1 Features
1• Input Voltage Range of 3 V to 20 V
• Output Voltage Range of 0.8 V to 17 V
• Output Current up to 1 A
• 1.6 MHz (LMR12010X) and 3 MHz (LMR12010Y)
Switching Frequencies
• Low Shutdown IQ, 30 nA Typical
• Internal Soft Start
• Internally Compensated
• Current-Mode PWM Operation
• Thermal Shutdown
• Tiny Overall Solution Reduces System Cost
• Thin 6-Pin SOT-23 Package (2.97 × 1.65 × 1 mm)
• Create a custom design using the LMR12010 with
the WEBENCH® Power Designer

2 Applications
• Point-of-Load Conversions from 3.3-V, 5-V, and
12-V Rails
• Space Constrained Applications
• Battery Powered Equipment
• Industrial Distributed Power Applications
• Power Meters
• Portable Hand-Held Instruments

3 Description
The LMR12010 regulator is a monolithic, high
frequency, PWM step-down DC/DC converter in a 6-
pin thin SOT23 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 1-A loads with an
internal 300-mΩ NMOS switch using state-of-the-art
0.5-μm BiCMOS technology results in the best power
density available. The world class control circuitry
allows for on-times as low as 13 ns, thus supporting
exceptionally high frequency conversion over the
entire 3-V to 20-V input operating range down to the
minimum output voltage of 0.8 V. 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 standby
current of 30 nA. The LMR12010 utilizes currentmode
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 overvoltage protection.