Texas Instruments TPS54314PWPRG4

Overview

TPS54314PWPRG4 from Texas Instruments is a synchronous buck PWM DC-DC converter with integrated 60-mΩ high- and low-side MOSFETs, delivering up to 3 A continuous output current at a fixed 1.8 V output voltage with ±2.5% regulation over temperature and load. It operates from a 3-V to 6-V input, features internal compensation, and supports adjustable switching frequency (280–700 kHz) via external RT resistor or fixed 350/550 kHz selection via FSEL pin. It is used in point-of-load regulation for FPGAs and microprocessors.

For engineers reviewing the TPS54314PWPRG4 datasheet, TPS54314PWPRG4 pinout, TPS54314PWPRG4 application, or TPS54314PWPRG4 equivalent, key selection considerations include its 1.8-V fixed output, HTSSOP-20 PowerPAD™ package thermal performance, integrated current limiting and thermal shutdown, and compatibility with standard 4.7–10 µH inductors and ceramic output capacitors.

Technical Context

The TPS54314PWPRG4 implements a voltage-mode synchronous buck topology with an internally compensated error amplifier (26 dB open-loop gain, 3–5 MHz unity-gain bandwidth), adaptive dead-time control to prevent shoot-through, and cycle-by-cycle peak current limiting triggered within 200 ns. Its UVLO circuit enforces 2.95-V startup and 2.8-V shutdown with 0.16-V hysteresis and 2.5-µs deglitching.

It integrates a 2.8-V bias regulator (VBIAS) supplying internal circuitry, a precision 0.891-V reference trimmed during manufacturing, and a powergood (PWRGD) open-drain output asserting low when VSENSE falls below 90% of Vref - with 3% hysteresis and 35-µs falling-edge deglitching - enabling reliable processor reset and supply sequencing.

Key Specifications

Pinout & Package

TPS54314PWPRG4 is housed in a thermally enhanced 20-pin HTSSOP (PWP) package with exposed PowerPAD™ for improved heat dissipation. The package requires soldering the PowerPAD™ to AGND for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54314PWPRG4, TPS54314PWPR offers identical performance in all electrical and thermal parameters, while MP2314DJ-LF-Z trades frequency flexibility and power-good signaling for lower BOM count - making the TI device preferable for designs requiring robust sequencing, thermal margin, and design reuse across multiple output voltages in the TPS5431x family.

Availability

TPS54314PWPRG4 is available at Aetrix Electronics and suitable for point-of-load FPGA core supplies, microprocessor I/O rail regulation, optical transceiver bias supplies, and notebook PC memory interface rails requiring stable component supply and long-term industrial availability.

Supply support for TPS54314PWPRG4 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-efficiency DC-DC conversion.

The TPS5431x family was designed specifically for low-voltage, high-current point-of-load applications in DSPs, FPGAs, ASICs, and microprocessors - emphasizing integration, thermal performance, and ease of use in dense PCB layouts.

FAQ

What is the fixed output voltage of the TPS54314PWPRG4?

The TPS54314PWPRG4 delivers a factory-trimmed fixed output voltage of 1.8 V with ±2.5% initial accuracy across –40°C to 125°C junction temperature and 0–3 A load. This is achieved using an internal 0.891-V reference and precision resistor divider, eliminating the need for external feedback components.

Does the TPS54314PWPRG4 require external compensation components?

No, the TPS54314PWPRG4 features an internally compensated voltage-mode control loop optimized for standard 4.7–10 µH inductors and ceramic output capacitors. External compensation is neither required nor supported - simplifying design and reducing BOM count.

How does the powergood (PWRGD) function work on the TPS54314PWPRG4?

The TPS54314PWPRG4's PWRGD pin is an open-drain output that goes high-impedance when VSENSE ≥ 90% of the 0.891-V reference (≈0.802 V), and pulls low otherwise. It also asserts low during UVLO, SS/ENA disable, or thermal shutdown - enabling reliable system reset and supply sequencing.

Can the switching frequency of the TPS54314PWPRG4 be adjusted, and how?

Yes. The TPS54314PWPRG4 supports three frequency modes: 350 kHz (FSEL ≤0.8 V), 550 kHz (FSEL ≥2.5 V), or 280–700 kHz (FSEL floating + RT resistor to AGND). For example, a 100-kΩ resistor on RT yields ~500 kHz, verified in datasheet Figure 4.

What thermal performance can be expected from the TPS54314PWPRG4 in its HTSSOP package?

With the PowerPAD™ thermally soldered to AGND, the TPS54314PWPRG4 achieves a junction-to-ambient thermal resistance (θ_JA) of 26.0 °C/W. At 25°C ambient, this allows up to 3.85 W of power dissipation - sufficient for 3-A operation at typical 5-V input/1.8-V output conditions.