1 Features

1• Input Voltage Range of 3 V to 5.5 V

• Output Voltage Range of 0.6 V to 4.5 V

• Output Current up to 1.5 A

• 1.6-MHz (LMR10515X) and 3-MHz (LMR10515Y)

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

• SOT-23 (2.92 × 2.84 × 1 mm) and

WSON (3 × 3 × 0.8 mm) Packaging

• Create a custom design using the LMR10515 with

the WEBENCH® Power Designer

2 Applications

• Point-of-Load Conversions from 3.3-V and 5-V

Rails

• Space Constrained Applications

• Battery Powered Equipment

• Industrial Distributed Power Applications

• Power Meters

• Portable Hand-Held Instruments

3 Description

The LMR10515 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 LMR10515 is

easy to use. The ability to drive 1.5-A 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 3-V to 5.5-V input operating range

down to the minimum output voltage of 0.6 V. The

LMR10515 is internally compensated, so it is simple

to use and requires few external components.

Switching frequency is internally set to 1.6 MHz, or 3

MHz, allowing the use of extremely small surface

mount inductors and chip capacitors. 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

LMR10515 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.