LM3151_15 Datasheet, PDF (1/26 Pages) Texas Instruments – LM3151/LM3152/LM3153 SIMPLE SWITCHER® CONTROLLER, High Input Voltage Synchronous Step-Down

LM3151, LM3152, LM3153
www.ti.com
SNVS562G – SEPTEMBER 2008 – REVISED MARCH 2011
LM3151/LM3152/LM3153 SIMPLE SWITCHER^® CONTROLLER, High Input Voltage
Synchronous Step-Down
Check for Samples: LM3151, LM3152, LM3153
FEATURES
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•234 PowerWise™ Step-down Controller
• 6V to 42V Wide Input Voltage Range
• Fixed Output Voltage of 3.3V
• Fixed Switching Frequencies of 250 kHz/500
kHz/750 kHz
• No Loop Compensation Required
• Fully WEBENCH^® Enabled
• Low External Component Count
• Constant On-Time Control
• Ultra-Fast Transient Response
• Stable with Low ESR Capacitors
• Output Voltage Pre-bias Startup
• Valley Current Limit
• Programmable Soft-start
TYPICAL APPLICATIONS
• Telecom
• Networking Equipment
• Routers
• Security Surveillance
• Power Modules
DESCRIPTION
The LM3151/2/3 SIMPLE SWITCHER Controller is an
easy to use and simplified step down power controller
capable of providing up to 12A of output current in a
typical application. Operating with an input voltage
range from 6V-42V, the LM3151/2/3 features a fixed
output voltage of 3.3V, and features switching
frequencies of 250 kHz, 500 kHz, and 750 kHz. The
synchronous architecture provides for highly efficient
designs. The LM3151/2/3 controller employs a
Constant On-Time (COT) architecture with a
proprietary Emulated Ripple Mode (ERM) control that
allows for the use of low ESR output capacitors,
which reduces overall solution size and output
voltage ripple. The Constant On-Time (COT)
regulation architecture allows for fast transient
response and requires no loop compensation, which
reduces external component count and reduces
design complexity.
Fault protection features such as thermal shutdown,
under-voltage lockout, over-voltage protection, short-
circuit protection, current limit, and output voltage pre-
bias startup allow for a reliable and robust solution.
The LM3151/2/3 SIMPLE SWITCHER concept
provides for an easy to use complete design using a
minimum number of external components and TI’s
WEBENCH online design tool. WEBENCH provides
design support for every step of the design process
and includes features such as external component
calculation with a new MOSFET selector, electrical
simulation, thermal simulation, and Build-It boards for
prototyping.
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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.
PowerWise is a trademark of Texas Instruments.
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SIMPLE SWITCHER, WEBENCH are registered trademarks of Texas Instruments.
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All other trademarks are the property of their respective owners.
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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 © 2008–2011, Texas Instruments Incorporated