Texas Instruments LMR24220EVAL/NOPB

Overview

LMR24220EVAL/NOPB from Texas Instruments is an evaluation board designed to validate the LMR24220 42V, 2A synchronous step-down DC/DC regulator in real-world buck converter applications. It delivers a fixed 3.3V output at up to 2.0A, operates from 4.5V–42V input, uses a 500kHz switching frequency, and supports all-ceramic output capacitance without ESR dependency-enabling compact, low-component-count power designs for automotive and industrial power conditioning.

For engineers reviewing the LMR24220EVAL/NOPB datasheet, LMR24220EVAL/NOPB pinout, LMR24220EVAL/NOPB application, or LMR24220EVAL/NOPB equivalent, this board provides immediate functional validation of transient response, efficiency across input voltage ranges (4.5V–42V), load regulation (±0.5% over 0–2A), startup behavior, and CCM/DCM switching waveforms-critical for rapid prototyping of high-vin buck converters.

Technical Context

The LMR24220EVAL/NOPB implements the LMR24220 IC using Constant On-Time (COT) control architecture, eliminating need for external loop compensation while delivering fast load transient response. Its schematic integrates a 8.2µH shielded inductor (DR74-8R2-R), optimized ceramic input/output capacitors (including 10µF/50V and 47µF/10V X5R types), and configurable EN logic interface with optional zener clamping.

Board-level design supports output voltage adjustment via feedback resistor network (V_FB = 0.8V), test points for SW, VIN, VOUT, EN, and GND, and provisions for optional bulk input capacitance (C8), additional output capacitance (C7), and enable threshold setting (R4/R5/D1). Layout follows TI's micro SMD layout guidelines with dedicated power planes and thermal relief.

Key Specifications

Availability

LMR24220EVAL/NOPB is available at Aetrix Electronics and suitable for automotive infotainment power rails, industrial sensor node DC/DC conversion, and 42V input battery-powered equipment requiring stable component supply and rapid design verification.

Supply support for LMR24220EVAL/NOPB 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies with broad industrial, automotive, and communications applications.

The LMR24220EVAL/NOPB belongs to TI's SIMPLE SWITCHER® evaluation board family, engineered specifically to accelerate development of high-input-voltage buck regulators by providing validated reference layouts, measurable performance data, and flexible configuration options for system-level power validation.

FAQ

What is the primary purpose of the LMR24220EVAL/NOPB?

The LMR24220EVAL/NOPB is a fully assembled evaluation board designed to demonstrate and validate the electrical performance of the LMR24220 42V, 2A synchronous step-down regulator. It enables engineers to verify key parameters-including efficiency, load/transient response, startup behavior, and thermal performance-without designing a custom PCB. The board ships with default 3.3V output and supports quick reconfiguration for other output voltages using the feedback resistor network.

Does the LMR24220EVAL/NOPB support adjustable output voltage?

Yes, the LMR24220EVAL/NOPB supports output voltage adjustment from 3.3V to other values using the onboard feedback resistors R1 and R2 per the equation V_OUT = 0.8V × (1 + R1/R2). The default configuration sets 3.3V, but R1 and R2 are 0603 chip resistors that can be replaced to achieve target output voltages while maintaining stability with all-ceramic output capacitors.

What input voltage range is validated on the LMR24220EVAL/NOPB?

The LMR24220EVAL/NOPB is validated across the full 4.5V to 42V input range specified for the LMR24220 IC. Performance data-including efficiency curves, load regulation, and transient response-is documented in the user's guide for multiple input voltages (4.5V, 5V, 9V, 12V, 24V, 36V, and 42V), confirming robust operation under automotive cold-crank and industrial unregulated supply conditions.

Can the LMR24220EVAL/NOPB be used for production systems?

No-the LMR24220EVAL/NOPB is intended solely for research, development, and feasibility evaluation per TI's evaluation module terms. It is not qualified for use in finished products, consumer devices, or safety-critical applications. Engineers must design and qualify their own production PCBs based on TI's layout recommendations, thermal guidelines, and reliability requirements before deployment.

How is enable/disable functionality implemented on the LMR24220EVAL/NOPB?

The LMR24220EVAL/NOPB provides three enable options: (1) leave EN pin floating for automatic startup at internal UVLO (~4.2V), (2) short EN to GND via test point T3 to disable, or (3) install optional R4/R5/D1 to set a custom enable threshold (e.g., >1.26V on EN). This allows flexible integration with system power sequencing, microcontroller GPIO, or external logic signals during validation.