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LM3485Q1MM Scheda tecnica(PDF) 1 Page - Texas Instruments

Il numero della parte LM3485Q1MM
Spiegazioni elettronici  Hysteretic PFET Buck Controller
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LM3485Q1MM Scheda tecnica(HTML) 1 Page - Texas Instruments

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


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