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LM2651_05

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
11页 630K
描述
1.5A High Efficiency Synchronous Switching Regulator

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LM2651_05 数据手册

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April 2005  
LM2651  
1.5A High Efficiency Synchronous Switching Regulator  
General Description  
Features  
n Ultra high efficiency up to 97%  
n High efficiency over a 1.5A to milliamperes load range  
n 4V to 14V input voltage range  
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 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  
n Current limit and thermal shutdown  
n 16-pin TSSOP package  
Synchronous rectification is used to achieve up to 97%  
efficiency. At light loads, the LM2651 enters a low power  
hysteretic or “sleep” mode to keep the efficiency high. In  
many applications, 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.  
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  
The LM2651 has a 300 kHz fixed frequency internal oscilla-  
tor. The high oscillator frequency allows the use of extremely  
small, low profile components.  
n Personal digital assistants (PDAs)  
n Computer peripherals  
n Battery-powered devices  
n Handheld scanners  
n High efficiency 5V conversion  
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  
10092501  
10092515  
Efficiency vs Load Current  
(VIN = 5V, VOUT = 3.3V  
© 2005 National Semiconductor Corporation  
DS100925  
www.national.com  
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