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LM2676S-3.3 PDF预览

LM2676S-3.3

更新时间： 2024-11-22 22:22:15
品牌 Logo 应用领域
美国国家半导体 - NSC 稳压器
页数 文件大小 规格书
25页 451K
描述
SIMPLE SWITCHER High Efficiency 3A Step-Down Voltage Regulator

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LM2676S-3.3 数据手册

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October 2003  
LM2676  
SIMPLE SWITCHER® High Efficiency 3A Step-Down  
Voltage Regulator  
General Description  
Features  
n Efficiency up to 94%  
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.  
n Simple and easy to design with (using off-the-shelf  
external components)  
n 150 mΩ DMOS output switch  
n 3.3V, 5V and 12V fixed output and adjustable (1.2V to  
37V ) versions  
n 50µA standby current when switched OFF  
>
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.  
n
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 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.  
n Wide input voltage range: 8V to 40V  
n 260 KHz fixed frequency internal oscillator  
n −40 to +125˚C operating junction temperature range  
Applications  
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 guaranteed to a 2% toler-  
ance. The clock frequency is controlled to within a 11%  
tolerance.  
>
n Simple to design, high efficiency ( 90%) step-down  
switching regulators  
n Efficient system pre-regulator for linear voltage  
regulators  
n Battery chargers  
Typical Application  
10091403  
SIMPLE SWITCHER® is a registered trademark of National Semiconductor Corporation.  
© 2003 National Semiconductor Corporation  
DS100914  
www.national.com  
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