1 Features
• AEC-Q100 qualified for automotive applications
– Temperature grade 1: –40°C to +125°C, TA
• Functional Safety-Capable
– Documentation available to aid functional safety
system design
• Configured for rugged automotive applications
– 4.2-V to 80-V input voltage range
– 2-A continuous output current
– Ultra-low 40-μA operating quiescent current
– > 1.5-mm distance between VIN and GND pin
– 200-kHz to 2.2-MHz adjustable switching
frequency
– 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 device with integrated
compensation network enabling low BOM count
– Integrated synchronous rectification
– 8-pin HSOIC with PowerPAD™ integrated circuit
package
– PFM and forced PWM (FPWM) options
– Available in 1-A, LMR38010-Q1
• 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 the device 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 an
8-pin HSOIC PowerPAD integrated circuit package.