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LM3485Q1MM-NOPB PDF预览

LM3485Q1MM-NOPB

更新时间: 2024-11-26 12:04:39
品牌 Logo 应用领域
德州仪器 - TI 控制器
页数 文件大小 规格书
23页 1030K
描述
Hysteretic PFET Buck Controller

LM3485Q1MM-NOPB 数据手册

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LM3485  
www.ti.com  
SNVS178G JANUARY 2002REVISED FEBRUARY 2013  
Hysteretic PFET Buck Controller  
Check for Samples: LM3485  
1
FEATURES  
DESCRIPTION  
The LM3485 is a high efficiency PFET switching  
regulator controller that can be used to quickly and  
easily develop a small, low cost, switching buck  
regulator for a wide range of applications. The  
hysteretic control architecture provides for simple  
design without any control loop stability concerns  
using a wide variety of external components. The  
PFET architecture also allows for low component  
count as well as ultra-low dropout, 100% duty cycle  
operation. Another benefit is high efficiency operation  
at light loads without an increase in output ripple.  
2
Easy to Use Control Methodology  
No Control Loop Compensation Required  
4.5V to 35V Wide Input Range  
1.242V to VIN Adjustable Output Range  
High Efficiency 93%  
±1.3% (±2% Over Temp) Internal Reference  
100% Duty Cycle  
Maximum Operating Frequency > 1MHz  
Current Limit Protection  
Current limit protection is provided by measuring the  
voltage across the PFET’s RDS(ON), thus eliminating  
the need for a sense resistor. The cycle-by-cycle  
current limit can be adjusted with a single resistor,  
ensuring safe operation over a range of output  
currents.  
VSSOP-8  
APPLICATIONS  
Set-Top Box  
DSL or Cable Modem  
PC/IA  
Auto PC  
TFT Monitor  
Battery Powered Portable Applications  
Distributed Power Systems  
Always On Power  
Typical Application Circuit  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.  
All trademarks are the property of their respective owners.  
2
PRODUCTION DATA information is current as of publication date.  
Products conform to specifications per the terms of the Texas  
Instruments standard warranty. Production processing does not  
necessarily include testing of all parameters.  
Copyright © 2002–2013, Texas Instruments Incorporated  

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