1 Features

• Functional Safety-Capable

– Documentation available to aid functional safety

system design

• Configured for rugged industrial applications

– 4.2V to 80V input voltage range

– 1.5A continuous output current

– Ultra-low 40μA operating quiescent current

– 200kHz to 2.2MHz adjustable switching

frequency

– Frequency synchronization to external clock

– 97 maximum duty cycle

– Supports start-up events with prebiased output

– ±1.5 reference voltage tolerance over

temperature

– Precision enable

– Easy to use with integrated compensation

network enabling low BOM count

– Integrated synchronous rectification

– 12-pin WSON wettable flank with PowerPAD™

integrated circuit package

– PFM and forced PWM (FPWM) options

– Spread Spectrum option available

• Create a custom design using the LMR38015 with

the WEBENCH® Power Designer

2 Applications

• Industrial transport

• Wireless infrastructure and networking

• Power delivery

• Factory automation and control

3 Description

The LMR38015 synchronous buck converter is

designed to regulate over a wide input voltage range,

minimizing the need for external surge suppression

components. The LMR38015 operates during input

voltage dips as low as 4.2V, at nearly 100 duty cycle

if needed, making the device an excellent choice

for wide input industrial applications and MHEV/EV

systems as the absolute maximum input voltage is

85V.

The LMR38015 features a high voltage enable pin

to enable the device by connecting the device to the

wide input supply voltage or by having precise UVLO

control across start-up and shutdown. The powergood

flag, with built-in filtering and delay, offers a

true indication of system status, eliminating the need

for an external supervisor. The device incorporates

pseudorandom spread spectrum option for minimal

EMI. The switching frequency can be configured

between 200kHz and 2.2MHz to avoid noise sensitive

frequency bands. In addition, the frequency can

be programmed through the RT pin for improved

efficiency at low operating frequencies or by having

a smaller design size at high operating frequencies.

The device has built-in protection features such as

cycle-by-cycle current limit, hiccup mode short-circuit

protection, and thermal shutdown in case of excessive

power dissipation. The LMR38015 is available in a

12-pin WSON package.