浏览型号LM2642MTC的Datasheet PDF文件第2页浏览型号LM2642MTC的Datasheet PDF文件第3页浏览型号LM2642MTC的Datasheet PDF文件第4页浏览型号LM2642MTC的Datasheet PDF文件第5页浏览型号LM2642MTC的Datasheet PDF文件第6页浏览型号LM2642MTC的Datasheet PDF文件第7页 
May 2003  
LM2642  
Two-Phase Synchronous Step-Down Switching  
Controller  
General Description  
The LM2642 consists of two current mode synchronous  
buck regulator controllers with a switching frequency of  
300kHz.  
Features  
n Two synchronous buck regulators  
n 180˚ out of phase operation  
n 4.5V to 30V input range  
The two switching regulator controllers operate 180˚ out of  
phase. This feature reduces the input ripple RMS current,  
thereby significantly reducing the required input capacitance.  
The two switching regulator outputs can also be paralleled to  
operate as a dual-phase single output regulator.  
n Power good function monitors Ch.1  
n 37µA Shutdown current  
n 0.04% (typical) line and load regulation error  
n Current mode control with or without a sense resistor  
n Independent enable/soft-start pins allow simple  
sequential startup configuration.  
n Configurable for single output parallel operation. (See  
Figure 2).  
The output of each channel can be independently adjusted  
from 1.3 to VIN• maximum duty cycle. An internal 5V rail is  
also available externally for driving bootstrap circuitry.  
Current-mode feedback control assures excellent line and  
load regulation and a wide loop bandwidth for excellent  
response to fast load transients. Current is sensed across  
either the Vds of the top FET or across an external current-  
sense resistor connected in series with the drain of the top  
FET. Current limit is independently adjustable for each chan-  
nel.  
n Adjustable cycle-by-cycle current limit  
n Input under-voltage lockout  
n Output over-voltage latch protection  
n Output under-voltage protection with delay  
n Thermal shutdown  
n Self discharge of output capacitors when the regulator is  
OFF  
n TSSOP package  
The LM2642 features analog soft-start circuitry that is inde-  
pendent of the output load and output capacitance. This  
makes the soft-start behavior more predictable and control-  
lable than traditional soft-start circuits.  
Applications  
n Embedded computer systems  
n High end gaming systems  
n Set-top boxes  
A PGOOD1 pin is provided to monitor the dc output of  
channel 1. Over-voltage protection is available for both out-  
puts. A UV-Delay pin is also available to allow delayed shut  
off time for the IC during an output under-voltage event.  
n WebPAD  
Block Diagram  
20046201  
© 2003 National Semiconductor Corporation  
DS200462  
www.national.com  
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LM2642MTC 替代型号

型号 品牌 替代类型 描述 数据表
LM2642MTC/NOPB TI

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