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LM22679

更新时间： 2024-11-26 02:58:19
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描述
LM22679/-Q1 42-V, 5-A SIMPLE SWITCHER® Step-Down Voltage Regulator With Features

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LM22679, LM22679-Q1  
SNVS581L –FEBRUARY 2013–REVISED NOVEMBER 2014  
®
LM22679/-Q1 42-V, 5-A SIMPLE SWITCHER Step-Down Voltage Regulator  
With Features  
1 Features  
3 Description  
The LM22679 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 that  
can provide up to 5 A 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. An adjustable soft-start feature is provided  
through the selection of a single external capacitor. In  
addition, the switch-current limit can be programmed  
with a single external resistor, allowing solution  
optimization. The LM22679 device 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  
100-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  
•
•
•
•
•
Adjustable Soft-Start  
Adjustable Current Limit  
Integrated Boot-Strap Diode  
Fully WEBENCH® Enabled  
LM22679-Q1 is AEC-Q100 Qualified and  
Manufactured on an Automotive-Grade Flow  
•
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.  
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  
LM22679  
PACKAGE  
BODY SIZE (NOM)  
TO-263 (7)  
10.16 mm x 9.85 mm  
LM22679-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  
LM22679-ADJ  
VOUT  
IADJ  
GND  
SS  
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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