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LM2637MWC

更新时间： 2024-09-08 13:09:19
品牌 Logo 应用领域
美国国家半导体 - NSC 开关控制器
页数 文件大小 规格书
18页 343K
描述
IC SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, UUC, WAFER, Switching Regulator or Controller

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中文翻译

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LM2637MWC 技术参数

生命周期：Transferred包装说明：DIE, WAFER
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.64
Is Samacsys：N模拟集成电路 - 其他类型：SWITCHING CONTROLLER
控制模式：VOLTAGE-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：5.25 V最小输入电压：4.75 V
标称输入电压：5 VJESD-30 代码：X-XUUC-N
功能数量：1封装主体材料：UNSPECIFIED
封装代码：DIE封装等效代码：WAFER
封装形状：UNSPECIFIED封装形式：UNCASED CHIP
认证状态：Not Qualified子类别：Switching Regulator or Controllers
表面贴装：YES切换器配置：PUSH-PULL
最大切换频率：1000 kHz技术：BICMOS
端子形式：NO LEAD端子位置：UPPER
Base Number Matches：1

LM2637MWC 数据手册

 浏览型号LM2637MWC的Datasheet PDF文件第2页浏览型号LM2637MWC的Datasheet PDF文件第3页浏览型号LM2637MWC的Datasheet PDF文件第4页浏览型号LM2637MWC的Datasheet PDF文件第5页浏览型号LM2637MWC的Datasheet PDF文件第6页浏览型号LM2637MWC的Datasheet PDF文件第7页 
October 1998  
LM2637  
Motherboard Power Supply Solution with a 5-Bit  
Programmable Switching Controller and Two Linear  
Regulator Controllers  
Both linear controllers have under voltage latch-off.  
General Description  
The LM2637 provides a comprehensive embedded power  
Features  
n Provides 3 regulated voltages  
n Power Good flag and output enable  
n Under-voltage latch-off  
Switching Section  
n Synchronous rectification  
supply solution for motherboards hosting high performance  
™
™
MPUs such as M II , Pentium II, K6-2 and other similar  
high performance MPUs. The LM2637 incorporates a 5-bit  
programmable, synchronous buck switching controller and  
two high-speed linear regulator controllers in a 24-pin SO  
package.  
Switching Section — The switching regulator controller fea-  
n 5-bit DAC programmable from 3.5V to 1.3V  
n Typical 1% DAC tolerance  
tures  
a
5-bit programmable DAC, over-current and  
power  
over-voltage protection, under-voltage latch-off,  
a
n Switching frequency: 50 kHz to 1 MHz  
n Two levels of over-voltage protection  
n Two methods of over-current protection  
n Adaptive non-overlapping FET gate drives  
n Soft start without external capacitor  
Linear Section  
n N-FET and NPN driving capability  
n Ultra fast response speed  
n Output voltages default to 1.5V and 2.5V yet adjustable  
good signal, and output enable. The 5-bit DAC has a typical  
tolerance of 1%. There are two user-selectable over-current  
protection methods. One provides accurate over-current pro-  
tection with the use of an external sense resistor. The other  
saves cost by taking advantage of the rDS_ON of the  
high-side FET. The over voltage protection provides two lev-  
els of protection. The first level keeps the high-side FET off  
and the low-side FET on. The second provides a gate signal  
that can be used to fire an external SCR.  
Linear Section — The two linear regulator controllers fea-  
ture wide control bandwidth, N-FET and NPN transistor driv-  
ing capability, and an adjustable output voltage. The wide  
control bandwidth makes meeting fast load transient re-  
sponse requirement such as that of the GTL+ bus an easy  
job. In minimum configuration, the two controllers default to  
1.5V and 2.5V respectively.  
Applications  
n Embedded power supplies for PC motherboards  
n Triple DC/DC power supplies  
n Programmable high current DC/DC power supply  
Pin Configuration  
24-Lead SOIC  
DS100848-1  
Top View  
NS Package Number M24B  
™
M II is a trademark of Cyrix Corporation a wholly owned subsidiary of National Semiconductor Corporation.  
™
Pentium is a trademark of Intel Corporation.  
K6 is trademark of Advanced Micro Devices, Inc.  
© 1999 National Semiconductor Corporation  
DS100848  
www.national.com  
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