Texas Instruments LM20144EVAL

Overview

LM20144EVAL from Texas Instruments is an evaluation board for the LM20144 4-A synchronous buck regulator, designed to demonstrate stable 1.2-V output at 1 MHz switching frequency from a 5-V input. It features optimized power stage layout, dual-layer PCB (1.3" × 1.1"), and supports input range 2.95–5.5 V with cycle-by-cycle current limit and PGOOD monitoring.

For engineers reviewing the LM20144EVAL datasheet, LM20144EVAL pinout, LM20144EVAL application, or LM20144EVAL equivalent, this board enables rapid validation of LM20144 performance in point-of-load DC/DC conversion, transient response testing, compensation tuning, and sequencing verification under real-world thermal and layout constraints.

Technical Context

The LM20144EVAL implements the LM20144 IC in a fixed 1.2-V configuration using RFB1 = 4.99 kΩ and RFB2 = 10 kΩ, with RT = 100 kΩ setting f_SW = 1 MHz. Compensation uses CC1 = 3.3 nF and RC1 = 3.09 kΩ to stabilize the control loop across full VIN/VOUT ranges.

Input filtering combines a 100-µF bulk capacitor (GRM32ER60J107ME20) and 1-µF high-frequency bypass (GRM188R60J105KA01); output uses identical 100-µF ceramic capacitance with ~2-mΩ ESR. The AVIN RC filter (RF = 1 Ω, CF = 100 nF) suppresses PVIN noise coupling into analog circuitry.

Key Specifications

Availability

LM20144EVAL is available at Aetrix Electronics and suitable for DC/DC converter validation, power supply design prototyping, and buck regulator training requiring stable component supply, traceable sourcing, and documented reference performance.

Supply support for LM20144EVAL 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, embedded processing, and power management technologies, with over 90 years of innovation in industrial, automotive, and consumer electronics.

The LM20144EVAL belongs to TI's Power Management Evaluation Platform family, engineered to accelerate adoption of the LM20144 buck regulator in space-constrained, high-efficiency point-of-load applications demanding fast transient response and robust fault protection.

FAQ

What is the primary function of the LM20144EVAL evaluation board?

The LM20144EVAL evaluation board is a fully assembled, tested reference design that demonstrates the operation and performance of the LM20144 4-A synchronous buck regulator. It provides immediate access to key signals-including VIN, VOUT, EN, SS/TRK, PGOOD, and COMP-for measurement, loop analysis, and application-specific tuning without custom PCB development. The LM20144EVAL enables engineers to validate efficiency, load/transient response, and stability before committing to final system design.

Can the output voltage of the LM20144EVAL be adjusted, and how?

Yes, the LM20144EVAL output voltage is adjustable by replacing RFB1 (4.99 kΩ) while retaining RFB2 (10 kΩ). Using the formula V_OUT = 0.8 V × (1 + RFB1/RFB2), changing RFB1 to 7.15 kΩ sets V_OUT = 1.36 V, and 2.49 kΩ yields 1.0 V. The LM20144EVAL schematic and layout support this modification without requiring board rework-only resistor replacement is needed to achieve precise output voltages down to 0.8 V.

What are the key layout features of the LM20144EVAL that support thermal and EMI performance?

The LM20144EVAL uses a compact two-layer PCB with all components on the top layer and a solid ground plane on the bottom layer to minimize parasitic inductance and improve heat dissipation. The exposed pad of the LM20144 (U1) connects directly to the ground plane via multiple thermal vias, enhancing thermal resistance. Critical high-current paths-including PVIN-to-SW, SW-to-PGND, and PGND-to-CIN-are kept short and wide, reducing switching noise and improving EMI behavior during 1-MHz operation.

Does the LM20144EVAL include provisions for control loop compensation tuning?

Yes, the LM20144EVAL provides accessible test points and unpopulated footprints for active compensation components: CC1 (3.3 nF), RC1 (3.09 kΩ), and CC2 (open). Engineers can modify CC1 and RC1 values to adjust crossover frequency and phase margin, or populate CC2 to add a high-frequency pole when using higher-ESR output capacitors. This flexibility allows direct measurement of loop gain and phase using network analyzers, making the LM20144EVAL ideal for control loop education and optimization.

How does the LM20144EVAL handle enable and power-good signaling?

The LM20144EVAL routes the EN pin to a dedicated test point and defaults it to VIN through an onboard jumper, ensuring automatic startup. For sequencing, EN can be driven externally above 1.18 V (typ). PGOOD is pulled up to VIN via RPG = 10 kΩ and routed to a test point; its open-drain output asserts high when VOUT is within ±7.5% of regulation and UVLO/OVP conditions are cleared. This implementation lets users integrate the LM20144EVAL into multi-rail systems requiring strict power sequencing and status monitoring.