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參數(shù)資料
| 型號： | LM2637MWC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, UUC |
| 封裝： | WAFER |
| 文件頁數(shù)： | 11/20頁 |
| 文件大?。?/td> | 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
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LM2637 MWC
Full production
N/A
wafer
jar
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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
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Under-voltage latch-offSwitching Section
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Synchronous rectification
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5-bit DAC programmable from 3.5V to 1.3V
q
Typical 1% DAC tolerance
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Switching frequency: 50 kHz to 1 MHz
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Two levels of over-voltage protection
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Two methods of over-current protection
q
Adaptive non-overlapping FET gate drives
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Soft start without external capacitorLinear Section
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N-FET and NPN driving capability
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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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| LM2637MX/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:- 應用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:37 系列:- 應用: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 供應商設備封裝:56-TQFN-EP（8x8） 包裝:管件 |
| 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:- 應用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:37 系列:- 應用: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 供應商設備封裝: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:- 應用說明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:37 系列:- 應用: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 供應商設備封裝:56-TQFN-EP（8x8） 包裝:管件 |
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