Texas Instruments TPS54418RTER

Overview

TPS54418RTER from Texas Instruments is a 2.95-V to 6-V input, 4-A synchronous step-down DC/DC converter with integrated 30-mΩ high- and low-side 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 with power-good monitoring and adjustable soft-start.

For engineers reviewing the TPS54418RTER datasheet, TPS54418RTER pinout, TPS54418RTER application, or TPS54418RTER equivalent, key selection criteria include its 4-A continuous output current, 350-μA quiescent supply current, RT/CLK synchronization support, PWRGD open-drain output with 93%–107% window, and safe startup into prebiased outputs.

Technical Context

The TPS54418RTER implements peak-current-mode control with internal slope compensation to prevent subharmonic oscillation across 0–100% duty cycle. Its error amplifier features dual transconductance (225 μS normal / 70 μS soft-start mode) and compares VSENSE against either the 0.8-V reference or SS pin voltage.

Switching is governed by an internal oscillator or external clock via RT/CLK pin with PLL lock-in time of 14 μs; frequency foldback activates during overcurrent or startup to limit inductor current. BOOT-to-PH UVLO (2.1 V) enables near-100% duty-cycle operation while maintaining gate drive integrity.

Key Specifications

Pinout & Package

TPS54418RTER uses a thermally enhanced 3 mm × 3 mm, 16-pin WQFN package with exposed PowerPad (GND-connected) for optimal heat dissipation. Pin 1 is VIN; pin 16 is GND; PowerPad must be soldered to PCB ground plane using ≥4 thermal vias.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2315GJ-Z and TPS54318RTER, the TPS54418RTER uniquely balances 4-A capability, 2-MHz flexibility, and synchronization in a 3-mm WQFN - making it optimal for high-density, multi-rail systems requiring precise timing coordination and thermal resilience.

Availability

TPS54418RTER is available at Aetrix Electronics and suitable for FPGA power delivery, industrial PLCs, optical transceivers, and automotive ADAS camera modules requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS54418RTER 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 ICs for industrial, automotive, and communications markets.

The TPS54418RTER belongs to TI's SWIFT™ synchronous buck converter family, designed specifically for high-efficiency, high-density point-of-load regulation in FPGA, ASIC, and DSP applications demanding tight voltage accuracy and robust thermal performance.

FAQ

What is the maximum continuous output current of the TPS54418RTER?

The TPS54418RTER delivers 4 A continuous output current under recommended operating conditions (TJ ≤ 125°C on JEDEC 4-layer board). This rating assumes proper thermal design including connection of the PowerPad to a PCB ground plane with ≥4 thermal vias. At higher junction temperatures or with inadequate cooling, current must be derated per the thermal characteristics table in the datasheet.

Does the TPS54418RTER support synchronization to an external clock?

Yes, the TPS54418RTER supports external clock synchronization via the RT/CLK pin. It accepts clock signals from 300 kHz to 2 MHz with a minimum pulse width of 75 ns. An internal PLL achieves lock-in within 14 μs, enabling precise timing alignment across multiple rails to suppress beat frequencies and reduce EMI in dense power systems.

How does the TPS54418RTER handle startup into a precharged output?

TPS54418RTER supports safe startup into prebiased outputs by disabling the high-side MOSFET until the feedback loop takes control. During prebias conditions, the device avoids reverse current flow through the low-side MOSFET, preventing potential damage to downstream loads or instability in cascaded regulators - a critical feature for complex power sequencing in FPGAs and processors.

What is the purpose of the SS pin on the TPS54418RTER?

The SS (soft-start) pin on the TPS54418RTER controls output voltage ramp rate via an external capacitor charged by a 1.8-μA internal current source. It enables programmable startup timing and power supply sequencing. The SS pin also discharges automatically during faults (UVLO, thermal shutdown, EN deassertion), ensuring repeatable restart behavior without manual reset.

Can the TPS54418RTER operate at 100% duty cycle?

Yes, the TPS54418RTER supports near-100% duty cycle operation as long as the BOOT-to-PH voltage remains above 2.1 V. When BOOT-PH drops below this threshold, the high-side MOSFET is disabled and the low-side MOSFET conducts continuously - enabling dropout operation down to VIN ≈ VOUT + 0.3 V, ideal for low-headroom applications like post-regulation of 3.3-V rails.