1 Features

? AEC-Q100 qualified for automotive applications

– Temperature grade 1: –40°C to +150°C, TJ

? Functional Safety-Capable

– Documentation available to aid functional safety

system design

? Designed for Low EMI requirements

– Spread spectrum option for reduced peak

emissions

– Low package parasitics facilitating CIPR25

class 5 compliance

? Configured for rugged applications

– 4.2-V to 80-V input voltage range

– 1.5-A continuous output current

– Ultra-low 40-μA operating quiescent current

– 200-kHz to 2.2-MHz 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

? Create a custom design using the LMR38015-Q1

with the WEBENCH? Power Designer

2 Applications

? Automotive inverter and motor control

? Automotive DC/DC converters

? Automotive battery management system

? Automotive 48-V mild hybrid ECU bias supplies

3 Description

The LMR38015-Q1 synchronous buck converter is

designed to regulate over a wide input voltage range,

minimizing the need for external surge suppression

components. The LMR38015-Q1 operates during

input voltage dips as low as 4.2 V, at nearly 100

duty cycle if needed, making the device an excellent

choice for 48-V battery automotive applications and

MHEV/EV systems as the absolute maximum input

voltage is 85 V.

The LMR38015-Q1 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 200 kHz and 2.2 MHz 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-Q1 is qualified to

automotive AEC-Q100 grade 1 and is available in a

12-pin WSON package.