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LM2655MTC-3.3 PDF预览

LM2655MTC-3.3

更新时间: 2024-11-23 04:44:39
品牌 Logo 应用领域
美国国家半导体 - NSC 稳压器开关
页数 文件大小 规格书
16页 770K
描述
2.5A High Efficiency Synchronous Switching Regulator

LM2655MTC-3.3 数据手册

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April 2005  
LM2655  
2.5A High Efficiency Synchronous Switching Regulator  
General Description  
Features  
n Ultra-high efficiency up to 96%  
The LM2655 is a current-mode controlled PWM step-down  
switching regulator. It has the unique ability to operate in  
synchronous or asynchronous mode. This gives the de-  
signer flexibility to choose between the high efficiency of  
synchronous operation, or the low solution cost of asynchro-  
nous operation. Along with flexibility, the LM2655 offers high  
power density with the small footprint of a TSSOP-16 pack-  
age.  
n 4V to 14V input voltage range  
n Internal high-side MOSFET with low RDS(ON) = 0.033  
n 300 kHz fixed frequency internal oscillator  
n Low-side drive for synchronous operation  
n Guaranteed less than 12 µA shutdown current  
n Patented current sensing for current mode control  
n Programmable soft-start  
>
High efficiency ( 90%) is obtained through the use of an  
n Input undervoltage lockout  
internal low ON-resistance (33m) MOSFET, and an exter-  
nal N-Channel MOSFET. This feature, together with its low  
quiescent current, makes the LM2655 an ideal fit in portable  
applications.  
n Output overvoltage shutdown protection  
n Output undervoltage shutdown protection  
n Thermal Shutdown  
n 16-pin TSSOP package  
Integrated in the LM2655 are all the power, control, and drive  
functions for asynchronous operation. In addition, a low-side  
driver output allows easy synchronous operation. The IC  
uses patented current sensing circuitry that eliminates the  
external current sensing resistor required by other current-  
mode DC-DC converters. A programmable soft-start feature  
limits start up current surges and provides a means of se-  
quencing multiple power supplies.  
Applications  
n Hard disk drives  
n Internet appliances  
n TFT monitors  
n Computer peripherals  
n Battery powered devices  
Typical Application  
10128429  
© 2005 National Semiconductor Corporation  
DS101284  
www.national.com  

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