參數(shù)資料
型號(hào)： LM2674-3.3MDC
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： 1.25 A SWITCHING REGULATOR, 275 kHz SWITCHING FREQ-MAX, UUC
封裝： DIE
文件頁(yè)數(shù)： 24/31頁(yè)
文件大?。?/td> 596K
代理商： LM2674-3.3MDC
National P/N LM2674 - SIMPLE SWITCHER Power Converter High Efficiency 500mA Step-Down Voltage Regulator
The LM2674 series of regulators are monolithic integrated circuits built with a LMDMOS process. These
regulators provide all the active functions for a step-down (buck) switching regulator, capable of driving a
500 mA load current with excellent line and load regulation. These devices are available in fixed output
voltages of 3.3V, 5.0V, 12V, and an adjustable output version.
Requiring a minimum number of external components, these regulators are simple to use and include
patented internal frequency compensation (Patent Nos. 5,382,918 and 5,514,947) and a fixed frequency
oscillator.
The LM2674 series operates at a switching frequency of 260 kHz, thus allowing smaller sized filter
components than what would be needed with lower frequency switching regulators. Because of its very high
efficiency (>90%), the copper traces on the printed circuit board are the only heat sinking needed.
A family of standard inductors for use with the LM2674 are available from several different manufacturers.
This feature greatly simplifies the design of switch-mode power supplies using these advanced ICs. Also
included in the datasheet are selector guides for diodes and capacitors designed to work in switch-mode
power supplies.
Other features include a guaranteed ±1.5% tolerance on output voltage within specified input voltages and
output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring
typically 50 A stand-by current. The output switch includes current limiting, as well as thermal shutdown for
full protection under fault conditions.
To simplify the LM2674 buck regulator design procedure, there exists computer design software, LM267X
Made Simple (version 6.0).
Features
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Efficiency up to 96%
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Available in SO-8, 8-pin DIP and LLP packages
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Computer Design Software LM267X Made Simple (version 6.0)
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Simple and easy to design with
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Requires only 5 external components
q
Uses readily available standard inductors
q
3.3V, 5.0V, 12V, and adjustable output versions
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Adjustable version output voltage range: 1.21V to 37V
q
±1.5% max output voltage tolerance over line and load conditions
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Guaranteed 500mA output load current
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0.25
DMOS Output Switch
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Wide input voltage range: 8V to 40V
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260 kHz fixed frequency internal oscillator
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TTL shutdown capability, low power standby mode
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Thermal shutdown and current limit protection
Applications
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Simple High Efficiency (>90%) Step-Down (Buck) Regulator
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Efficient Pre-Regulator for Linear Regulators
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Positive-to-Negative Converter
Design Tools
file:///H|/imaging/BITTING/cpl/20020808_1/08062002_10/NATL/08062002_HTML/LM2674.html (4 of 5) [Aug-09-2002 2:45:35 PM]
相關(guān)PDF資料
PDF描述
LM2674-3.3MWC 1.25 A SWITCHING REGULATOR, 275 kHz SWITCHING FREQ-MAX, UUC
LM2674-ADJMWC 1.25 A SWITCHING REGULATOR, 275 kHz SWITCHING FREQ-MAX, UUC
LM2674-5.0MDC 1.25 A SWITCHING REGULATOR, 275 kHz SWITCHING FREQ-MAX, UUC
LM2675LDX-12EP 2.2 A SWITCHING REGULATOR, 275 kHz SWITCHING FREQ-MAX, DSO8
LM2675LDX-ADJEP 2.2 A SWITCHING REGULATOR, 275 kHz SWITCHING FREQ-MAX, DSO8
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM2674LD-12 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER Power Converter High Efficiency 500 mA Step-Down Voltage Regulator
LM2674LD-12/NOPB 功能描述:IC REG BUCK 12V 0.5A 16LLP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:SIMPLE SWITCHER® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3.3V 輸入電壓:4.5 V ~ 24 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:125mA 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 包裝:Digi-Reel® 供應(yīng)商設(shè)備封裝:SOT-6 其它名稱:MAX1836EUT33#TG16DKR
LM2674LD-3.3 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
LM2674LD-3.3/NOPB 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
LM2674LD-5.0 制造商:NSC 制造商全稱:National Semiconductor 功能描述:SIMPLE SWITCHER Power Converter High Efficiency 500 mA Step-Down Voltage Regulator
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