LMR12010_15 Datasheet, PDF (1/26 Pages) Texas Instruments – SIMPLE SWITCHER 20Vin, 1A Step-Down Voltage Regulator in SOT-23

LMR12010
www.ti.com
SNVS731A – SEPTEMBER 2011 – REVISED SEPTEMBER 2011
LMR12010 SIMPLE SWITCHER^® 20Vin, 1A Step-Down Voltage Regulator in SOT-23
Check for Samples: LMR12010
FEATURES
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•23 Input Voltage Range of 3V to 20V
• Output Voltage Range of 0.8V to 17V
• Output Current Up to 1A
• 1.6MHz (LMR12010X) and 3 MHz (LMR12010Y)
Switching Frequencies
• Low Shutdown Iq, 30 nA Typical
• Internal Soft-start
• Internally Compensated
• Current-Mode PWM Operation
• Thermal Shutdown
• Thin SOT-23-6 Package (2.97 x 1.65 x 1mm)
• Fully Enabled for WEBENCH^® Power Designer
APPLICATIONS
• Point-of-Load Conversions from 3.3V, 5V, and
12V Rails
• Space Constrained Applications
• Battery Powered Equipment
• Industrial Distributed Power Applications
• Power Meters
• Portable Hand-Held Instruments
PERFORMANCE BENEFITS
• Extremely Easy to Use
• Tiny Overall Solution Reduces System Cost
DESCRIPTION
The LMR12010 regulator is a monolithic, high
frequency, PWM step-down DC/DC converter in a 6-
pin Thin SOT-23 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 LMR12010 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 1.6 MHz (LMR12010X) or 3 MHz
(LMR12010Y), 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 LMR12010 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.
D2
V_IN
C1
ON
OFF
V_IN
BOOST
C3
SW
LMR12010
D1
EN
FB
GND
L1
V_OUT
C2
R1
R2
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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.
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 © 2011, Texas Instruments Incorporated