Texas Instruments LMR38020Q | Demoboard LMR38020QEVM User Guide

Description

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 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 is available in a 8-pin HSOIC PowerPAD package.

Features

• 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
• 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

Typical applications

• Power delivery
• Wireless infrastructure and networking
• Industrial transport, Factory automation and control

More information

• Datasheet
• IC product information