Texas Instruments TPS54615PWPR

Overview

TPS54615PWPR 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 (PWRGD) monitoring - deployed in FPGA core voltage regulation and point-of-load DC/DC conversion.

For engineers reviewing the TPS54615PWPR datasheet, TPS54615PWPR pinout, TPS54615PWPR application, or TPS54615PWPR equivalent, key selection criteria include its 2.5-V ±3% output accuracy over −40°C to 125°C, thermal shutdown at 150°C, 3.3-V VBIAS regulator, and HTSSOP-28 PowerPAD™ package with exposed thermal pad for high-power-density PCB layouts.

Technical Context

The TPS54615PWPR 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 responds within 85 ns (10-mV overdrive), and cycle-by-cycle current limiting triggers within 200 ns after exceeding the 10-A peak limit.

Startup is managed via dual-function SS/ENA pin: enables operation above 1.2 V threshold and provides 4.7-ms internal slow-start time for 2.5-V output; external capacitor extends ramp duration. The device operates exclusively in continuous conduction mode (CCM) at fixed or resistor-programmed frequency, with UVLO activation at 2.95 V and 0.16-V hysteresis.

Key Specifications

Pinout & Package

TPS54615PWPR is housed in a 28-pin HTSSOP (PWP) package with exposed thermal PowerPAD™ on the underside, requiring solder connection to AGND plane for optimal thermal performance (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 TPS54615PWPR, TPS54620RGYT extends input voltage range and improves MOSFET R_DS(on), while MP2315GJ-Z sacrifices PWRGD and internal compensation for lower unit cost - making TPS54615PWPR optimal for 3–6-V, sequenced FPGA/ASIC supplies requiring minimal external components.

Availability

TPS54615PWPR is available at Aetrix Electronics and suitable for FPGA core supplies, ASIC point-of-load regulation, and networking line card power systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS54615PWPR 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 power conversion ICs.

The TPS5461x family was designed specifically for low-voltage, high-current point-of-load applications in FPGA, ASIC, and DSP systems - emphasizing integration, thermal performance, and ease of use in space-constrained designs.

FAQ

What is the maximum continuous output current of the TPS54615PWPR?

The TPS54615PWPR delivers up to 6 A of continuous output current at 2.5 V when properly thermally managed using the HTSSOP-28 PowerPAD™ package with soldered thermal pad. Derating applies above 70°C ambient; full 6-A operation is guaranteed from −40°C to 85°C junction temperature per datasheet specifications.

Does the TPS54615PWPR require external compensation components?

No, the TPS54615PWPR features an internally compensated control loop optimized for standard 4.7–10-µH inductors and common ceramic or polymer output capacitors. This eliminates external compensation networks, simplifying design and reducing bill-of-materials count compared to non-compensated controllers.

How does the powergood (PWRGD) function work on the TPS54615PWPR?

The TPS54615PWPR's open-drain PWRGD pin asserts high when VSENSE ≥ 90% of the internal 0.891-V reference (i.e., ≥2.228 V for 2.5-V output), and remains low during UVLO, SS/ENA disable, or thermal shutdown. A 35-µs falling-edge deglitch ensures noise immunity in electrically noisy environments.

Can the switching frequency of the TPS54615PWPR be adjusted, and how?

Yes - the TPS54615PWPR supports both fixed (350 kHz or 550 kHz selected via FSEL pin) and adjustable (280–700 kHz) frequencies. To adjust, float FSEL and connect a resistor from RT (Pin 28) to AGND; 180-kΩ yields ~280 kHz, 100-kΩ ~500 kHz, and 68-kΩ ~700 kHz per the datasheet equation.

What thermal considerations apply to the TPS54615PWPR in high-power applications?

The TPS54615PWPR requires soldering the exposed PowerPAD™ to a dedicated AGND copper plane for effective heat dissipation. With proper PCB layout (4-layer board, 12 thermal vias), its junction-to-ambient thermal resistance is 18.2°C/W. At 6-A load and 5-V input, power dissipation reaches ~1.5 W - necessitating thermal design verification per Section 10.3 of the datasheet.