Texas Instruments 905-5462001

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 (CCM), supports monotonic start-up into prebiased outputs, and delivers high-density power regulation for point-of-load applications.

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), 2-µA shutdown quiescent current, and open-drain PWRGD fault monitoring with ±3% output voltage window.

Technical Context

The TPS54620 implements constant-frequency peak current-mode control with internal slope compensation to prevent subharmonic oscillation across full duty cycle range. Its transconductance error amplifier (1300 µA/V) drives COMP for external Type II/III compensation, while the RT/CLK pin enables either resistor-set oscillator (200–1600 kHz) or synchronization to external clock via PLL.

Protection architecture includes cycle-by-cycle high-side current limiting (8–11 A), bidirectional low-side current limiting (sourcing: 7–10 A; sinking: 2.3 A), thermal shutdown at 160–175°C with 10°C hysteresis, and BOOT-PH UVLO that enables 100% duty cycle operation when boot capacitor voltage exceeds 2.1 V.

Key Specifications

Pinout & Package

The TPS54620 is housed in a thermally enhanced 3.50 mm × 3.50 mm VQFN package with 14 signal pins and an exposed thermal pad (Pin 15) requiring solder connection for proper thermal performance and electrical grounding.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54620, TPS54560 offers wider input range but sacrifices prebias safety and low-voltage flexibility, while LM5164 trades integration for high-voltage capability-neither matches the TPS54620's combination of 6-A current, split-rail inputs, and robust sequencing features in a 3.5×3.5 mm QFN.

Availability

TPS54620 is available at Aetrix Electronics and suitable for high-density distributed power systems, point-of-load regulation, and broadband infrastructure applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.

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 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 high-current, space-constrained point-of-load applications demanding integrated power stages, precision regulation, and robust protection.

FAQ

What is the minimum input voltage required for TPS54620 to operate with full 6-A output capability?

The TPS54620 maintains full 6-A output current capability down to 4.5 V on the VIN pin and 1.6 V on the PVIN pin. However, full-rated output requires sufficient headroom for the selected output voltage and duty cycle; for example, achieving 3.3 V at 6 A requires ≥4.5 V on VIN and ≥3.3 V on PVIN to ensure stable regulation and thermal margin per the datasheet's recommended operating conditions.

Can TPS54620 safely start up into a precharged output voltage?

Yes, the TPS54620 supports monotonic start-up into prebiased outputs. Its internal logic disables low-side MOSFET sinking until the SS/TR pin voltage exceeds 1.4 V, preventing reverse current flow and uncontrolled discharge of the precharged rail. This behavior is confirmed in Section 7.3.6 of the SLVS949F datasheet and validated in TI's application note SNVA234.

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

The PVIN pin supplies power to the high-side and low-side MOSFETs, while the VIN pin powers only the internal control circuitry. This split-rail architecture allows PVIN to operate as low as 1.6 V (e.g., for intermediate bus conversion), while VIN remains at 4.5–17 V to ensure stable bias for the error amplifier and logic-enabling higher efficiency in low-input-voltage power stages without compromising control integrity.

How does the BOOT-PH UVLO function affect TPS54620 operation?

The BOOT-PH UVLO monitors the voltage across the bootstrap capacitor (between BOOT and PH pins) and forces the high-side MOSFET off if it drops below 2.1 V. This prevents insufficient gate drive and enables reliable 100% duty cycle operation when the boot capacitor is adequately recharged-critical for low-dropout applications where VOUT approaches VIN. The feature is detailed in Section 7.1 and Figure 16 of the datasheet.

What external components are mandatory for basic TPS54620 operation?

Mandatory external components for basic TPS54620 operation include: input capacitor (Cin) on VIN/PVIN, output capacitor (Co), power inductor (Lo), bootstrap capacitor (Cboot) between BOOT and PH, feedback resistors (R1/R2) for VSENSE, and an SS/TR capacitor for slow-start. The exposed thermal pad must also be soldered to a PCB thermal plane per layout guidelines in Section 10.