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LM2734YMF PDF预览

LM2734YMF

更新时间: 2024-11-06 13:02:31
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
22页 455K
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LM2734YMF 数据手册

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October 2004  
LM2734  
Thin SOT23 1A Load Step-Down DC-DC Regulator  
General Description  
Features  
n Thin SOT23-6 package  
n 3.0V to 20V input voltage range  
n 0.8V to 18V output voltage range  
n 1A output current  
The LM2734 regulator is a monolithic, high frequency, PWM  
step-down DC/DC converter in a 6-pin Thin SOT23 package.  
It provides all the active functions to provide local DC/DC  
conversion with fast transient response and accurate regu-  
lation in the smallest possible PCB area.  
n 550kHz (LM2734Y) and 1.6MHz (LM2734X)  
switching frequencies  
n 300mNMOS switch  
With a minimum of external components and online design  
support through WEBENCH , the LM2734 is easy to use.  
The ability to drive 1A loads with an internal 300mNMOS  
switch using state-of-the-art 0.5µm BiCMOS technology re-  
sults in the best power density available. The world class  
control circuitry allows for on-times as low as 13ns, thus  
supporting exceptionally high frequency conversion over the  
entire 3V to 20V input operating range down to the minimum  
output voltage of 0.8V. Switching frequency is internally set  
to 550kHz (LM2734Y) or 1.6MHz (LM2734X), allowing the  
use of extremely small surface mount inductors and chip  
capacitors. Even though the operating frequencies are very  
high, efficiencies up to 90% are easy to achieve. External  
shutdown is included, featuring an ultra-low stand-by current  
of 30nA. The LM2734 utilizes current-mode control and in-  
ternal compensation to provide high-performance regulation  
over a wide range of operating conditions. Additional fea-  
tures include internal soft-start circuitry to reduce inrush  
current, pulse-by-pulse current limit, thermal shutdown, and  
output over-voltage protection.  
n 30nA shutdown current  
n 0.8V, 2% internal voltage reference  
n Internal soft-start  
n Current-Mode, PWM operation  
n WEBENCH online design tool  
Applications  
n Local Point of Load Regulation  
n Core Power in HDDs  
n Set-Top Boxes  
n Battery Powered Devices  
n USB Powered Devices  
n DSL Modems  
n Notebook Computers  
Typical Application Circuit  
Efficiency vs Load Current  
VIN = 5V, VOUT = 3.3V  
20102301  
20102345  
WEBENCH is a trademark of Transim.  
© 2004 National Semiconductor Corporation  
DS201023  
www.national.com  

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