Texas Instruments TPS54620RGYT

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, 0.8 V ±1% reference, and adjustable 200 kHz–1.6 MHz switching frequency. It operates in continuous conduction mode, supports monotonic start-up into prebiased outputs, and delivers regulated 3.3 V at up to 6 A for point-of-load power in 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), BOOT-PH UVLO threshold (2.1 V), PWRGD fault monitoring (±6% VREF window), and thermal shutdown at 160°C–175°C with 10°C hysteresis.

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) compares VSENSE against the lower of SS/TR voltage or 0.8 V reference, driving COMP to regulate output via PH node switching.

It features dual overload protection: high-side current limit (8–11 A), low-side sourcing limit (7–10 A), and low-side sinking limit (2.3 A), plus BOOT-PH UVLO enabling 100% duty-cycle operation when boot capacitor voltage exceeds 2.1 V. Thermal shutdown disables switching above 160°C and auto-restarts after junction temperature drops 10°C below trip point.

Key Specifications

Pinout & Package

The TPS54620 is housed in a thermally enhanced 3.50 mm × 3.50 mm VQFN-14 package with an exposed thermal pad (Pin 15) that must be soldered to PCB ground for proper thermal performance and electrical stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54620RGYT, TPS54520RGYT offers identical interface and layout compatibility at lower current rating, while LMZ36002RKGT trades design flexibility for faster time-to-market via fully integrated magnetics and shielding - both require revalidation of thermal and transient performance in the target application.

Availability

TPS54620RGYT is available at Aetrix Electronics and suitable for high-density distributed power systems, high-performance point-of-load regulation, and broadband communications infrastructure requiring stable component supply and long-term industrial lifecycle support.

Supply support for TPS54620RGYT 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 TPS54620 belongs to TI's SWIFT™ synchronous buck converter family, designed specifically for space-constrained, high-current point-of-load applications demanding high efficiency, robust protection, and flexible power sequencing.

FAQ

What is the minimum input voltage required for TPS54620RGYT to operate with PVIN and VIN separated?

The TPS54620RGYT supports split-rail operation where PVIN can be as low as 1.6 V while VIN must remain within 4.5 V–17 V. This allows the power stage to function from a low intermediate bus (e.g., 1.8 V or 2.5 V) while control circuitry receives stable bias from a higher auxiliary rail. The device maintains regulation and protection features across this full range, provided EN is asserted and thermal limits are observed.

How does the TPS54620RGYT achieve monotonic start-up into a prebiased output?

The TPS54620RGYT prevents low-side MOSFET conduction until the SS/TR pin voltage exceeds 1.4 V, ensuring the output capacitor is not discharged during startup. This behavior is enforced by internal logic that gates the low-side driver, allowing only high-side switching once the soft-start ramp reaches the threshold. As a result, the output voltage rises monotonically even when initially charged to 3.3 V or higher.

Can TPS54620RGYT operate at 100% duty cycle, and what conditions must be met?

Yes, the TPS54620RGYT supports 100% duty cycle operation as long as the BOOT-PH voltage remains above 2.1 V, the BOOT-PH UVLO threshold. This requires proper sizing and placement of the BOOT capacitor (typically 0.1 µF X7R ceramic) between BOOT and PH pins, with minimal trace inductance. At light loads and low input voltages, the internal boot recharge circuit maintains sufficient gate drive for continuous high-side conduction.

What is the purpose of the dual GND pins (Pins 2 and 3) and dual PH pins (Pins 11 and 12) on the TPS54620RGYT?

The dual GND pins reduce impedance in the control ground return path and improve noise immunity for the error amplifier and PWM comparator. Dual PH pins lower switch-node loop inductance by distributing high di/dt current across two parallel paths, minimizing voltage spikes and EMI generation. Both features contribute directly to stable regulation and improved transient response in high-frequency, high-current designs.

How is the output voltage accuracy maintained over temperature for TPS54620RGYT?

The TPS54620RGYT uses a precision bandgap-derived voltage reference trimmed to 0.8 V ±1% over –40°C to 150°C junction temperature. This tolerance is guaranteed by production testing and reflects total error including initial offset, thermal drift, and load regulation effects. When paired with 1% resistor dividers, the overall output voltage accuracy remains within ±1.5% across the full operating range.