Texas Instruments TPS54561DPRT

Overview

TPS54561DPRT from Texas Instruments is a 60-V input, 5-A synchronous step-down DC-DC converter with integrated 87-mΩ high-side MOSFET, Eco-mode™ for light-load efficiency, adjustable 100-kHz–2.5-MHz switching frequency, and 0.8-V ±1% internal reference-designed for industrial power rails in 12-V/24-V/48-V systems.

For engineers reviewing the TPS54561DPRT datasheet, TPS54561DPRT pinout, TPS54561DPRT application, or TPS54561DPRT equivalent, key selection criteria include input voltage range (4.5–60 V), load dump survival (65 V per ISO 7637), thermal pad WSON-10 package, soft-start/sequencing capability, and PWRGD open-drain power-good monitoring.

Technical Context

The TPS54561DPRT implements constant-frequency current-mode control with internal slope compensation to stabilize operation at duty cycles >50%. Its phase-locked loop (PLL) enables synchronization to external clock signals via the RT/CLK pin, while cycle-by-cycle current limiting and frequency foldback protect during overloads.

It integrates BOOT recharge FET and UVLO monitoring on BOOT–SW to sustain high-duty-cycle operation near VIN–VOUT dropout; EN pin supports adjustable undervoltage lockout with hysteresis, and SS/TR enables precise soft-start ramping or supply tracking for multi-rail sequencing.

Key Specifications

Pinout & Package

TPS54561DPRT uses a thermally enhanced 10-pin WSON package (4.0 mm × 4.0 mm) with exposed thermal pad tied to GND for PCB-level heat dissipation. The package complies with JEDEC MO-229 standard and requires solder paste stencil design for thermal pad reflow.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar step-down converter applications.

Compared with LM5164QPWPRQ1 and MP2451DT-LF-Z, the TPS54561DPRT uniquely delivers 5-A output within a 60-V input range, Eco-mode efficiency at light loads, and full-feature power-good signaling-making it irreplaceable in high-current industrial buck applications requiring robust transient immunity and thermal resilience.

Availability

TPS54561DPRT is available at Aetrix Electronics and suitable for industrial motor control, automotive vehicle accessories, and 48-V communications systems requiring stable component supply across extended temperature and voltage ranges.

Supply support for TPS54561DPRT 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-reliability power conversion solutions.

The TPS54561DPRT belongs to TI's SWIFT™ family of high-voltage buck regulators, engineered specifically for rugged industrial and automotive power systems demanding wide VIN, high current, and transient robustness.

FAQ

What is the maximum input voltage the TPS54561DPRT can withstand during transients?

The TPS54561DPRT supports 65-V absolute maximum input voltage per ISO 7637 load dump specification. This rating applies to VIN–SW and SW–GND transients with 5-ns and 10-ns durations, ensuring survivability in automotive and industrial environments with severe voltage spikes. The device remains functional and undamaged within these limits, as verified in TI's SLVSBO1G datasheet Section 6.1.

Does the TPS54561DPRT require an external bootstrap diode?

No, the TPS54561DPRT does not require an external bootstrap diode. It integrates a dedicated BOOT recharge FET that automatically refreshes the BOOT–SW capacitor during each switching cycle. This feature enables high-duty-cycle operation (e.g., 12 V → 10 V) without external components and eliminates associated losses and board space-confirmed in Section 7.3.1 and Pin Function Table 5-1 of the TPS54561DPRT datasheet.

How is soft-start configured on the TPS54561DPRT?

Soft-start on the TPS54561DPRT is configured using an external capacitor connected to the SS/TR pin. A typical 10-nF capacitor yields ~10-ms ramp time; larger values increase rise time linearly. The SS/TR pin voltage overrides the internal 0.8-V reference, enabling tracking of another supply or precise sequencing. Discharge occurs automatically during fault conditions to ensure repeatable restart-detailed in Sections 5 and 7.3.8 of the TPS54561DPRT datasheet.

Can the TPS54561DPRT synchronize to an external clock signal?

Yes, the TPS54561DPRT synchronizes to an external clock via the RT/CLK pin. When pulled above 1.55 V, the internal amplifier disables and the pin becomes a high-impedance clock input to the PLL. It accepts clock frequencies from 160 kHz to 2.3 MHz and locks within 78 μs. Synchronization eliminates beat frequencies in multi-converter systems-specified in Section 6.7 and Feature Description 7.3.1 of the TPS54561DPRT datasheet.

What thermal management is required for the TPS54561DPRT at 5-A continuous load?

The TPS54561DPRT requires its exposed thermal pad to be soldered to a PCB GND plane with ≥4 thermal vias (0.3-mm diameter, filled or capped) for effective heat transfer. At 5-A continuous load with 12-V input and 5-V output, junction temperature rise is ~45°C above ambient with standard 2-layer board; R_θJB = 12.3°C/W enables convection cooling in most industrial enclosures-per Thermal Information Table 6.4 and Layout Guidelines Section 10.1 of the TPS54561DPRT datasheet.