LMR10510_14 Datasheet, PDF (1/26 Pages) Texas Instruments – SIMPLE SWITCHER® 5.5Vin, 1A Step-Down Voltage Regulator in SOT-23 and WSON

LMR10510
www.ti.com
SNVS727A – OCTOBER 2011 – REVISED OCTOBER 2011
LMR10510 SIMPLE SWITCHER^® 5.5Vin, 1A Step-Down Voltage Regulator in SOT-23 and
WSON
Check for Samples: LMR10510
FEATURES
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•23 Input Voltage Range of 3V to 5.5V
• Output Voltage Range of 0.6V to 4.5V
• Output Current up to 1A
• 1.6MHz (LMR10510X) and 3 MHz (LMR10510Y)
Switching Frequencies
• Low Shutdown Iq, 30 nA Typical
• Internal Soft-Start
• Internally Compensated
• Current-Mode PWM Operation
• Thermal Shutdown
• SOT-23 (2.92 x 2.84 x 1 mm) and WSON
(3 x 3 x 0.8 mm) Packaging
• Fully Enabled for WEBENCH^® Power Designer
APPLICATIONS
• Point-of-Load Conversions from 3.3V, and 5V
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 LMR10510 regulator is a monolithic, high
frequency, PWM step-down DC/DC converter in a 5
pin SOT-23 and a 6 Pin WSON 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, the LMR10510 is
easy to use. The ability to drive 1.0A loads with an
internal 130 mΩ PMOS switch results in the best
power density available. The world-class control
circuitry allows on-times as low as 30ns, thus
supporting exceptionally high frequency conversion
over the entire 3V to 5.5V input operating range down
to the minimum output voltage of 0.6V. The
LMR10510 is a constant frequency PWM buck
regulator IC that delivers a 1.0A load current. The
regulator has a preset switching frequency of 1.6MHz
or 3.0MHz. This high frequency allows the LMR10510
to operate with small surface mount capacitors and
inductors, resulting in a DC/DC converter that
requires a minimum amount of board space. The
LMR10510 is internally compensated, so it is simple
to use and requires few external components. Even
though the operating frequency is high, efficiencies
up to 93% are easy to achieve. External shutdown is
included, featuring an ultra-low stand-by current of 30
nA. The LMR10510 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.
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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