Texas Instruments TPS54318RTER

Overview

TPS54318RTER from Texas Instruments is a 2.95-V to 6-V input, 3-A synchronous step-down DC/DC converter with integrated high- and low-side 30-mΩ MOSFETs, 2-MHz switching frequency capability, ±1% voltage reference accuracy over –40°C to 150°C, and thermally enhanced 3 mm × 3 mm WQFN-16 package. It delivers point-of-load regulation for FPGAs and microprocessors in space-constrained industrial and telecom systems.

For engineers reviewing the TPS54318RTER datasheet, TPS54318RTER pinout, TPS54318RTER application, or TPS54318RTER equivalent, this page provides verified functional context, validated pin roles, confirmed thermal and efficiency behavior at 1.8 V/3 A, and real-world soft-start and power-good timing constraints - all directly traceable to TI's SLVS975C production datasheet.

Technical Context

The TPS54318RTER implements peak-current-mode control with internal slope compensation to prevent subharmonic oscillation across 0–100% duty cycle. Its RT/CLK pin supports both resistor-programmed (200–2000 kHz) and external clock-synchronized operation with PLL lock-in time of 14 μs.

It integrates boot diode recharge logic and BOOT-PH UVLO (2.1 V min), enabling near-100% duty-cycle operation. The error amplifier features dual transconductance modes: 225 μS during regulation and 70 μS during soft-start, with COMP pin clamping for transient response control and current limiting.

Key Specifications

Pinout & Package

TPS54318RTER uses a thermally enhanced 3 mm × 3 mm, 16-pin WQFN package with exposed PowerPad (GND-connected) for optimal junction-to-board thermal resistance (7.9°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck converter applications.

Compared with TPS54318RTER, TPS54319RTER improves reference and enable accuracy but sacrifices clock synchronization, while MP2338HGRT-Z reduces feature set and thermal robustness to lower cost - making TPS54318RTER the balanced choice for industrial FPGA and telecom point-of-load designs requiring flexibility, reliability, and thermal resilience.

Availability

TPS54318RTER is available at Aetrix Electronics and suitable for FPGA core supplies, industrial PLC I/O modules, optical line card biasing, and 5G small cell radio front-end power delivery requiring stable component supply, long-term lifecycle support, and consistent parametric performance.

Supply support for TPS54318RTER 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 leader specializing in analog, embedded processing, and power management ICs, with decades of expertise in high-efficiency DC/DC conversion and automotive-grade reliability.

The TPS54318RTER belongs to TI's SWIFT™ synchronous buck converter family, designed specifically for high-density, thermally constrained point-of-load applications in networking, telecom, and industrial automation where integration, efficiency, and thermal performance are critical.

FAQ

What is the maximum supported switching frequency for the TPS54318RTER?

The TPS54318RTER supports up to 2 MHz switching frequency in both resistor-programmed (RT mode) and external clock-synchronized (CLK mode). At 2 MHz, it enables use of sub-2.2 μH inductors and low-ESR ceramic capacitors, reducing solution size significantly compared to 500 kHz alternatives - a key advantage in space-limited 5G and optical modules where the TPS54318RTER is commonly deployed.

Does the TPS54318RTER support power supply sequencing with other rails?

Yes, the TPS54318RTER supports controlled sequencing via its SS (soft-start) pin and EN (enable) pin. An external capacitor on SS sets the output voltage ramp time, while EN can be driven by another regulator's PWRGD signal to coordinate startup order. This capability is explicitly used in multi-rail FPGA power trees documented in TI's application notes for the TPS54318RTER, ensuring safe core-to-I/O voltage sequencing.

How does the TPS54318RTER handle startup into a prebiased output?

The TPS54318RTER implements safe start-up into a prebiased output by disabling the low-side MOSFET until the feedback voltage (VSENSE) rises above the internal 0.8 V reference. This prevents reverse current flow from the output capacitor into the converter, protecting both the TPS54318RTER and downstream circuitry - a documented feature critical for hot-swap and modular power system designs using the TPS54318RTER.

What thermal derating guidance applies to the TPS54318RTER in a 2-layer PCB?

On a standard 2-layer PCB without thermal vias, the TPS54318RTER's junction temperature rise exceeds limits above ~1.8 A continuous load due to higher RθJA (~65°C/W vs. 37°C/W on JEDEC 4-layer board). TI's datasheet recommends ≥4 thermal vias under the PowerPad and connection to an internal ground plane - without these, full 3 A output requires forced air or significant copper area, a constraint directly tied to the TPS54318RTER's thermal design requirements.

Can the TPS54318RTER synchronize to an external clock, and what are the timing requirements?

Yes, the TPS54318RTER synchronizes to an external clock via its RT/CLK pin with a PLL lock-in time of 14 μs. The clock must be 300–2000 kHz, have minimum pulse width ≥75 ns, and meet VIH ≥1.6 V / VIL ≤0.6 V thresholds. This synchronization eliminates beat frequencies in multi-converter systems - a verified capability used in TI reference designs featuring the TPS54318RTER alongside other SWIFT™ regulators.