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LM5642

更新时间： 2024-11-22 12:02:15
品牌 Logo 应用领域
德州仪器 - TI 振荡器转换器
页数 文件大小 规格书
40页 1403K
描述
LM5642/LM5642X High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization

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LM5642, LM5642X  
www.ti.com  
SNVS219K –JUNE 2003–REVISED APRIL 2013  
LM5642/LM5642X High Voltage, Dual Synchronous Buck Converter with Oscillator  
Synchronization  
Check for Samples: LM5642, LM5642X  
1
FEATURES  
DESCRIPTION  
The LM5642 series consists of two current mode  
synchronous 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.  
2
•
Two Synchronous Buck Regulators  
180° Out of Phase Operation  
•
•
•
•
200 kHz Fixed Nominal Frequency: LM5642  
375 kHz Fixed Nominal Frequency: LM5642X  
Synchronizable Switching Frequency from 150  
kHz to 250 kHz for the LM5642 and 200 kHz to  
500 kHz 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 150 kHz  
and 250 kHz for the LM5642 and between 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.  
•
•
•
•
4.5V to 36V Input Range  
50 µA Shutdown Current  
Adjustable Output from 1.3V to 90% of Vin  
0.04% (Typical) Line and Load Regulation  
Accuracy  
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.  
•
•
•
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 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.  
Configurable for Single Output Parallel  
Operation. (See Figure 4)  
•
•
•
•
•
•
Adjustable Cycle-by-cycle Current Limit  
Input Under-voltage Lockout  
Output Over-voltage Latch Protection  
Output Under-voltage Protection with Delay  
Thermal Shutdown  
The LM5642 features analog soft-start circuitry that is  
independent of the output load and output  
capacitance making the soft-start behavior more  
predictable and controllable than traditional soft-start  
circuits.  
Self Discharge of Output Capacitors when the  
Regulator is OFF  
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.  
•
TSSOP and HTSSOP (Exposed PAD) Packages  
APPLICATIONS  
•
•
•
•
•
•
Embedded Computer Systems  
Navigation Systems  
Telecom Systems  
Typical Application Circuit  
V
IN  
4.5V - 36V  
Set-Top Boxes  
UV_Delay  
Vout1  
1.3V-0.9VIN  
WebPAD  
SYNC  
Point Of Load Power Architectures  
LM5642/LM5642X  
SS/ON1  
SS/ON2  
Vout2  
1.3V-0.9VIN  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
2
All trademarks are the property of their respective owners.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2003–2013, Texas Instruments Incorporated  
1234567...40

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