Texas Instruments TPS54418RTET

Overview

TPS54418RTET 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 soft-start control, power-good monitoring, and cycle-by-cycle current limiting.

For engineers reviewing the TPS54418RTET datasheet, TPS54418RTET pinout, TPS54418RTET application, or TPS54418RTET equivalent, key selection considerations include its 4-A continuous output current, 350-μA quiescent current in active operation, 2-μA shutdown current, adjustable UVLO via EN pin, and compatibility with external clock synchronization at 300–2000 kHz.

Technical Context

The TPS54418RTET implements constant-frequency peak-current-mode control with internal slope compensation to prevent subharmonic oscillation across duty cycles up to 100%. Its transconductance error amplifier (225 μS normal / 70 μS soft-start mode) compares VSENSE against either the 0.8-V reference or SS voltage, enabling precise regulation and controlled startup.

It features a PLL-based RT/CLK interface supporting both resistor-programmed timing (200–2000 kHz) and external clock synchronization (300–2000 kHz), plus BOOT-PH UVLO protection that sustains high-side conduction until BOOT voltage drops below 2.5 V-enabling near-100% duty cycle operation during dropout conditions.

Key Specifications

Pinout & Package

TPS54418RTET uses a thermally enhanced 3 mm × 3 mm, 16-pin WQFN package with exposed PowerPad (GND-connected) for optimal thermal performance. The package is RoHS-compliant and moisture-sensitive level 2a per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54418RTET, TPS54318RTET offers pin-compatible down-rating for cost-sensitive 3-A applications, while MP2315DJ-LF-Z trades synchronization, PWRGD, and thermal robustness for minimal footprint-making each viable only within their validated operational boundaries.

Availability

TPS54418RTET is available at Aetrix Electronics and suitable for FPGA power delivery, industrial PLCs, optical transceiver biasing, and automotive ADAS camera systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS54418RTET 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 and embedded processing technologies, with decades of expertise in power management IC design and manufacturing.

The TPS54418RTET belongs to TI's SWIFT™ synchronous buck converter family, engineered for high-density, high-efficiency point-of-load regulation in FPGA, ASIC, and microprocessor applications demanding precision, reliability, and thermal resilience.

FAQ

What is the maximum continuous output current of the TPS54418RTET?

The TPS54418RTET delivers 4 A continuous output current under recommended operating conditions (T_J ≤ 125°C, proper PCB thermal design). This rating assumes use of the 3 mm × 3 mm WQFN package with adequate copper area and thermal vias under the PowerPad. Derating applies above 125°C junction temperature per the thermal characteristics table in the datasheet.

Does the TPS54418RTET support external clock synchronization?

Yes, the TPS54418RTET supports external clock synchronization via the RT/CLK pin. When driven with a clean CMOS clock signal between 300 kHz and 2 MHz, the internal PLL locks to the falling edge of the input clock, enabling deterministic switching alignment for EMI reduction. The pin also accepts a timing resistor for free-running operation from 200 kHz to 2 MHz.

How is the output voltage set on the TPS54418RTET?

The output voltage of the TPS54418RTET is set using a resistor divider from VOUT to the VSENSE pin, referenced to an internal 0.8-V ±1% bandgap. For example, a 100-kΩ top resistor (R1) and 100-kΩ bottom resistor (R2) yields 1.6 V output. TI recommends 1% tolerance or better resistors and cautions against excessively large values (>1 MΩ) due to VSENSE input current errors.

What protection features does the TPS54418RTET include?

The TPS54418RTET integrates cycle-by-cycle current limiting, thermal shutdown at 175°C with 15°C hysteresis, BOOT-PH UVLO, undervoltage lockout on VIN (2.6 V default), overvoltage protection via PWRGD comparator activation, and frequency foldback during overload. These features collectively prevent damage during startup, short-circuit, or thermal overload events without requiring external components.

Can the TPS54418RTET start up into a pre-biased output?

Yes, the TPS54418RTET supports safe start-up into a pre-biased output. Its control architecture prevents reverse current flow through the low-side MOSFET during initial soft-start, eliminating output voltage undershoot or latch-up. This behavior is confirmed in the datasheet's "Safe Start-Up into Prebiased Output" section and verified across –40°C to 125°C operating range.