LM2637

更新时间： 2024-11-26 00:01:07

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
Motherboard Power Supply Solution with a 5-Bit Programmable Switching Controller and Two Linear Regulator Controllers

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LM2637 数据手册

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

5-bit programmable DAC, over-current and

power

over-voltage protection, under-voltage latch-off,

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 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.

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.

DS100848

www.national.com

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与LM2637相关器件

型号	品牌	获取价格	描述	数据表
LM2637M	NSC	获取价格	Motherboard Power Supply Solution with a 5-Bit Programmable Switching Controller and Two L
LM2637M	ROCHESTER	获取价格	SWITCHING CONTROLLER, 1000kHz SWITCHING FREQ-MAX, PDSO24, SOIC-24
LM2637M/NOPB	TI	获取价格	SWITCHING CONTROLLER, 1000kHz SWITCHING FREQ-MAX, PDSO24, SOIC-24
LM2637M/NOPB	ROCHESTER	获取价格	SWITCHING CONTROLLER, 1000kHz SWITCHING FREQ-MAX, PDSO24, SOIC-24
LM2637MDC	NSC	获取价格	IC SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, UUC, DIE, Switching Regulator or Con
LM2637MWC	NSC	获取价格	IC SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, UUC, WAFER, Switching Regulator or C
LM2637MX/NOPB	TI	获取价格	SWITCHING CONTROLLER, 1000kHz SWITCHING FREQ-MAX, PDSO24, SOIC-24
LM2638	NSC	获取价格	Motherboard Power Supply Solution with a 5-Bit Programmable Switching Controller and Two L
LM2638	TI	获取价格	LM2638 Motherboard Power Supply Solution with a 5-Bit Programmable Switching Controller an
LM2638M	NSC	获取价格	Motherboard Power Supply Solution with a 5-Bit Programmable Switching Controller and Two L

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