Texas Instruments TPS54615PWPG4

Overview

TPS54615PWPG4 from Texas Instruments is a 3-V to 6-V input, 2.5-V fixed-output synchronous buck PWM converter with integrated 30-mΩ high- and low-side MOSFETs, delivering up to 6-A continuous output current. It features internal compensation, 350/550-kHz fixed or 280–700-kHz adjustable switching frequency, and powergood monitoring - designed for point-of-load regulation in FPGAs and microprocessors.

For engineers reviewing the TPS54615PWPG4 datasheet, TPS54615PWPG4 pinout, TPS54615PWPG4 application, or TPS54615PWPG4 equivalent, key selection criteria include its 2.5-V ±3% output accuracy over temperature and load, thermal shutdown at 150°C, and compatibility with external slow-start capacitor timing for controlled ramp-up in multi-rail systems.

Technical Context

The TPS54615PWPG4 implements a voltage-mode synchronous buck architecture with an internally compensated error amplifier (3–5 MHz unity-gain bandwidth) and adaptive dead-time control to prevent shoot-through. Its PWM comparator uses a 1-V peak-to-peak ramp with 70–85 ns propagation delay, enabling fast transient response (10–20 µs recovery).

It integrates dual 30-mΩ MOSFETs rated for 12-A peak current, supports both fixed-frequency operation (via FSEL pin logic levels) and externally resistor-programmed frequency (RT-to-AGND), and includes cycle-by-cycle current limiting with 100 ns leading-edge blanking and 200 ns total response time.

Key Specifications

Pinout & Package

TPS54615PWPG4 is housed in a thermally enhanced 28-pin HTSSOP (PWP) PowerPAD™ package with exposed thermal pad soldered to PCB ground plane for optimal heat dissipation (R_θJA = 18.2°C/W with solder).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54615PWPG4, TPS54615PWPR offers identical performance in reel format for volume manufacturing, while TPS54620RGYT trades internal compensation and thermal performance for smaller footprint and higher frequency - making it less suitable for thermally demanding industrial applications.

Availability

TPS54615PWPG4 is available at Aetrix Electronics and suitable for FPGA power delivery, microprocessor core supplies, and industrial PLC I/O modules requiring stable component supply and long-term lifecycle support.

Supply support for TPS54615PWPG4 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 ICs.

The TPS5461x family was designed specifically for high-current, low-voltage point-of-load applications in computing, communications, and industrial systems - emphasizing integration, thermal robustness, and ease of implementation.

FAQ

What is the output voltage tolerance of the TPS54615PWPG4 over temperature and load?

The TPS54615PWPG4 delivers 2.5 V with ±3.0% initial accuracy over full operating conditions (−40°C to 125°C junction temperature, 0–6 A load, 3–6 V input). This specification is verified across process, voltage, and temperature corners and includes line and load regulation contributions totaling ≤0.0917%/A and ≤0.088%/V respectively.

Does the TPS54615PWPG4 require external compensation components?

No, the TPS54615PWPG4 features an internally compensated voltage-mode control loop optimized for standard 4.7–10 µH inductors and typical output capacitors. External compensation is neither required nor supported - the device achieves stable operation with minimal external components beyond input/output capacitors, BOOT capacitor, and optional RT resistor.

How does the powergood (PWRGD) function behave during startup and fault conditions?

The PWRGD pin on the TPS54615PWPG4 remains low until VSENSE reaches ≥90% of the internal 0.891-V reference, and stays high only when VIN > UVLO threshold (2.95 V), SS/ENA > 1.2 V, and thermal shutdown is inactive. It includes 35-µs falling-edge deglitching and 3% hysteresis to reject noise, ensuring clean reset signaling for processors and FPGAs.

Can the switching frequency of the TPS54615PWPG4 be adjusted, and how?

Yes - the TPS54615PWPG4 supports three frequency modes: 350 kHz (FSEL ≤0.8 V), 550 kHz (FSEL ≥2.5 V), or 280–700 kHz via RT resistor (180 kΩ to 68 kΩ to AGND). The RT method overrides FSEL; floating FSEL enables RT programming. Frequency accuracy is ±10% over temperature and voltage.

What thermal performance can be expected from the TPS54615PWPG4 in a standard 4-layer PCB?

In a standard 3″×3″, 4-layer PCB with 1.5 oz copper on top/bottom layers and 12 thermal vias to the PowerPAD™, the TPS54615PWPG4 achieves R_θJA = 18.2°C/W. At 6-A load and 5-V input, typical power dissipation is ~1.2 W, resulting in ~22°C junction-to-ambient rise - well within the 125°C max operating temperature limit.