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LM2673

更新时间： 2024-09-29 12:09:43
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德州仪器 - TI 稳压器
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35页 1431K
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LM2673 SIMPLE SWITCHER 3A Step-Down Voltage Regulator with Adjustable Current

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LM2673  
www.ti.com  
SNVS030N –APRIL 2000–REVISED APRIL 2013  
®
LM2673 SIMPLE SWITCHER 3A Step-Down Voltage Regulator with Adjustable Current  
Limit  
Check for Samples: LM2673  
1
FEATURES  
DESCRIPTION  
The LM2673 series of regulators are monolithic  
integrated circuits which provide all of the active  
functions for a step-down (buck) switching regulator  
capable of driving up to 3A loads with excellent line  
and load regulation characteristics. High efficiency  
(>90%) is obtained through the use of a low ON-  
resistance DMOS power switch. The series consists  
of fixed output voltages of 3.3V, 5V and 12V and an  
adjustable output version.  
23  
•
Efficiency Up to 94%  
•
Simple and Easy to Design with (Using Off-  
The-Shelf External Components)  
•
Resistor Programmable Peak Current Limit  
Over a Range of 2A to 5A  
•
•
150 mΩ DMOS Output Switch  
3.3V, 5V and 12V Fixed Output and Adjustable  
(1.2V to 37V) Versions  
The SIMPLE SWITCHER® concept provides for a  
complete design using a minimum number of external  
•
±2% Maximum Output Tolerance Over Full  
Line and Load Conditions  
components.  
A
high fixed frequency oscillator  
•
•
•
•
Wide Input Voltage Range: 8V to 40V  
260 KHz Fixed Frequency Internal Oscillator  
Softstart Capability  
(260KHz) allows the use of physically smaller sized  
components. A family of standard inductors for use  
with the LM2673 are available from several  
manufacturers to greatly simplify the design process.  
−40 to +125°C Operating Junction Temperature  
Range  
Other features include the ability to reduce the input  
surge current at power-ON by adding a softstart  
timing capacitor to gradually turn on the regulator.  
The LM2673 series also has built in thermal  
shutdown and resistor programmable current limit of  
the power MOSFET switch to protect the device and  
load circuitry under fault conditions. The output  
voltage is ensured to a ±2% tolerance. The clock  
frequency is controlled to within a ±11% tolerance.  
APPLICATIONS  
•
•
•
Simple to Design, High Efficiency (>90%) Step-  
Down Switching Regulators  
Efficient System Pre-Regulator for Linear  
Voltage Regulators  
Battery Chargers  
Typical Application  
Feedback  
0.01 mF  
Input  
Voltage  
V
IN  
Boost  
Output  
LM2673 - 5.0  
L
8V to 40V  
Voltage  
0.47 mF  
+
+
Switch  
Output  
C
IN  
2 x 15 mF/50V  
5V/3A  
33 mH  
+
Softstart  
8.2k  
Ground  
C
OUT  
Current  
Limit  
Adjust  
SR305  
180 mF/16V  
1 nF  
37,125  
I
=
CL  
R
ADJ  
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, Switchers Made Simple are registered trademarks of Texas Instruments.  
All other trademarks are the property of their respective owners.  
2
3
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 © 2000–2013, Texas Instruments Incorporated  
1234567...35

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LM2673 替代型号

型号 品牌 替代类型 描述 数据表
LM43603 TI

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