1FEATURES

2? Input Voltage Range of 4.5V to 42V

? Output Voltage Range of 0.765V to 34V

? Output Current up to 0.3A

? 1.25 MHz Switching Frequency

? Low Shutdown Iq, 16 μA Typical

? Short Circuit Protected

? Internally Compensated

? Soft-Start Function

? Thin SOT-23-6 Package (2.97 x 1.65 x 1mm)

? Fully Enabled for WEBENCH? Power Designer

PERFORMANCE BENEFITS

? Tight Accuracy for Powering Digital ICs

? Extremely Easy to Use

? Tiny Overall Solution Reduces System Cost

APPLICATIONS

? Point-of-Load Conversions from 5V, 12V, and

24V Rails

? Space Constrained Applications

? Battery Powered Equipment

? Industrial Distributed Power Applications

? Power Meters

? Portable Hand-Held Instruments

DESCRIPTION

The LMR14203 is a PWM DC/DC buck (step-down)

regulator. With a wide input range from 4.5V-42V, it is

suitable for a wide range of applications such as

power conditioning from unregulated sources. They

feature a low RDSON (0.9Ω typical) internal switch for

maximum efficiency (85% typical). Operating frequency is fixed at 1.25 MHz allowing the use of

small external components while still being able to

have low output voltage ripple. Soft-start can be

implemented using the shutdown pin with an external

RC circuit allowing the user to tailor the soft-start time

to a specific application.

The LMR14203 is optimized for up to 300 mA load

current.

Additional features include: thermal shutdown, VIN

under-voltage lockout, and gate drive under-voltage

lockout. The LMR14203 is available in a low profile

SOT-6L package.