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LM2638MX

更新时间： 2024-11-23 12:09:43
品牌 Logo 应用领域
德州仪器 - TI 开关控制器
页数 文件大小 规格书
8页 353K
描述
LM2638 Motherboard Power Supply Solution with a 5-Bit Programmable Switching Controller and Two Linear Regulator Controllers

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LM2638MX 技术参数

是否Rohs认证： 不符合生命周期：Obsolete
包装说明：SOP, SOP24,.4Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.87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：R-PDSO-G24
JESD-609代码：e0长度：15.4 mm
湿度敏感等级：2A功能数量：1
端子数量：24封装主体材料：PLASTIC/EPOXY
封装代码：SOP封装等效代码：SOP24,.4
封装形状：RECTANGULAR封装形式：SMALL OUTLINE
峰值回流温度（摄氏度）：220认证状态：Not Qualified
座面最大高度：2.65 mm子类别：Switching Regulator or Controllers
表面贴装：YES切换器配置：SINGLE
最大切换频率：286 kHz端子面层：Tin/Lead (Sn85Pb15)
端子形式：GULL WING端子节距：1.27 mm
端子位置：DUAL处于峰值回流温度下的最长时间：30
宽度：7.5 mmBase Number Matches：1

LM2638MX 数据手册

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OBSOLETE  
LM2638  
www.ti.com  
SNVS046A –MAY 2004–REVISED NOVEMBER 2004  
LM2638 Motherboard Power Supply Solution with a 5-Bit Programmable Switching  
Controller and Two Linear Regulator Controllers  
Check for Samples: LM2638  
1
FEATURES  
– Linear Section  
•
•
•
•
N-FET and NPN drive capability  
Ultra fast response speed  
2345  
•
Provides 3 regulated voltages  
Power Good flag and output enable  
Charge pump pin  
•
•
Under voltage latch-off at 0.63V  
Output voltages default to 1.5V and 2.5V yet  
adjustable  
–
Switching Section  
•
•
•
•
•
•
•
•
Synchronous rectification  
5-bit DAC programmable down to 1.3V  
Typical ±1% DAC tolerance  
APPLICATIONS  
•
•
•
Embedded power supplies for motherboards  
Triple DC/DC power supplies  
Switching frequency: 50 kHz to 1 MHz  
Over-voltage protection  
Programmable high current DC/DC power  
supply  
Two methods of over-current protection  
Adaptive non-overlapping FET gate drives  
Soft start without external capacitor  
DESCRIPTION  
The LM2638 provides a comprehensive embedded power supply solution for motherboards hosting high  
performance MPUs such as Pentium™ II, M II™, K6™-2 and other similar high performance MPUs. The LM2638  
incorporates a 5-bit programmable, synchronous buck switching controller and two high-speed linear regulator  
controllers in a 24-pin SO package. In a typical application, the switching controller supplies the MPU core, and  
the linear regulator controllers supply the GTL+ bus and the clock or graphics chip core. A charge pump pin  
helps provide the necessary voltage to power the linear sections when 12V is shut off during system standby  
such as STR mode.  
Switching Section — The switching regulator controller features an Intel-compatible, 5-bit programmable output  
voltage, over-current and over-voltage protection, a power good signal, and a logic-controlled output enable.  
There are two user-selectable over-current protection methods. One provides accurate over-current protection  
with the use of an external sense resistor. The other saves cost by taking advantage of the rDS_ON of the high-  
side FET. When there is an over voltage, the controller turns off the high side FET and turns on the low side.  
Linear Section — The two linear regulator controllers feature wide control bandwidth, N-FET and NPN transistor  
driving capability and an adjustable output. The wide control bandwidth makes meeting the GTL+ bus transient  
response requirement an easy job. In minimum configuration, the two controllers default to 1.5V and 1.25V  
respectively.  
Both linear controllers have under voltage latch-off.  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
2
3
4
5
K6 is a trademark of Advanced Micro Devices, Inc..  
M II is a trademark of Cyrix Corporation.  
Pentium is a trademark of Intel Corporation.  
All other trademarks are the property of their respective owners.  
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2004, Texas Instruments Incorporated  
12345678

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