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

? Configured for rugged automotive applications

– Input voltage range: 4.2 V to 80 V

– 2-A continuous output current

– Ultra-low 40-μA operating quiescent current

– > 1.5-mm distance between VIN and GND pin

– Adjustable switching frequency from 200 kHz to

2.2 MHz

– Frequency synchronization to external clock

– Spread spectrum for reduced EMI

– 97 maximum duty cycle

– Support start-up with pre-biased output

– ±1.0 tolerance voltage reference at room

temperature

– Precision enable

– Easy to use with low BOM count

– Integrated synchronous rectification

– Internal compensation for ease of use

– 8-pin HSOIC with PowerPAD? integrated circuit

package

– PFM and forced PWM (FPWM) options

? Create a custom design using the LMR38020-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 LMR38020-Q1 synchronous buck converter is

designed to regulate over a wide input voltage range,

minimizing the need for external surge suppression

components. The LMR38020-Q1 operates during

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

duty cycle if needed, making it an excellent choice for

48-V battery automotive applications and MHEV/EV

systems.

The LMR38020-Q1 uses precision enable to provide

flexibility by enabling a direct connection to the

wide input voltage or precise control over device

start-up and shutdown. The power-good 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 for minimal EMI and switching

frequency can be configured between 200 kHz and

2.2 MHz to avoid noise sensitive frequency bands. In

addition, the frequency can be selected for improved

efficiency at low operating frequency or smaller

solution size at high operating frequency.

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 LMR38020-Q1 is qualified to

automotive AEC-Q100 grade 1 and is available in a

8-pin HSOIC PowerPAD integrated circuit package.