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LM22674-Q1

更新时间： 2024-11-26 01:18:35
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描述
LM22674/-Q1 42 V, 500 mA SIMPLE SWITCHER® Step-Down Voltage Regulator with Features

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LM22674, LM22674-Q1  
SNVS590M –SEPTEMBER 2008–REVISED NOVEMBER 2014  
®
LM22674/-Q1 42 V, 500 mA SIMPLE SWITCHER Step-Down Voltage Regulator  
with Features  
1 Features  
3 Description  
The LM22674 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  
incorporates a 42 V N-channel MOSFET switch  
capable of providing up to 500 mA 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 5 V 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 (500 µs, typ)  
saves external components. The LM22674 also has  
built in thermal shutdown, and current limiting to  
protect against accidental overloads.  
1
•
Wide Input Voltage Range: 4.5 V to 42 V  
Internally Compensated Voltage Mode Control  
Stable with Low ESR Ceramic Capacitors  
200 mΩ N-Channel MOSFET  
•
•
•
•
Output Voltage Options:  
-ADJ (Outputs as Low as 1.285 V)  
-5.0 (Output Fixed to 5 V)  
•
•
•
±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  
LM22674-Q1 is an Automotive Grade Product  
that is AEC-Q100 Grade 1 Qualified (–40°C to  
+125°C Operating Junction Temperature)  
•
SO PowerPAD (Exposed Pad)  
The LM22674 device is  
a member of Texas  
Instruments' 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.  
2 Applications  
•
•
•
•
Industrial Control  
Telecom and Datacom Systems  
Embedded Systems  
Conversions from Standard 24 V, 12 V and 5 V  
Input Rails  
Device Information(1)  
PART NUMBER  
LM22674  
PACKAGE  
BODY SIZE (NOM)  
HSOP (8)  
4.89 mm x 3.90 mm  
LM22674-Q1  
(1) For all available packages, see the orderable addendum at  
the end of the data sheet.  
Simplified Application Schematic  
VIN  
VIN  
FB  
BOOT  
SW  
LM22674-ADJ  
VOUT  
EN  
GND  
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,  
intellectual property matters and other important disclaimers. PRODUCTION DATA.  
 
 
 
 
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LM22674-Q1 替代型号

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