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LM22670TJE-5.0

更新时间： 2024-11-11 05:41:59
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
18页 476K
描述
3A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Synchronization or Adjustable Switching Frequency

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LM22670TJE-5.0 数据手册

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November 21, 2008  
LM22670  
3A SIMPLE SWITCHER®, Step-Down Voltage Regulator  
with Synchronization or Adjustable Switching Frequency  
General Description  
Features  
The LM22670 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.  
High efficiency (>90%) is obtained through the use of a low  
ON-resistance N-channel MOSFET. The series consists of a  
fixed 5V output and an adjustable version.  
Wide input voltage range: 4.5V to 42V  
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■
■
■
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Internally compensated voltage mode control  
Stable with low ESR ceramic capacitors  
120 mΩ N-channel MOSFET TO-263 THIN package  
100 mΩ N-channel MOSFET PSOP-8 package  
Output voltage options:  
-ADJ (outputs as low as 1.285V)  
-5.0 (output fixed to 5V)  
The SIMPLE SWITCHER® concept provides for an easy to  
use complete design using a minimum number of external  
components and National’s WEBENCH® design tool.  
National’s WEBENCH® tool includes features such as exter-  
nal component calculation, electrical simulation, thermal sim-  
ulation, and Build-It boards for easy design-in. The switching  
clock frequency is provided by an internal fixed frequency os-  
cillator which operates at 500 kHz. The switching frequency  
can also be adjusted with an external resistor or synchronized  
to an external clock up to 1MHz. It is also possible to self-  
synchronize multiple regulators to share the same switching  
frequency. The LM22670 series also has built in thermal shut-  
down, current limiting and an enable control input that can  
power down the regulator to a low 25 µA quiescent current  
standby condition.  
±1.5% feedback reference accuracy  
■
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Switching frequency of 500 kHz, adjustable between 200  
kHz and 1 MHz  
-40°C to 125°C operating junction temperature range  
Precision enable pin  
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Integrated boot diode  
Integrated soft-start  
Fully WEBENCH® enabled  
Step-down and inverting buck-boost applications  
Package  
PSOP-8 (Exposed Pad)  
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TO-263 THIN (Exposed Pad)  
Applications  
Industrial Control  
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Telecom and Datacom Systems  
Embedded Systems  
Automotive Telematics and Body Electronics  
Conversions from Standard 24V, 12V and 5V Input Rails  
■
Simplified Application Schematic  
30076001  
© 2008 National Semiconductor Corporation  
300760  
www.national.com  
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LM22670TJE-5.0 替代型号

型号 品牌 替代类型 描述 数据表
LM22670TJ-5.0 TI

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