Texas Instruments TPS5403EVM

Overview

TPS5403EVM from Texas Instruments is an evaluation module designed to demonstrate and validate the operation of the TPS5403 1.7-A, 4.5-V to 28-V input synchronous step-down DC/DC converter IC in a real-world buck configuration. It supports adjustable switching frequency (50 kHz to 120 kHz via jumper JP4), delivers 3.3 V at up to 1.7 A, and includes test points for VIN, VOUT, and LX monitoring.

For engineers reviewing the TPS5403EVM datasheet, TPS5403EVM schematic, TPS5403EVM bill of materials, or TPS5403EVM bench test setup, this module enables rapid validation of input voltage range (4.5–28 V), output regulation stability, thermal performance under load, and frequency configuration options without custom PCB design.

Technical Context

The TPS5403EVM implements the TPS5403 IC in a non-synchronous buck topology using an external Schottky rectifier (SB240E) and a discrete 82-μH power inductor (RL622-820K-RC). It provides configurable switching frequency selection via JP4 - open for 120 kHz, grounded for 50 kHz, or resistor-programmable per TPS5405 documentation.

Test points TP1–TP7 give direct access to critical nodes: VIN (JP1 input), VOUT (3.3 V output), and LX (switching node). The board uses ceramic and electrolytic capacitors (0.1 μF, 10 μF, 220 μF) for input/output filtering and compensation, aligned with TI's recommended layout for stability and EMI control.

Key Specifications

Availability

TPS5403EVM is available at Aetrix Electronics and suitable for power supply validation, DC/DC converter reference design verification, and buck regulator performance benchmarking requiring stable component supply, traceable sourcing, and documented test conditions.

Supply support for TPS5403EVM 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 decades of leadership in power conversion ICs and evaluation platforms.

The TPS5403EVM belongs to TI's evaluation module product line, engineered specifically to accelerate development and characterization of the TPS5403 step-down converter - targeting industrial power supplies, point-of-load regulation, and FPGA/CPU core voltage applications.

FAQ

What is the purpose of the TPS5403EVM?

The TPS5403EVM is an evaluation module built to demonstrate and validate the performance of the TPS5403 synchronous step-down converter IC. It enables engineers to verify key parameters - including 3.3 V output regulation, 1.7-A load capability, and 4.5–28 V input operation - under real bench conditions. The TPS5403EVM includes accessible test points, jumper-configurable frequency, and a complete, published BOM for immediate use in lab validation and design iteration.

How is switching frequency configured on the TPS5403EVM?

Switching frequency on the TPS5403EVM is set via jumper JP4: open for 120 kHz, shorted to GND for 50 kHz, or resistor-connected for intermediate values (per TPS5405 datasheet guidance). This configuration directly controls the TPS5403's oscillator timing and impacts inductor size, output ripple, and efficiency. The TPS5403EVM User's Guide (SLVU780A) documents all jumper states and corresponding frequency behavior.

Which IC does the TPS5403EVM evaluate?

The TPS5403EVM evaluates the TPS5403 - a monolithic, non-synchronous step-down DC/DC converter IC in SOIC-8 package, rated for 4.5–28 V input and delivering up to 1.7 A at fixed 3.3 V output. The TPS5403EVM replicates the reference design from TI's TPS5403 datasheet, using the exact U1 placement, component values, and layout guidelines specified for optimal performance and stability.

Does the TPS5403EVM include test points for critical nodes?

Yes, the TPS5403EVM includes dedicated test points: TP1 and TP2 (black) for VIN and VOUT, and TP5–TP7 (white) for LX, feedback, and ground connections. These allow oscilloscope probing of switching waveforms, output ripple, and loop response without soldering or modification. All test points are labeled on the silkscreen and referenced in Figure 4-1 and Table 4-1 of the TPS5403EVM User's Guide.

Can the TPS5403EVM be used to evaluate different output voltages?

The TPS5403EVM is configured for fixed 3.3 V output using onboard resistors, but it can be modified to evaluate other voltages by changing the feedback divider (R3/R6). The schematic (Figure 6-1) and BOM (Table 6-1) provide full details for such changes. Any reconfiguration requires verifying loop stability and thermal performance - guidance for which is included in the TPS5403 datasheet and the TPS5403EVM User's Guide.