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LM2642MTC

更新时间： 2024-11-23 12:09:43
品牌 Logo 应用领域
德州仪器 - TI 开关控制器
页数 文件大小 规格书
31页 1126K
描述
LM2642 Two-Phase Synchronous Step-Down Switching Controller

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LM2642MTC 数据手册

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LM2642  
www.ti.com  
SNVS203I –MAY 2002–REVISED APRIL 2013  
LM2642 Two-Phase Synchronous Step-Down Switching Controller  
Check for Samples: LM2642  
1
FEATURES  
DESCRIPTION  
The LM2642 consists of two current mode  
2
•
•
•
•
•
•
•
Two Synchronous Buck Regulators  
180° Out of Phase Operation  
synchronous buck regulator controllers with  
switching frequency of 300kHz.  
a
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.  
Power Good Function Monitors Ch.1  
37µA Shutdown Current  
0.04% (typical) Line and Load Regulation Error  
Current Mode Control With or Without a Sense  
Resistor  
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.  
•
•
Independent Enable/Soft-start Pins Allow  
Simple Sequential Startup Configuration.  
Configurable for Single Output Parallel  
Operation. (See Figure 3).  
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 channel.  
•
•
•
•
•
•
Adjustable Cycle-by-Cycle Current Limit  
Input Under-voltage Lockout  
Output Over-voltage Latch Protection  
Output Under-voltage Protection with Delay  
Thermal Shutdown  
Self Discharge of Output Capacitors When the  
Regulator is OFF  
The LM2642 features analog soft-start circuitry that is  
independent of the output load and output  
capacitance. This makes the soft-start behavior more  
predictable and controllable than traditional soft-start  
circuits.  
•
TSSOP package  
APPLICATIONS  
A PGOOD1 pin is provided to monitor the dc output  
of channel 1. 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.  
•
•
•
•
Embedded Computer Systems  
High End Gaming Systems  
Set-top Boxes  
WebPAD  
BLOCK DIAGRAM  
VIN  
4.5V-30V  
H
UV_Delay  
VOUT1  
1.3V-27V  
L
LM2642  
PGOOD1  
SS/ON1  
SS/ON2  
H
L
VOUT2  
1.3V-27V  
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.  
All trademarks are the property of their respective owners.  
2
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 © 2002–2013, Texas Instruments Incorporated  
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LM2642MTC 替代型号

型号 品牌 替代类型 描述 数据表
LM2642MTCX/NOPB TI

类似代替

 4.5-30V, Two-Phase Peak Current Mode Synchronous Buck Controller 28-TSSOP -40 to 125
LM2642MTCX TI

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 LM2642 Two-Phase Synchronous Step-Down Switching Controller
LM2642MTC/NOPB TI

功能相似

 Two-Phase Synchronous Step-Down Switching Controller

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