LM2734 Datasheet, PDF (1/31 Pages) National Semiconductor (TI) – Thin SOT23 1A Load Step-Down DC-DC Regulator

LM2734
www.ti.com
SNVS288I – SEPTEMBER 2004 – REVISED APRIIL 2013
LM2734 Thin SOT 1A Load Step-Down DC-DC Regulator
Check for Samples: LM2734
FEATURES
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•234 Thin SOT-6 Package
• 3.0V to 20V Input Voltage Range
• 0.8V to 18V Output Voltage Range
• 1A Output Current
• 550kHz (LM2734Y) and 1.6MHz (LM2734X)
Switching Frequencies
• 300mΩ NMOS Switch
• 30nA Shutdown Current
• 0.8V, 2% Internal Voltage Reference
• Internal Soft-Start
• Current-Mode, PWM Operation
• WEBENCH^® Online Design Tool
• Thermal Shutdown
• LM2734XQ/LM2734YQ are AEC-Q100 Grade 1
Qualified and are Manufactured on an
Automotive Grade Flow
APPLICATIONS
• Local Point of Load Regulation
• Core Power in HDDs
• Set-Top Boxes
• Battery Powered Devices
• USB Powered Devices
• DSL Modems
• Notebook Computers
• Automotive
DESCRIPTION
The LM2734 regulator is a monolithic, high frequency,
PWM step-down DC/DC converter in a 6-pin Thin
SOT package. It provides all the active functions to
provide local DC/DC conversion with fast transient
response and accurate regulation in the smallest
possible PCB area.
With a minimum of external components and online
design support through WEBENCH^®, the LM2734 is
easy to use. The ability to drive 1A loads with an
internal 300mΩ NMOS switch using state-of-the-art
0.5µm BiCMOS technology results in the best power
density available. The world class control circuitry
allows for on-times as low as 13ns, thus supporting
exceptionally high frequency conversion over the
entire 3V to 20V input operating range down to the
minimum output voltage of 0.8V. Switching frequency
is internally set to 550kHz (LM2734Y) or 1.6MHz
(LM2734X), allowing the use of extremely small
surface mount inductors and chip capacitors. Even
though the operating frequencies are very high,
efficiencies up to 90% are easy to achieve. External
shutdown is included, featuring an ultra-low stand-by
current of 30nA. The LM2734 utilizes current-mode
control and internal compensation to provide high-
performance regulation over a wide range of
operating conditions. Additional features include
internal soft-start circuitry to reduce inrush current,
pulse-by-pulse current limit, thermal shutdown, and
output over-voltage protection.
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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.
WEBENCH is a registered trademark of Texas Instruments, Inc..
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WEBENCH is a registered trademark 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 © 2004–2013, Texas Instruments Incorporated