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LM22678

更新时间： 2024-11-25 12:06:07
品牌 Logo 应用领域
德州仪器 - TI 稳压器
页数 文件大小 规格书
23页 1890K
描述
LM22678/LM22678Q 42V, 5A SIMPLE SWITCHER Step-Down Voltage Regulator with Features

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LM22678 数据手册

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LM22678  
www.ti.com  
SNVS585K –SEPTEMBER 2008–REVISED MARCH 2013  
®
LM22678/LM22678Q 42V, 5A SIMPLE SWITCHER Step-Down Voltage Regulator with  
Features  
Check for Samples: LM22678  
1
FEATURES  
DESCRIPTION  
The LM22678 switching regulator provides all of the  
functions necessary to implement an efficient high  
voltage step-down (buck) regulator using a minimum  
of external components. This easy to use regulator  
23  
•
Wide Input Voltage Range: 4.5V to 42V  
Internally Compensated Voltage Mode Control  
Stable with Low ESR Ceramic Capacitors  
100 mΩ N-Channel MOSFET  
•
•
•
•
incorporates  
a 42V N-channel MOSFET switch  
capable of providing up to 5A of load current.  
Excellent line and load regulation along with high  
efficiency (>90%) are featured. Voltage mode control  
offers short minimum on-time, allowing the widest  
ratio between input and output voltages. Internal loop  
compensation means that the user is free from the  
tedious task of calculating the loop compensation  
components. Fixed 5V output and adjustable output  
voltage options are available. A switching frequency  
of 500 kHz allows for small external components and  
good transient response. A precision enable input  
allows simplification of regulator control and system  
power sequencing. In shutdown mode the regulator  
draws only 25 µA (typ.). Built in soft-start (500µs, typ)  
saves external components. The LM22678 also has  
built in thermal shutdown, and current limiting to  
protect against accidental overloads.  
Output Voltage Options:  
–
–
-ADJ (Outputs as Low as 1.285V)  
-5.0 (Output Fixed to 5V)  
•
•
•
±1.5% Feedback Reference Accuracy  
Switching Frequency of 500 kHz  
-40°C to 125°C Operating Junction  
Temperature Range  
•
•
•
•
•
Precision Enable Pin  
Integrated Boot-Strap Diode  
Integrated Soft-Start  
Fully WEBENCH® enabled  
LM22678Q is an Automotive Grade Product  
that is AEC-Q100 Grade 1 Qualified (-40°C to  
+125°C Operating Junction Temperature)  
The LM22678 is a member of Texas Instruments'  
•
PFM (Exposed Pad) Package  
SIMPLE  
SWITCHER®  
family.  
The  
SIMPLE  
SWITCHER concept provides for an easy to use  
complete design using a minimum number of external  
components and the TI WEBENCH design tool. TI's  
WEBENCH tool includes features such as external  
component calculation, electrical simulation, thermal  
simulation, and Build-It boards for easy design-in.  
APPLICATIONS  
•
•
•
•
Industrial Control  
Telecom and Datacom Systems  
Embedded Systems  
Conversions from Standard 24V, 12V and 5V  
Input Rails  
Simplified Application Schematic  
VIN  
VIN  
FB  
BOOT  
SW  
LM22678-ADJ  
VOUT  
EN  
GND  
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.  
SIMPLE SWITCHER, WEBENCH are registered trademarks of Texas Instruments.  
2
3
All other 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 © 2008–2013, Texas Instruments Incorporated  
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LM22678 替代型号

型号 品牌 替代类型 描述 数据表
LM22674-Q1 TI

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LM22678-Q1 TI

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