Texas Instruments TPS54317RHFT

Overview

TPS54317RHFT from Texas Instruments is a 3-A synchronous step-down DC/DC converter with adjustable output voltage down to 0.9 V, 60-mΩ integrated high-side MOSFET, and externally adjustable switching frequency from 280 kHz to 1.6 MHz. It operates from 3-V to 6-V input and delivers stable 1.8-V output at 3 A for FPGA core supplies in telecom infrastructure.

For engineers reviewing the TPS54317RHFT datasheet, TPS54317RHFT pinout, TPS54317RHFT application, or TPS54317RHFT equivalent, key selection criteria include its thermally enhanced 24-pin QFN (RHF) PowerPAD™ package, internal slow-start (3.35 ms), ±1% reference accuracy (0.891 V), and dual-function SYNC/RT pins enabling precise frequency control and external synchronization.

Technical Context

The TPS54317RHFT integrates a high-performance voltage error amplifier (90–110 dB open-loop gain, 3–5 MHz unity-gain bandwidth), adaptive dead-time control, and peak-current-mode PWM regulation. Its dual ground architecture separates AGND (for compensation, bias, and feedback) from PGND (high-current power return) to minimize noise coupling.

It features an internally trimmed 0.891-V reference with ±1% accuracy over temperature, undervoltage lockout (2.95 V start, 2.8 V stop), and thermal shutdown at 135–165°C with 10°C hysteresis. The BOOT-to-PH bootstrap circuit enables high-side FET drive, while PWRGD provides open-drain power-good signaling at 90% Vref.

Key Specifications

Pinout & Package

TPS54317RHFT uses a thermally enhanced 24-pin QFN (RHF) package with exposed PowerPAD™ for low junction-to-board thermal impedance (1.7°C/W). The package measures 4 mm × 5 mm and requires soldering the thermal pad to AGND for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54317RHFT, TPS54318RHLR sacrifices adjustability for simplicity in fixed-rail systems, while MP2332HGTL-Z trades feature depth (PWRGD, SYNC, compensation flexibility) for footprint reduction - making TPS54317RHFT optimal for high-reliability, multi-rail telecom and industrial applications.

Availability

TPS54317RHFT is available at Aetrix Electronics and suitable for telecom infrastructure, FPGA power delivery, and industrial embedded systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS54317RHFT 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.

The TPS54317RHFT belongs to TI's SWIFT™ family of synchronous buck converters, designed specifically for high-density, low-voltage point-of-load applications in networking, computing, and communications equipment.

FAQ

What is the maximum supported switching frequency for TPS54317RHFT?

The TPS54317RHFT supports an externally adjustable switching frequency up to 1.6 MHz via the RT pin. When synchronized externally, it accepts input frequencies from 330 kHz to 1600 kHz. This upper limit enables compact magnetics and improved transient response in space-constrained designs, while remaining within the device's validated operating range per SLVS619B.

Does TPS54317RHFT require external compensation components?

Yes, the TPS54317RHFT is externally compensated via the COMP and VSENSE pins. It does not include internal compensation, allowing designers to tailor loop stability and transient response using a Type II or Type III network. This flexibility is essential for optimizing performance across varied output capacitor ESR values and load conditions - a confirmed requirement stated in the "Externally Compensated for Design Flexibility" feature list.

What thermal management is required for full 3-A operation of TPS54317RHFT?

For continuous 3-A operation, the TPS54317RHFT requires soldering its exposed PowerPAD™ to a dedicated AGND copper area with ≥6 thermal vias (0.013″ diameter) connecting to internal ground planes. TI's recommended test board uses a 3″×3″, 4-layer PCB with 2 oz. copper; derating is needed on smaller or 2-layer boards. Junction temperature must remain ≤125°C under worst-case ambient and airflow conditions.

Can TPS54317RHFT operate with a 3.3-V input and 1.8-V output at 3 A?

Yes, the TPS54317RHFT is explicitly characterized for this condition: Figure 10 in SLVS619B shows a typical application delivering 3 A at 1.8 V with 3.3-V input, and efficiency graphs (Figure 13) confirm >92% efficiency at that point. Input voltage range (3–6 V), output adjustability (down to 0.9 V), and 3-A rating are all validated for this configuration under TJ = 25°C and fs = 1.1 MHz.

How does the PWRGD pin function on TPS54317RHFT?

The PWRGD pin on TPS54317RHFT is an open-drain output that goes high only when VSENSE ≥90% of the 0.891-V reference (i.e., ≥0.802 V) and SS/ENA is active. It remains low during startup, under-voltage, or shutdown. Its 0.18–0.3-V saturation voltage at 2.5-mA sink enables direct interfacing with 1.8-V or 3.3-V logic for reset sequencing - a function verified in the Electrical Characteristics table and Functional Block Diagram.