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National P/N LM2675 - SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage Regulator
The LM2675 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 1A
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 LM2675 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 LM2675 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 LM2675 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
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Uses readily available standard inductors
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3.3V, 5.0V, 12V, and adjustable output versions
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Adjustable version output voltage range: 1.21V to 37V
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±1.5% max output voltage tolerance over line and load conditions
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Guaranteed 1A 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/LM2675.html (4 of 5) [Aug-09-2002 2:46:40 PM]
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相关代理商/技术参数
LM2675-5.0EVAL 功能描述:电源管理IC开发工具 LM2675-5.0 EVAL BOARD RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
LM2675-5.0EVAL/NOPB 制造商:National Semiconductor Corporation 功能描述:Semi,Regulator,Eval
LM2675EP 制造商:NSC 制造商全称:National Semiconductor 功能描述:Enhanced Plastic SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage Regulator
LM2675LD-12 制造商:NSC 制造商全称:National Semiconductor 功能描述:SIMPLE SWITCHER Power Converter High Efficiency 1A Step-Down Voltage Regulator
LM2675LD-12/NOPB 功能描述:IC REG BUCK 12V 1A 16LLP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:SIMPLE SWITCHER® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:3.3V 输入电压:4.5 V ~ 24 V PWM 型:- 频率 - 开关:- 电流 - 输出:125mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 包装:Digi-Reel® 供应商设备封装:SOT-6 其它名称:MAX1836EUT33#TG16DKR
LM2675LD-3.3 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述:
LM2675LD-3.3/NOPB 功能描述:IC REG BUCK 3.3V 1A 16LLP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:SIMPLE SWITCHER® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:1 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:3.3V 输入电压:4.5 V ~ 24 V PWM 型:- 频率 - 开关:- 电流 - 输出:125mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 包装:Digi-Reel® 供应商设备封装:SOT-6 其它名称:MAX1836EUT33#TG16DKR
LM2675LD-5.0 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT