Texas Instruments TPS54317RHFTG4

Overview

TPS54317RHFTG4 from Texas Instruments is a 3-A synchronous step-down DC/DC converter with adjustable output voltage down to 0.9 V, 1% reference accuracy, 280–1600 kHz adjustable switching frequency, and integrated 60-mΩ high-side/low-side MOSFETs. It delivers stable 1.8-V power to FPGAs and DSPs in point-of-load applications with fast transient response and thermal shutdown protection.

For engineers reviewing the TPS54317RHFTG4 datasheet, TPS54317RHFTG4 pinout, TPS54317RHFTG4 application, or TPS54317RHFTG4 equivalent, key selection criteria include input voltage range (3–6 V), output current capability (3 A continuous), thermal performance in QFN-24 PowerPAD™, external compensation flexibility, and PWRGD signaling for system sequencing and fault monitoring.

Technical Context

The TPS54317RHFTG4 implements a voltage-mode PWM control architecture with an externally compensated error amplifier (90–110 dB open-loop gain, 3–5 MHz unity-gain bandwidth) and adaptive dead-time logic. Its internal 0.891-V precision reference enables ±1% output regulation over line, load, and temperature.

It integrates dual N-channel MOSFETs (r_DS(on) = 59 mΩ @ 6 V, 85 mΩ @ 3 V), a dedicated VBIAS LDO (2.7–2.9 V output), and independent analog (AGND) and power (PGND) ground paths to isolate noise-sensitive control circuitry from high-current switching nodes.

Key Specifications

Pinout & Package

TPS54317RHFTG4 uses a thermally enhanced 24-pin QFN (RHF) package with exposed PowerPAD™ for efficient heat dissipation. The package measures 4 mm × 5 mm and requires soldering the thermal pad to AGND for optimal thermal performance (θ_JA = 19.7°C/W on standard 4-layer board).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54318RHLR and MP2333HG-LL-Z, the TPS54317RHFTG4 uniquely balances design flexibility (external compensation, adjustable f_sw, dual grounds), precision (1% V_ref, 90% duty cycle), and thermal robustness (PowerPAD™), making it optimal for FPGA/DSP core rails where regulation accuracy and transient response are critical.

Availability

TPS54317RHFTG4 is available at Aetrix Electronics and suitable for FPGA power delivery, DSP point-of-load regulation, and optical line card auxiliary supplies requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS54317RHFTG4 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 technologies, with decades of expertise in high-reliability DC/DC conversion.

The TPS54317RHFTG4 belongs to TI's SWIFT™ family of synchronous buck converters, designed specifically for high-efficiency, high-density point-of-load power in space-constrained digital systems like networking, telecom, and computing infrastructure.

FAQ

What is the recommended input voltage range for the TPS54317RHFTG4?

The TPS54317RHFTG4 operates with a nominal input voltage range of 3 V to 6 V, supporting common intermediate bus voltages such as 3.3 V and 5 V. Operation below 3 V is prohibited by the undervoltage lockout (UVLO) circuit, which disables the device until VIN exceeds 2.95 V. This ensures reliable startup and prevents erratic behavior during brownout conditions.

Does the TPS54317RHFTG4 require external compensation components?

Yes, the TPS54317RHFTG4 is externally compensated - its COMP pin must be connected to VSENSE via a Type III compensation network (typically two resistors and two capacitors). This design allows engineers to tailor loop stability and transient response for specific output capacitor ESR, capacitance, and load characteristics, unlike fixed-compensation alternatives.

How does the PWRGD pin function on the TPS54317RHFTG4?

The PWRGD pin on the TPS54317RHFTG4 is an open-drain output that goes high (pulled up externally) only when the output voltage reaches and maintains ≥90% of the internal 0.891-V reference (i.e., ≥0.802 V). It remains low during startup, fault conditions, or when SS/ENA is inactive - enabling precise power sequencing and processor reset in multi-rail systems.

Can the TPS54317RHFTG4 synchronize to an external clock?

Yes, the TPS54317RHFTG4 supports external synchronization via its SYNC pin, accepting TTL/CMOS-compatible clock signals from 330 kHz to 1600 kHz. When synchronized, the internal oscillator locks to the external frequency, allowing EMI reduction through deterministic switching and avoiding beat frequencies in multi-converter systems.

What thermal considerations apply to the TPS54317RHFTG4's PowerPAD™ package?

The TPS54317RHFTG4's exposed thermal pad (Pin 25) must be soldered to a solid AGND copper plane using ≥6 thermal vias (0.013" diameter) to achieve rated 3-A performance. On a standard 4-layer board, this yields θ_JA = 19.7°C/W; insufficient thermal relief causes junction temperature to exceed 150°C, triggering thermal shutdown and derating output current.