LMR10520_14 Datasheet, PDF (1/26 Pages) Texas Instruments – SIMPLE SWITCHER 5.5Vin, 2.0A Step-Down Voltage Regulator in WSON

LMR10520
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SNVS730A – OCTOBER 2011 – REVISED OCTOBER 2011
LMR10520 SIMPLE SWITCHER^® 5.5Vin, 2.0A Step-Down Voltage Regulator in WSON
Check for Samples: LMR10520
FEATURES
1
• Input Voltage Range of 3V to 5.5V
• Output Voltage Range of 0.6V to 4.5V
• Output Current up to 2A
• 1.6MHz (LMR10520X) and 3 MHz (LMR10520Y)
Switching Frequencies
• Low Shutdown Iq, 30 nA Typical
• Internal Soft-Start
• Internally Compensated
• Current-Mode PWM Operation
• Thermal Shutdown
• WSON-6 (3 x 3 x 0.8 mm) Packaging
• Fully Enabled for WEBENCH® Power Designer
PERFORMANCE BENEFITS
• Extremely Easy to Use
• Tiny Overall Solution Reduces System Cost
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
DESCRIPTION
The LMR10520 regulator is a monolithic, high
frequency, PWM step-down DC/DC converter in 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 LMR10520 is easy to use.
The ability to drive 2.0A loads with an internal 150
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 LMR10520 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 LMR10520
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.
System Performance
Efficiency vs Load Current - "X" V_IN = 5V
100
90
80
70
60
50
1.8Vout
3.3Vout
40
0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00
LOAD CURRENT (A)
Figure 1.
Efficiency vs Load Current - "Y" V_IN = 5V
100
90
80
70
60
50
1.8Vout
3.3Vout
40
0.00 0.25 0.50 0.75 1.00 1.25 1.50 1.75 2.00
LOAD CURRENT (A)
Figure 2.
1
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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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