Texas Instruments TPS62873Z4WRXSR

Overview

TPS62873Z4WRXSR from Texas Instruments is a 15A synchronous step-down DC/DC converter with I²C interface, differential remote sensing, and stackable architecture for high-current FPGA/ASIC core supplies. It operates from 2.7V–6V input, delivers 0.4V–3.35V output with ±1% accuracy, and features 7mΩ/4.5mΩ internal MOSFETs in a 2.55mm × 3.55mm VQFN package.

For engineers reviewing the TPS62873Z4WRXSR datasheet, TPS62873Z4WRXSR pinout, TPS62873Z4WRXSR application, or TPS62873Z4WRXSR equivalent, this page provides verified specifications, validated pin functions, confirmed remote-sense implementation, and real-world use cases for DDR memory and digital core power delivery under fast transient loads.

Technical Context

The TPS62873Z4WRXSR implements fixed-frequency DCS-Control topology with inner emulated current loop, middle direct feedback loop, and outer voltage-regulating loop-enabling sub-10µs transient response. Its 2.25MHz default switching frequency (resistor-selectable to 1.5/2.5/3.0MHz) supports compact 110–330nH inductors and low-ESR ceramic output capacitors.

Differential remote sensing (VOSNS/GOSNS) maintains ±1% DC output accuracy at point-of-load across load, line, and temperature variations. I²C interface (up to 1MHz) enables dynamic voltage scaling, thermal warning monitoring, and synchronized startup sequencing in stacked configurations.

Key Specifications

Pinout & Package

TPS62873Z4WRXSR uses a 16-pin RXS VQFN package (2.55mm × 3.55mm × 1mm) with wettable flanks and exposed thermal pad soldered to GND for optimal thermal performance (R_θJA = 43.2°C/W, R_θJB = 7.7°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS62873Z0WRXSR and TPS62873Z2WRXSR, the TPS62873Z4WRXSR offers a factory-configured 0.850V startup voltage and I²C address 0x40-making it optimal for systems requiring precise initialization voltage alignment without external resistor changes or firmware updates.

Availability

TPS62873Z4WRXSR is available at Aetrix Electronics and suitable for FPGA core supplies, DDR memory power delivery, and optical network ASIC applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS62873Z4WRXSR 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 TPS6287x product line was designed specifically for high-current, fast-transient digital core power in FPGAs, ASICs, and memory subsystems-emphasizing remote sensing accuracy, stackability, and I²C configurability for modern compute platforms.

FAQ

What is the default startup output voltage of the TPS62873Z4WRXSR?

The TPS62873Z4WRXSR has a factory-configured default startup output voltage of 0.850V, set by the internal VSEL resistor network (6.2kΩ to GND). This value is fixed for this variant and cannot be altered without external hardware modification. The TPS62873Z4WRXSR also uses I²C address 0x40 at power-on, which is linked to this voltage setting per TI's device options table.

Does the TPS62873Z4WRXSR support stacking with other TPS6287x devices?

Yes, the TPS62873Z4WRXSR supports stacking with identical-current-rated TPS6287x devices (e.g., other TPS62873 variants) to increase total output current. Stacking requires interconnecting COMP, EN, PG, and SYNC_OUT pins per TI's layout guidelines. The TPS62873Z4WRXSR must be used only with other 15A devices to prevent premature current limiting; mixing with 12A or 9A units is not supported.

What is the maximum supported I²C clock frequency for the TPS62873Z4WRXSR?

The TPS62873Z4WRXSR supports I²C Fast Mode Plus operation up to 1MHz, as specified in Section 6.6 of its datasheet. This allows rapid voltage updates (e.g., DVFS steps in <50µs) and real-time telemetry reads. The SDA pin supports 3mA sink current, ensuring robust communication even on electrically noisy boards with longer traces or multiple slaves.

How does the differential remote sensing work on the TPS62873Z4WRXSR?

The TPS62873Z4WRXSR uses dedicated VOSNS and GOSNS pins to measure output voltage and return-path voltage differentially at the load. This cancels PCB trace resistance effects, enabling ±1% regulation accuracy at the point-of-load across all conditions. The inputs accept ±100mV common-mode range and feature low bias currents (<6µA), minimizing error from routing parasitics.

What thermal protection features are implemented in the TPS62873Z4WRXSR?

The TPS62873Z4WRXSR includes two thermal protections: a 150°C thermal warning threshold that asserts an interrupt via I²C status register, and a 170°C thermal shutdown that disables switching until junction temperature falls by 20°C hysteresis. Both thresholds are monitored continuously and are independent of load current, ensuring reliable operation under sustained high-power conditions.