參數(shù)資料
型號(hào)： LM2641-ADJMDC
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： DUAL SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, UUC
封裝： DIE
文件頁(yè)數(shù)： 14/22頁(yè)
文件大?。?/td> 531K
代理商： LM2641-ADJMDC
National P/N LM2641 - Dual Adjustable Step-Down Switching Power Supply Controller
LM2641MTCX-ADJ TSSOP 28 MSL
Full
production
N/A
1K+ $3.5000
reel
of
2500
[logo]UZ2T
LM2641M
TC-ADJ
LM2641-ADJ MDC
Full
production
N/A
tray
of
N/A
-
LM2641-ADJ MWC
Full
production
N/A
wafer
jar
of
N/A
-
General Description
The LM2641 is a dual step-down power supply controller intended for application in notebook personal
computers and other battery-powered equipment.
Fixed-frequency synchronous drive of logic-level N-channel power MOSFETs is combined with an optional
pulse-skipping mode to achieve ultra efficient power conversion over a 1000:1 load current range. The pulse-
skipping mode can be disabled in favor of fixed-frequency operation regardless of the load current level.
High DC gain and current-mode feedback control assure excellent line and load regulation and a wide loop
bandwidth for fast response to dynamic loads.
An internal oscillator fixes the switching frequency at 300 kHz. Optionally, switching can be synchronized to
an external clock running as fast as 400 kHz.
An optional soft-start feature limits current surges from the input power supply at start up and provides a
simple means of start-up sequencing.
Logic-level inputs allow the controllers to be turned ON and OFF separately.
Features
q
300 kHz fixed-frequency switching
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Switching synchronization with an external signal up to 400 kHz
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Optional pulse-skipping mode
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Adjustable secondary feedback
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Input undervoltage lockout
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Output undervoltage shutdown protection
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Output overvoltage shutdown protection
q
Programmable soft-start (each controller)
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5V, 50 mA linear regulator output
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Precision 2.5V reference output
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28-pin TSSOP
Key Specification
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96% efficient
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5.5 to 30V input range
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Dual outputs adjustable from 2.2 to 8V
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0.5% typical load regulation error
q
0.002%/V typical line regulation error
file:///H|/imaging/BITTING/cpl/20020808_1/08062002_10/NATL/08062002_HTML/LM2641.html (2 of 3) [Aug-09-2002 2:39:43 PM]
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM2641MTC-ADJ 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
LM2641MTC-ADJ/NOPB 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
LM2641MTCX-ADJ 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
LM2641MTCX-ADJ/NOPB 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
LM2642 制造商:未知廠家 制造商全稱:未知廠家 功能描述:
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