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参数资料
| 型号： | LM2637MWC |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, UUC |
| 封装： | WAFER |
| 文件页数： | 11/20页 |
| 文件大小： | 404K |
| 代理商： | LM2637MWC |
National P/N LM2637 - Motherboard Power Supply Solution with a 5-Bit Programmable Switching Controller and Two Linear Regulator Controllers
LM2637M
24 MSL Full production
N/A
1K+
$2.1000
rail
of
30
[logo]UZ2T
LM2637M
LM2637MX
24 MSL Full production
N/A
1K+
$2.1000
reel
of
1000
[logo]UZ2T
LM2637M
LM2637 MDC
Full production
N/A
N/A Samples
tray
of
N/A
-
LM2637 MWC
Full production
N/A
wafer
jar
of
N/A
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General Description
The LM2637 provides a comprehensive embedded power 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 features a 5-bit programmable DAC, over-current and
over-voltage protection, under-voltage latch-off, a power 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 protection with the use of an external sense resistor. The other saves cost by taking
advantage of the rDS[lowbar]ON of the high-side FET. The over voltage protection provides two levels 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 feature wide control bandwidth, N-FET and NPN
transistor driving capability, and an adjustable output voltage. The wide control bandwidth makes meeting
fast load transient response 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.
Both linear controllers have under voltage latch-off.
Features
q
Provides 3 regulated voltages
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Power Good flag and output enable
q
Under-voltage latch-offSwitching Section
q
Synchronous rectification
q
5-bit DAC programmable from 3.5V to 1.3V
q
Typical 1% DAC tolerance
q
Switching frequency: 50 kHz to 1 MHz
q
Two levels of over-voltage protection
q
Two methods of over-current protection
q
Adaptive non-overlapping FET gate drives
q
Soft start without external capacitorLinear Section
q
N-FET and NPN driving capability
q
Ultra fast response speed
q
Output voltages default to 1.5V and 2.5V yet adjustable
Applications
file:///H|/imaging/BITTING/cpl/20020808_1/08062002_10/NATL/08062002_HTML/LM2637.html (2 of 3) [Aug-09-2002 2:38:28 PM]
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相关代理商/技术参数 |
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| LM2637MX/NOPB | 功能描述:IC MOTHERBRD PWR SUPPLY 24-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
| LM2638 | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
| LM2638M | 制造商:Texas Instruments 功能描述: |
| LM2638M/NOPB | 功能描述:IC MOTHERBRD PWR SUPPLY 24-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
| LM2638MX | 功能描述:IC MOTHERBRD PWR SUPPLY 24-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
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