Texas Instruments TPS54KB20RZRR

Overview

TPS54KB20RZRR from Texas Instruments is a 4V–16V input, 25A synchronous buck converter with D-CAP4 control, differential remote sense, and ±0.5% reference accuracy over –40°C to +125°C. It integrates 5.8mΩ/2.3mΩ MOSFETs in a 3.00mm × 3.50mm WQFN-HR package and delivers up to 25A continuous output current for high-density server point-of-load regulation.

For engineers reviewing the TPS54KB20RZRR datasheet, TPS54KB20RZRR pinout, TPS54KB20RZRR application, or TPS54KB20RZRR equivalent, key selection considerations include its programmable 800/1100/1400kHz switching frequency, valley overcurrent protection with RILIM-based current limit setting, latch-off fault response, and compatibility with all-ceramic output capacitors without external compensation.

Technical Context

The TPS54KB20RZRR implements adaptive on-time D-CAP4 control, eliminating need for external loop compensation while enabling ultra-fast load-step response across 0.9V–5.5V output range. Its architecture supports both FCCM and selectable Eco-mode (skip-mode) operation via MSEL resistor programming.

Differential remote sensing (GOSNS/VOSNS±) ensures precise load regulation under high-current PCB trace IR drop. The device uses internal 3V LDO for VCC bias but also accepts 3.1V–5.3V external VCC to reduce power loss - critical for efficiency optimization at light loads and high VIN conditions.

Key Specifications

Pinout & Package

The TPS54KB20RZRR is housed in a 16-pin WQFN-HR (RZR) package with 0.4mm pitch, featuring three PGND pins (pins 4, 8, 16) for low-impedance power return and thermal dissipation. The exposed thermal pad is electrically connected to PGND.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54KB20RZRR, TPS54KB22RZRR offers identical form-factor and regulation accuracy but recovers after faults instead of latching off, while TPS54KC23RZRR provides 20% higher current rating with lower RDS(on) - both require revalidation of current-limiting and thermal management.

Availability

TPS54KB20RZRR is available at Aetrix Electronics and suitable for rack server VR12 core supplies, data center switch ASIC rails, and hardware accelerator card power delivery requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TPS54KB20RZRR 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 over 90 years of innovation in high-reliability power conversion solutions.

The TPS54KB2x product line was designed specifically for space-constrained, high-current point-of-load applications in data center computing - emphasizing thermal efficiency, fast transient response, and minimal external component count.

FAQ

What is the reference voltage (VREF) of the TPS54KB20RZRR?

The TPS54KB20RZRR has a fixed 0.9V feedback reference voltage (VFB_REG = 895.5–904.5mV) with ±0.5% accuracy over –40°C to +125°C junction temperature. This value is confirmed in the Electrical Characteristics table (Section 5.5) and applies specifically to the TPS54KB20 variant - distinct from the 0.5V reference used in TPS54KB21/KB23.

Does the TPS54KB20RZRR support remote sensing, and how is it implemented?

Yes, the TPS54KB20RZRR supports differential remote sensing via dedicated GOSNS and VOSNS± pins. GOSNS connects to the load-side ground reference point, while VOSNS+ connects to the load-side output voltage node - enabling rejection of PCB trace IR drop and maintaining ±0.5% regulation accuracy at the load, not just at the IC output.

What fault protection features does the TPS54KB20RZRR include?

The TPS54KB20RZRR includes valley overcurrent limit protection (programmable via RILIM), overvoltage protection (OVP at 115–121% of VREF), undervoltage protection (UVP at 77–83% of VREF), thermal shutdown (150–170°C), and UVLO on both VIN and VCC inputs. All faults trigger a latch-off response, requiring EN cycle to recover.

Can the TPS54KB20RZRR operate with an external VCC bias, and what are the benefits?

Yes, the TPS54KB20RZRR accepts 3.1V–5.3V external bias on the VCC pin to power internal circuitry and gate drivers, bypassing the internal 3V LDO. This reduces power loss - especially beneficial at high input voltages or light loads - and improves overall efficiency by up to 2–3% depending on operating conditions.

Is the TPS54KB20RZRR pin-compatible with other devices in the TPS54KB2x family?

Yes, the TPS54KB20RZRR shares identical pinout and package (16-pin WQFN-HR) with TPS54KB21RZRR, TPS54KB22RZRR, and TPS54KB23RZRR. It is also pin-compatible with the higher-current TPS54KC23RZRR, enabling drop-in replacement where 30A capability or hiccup-mode fault response is acceptable.