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LM2651

更新时间： 2024-11-23 00:01:07
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
11页 215K
描述
1.5A High Efficiency Synchronous Switching Regulator

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LM2651 数据手册

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February 2000  
LM2651  
1.5A High Efficiency Synchronous Switching Regulator  
General Description  
Features  
%
n Ultra high efficiency up to 97  
The LM2651 switching regulator provides high efficiency  
power conversion over a 100:1 load range (1.5A to 15mA).  
This feature makes the LM2651 an ideal fit in  
battery-powered applications that demand long battery life in  
both run and standby modes.  
n High efficiency over a 1.5A to milliamperes load range  
n 4V to 14V input voltage range  
n 1.8V, 2.5V, 3.3V, or ADJ output voltage  
n Internal MOSFET switch with low RDS(on) of 75mΩ  
n 300kHz fixed frequency internal oscillator  
n 7µA shutdown current  
n Patented current sensing for current mode control  
n Input undervoltage lockout  
n Adjustable soft-start  
%
Synchronous rectification is used to achieve up to 97 effi-  
ciency. At light loads, the LM2651 enters a low power hyster-  
etic or “sleep” mode to keep the efficiency high. In many ap-  
plications, the efficiency still exceeds 80 at 15mA load. A  
shutdown pin is available to disable the LM2651 and reduce  
the supply current to less than 10µA.  
%
n Current limit and thermal shutdown  
n 16-pin TSSOP package  
The LM2651 contains a patented current sensing circuitry for  
current mode control. This feature eliminates the external  
current sensing resistor required by other current-mode  
DC-DC converters.  
Applications  
n Personal digital assistants (PDAs)  
n Computer peripherals  
n Battery-powered devices  
n Handheld scanners  
n High efficiency 5V conversion  
The LM2651 has a 300 kHz fixed frequency internal oscilla-  
tor. The high oscillator frequency allows the use of extremely  
small, low profile components.  
A programmable soft-start feature limits current surges from  
the input power supply at start up and provides a simple  
means of sequencing multiple power supplies.  
Other protection features include input undervoltage lockout,  
current limiting, and thermal shutdown.  
Typical Application  
DS100925-1  
DS100925-15  
Efficiency vs Load Current  
=
=
(VIN 5V, VOUT 3.3V)  
© 2000 National Semiconductor Corporation  
DS100925  
www.national.com  
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