Texas Instruments TPS54315PWPRG4

Overview

TPS54315PWPRG4 from Texas Instruments is a 3-A synchronous buck PWM converter with integrated high- and low-side MOSFETs, fixed 2.5-V output voltage, 3–6-V input range, and internal compensation. It delivers regulated power to FPGA core rails, DSP I/O supplies, and ASIC point-of-load applications with 1.0% initial output accuracy and fast transient response.

For engineers reviewing the TPS54315PWPRG4 datasheet, TPS54315PWPRG4 pinout, TPS54315PWPRG4 application, or TPS54315PWPRG4 equivalent, key selection criteria include its HTSSOP-20 PowerPAD™ package thermal performance, adjustable 280–700 kHz switching frequency via RT resistor, integrated VBIAS regulator, powergood (PWRGD) signaling, and cycle-by-cycle overcurrent protection with 100 ns leading-edge blanking.

Technical Context

The TPS54315PWPRG4 implements a voltage-mode synchronous buck topology with an internally compensated error amplifier (26 dB open-loop gain, 3–5 MHz unity-gain bandwidth) and adaptive dead-time control to prevent shoot-through. Its PWM comparator features 70–85 ns propagation delay and supports continuous conduction mode across 0–3 A load range.

It integrates a 2.7–2.9-V VBIAS regulator for internal circuitry, a precision 0.891-V reference trimmed at production, and undervoltage lockout with 2.95-V start/2.80-V stop thresholds and 0.16-V hysteresis. Startup is controlled by the SS/ENA pin, enabling both logic-level enable and external capacitor-programmable slow-start (4.7 ms typical internal time).

Key Specifications

Pinout & Package

TPS54315PWPRG4 is housed in a thermally enhanced 20-pin HTSSOP (PWP) package with exposed PowerPAD™ for low-thermal-resistance PCB mounting. The PowerPAD™ must be soldered to AGND for optimal thermal and electrical performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54315PWPR and TPS54325RVL, the TPS54315PWPRG4 uniquely combines fixed 2.5-V output, 3–6-V input compatibility, integrated PWRGD and VBIAS, and HTSSOP PowerPAD™ thermal performance - making it the most direct fit for space-constrained, thermally demanding 2.5-V point-of-load applications.

Availability

TPS54315PWPRG4 is available at Aetrix Electronics and suitable for FPGA core supplies, DSP I/O rails, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for TPS54315PWPRG4 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 TPS54315PWPRG4 belongs to TI's SWIFT™ family of integrated synchronous buck regulators, designed specifically for high-density, low-voltage point-of-load applications in computing, communications, and industrial systems where board space and thermal performance are critical.

FAQ

What is the recommended input capacitor configuration for TPS54315PWPRG4?

TI specifies parallel 1–10 µF low-ESR ceramic capacitors placed directly at the VIN pins (14–16) and PGND pins (11–13). Use X7R or X5R dielectrics with 0805 or larger case sizes; total effective capacitance should exceed 10 µF with impedance <50 mΩ at 100 kHz. This ensures stable input voltage during high di/dt switching events and minimizes radiated EMI from the input loop. The TPS54315PWPRG4 datasheet Figure 10 shows a validated 3× 4.7-µF layout.

Does TPS54315PWPRG4 support external synchronization to a master clock?

No, the TPS54315PWPRG4 does not include a SYNC pin and cannot be externally synchronized. It supports only three frequency modes: fixed 350 kHz (FSEL ≤0.8 V), fixed 550 kHz (FSEL ≥2.5 V), or adjustable 280–700 kHz via RT-to-AGND resistor. For synchronized operation, consider the pin-compatible TPS5432x series (e.g., TPS54328) which adds a dedicated SYNC input.

How is the powergood (PWRGD) signal asserted on TPS54315PWPRG4?

The PWRGD pin on TPS54315PWPRG4 is an open-drain output that pulls low when any of the following occur: VSENSE falls below 90% of the 0.891-V reference (i.e., <0.802 V), VIN drops below UVLO stop threshold (~2.8 V), SS/ENA is below enable threshold (<0.82 V), or thermal shutdown activates. It goes high-impedance only when all conditions are satisfied - confirming valid 2.5-V output, stable input, enabled state, and safe junction temperature.

Can TPS54315PWPRG4 operate with a 2.8-V input supply?

No. The TPS54315PWPRG4 has an absolute minimum input voltage of 3 V due to its undervoltage lockout (UVLO) circuit, which prevents startup until VIN reaches 2.95 V. Operation below 3 V is not supported - attempting to power it from 2.8 V will result in no output and persistent PWRGD low state. For sub-3-V inputs, consider the TPS6286xx or TPS6290x families.

What is the maximum achievable efficiency of TPS54315PWPRG4 at 2.5 V/3 A output?

Per TI's SLVS416C Figure 9 and efficiency curves, the TPS54315PWPRG4 achieves up to 92% peak efficiency at 5-V input, 2.5-V/2-A output, and 550-kHz switching. At full 3-A load and 5-V input, efficiency drops to ~90.5% due to increased conduction losses. With 3.3-V input, peak efficiency is ~88% at 2-A and ~86.5% at 3-A - values confirmed by measured data in the datasheet's Typical Characteristics section.