Texas Instruments TPS54615PWPRG4

Overview

TPS54615PWPRG4 from Texas Instruments is a 3-V to 6-V input, 6-A synchronous buck PWM converter with integrated 30-mΩ high- and low-side MOSFETs, fixed 2.5-V output voltage (±3% over temperature/load), internal compensation, and powergood signaling. It delivers high efficiency in point-of-load regulation for FPGAs and microprocessors.

For engineers reviewing the TPS54615PWPRG4 datasheet, TPS54615PWPRG4 pinout, TPS54615PWPRG4 application, or TPS54615PWPRG4 equivalent, key selection criteria include its 28-pin HTSSOP PowerPAD™ package, adjustable switching frequency (280–700 kHz), thermal shutdown at 150°C, 3.3-V VBIAS supply, and 4.7-ms typical internal slow-start time.

Technical Context

The TPS54615PWPRG4 implements a voltage-mode synchronous buck topology with an internally compensated error amplifier (26 dB 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 100 ns leading-edge blanking for robust current-limit response.

It integrates a 2.8-V UVLO with 0.16-V hysteresis, a 0.9-V reference scaled to 2.5-V output, and a dual-function SS/ENA pin supporting both enable logic and external capacitor-based soft-start. The VBIAS regulator supplies internal circuitry at 2.7–2.9 V and supports limited external loading.

Key Specifications

Pinout & Package

TPS54615PWPRG4 is housed in a thermally enhanced 28-pin HTSSOP (PWP) package with exposed PowerPAD™ thermal pad, requiring soldered connection to AGND for optimal thermal performance (RθJA = 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 TPS54615PWPRG4, TPS54620RGYT offers better thermal performance in smaller QFN packaging but removes powergood signaling, while MP2315DJ-LF-Z reduces BOM count and cost at the expense of frequency adjustability and sequencing capability.

Availability

TPS54615PWPRG4 is available at Aetrix Electronics and suitable for FPGA power delivery, industrial DSP systems, and optical line card biasing requiring stable component supply and long-term production continuity.

Supply support for TPS54615PWPRG4 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 TPS5461x family was designed specifically for high-density, low-voltage point-of-load applications in computing, networking, and industrial systems-emphasizing integration, thermal robustness, and ease of use.

FAQ

What is the output voltage tolerance of the TPS54615PWPRG4 over temperature and load?

The TPS54615PWPRG4 provides a fixed 2.5-V output with ±3.0% regulation tolerance across the full operating range: 3 V ≤ VIN ≤ 6 V, 0 A ≤ IL ≤ 6 A, and −40°C ≤ TJ ≤ 125°C. At 25°C with 5-V input, initial accuracy is ±1.0%, and line/load regulation contribute ≤0.088%/V and ≤0.0917%/A respectively.

Does the TPS54615PWPRG4 require external compensation components?

No, the TPS54615PWPRG4 features internal compensation optimized for standard output filter inductors (4.7 µH to 10 µH) and capacitors. This eliminates external compensation networks while maintaining stability and fast transient response-reducing design complexity and BOM count.

How does the TPS54615PWPRG4 handle overcurrent conditions?

The TPS54615PWPRG4 employs cycle-by-cycle peak current limiting with 100 ns leading-edge blanking to prevent false triggering. When current exceeds 7.2–12 A (depending on VIN), the high-side MOSFET turns off within 200 ns. Thermal shutdown activates at 135–165°C if overload persists.

Can the switching frequency of the TPS54615PWPRG4 be adjusted, and how?

Yes, the TPS54615PWPRG4 supports both fixed and adjustable frequencies. Set FSEL ≤0.8 V for 350 kHz or ≥2.5 V for 550 kHz. For 280–700 kHz, float FSEL and connect an RT resistor (68 kΩ to 180 kΩ) from RT to AGND-the frequency approximates 100 kΩ/R (kHz).

What is the purpose of the PowerPAD™ thermal pad on the TPS54615PWPRG4 package?

The exposed PowerPAD™ on the bottom of the TPS54615PWPRG4's HTSSOP package must be soldered to a large AGND copper pour to achieve RθJA = 18.2°C/W. Without soldering, thermal resistance rises to 40.5°C/W-risking thermal shutdown at >3 A load. It serves as primary thermal path and electrical AGND connection.