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LM2676SD-3.3-NOPB PDF预览

LM2676SD-3.3-NOPB

更新时间： 2024-09-29 12:04:39
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德州仪器 - TI 稳压器
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35页 1445K
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LM2676 SIMPLE SWITCHER® High Efficiency 3A Step-Down Voltage Regulator

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LM2676  
www.ti.com  
SNVS031J –APRIL 2000–REVISED APRIL 2013  
®
LM2676 SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator  
Check for Samples: LM2676  
1
FEATURES  
DESCRIPTION  
The LM2676 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.  
2
•
Efficiency Up to 94%  
•
Simple and Easy to Design with (Using Off-  
The-Shelf External Components)  
•
•
150 mΩ DMOS Output Switch  
3.3V, 5V and 12V Fixed Output and Adjustable  
(1.2V to 37V) Versions  
•
•
50μA Standby Current When Switched OFF  
±2% Maximum Output Tolerance Over Full  
Line and Load Conditions  
The SIMPLE SWITCHER concept provides for a  
complete design using a minimum number of external  
•
•
•
Wide Input Voltage Range: 8V to 40V  
components.  
A
high fixed frequency oscillator  
(260KHz) allows the use of physically smaller sized  
components. A family of standard inductors for use  
with the LM2676 are available from several  
manufacturers to greatly simplify the design process.  
260 KHz Fixed Frequency Internal Oscillator  
−40 to +125°C Operating Junction Temperature  
Range  
The LM2676 series also has built in thermal  
shutdown, current limiting and an ON/OFF control  
input that can power down the regulator to a low  
50μA quiescent current standby condition. 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  
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.  
2
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  
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