Texas Instruments TPS54620RGYR

Overview

TPS54620 from Texas Instruments is a 4.5-V to 17-V input, 6-A synchronous step-down DC/DC converter with integrated 26 mΩ high-side and 19 mΩ low-side MOSFETs, operating at 200 kHz–1.6 MHz switching frequency, featuring 0.8 V ±1% reference voltage and monotonic start-up into prebiased outputs - used in high-density point-of-load regulation for telecom and networking infrastructure.

For engineers reviewing the TPS54620 datasheet, TPS54620 pinout, TPS54620 application, or TPS54620 equivalent, key selection considerations include its split-rail PVIN/VIN architecture (1.6 V–17 V / 4.5 V–17 V), adjustable input UVLO via EN pin, power-good monitoring with ±3% hysteresis, and thermal shutdown at 160°C–175°C.

Technical Context

The TPS54620 implements constant-frequency peak current-mode control with internal slope compensation to prevent subharmonic oscillation across 0–100% duty cycle. Its transconductance error amplifier (1300 μA/V) drives COMP to regulate VSENSE against either the internal 0.8 V reference or SS/TR voltage, enabling tracking and sequencing.

It supports dual power rails: PVIN supplies the power stage (1.6 V–17 V), while VIN powers control circuitry (4.5 V–17 V); BOOT-PH UVLO (2.1 V typical) enables 100% duty-cycle operation when boot capacitor voltage remains above threshold, and bidirectional low-side current limiting (7–10 A sourcing, 2.3 A sinking) prevents reverse-current runaway.

Key Specifications

Pinout & Package

The TPS54620 is housed in a thermally enhanced 3.50 mm × 3.50 mm VQFN-14 package with exposed thermal pad (Pin 15), requiring soldered thermal connection for rated 6-A operation and thermal performance (R_θJB = 11.4°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54620, the TPS54622RGYR offers higher reference accuracy and tighter enable threshold for precision sequencing, while the MP2451DT-LF-Z provides wider input range in a smaller package but lacks critical features like power good, split rail, and 6-A capability - making it unsuitable as a drop-in alternative.

Availability

TPS54620 is available at Aetrix Electronics and suitable for high-density distributed power systems, telecom point-of-load regulation, and industrial embedded control applications requiring stable component supply and long-term manufacturability.

Supply support for TPS54620 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 company headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management ICs with broad industrial, automotive, and communications market reach.

The TPS54620 belongs to TI's SWIFT™ synchronous buck converter product line, designed specifically for high-efficiency, high-current point-of-load regulation in space-constrained infrastructure equipment where thermal performance and reliability are critical.

FAQ

What is the minimum input voltage required for TPS54620 to operate?

The TPS54620 requires VIN ≥ 4.5 V for control circuitry operation, while PVIN can operate as low as 1.6 V when used independently. If VIN and PVIN are tied together, the minimum valid input is 4.5 V. Below this, the internal UVLO disables switching; the TPS54620 enters shutdown with only 2 µA quiescent current.

Can TPS54620 be used in 100% duty-cycle applications?

Yes - the TPS54620 supports 100% duty cycle as long as the BOOT-PH voltage remains above 2.1 V (typical BOOT-PH UVLO threshold). This is achieved by proper boot capacitor sizing and layout; the device monitors BOOT-PH continuously and disables the high-side FET if the threshold is violated, preventing shoot-through or gate-drive failure.

How does the TPS54620 handle prebiased output conditions during startup?

The TPS54620 prevents low-side FET conduction until the SS/TR pin voltage exceeds 1.4 V, ensuring monotonic rise of the output voltage even when the output is precharged. This avoids reverse current flow and potential damage to downstream circuitry - a verified behavior confirmed in the datasheet's "Safe Start-Up into Prebiased Outputs" section.

What is the purpose of the separate PVIN and VIN pins on the TPS54620?

The PVIN pin supplies the power stage (high/low-side MOSFETs), supporting down to 1.6 V, while VIN powers the control circuitry (4.5–17 V). This split-rail architecture allows independent biasing - for example, using a 3.3 V intermediate rail on PVIN while powering control logic from a 12 V main rail on VIN - improving efficiency and flexibility in multi-rail systems.

Does the TPS54620 require an external compensation network?

Yes - the COMP pin connects to an external Type II or Type III compensation network (typically R-C-R-C or R-C) between COMP and GND. The transconductance error amplifier (1300 μA/V) and current-mode architecture demand careful loop compensation to ensure stability across line, load, and temperature; TI provides design calculators and WEBENCH® integration for TPS54620-specific tuning.