Texas Instruments LMR38020EVM

Overview

LMR38020EVM from Texas Instruments is an evaluation module built around the LMR38020F synchronous buck converter, configured to deliver a tightly regulated 5 V / 2 A output at 400 kHz switching frequency across a 6–80 V input range. It integrates precision enable, power-good indication (PWRGD), frequency synchronization capability, and supports pre-biased start-up for industrial power supply validation.

For engineers reviewing the LMR38020EVM datasheet, LMR38020EVM pinout, LMR38020EVM application, or LMR38020EVM equivalent, this module serves as a production-ready reference design for high-voltage DC/DC conversion in automotive, industrial, and telecom power systems - with fully assembled PCB layout, test points, and documented thermal management using 4-layer construction and PowerPAD™ thermal vias.

Technical Context

The LMR38020EVM implements a fixed-output 5 V configuration using the LMR38020F IC in an 8-pin SO PowerPAD™ package, featuring integrated high-side and low-side MOSFETs, cycle-by-cycle overcurrent protection, and 98% maximum duty cycle operation. Its input voltage range spans 4.2 V to 80 V, with output setpoint accuracy better than ±1.5% under full load and line regulation.

It supports force-PWM mode for low output ripple and tight light-load regulation, external clock synchronization via SYNC pin, and programmable UVLO through the EN pin using resistor dividers. The board includes dedicated test points (VIN_S, VO_S, Vinj) for input/output monitoring and loop response measurement.

Key Specifications

Availability

LMR38020EVM is available at Aetrix Electronics and suitable for industrial power validation, automotive subsystem prototyping, and telecom DC/DC reference design requiring stable component supply, pre-validated layout, and full documentation traceability.

Supply support for LMR38020EVM includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and high-reliability ICs for industrial, automotive, and communications markets.

The LMR38020EVM belongs to TI's SIMPLE SWITCHER® evaluation module family, designed to accelerate development of robust, high-voltage DC/DC solutions using integrated buck converters - targeting applications where reliability, thermal performance, and fast time-to-test are critical.

FAQ

What is the primary function of the LMR38020EVM?

The LMR38020EVM is a fully assembled evaluation module that demonstrates the LMR38020F synchronous buck converter in a production-ready layout. It delivers a regulated 5 V / 2 A output from 6–80 V input, supporting features like PWRGD signaling, SYNC clock injection, and programmable UVLO. Engineers use the LMR38020EVM to validate power architecture, measure efficiency, and verify thermal behavior before custom design - not as a production component.

Does the LMR38020EVM support adjustable output voltage?

No - the LMR38020EVM is factory-configured for fixed 5 V output using onboard resistor dividers and feedback network. While the underlying LMR38020F IC supports adjustable output via external resistors, this specific EVM variant does not include user-modifiable feedback components. To evaluate other output voltages, users must refer to the LMR38020F data sheet and implement custom designs - the LMR38020EVM itself is optimized for 5 V validation only.

Can the LMR38020EVM operate safely at its maximum 80 V input rating?

Yes - the LMR38020EVM is rated for continuous operation up to 80 V input, matching the absolute maximum rating of the LMR38020F IC. Its input capacitors (C9, C10: 100 V X7R), layout clearance, and thermal design have been validated per TI's safety guidelines for high-voltage evaluation modules. However, users must follow TI's HV EVM safety protocols: de-energize before probing, use isolated test equipment, and avoid contact during operation due to risk of electric shock and hot surface burn.

What is the role of the PowerPAD™ package on the LMR38020EVM's U1 IC?

The LMR38020F IC on the LMR38020EVM uses an 8-pin SO PowerPAD™ package with an exposed thermal pad soldered directly to the PCB's internal ground plane. This pad conducts heat from the die into the 4-layer board's 2-oz copper layers and thermal vias, enabling efficient dissipation during 2 A continuous operation. Proper soldering of the PowerPAD™ is essential - TI specifies minimum solder paste coverage and reflow profile to ensure thermal resistance remains below 12°C/W, which the LMR38020EVM achieves out-of-box.

How does the LMR38020EVM handle start-up with a pre-biased output?

The LMR38020EVM supports pre-biased start-up via the LMR38020F's internal circuitry - allowing the output capacitor to retain residual voltage (e.g., from another rail or hold-up capacitor) without causing reverse current or latch-up. During start-up, the controller monitors the output voltage and delays gate drive until the sensed voltage falls below the regulation threshold, then ramps up smoothly. This feature is verified on the LMR38020EVM and critical for systems with multiple power domains or hot-swap requirements.