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LM5642MTCX

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 振荡器转换器开关光电二极管
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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LM5642MTCX 数据手册

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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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LM5642MTCX 替代型号

型号 品牌 替代类型 描述 数据表
LM5642MTC TI

功能相似

 LM5642/LM5642X High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronizati
LM5642MTC/NOPB TI

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 LM5642/LM5642X High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronizati
LM5642MTC NSC

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 High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization

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LM5642XMTX/NOPB TI

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