LMR38020
SNVSC40B – AUGUST 2021 – REVISED NOVEMBER 2021
LMR38020 SIMPLE SWITCHER® 4.2-V to 80-V, 2-A Synchronous Buck Converter with
40-µA IQ
1 Features
3 Description
•
•
Functional Safety-Capable
– Documentation available to aid functional safety
system design
Configured for rugged industrial 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 option for reduced EMI
– 97% maximum duty cycle
– Support start-up with pre-biased output
– ±1.0% tolerance voltage reference at room
temperature
The LMR38020 synchronous buck converter is
designed to regulate over a wide input voltage range,
minimizing the need for external surge suppression
components. The LMR38020 operates during input
voltage dips as low as 4.2 V, at nearly 100% duty
cycle if needed, making it an excellent choice for wide
input industrial applications and MHEV/EV systems.
The LMR38020 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 pseudo-random
spread spectrum form 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.
– Precision enable
– Easy to use with low BOM count
– Integrated synchronous rectification
– Internal compensation for ease of use
– 8-pin HSOIC with PowerPAD™ package
– PFM and forced PWM (FPWM) options
Create a custom design using the LMR38020 with
the WEBENCH® Power Designer
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 is available in a
8-pin HSOIC PowerPAD™ package.
•
2 Applications
•
•
•
•
Industrial transport
Wireless infrastructure and networking
Power delivery
Device Information
PART NUMBER
PACKAGE(1)
BODY SIZE (NOM)
LMR38020
HSOIC (8)
4.89 mm × 3.90 mm
Factory automation and control
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
BOOT
VIN
CIN
VIN
EN
CBOOT
VOUT
COUT
SW
L1
PGND
PG
FB
RT/SYNC
RFBT
RT
RFBB
Simplified Schematic
Efficiency vs Output Current VOUT = 5 V, 400 kHz
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
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