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LM5642MH

更新时间： 2024-11-22 04:20:07
品牌 Logo 应用领域
美国国家半导体 - NSC 振荡器转换器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
28页 782K
描述
High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization

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中文翻译

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LM5642MH 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：5.13Is Samacsys：N
模拟集成电路 - 其他类型：DUAL SWITCHING CONTROLLER控制模式：CURRENT-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：1
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：226 kHz温度等级：AUTOMOTIVE
端子面层：Tin/Lead (Sn85Pb15)端子形式：GULL WING
端子节距：0.65 mm端子位置：DUAL
宽度：4.4 mmBase Number Matches：1

LM5642MH 数据手册

 浏览型号LM5642MH的Datasheet PDF文件第2页浏览型号LM5642MH的Datasheet PDF文件第3页浏览型号LM5642MH的Datasheet PDF文件第4页浏览型号LM5642MH的Datasheet PDF文件第5页浏览型号LM5642MH的Datasheet PDF文件第6页浏览型号LM5642MH的Datasheet PDF文件第7页 
June 2007  
LM5642/LM5642X  
High Voltage, Dual Synchronous Buck Converter with  
Oscillator Synchronization  
General Description  
The LM5642 series consists of two current mode syn-  
chronous buck regulator controllers operating 180° out of  
phase with each other at a normal switching frequency of  
200kHz for the LM5642 and at 375kHz for the LM5642X.  
Out of phase operation reduces the input RMS ripple current,  
thereby significantly reducing the required input capacitance.  
The switching frequency can be synchronized to an external  
clock between 150kHz and 250kHz for the LM5642 and be-  
tween 200 kHz and 500 kHz for the LM5642X. The two  
switching regulator outputs can also be paralleled to operate  
as a dual-phase, single output regulator.  
Features  
Two synchronous buck regulators  
■
■
■
■
180° out of phase operation  
200kHz fixed nominal frequency: LM5642  
375kHz fixed nominal frequency: LM5642X  
Synchronizable switching frequency from 150kHz to  
250kHz for the LM5642 and 200kHz to 500kHz for the  
LM5642X  
■
4.5V to 36V input range  
■
■
■
■
■
■
50µA Shutdown current  
Adjustable output from 1.3V to 90% of Vin  
The output of each channel can be independently adjusted  
from 1.3V to 90% of Vin. An internal 5V rail is also available  
externally for driving bootstrap circuitry.  
0.04% (typical) line and load regulation accuracy  
Current mode control with or without a sense resistor  
Independent enable/soft-start pins allow simple sequential  
startup configuration.  
Current-mode feedback control assures excellent line and  
load regulation and wide loop bandwidth for excellent re-  
sponse 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.  
Configurable for single output parallel operation. (See  
Figure 2)  
■
Adjustable cycle-by-cycle current limit  
■
■
■
■
■
■
Input under-voltage lockout  
The LM5642 features analog soft-start circuitry that is inde-  
pendent of the output load and output capacitance making the  
soft-start behavior more predictable and controllable than tra-  
ditional soft-start circuits.  
Output over-voltage latch protection  
Output under-voltage protection with delay  
Thermal shutdown  
Over-voltage protection is available for both outputs. A UV-  
Delay pin is also available to allow delayed shut off time for  
the IC during an output under-voltage event.  
Self discharge of output capacitors when the regulator is  
OFF  
TSSOP and eTSSOP (Exposed PAD) packages  
■
Applications  
Embedded Computer Systems  
■
■
■
■
■
■
Navigation Systems  
Telecom Systems  
Set-Top Boxes  
WebPAD  
Point Of Load Power Architectures  
Typical Application Circuit  
20060101  
© 2007 National Semiconductor Corporation  
200601  
www.national.com  
1234567...28

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LM5642MH 替代型号

型号 品牌 替代类型 描述 数据表
LM5642MHX NSC

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