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LM2679

更新时间： 2024-11-27 11:11:43
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德州仪器 - TI 开关稳压器
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38页 1792K
描述
具有可调节电流限制功能的 SIMPLE SWITCHER® 8V 至 40V、5A 降压直流/直流开关稳压器

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LM2679  
SNVS026O –MARCH 2000–REVISED JUNE 2016  
®
LM2679 SIMPLE SWITCHER 5-A Step-Down Voltage Regulator  
With Adjustable Current Limit  
1 Features  
3 Description  
The LM2679 series of regulators are monolithic  
1
•
•
Efficiency Up to 92%  
integrated circuits which provide all of the active  
functions for a step-down (buck) switching regulator  
capable of driving up to 5-A 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 3.3 V, 5 V, and 12 V and  
an adjustable output version.  
Simple and Easy to Design Using Off-The-Shelf  
External Components  
•
Resistor Programmable Peak Current Limit Over a  
Range of 3 A to 7 A  
•
•
120-mΩ DMOS Output Switch  
3.3-V, 5-V, 12-V Fixed Output and Adjustable  
(1.2 V to 37 V) 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: 8 V to 40 V  
260-kHz Fixed Frequency Internal Oscillator  
Soft-Start Capability  
(260 kHz) allows the use of physically smaller sized  
components. A family of standard inductors for use  
with the LM2679 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 soft-start  
timing capacitor to gradually turn on the regulator.  
The LM2679 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 specified to a ±2% tolerance. The clock  
frequency is controlled to within a ±11% tolerance.  
2 Applications  
•
•
•
Simple-to-Design, High Efficiency (>90%)  
Step-Down Switching Regulators  
Efficient System Preregulator for Linear Voltage  
Regulators  
Battery Chargers  
Device Information(1)  
PART NUMBER  
PACKAGE  
BODY SIZE (NOM)  
10.10 mm × 8.89 mm  
14.986 mm × 10.16 mm  
6.00 mm × 5.00 mm  
TO-263 (7)  
LM2679  
TO-220 (7)  
VSON (14)  
(1) For all available packages, see the orderable addendum at  
the end of the data sheet.  
Typical Application  
Feedback  
0.01 mF  
Input  
Voltage  
V
IN  
Boost  
Output  
LM2679 - 5.0  
L
8V to 40V  
Voltage  
0.47 mF  
+
+
+
C
Switch  
Output  
IN  
3 x 15 mF/50V  
5V/5A  
22 mH  
+
+
Softstart  
5.6k  
Ground  
C
OUT  
2 x 180 mF/16V  
Current  
Limit  
Adjust  
6TQ045S  
1 nF  
37,125  
I
=
CL  
R
ADJ Copyright © 2016, Texas Instruments Incorporated  
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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LM2679 替代型号

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