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LM2675

更新时间： 2024-11-23 12:09:43
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德州仪器 - TI 转换器
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30页 1467K
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LM2675 SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage

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LM2675 数据手册

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LM2675  
www.ti.com  
SNVS129E –MAY 2004–REVISED JUNE 2005  
®
LM2675 SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage  
Regulator  
Check for Samples: LM2675  
1
FEATURES  
DESCRIPTION  
The LM2675 series of regulators are monolithic  
integrated circuits built with a LMDMOS process.  
These regulators provide all the active functions for a  
step-down (buck) switching regulator, capable of  
driving a 1A load current with excellent line and load  
regulation. These devices are available in fixed output  
voltages of 3.3V, 5.0V, 12V, and an adjustable output  
version.  
234  
•
Efficiency up to 96%  
•
Available in 8-pin SOIC and PDIP Packages  
and a 16-pin WSON Package  
•
Computer Design Software LM267X Made  
Simple (version 6.0)  
•
•
•
•
Simple and Easy to Design with  
Requires Only 5 External Components  
Uses Readily Available Standard Inductors  
Requiring  
a
minimum number of external  
components, these regulators are simple to use and  
include patented internal frequency compensation  
(Patent Nos. 5,382,918 and 5,514,947) and a fixed  
frequency oscillator.  
3.3V, 5.0V, 12V, and Adjustable Output  
Versions  
•
•
Adjustable Version Output Voltage Range:  
1.21V to 37V  
The LM2675 series operates at a switching frequency  
of 260 kHz, thus allowing smaller sized filter  
components than what would be needed with lower  
frequency switching regulators. Because of its very  
high efficiency (>90%), the copper traces on the  
printed circuit board are the only heat sinking needed.  
±1.5% Max Output Voltage Tolerance Over  
Line and Load Conditions  
•
•
•
•
•
Ensured 1A Output Load Current  
0.25Ω DMOS Output Switch  
Wide Input Voltage Range: 8V to 40V  
260 kHz Fixed Frequency Internal Oscillator  
A family of standard inductors for use with the  
LM2675 are available from several different  
manufacturers. This feature greatly simplifies the  
design of switch-mode power supplies using these  
advanced ICs. Also included in the datasheet are  
selector guides for diodes and capacitors designed to  
work in switch-mode power supplies.  
TTL Shutdown Capability, Low Power Standby  
Mode  
•
Thermal Shutdown and Current Limit  
Protection  
Other features include a ensured ±1.5% tolerance on  
output voltage within specified input voltages and  
output load conditions, and ±10% on the oscillator  
frequency. External shutdown is included, featuring  
typically 50 μA stand-by current. The output switch  
includes current limiting, as well as thermal shutdown  
for full protection under fault conditions.  
TYPICAL APPLICATIONS  
•
Simple High Efficiency (>90%) Step-Down  
(Buck) Regulator  
•
•
Efficient Pre-Regulator for Linear Regulators  
Positive-to-Negative Converter  
To simplify the LM2675 buck regulator design  
procedure, there exists computer design software,  
LM267X Made Simple version 6.0.  
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.  
2
3
4
SIMPLE SWITCHER is a registered trademark of Texas Instruments.  
Windows is a registered trademark of Microsoft Corporation.  
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 © 2004–2005, Texas Instruments Incorporated  
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