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參數(shù)資料
| 型號： | LM2637M/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO24 |
| 封裝： | SOIC-24 |
| 文件頁數(shù)： | 1/17頁 |
| 文件大小： | 803K |
| 代理商： | LM2637M/NOPB |
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 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 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
24-Lead SOIC
10084801
Top View
NS Package Number M24B
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.
November 2004
LM2637
Motherboard
Power
Supply
Solution
with
a
5-Bit
Programmable
Switching
Controller
and
T
w
o
Linear
Regulator
Controllers
2004 National Semiconductor Corporation
DS100848
www.national.com
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| LM2638 | 制造商:未知廠家 制造商全稱:未知廠家 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 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應(yīng)用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件 |
| LM2638MX | 功能描述:IC MOTHERBRD PWR SUPPLY 24-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應(yīng)用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件 |
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