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參數(shù)資料
| 型號： | LM3485 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Hysteretic PFET Buck Controller |
| 中文描述： | 遲滯PFET的降壓控制器 |
| 文件頁數(shù)： | 1/15頁 |
| 文件大?。?/td> | 369K |
| 代理商： | LM3485 |
LM3485
Hysteretic PFET Buck Controller
General Description
The LM3485 is a high efficiency PFET switching regulator
controller that a system designer can use to quickly and
easily develop a small, low cost, switching buck regulator for
a wide range of applications. The use of a hysteretic control
scheme provides for simple design without any control loop
stability concerns using a wide variety of external compo-
nents. The PFET architecture also allows for low component
count as well as ultra-low dropout operation. Another benefit
is high efficiency operation at light loads without an increase
in output ripple. Current limit protection circuit is provided by
measuring the voltage across the PFET’s R
thus elimi-
nating a costly sense resistor. The current limit can be ad-
justed allowing for designs at various output currents and
costs.
Features
n
Easy to use control methodology
n
No control loop compensation required
n
4.5V to 35V wide input range
n
1.242V to V
IN
adjustable output range
n
High Efficiency 93%
n
±
1.3% (
±
2% over temp) internal reference
n
100% duty cycle
n
Maximum operating frequency
>
1MHz
n
Current limit protection
n
MSOP-8
Applications
n
Set-Top Box
n
DSL/Cable Modem
n
PC/IA
n
Auto PC
n
TFT Monitor
n
Battery Powered Portable Applications
n
Distributed Power Systems
n
Always On Power
Typical Application Circuit
20034608
May 2002
L
2002 National Semiconductor Corporation
DS200346
www.national.com
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LM3485MM | Hysteretic PFET Buck Controller |
| LM3485MMX | Hysteretic PFET Buck Controller |
| LM3488 | 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C |
| LM3488MM | 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C |
| LM3488MMX | 500kHz and 1MHz High Efficiency 1.5A Switching Regulators; Package: SO; No of Pins: 8; Temperature Range: -40?°C to 85?°C |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM3485EVAL | 功能描述:電源管理IC開發(fā)工具 LM3485MM EVAL BOARD RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LM3485LED | 制造商:Texas Instruments 功能描述: |
| LM3485LED EVAL | 功能描述:板上安裝溫度傳感器 LM3485LED EVAL Brd RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| LM3485LEDEVAL | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| LM3485MM | 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 |
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