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| 型号： | LM2637MDC |
| 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： | DIE |
| 文件页数： | 1/20页 |
| 文件大小： | 404K |
| 代理商： | LM2637MDC |
LM2637
Motherboard Power Supply Solution with a 5-Bit
Programmable Switching Controller and Two Linear
Regulator Controllers
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 fea-
tures
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 pro-
tection with the use of an external sense resistor. The other
saves cost by taking advantage of the r
DS_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.
Both linear controllers have under voltage latch-off.
Features
n Provides 3 regulated voltages
n Power Good flag and output enable
n Under-voltage latch-off
Switching Section
n Synchronous rectification
n 5-bit DAC programmable from 3.5V to 1.3V
n Typical 1% DAC tolerance
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
Applications
n Embedded power supplies for PC motherboards
n Triple DC/DC power supplies
n Programmable high current DC/DC power supply
Pin Configuration
MII 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.
24-Lead SOIC
DS100848-1
Top View
NS Package Number M24B
October 1998
LM2637
Motherboard
Power
Supply
Solution
with
a
5-Bit
Programmable
Switching
Controller
and
T
w
o
Linear
Regulator
Controllers
1999 National Semiconductor Corporation
DS100848
www.national.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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