Texas Instruments TPS54611PWPG4

Overview

TPS54611PWPG4 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 0.9-V output voltage (±2% over temperature/load), internal compensation, and PowerPAD™ HTSSOP-28 package for high-density point-of-load regulation in FPGAs and microprocessors.

For engineers reviewing the TPS54611PWPG4 datasheet, TPS54611PWPG4 pinout, TPS54611PWPG4 application, or TPS54611PWPG4 equivalent, key selection factors include its 350/550 kHz fixed-frequency operation, 3.3-ms internal slow-start time, powergood (PWRGD) open-drain output, thermal shutdown at 150°C, and compatibility with 4.7–10 µH inductors and ceramic output capacitors.

Technical Context

The TPS54611PWPG4 implements a voltage-mode synchronous buck topology with an internally compensated error amplifier (26 dB gain, 3–5 MHz unity-gain bandwidth), adaptive dead-time control to prevent shoot-through, and cycle-by-cycle current limiting triggered within 200 ns of exceeding 7.2–10 A peak current. Its UVLO circuit enforces 2.95-V startup and 2.8-V shutdown with 0.16-V hysteresis.

Switching frequency is selected via FSEL pin (350 kHz at ≤0.8 V, 550 kHz at ≥2.5 V) or externally set from 280–700 kHz using RT-to-AGND resistor; BOOT capacitor (0.022–0.1 µF) supplies the high-side gate driver, while VBIAS provides a regulated 2.8-V internal bias rail with 100 µA sourcing capability.

Key Specifications

Pinout & Package

TPS54611PWPG4 is housed in a thermally enhanced 28-pin HTSSOP (PWP) PowerPAD™ package with exposed thermal pad soldered to AGND plane for optimal junction-to-board heat transfer (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 TPS54611PWPG4, TPS54620RGYT supports wider input range but sacrifices thermal performance and pin compatibility, while MP2315GJ-Z reduces cost at the expense of integrated features and reliability-critical functions like powergood and thermal hysteresis.

Availability

TPS54611PWPG4 is available at Aetrix Electronics and suitable for FPGA core supplies, ASIC point-of-load regulation, and DSP processor rails requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for industrial and telecom infrastructure.

Supply support for TPS54611PWPG4 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 TPS5461x family was designed specifically for low-input-voltage, high-current point-of-load applications in FPGAs, ASICs, and microprocessors-emphasizing integration, thermal performance, and ease of use in space-constrained systems.

FAQ

What is the maximum continuous output current of the TPS54611PWPG4?

The TPS54611PWPG4 delivers 6 A continuously under recommended operating conditions (TJ ≤125°C, VIN = 3–6 V). Its integrated 30-mΩ MOSFETs and PowerPAD™ HTSSOP-28 package enable this rating without external heatsinks. Peak current capability reaches 12 A, supporting transient load demands typical in FPGA and DSP applications. Derating applies above 85°C ambient per the dissipation ratings table in the datasheet.

Does the TPS54611PWPG4 require external compensation components?

No, the TPS54611PWPG4 features internal compensation optimized for standard 4.7–10 µH inductors and ceramic output capacitors. This eliminates the need for external Type-II or Type-III compensation networks, simplifying design and reducing BOM count. The error amplifier's 26-dB gain and 3–5 MHz unity-gain bandwidth ensure stability across the full load and temperature range without user adjustment.

How does the powergood (PWRGD) function work on the TPS54611PWPG4?

The PWRGD pin on the TPS54611PWPG4 is an open-drain output that goes high-impedance when VSENSE ≥90% of the internal 0.891-V reference (i.e., ≥0.802 V for 0.9-V output), indicating valid regulation. It pulls low during UVLO, SS/ENA disable, thermal shutdown, or VSENSE undervoltage. A 35-µs falling-edge deglitch prevents noise-induced false trips, making it suitable for processor reset and supply sequencing in mission-critical systems.

Can the switching frequency of the TPS54611PWPG4 be adjusted, and how?

Yes, the TPS54611PWPG4 supports 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 (e.g., 180 kΩ → 280 kHz, 68 kΩ → 700 kHz). The FSEL pin must be floated or tied appropriately; RT is unused in fixed-frequency modes. This flexibility allows EMI optimization and inductor size trade-offs without changing the IC.

What thermal management features does the TPS54611PWPG4 include?

The TPS54611PWPG4 integrates thermal shutdown at 150°C with 10°C hysteresis, preventing damage during sustained overload. Its PowerPAD™ HTSSOP-28 package features an exposed thermal pad soldered to AGND, achieving 18.2°C/W junction-to-ambient thermal resistance with proper PCB layout (4-layer board, 12 thermal vias). The device also includes UVLO and current limiting to reduce thermal stress during startup and fault conditions.