Texas Instruments TPS54611PWP

Overview

TPS54611PWP from Texas Instruments is a 3-V to 6-V input, 6-A synchronous buck PWM converter with integrated 30-mΩ high-side and low-side MOSFETs, fixed 0.9-V output voltage (±2% over temperature/load), internal compensation, and PowerPAD™ thermally enhanced HTSSOP-28 package. It delivers high efficiency in point-of-load regulation for FPGAs and microprocessors.

For engineers reviewing the TPS54611PWP datasheet, TPS54611PWP pinout, TPS54611PWP application, or TPS54611PWP equivalent, key selection considerations include its 350/550 kHz fixed-frequency operation, 3.3-ms internal slow-start time, powergood (PWRGD) open-drain output, UVLO threshold at 2.95 V, and thermal shutdown at 150°C - all critical for stable low-voltage rail generation in space-constrained systems.

Technical Context

The TPS54611PWP implements a voltage-mode synchronous buck topology with an integrated error amplifier (26 dB gain, 3–5 MHz unity-gain bandwidth), adaptive dead-time control, and cycle-by-cycle peak current limiting (7.2–12 A depending on VIN). Its oscillator supports dual fixed frequencies (350 kHz or 550 kHz) via FSEL pin or externally adjustable 280–700 kHz via RT resistor.

It features a dedicated VBIAS regulator (2.7–2.9 V output, 100 µA load capability), bootstrapped high-side gate drive (0.022–0.1 µF BOOT capacitor), and precision voltage reference (0.891 V nominal, ±0.6% over –40°C to 125°C). The PWRGD output asserts low when VSENSE falls below 90% of Vref, with 3% hysteresis and 35-µs deglitching.

Key Specifications

Pinout & Package

TPS54611PWP is housed in a 28-pin HTSSOP (PWP) package with exposed thermal pad (PowerPAD™) soldered to AGND for enhanced thermal performance. The package measures 9.7 mm × 4.4 mm × 1.2 mm and requires minimum 12 thermal vias under the pad per TI layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54611PWP, TPS54620RGYR offers higher peak current and smaller package but sacrifices PWRGD and frequency adjustability, while MP2315GJ-Z reduces size and IQ but removes critical system-monitoring functions - making TPS54611PWP the optimal choice for FPGA/DSP designs requiring full-feature integration in thermally demanding environments.

Availability

TPS54611PWP is available at Aetrix Electronics and suitable for FPGA core supplies, ASIC I/O rails, DSP processor cores, and low-power microcontroller applications requiring stable component supply across industrial, communications, and embedded computing programs.

Supply support for TPS54611PWP 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 and automotive-grade reliability.

The TPS5461x product line was designed specifically for high-density, low-voltage point-of-load regulation in FPGA, ASIC, and microprocessor systems - emphasizing thermal performance, integration, and ease of use in space- and power-constrained designs.

FAQ

What is the recommended input capacitor configuration for TPS54611PWP?

TI recommends using parallel low-ESR ceramic capacitors totaling 10–20 µF across the VIN pins (20–24), placed as close as possible to the package with direct connections to PGND pins (15–19). A combination of one 10-µF and two 4.7-µF X7R 0805 capacitors is typical. This minimizes input ripple and ensures stable operation during high di/dt load transients. The TPS54611PWP datasheet specifies 1–10 µF per VIN pin, and proper placement is critical to avoid oscillation or premature current-limit triggering.

Does TPS54611PWP support external frequency synchronization?

No, TPS54611PWP does not support external clock synchronization. Its oscillator is either internally fixed at 350 kHz or 550 kHz (selected via FSEL pin) or externally adjustable from 280 kHz to 700 kHz using an RT-to-AGND resistor - but it lacks a SYNC pin for master-slave clock alignment. For synchronized multi-phase or noise-sensitive applications, designers must use frequency dithering or select alternatives like TPS54620, which includes a SYNC input. The TPS54611PWP's architecture prioritizes simplicity and integration over synchronization capability.

How is the powergood (PWRGD) output of TPS54611PWP used in system design?

The PWRGD pin on TPS54611PWP is an open-drain output that pulls low when VSENSE drops below 90% of the internal 0.891-V reference (i.e., ~0.802 V), or when UVLO is active, SS/ENA is low, or thermal shutdown occurs. It requires an external pull-up resistor (typically 10 kΩ to 3.3 V or VCC) and is commonly connected to a processor's RESET_N input or FPGA configuration manager to ensure safe power-on sequencing. Its 3% hysteresis and 35-µs deglitch prevent false resets from noise, making TPS54611PWP suitable for mission-critical digital systems.

Can TPS54611PWP operate with a 3.3-V input to deliver 0.9-V at 6 A?

Yes, TPS54611PWP is fully specified for 3.0–6.0 V input operation and delivers 6 A continuously at 0.9 V with 3.3-V input. At this condition, typical efficiency exceeds 91%, junction temperature remains within limits (≤115°C at 70°C ambient with proper PCB layout), and current limit is 7.2–10 A depending on temperature. The device's low 30-mΩ MOSFETs and optimized gate drive minimize conduction and switching losses - confirmed in Figure 9 (Device Power Losses vs Load Current) of the TPS54611PWP datasheet.

What is the function of the VBIAS pin on TPS54611PWP, and how should it be decoupled?

The VBIAS pin on TPS54611PWP supplies regulated 2.7–2.9 V to internal analog and digital circuitry, including the error amplifier and PWM comparator. It must be bypassed with a high-quality, low-ESR 0.1–1 µF X7R or X5R ceramic capacitor placed directly between VBIAS and AGND (Pin 1), with minimal trace length. TI warns that external loads on VBIAS may degrade regulation if they draw >100 µA or inject switching noise - so it should not be used as a general-purpose LDO unless carefully filtered. This decoupling is mandatory for stable TPS54611PWP operation across temperature and load.