Texas Instruments TPS543B20RVFT

Overview

TPS543B20RVFT from Texas Instruments is a 25-A, 4-V to 19-V input, synchronous step-down DC/DC converter with adaptive internal compensation, integrated 4.1 mΩ/1.9 mΩ NexFET™ power stage, and pin-strappable 0.6 V–1.1 V reference (±0.5% accuracy). It delivers high-efficiency POL regulation for FPGA core rails and ASIC I/O supplies in enterprise servers and networking infrastructure.

For engineers reviewing the TPS543B20RVFT datasheet, TPS543B20RVFT pinout, TPS543B20RVFT application, or TPS543B20RVFT equivalent, key selection considerations include stackable 2×50-A current sharing, differential remote sensing, hiccup-mode overcurrent protection, and 300 kHz–2 MHz programmable switching frequency with external sync capability.

Technical Context

The TPS543B20RVFT implements emulated peak-current-mode control with an internal ramp generator that tracks duty cycle to provide stable loop response without external compensation across 300 kHz–2 MHz. Its ACM architecture supports low-ESR MLCC output capacitors and delivers fast transient response via Asynchronous Pulse Injection (API) and body braking.

It integrates dual N-channel NexFET™ MOSFETs in a single LQFN-CLIP package, enabling lossless low-side current sensing and safe startup into prebiased outputs. Dual-device stacking provides synchronized clocking, voltage sharing (VSHARE), and current sharing (ISHARE) with <±15% current mismatch at ≥20 A per phase.

Key Specifications

Pinout & Package

TPS543B20RVFT is housed in a 40-pin LQFN-CLIP (RVFT) package measuring 5.0 mm × 7.0 mm with 0.5-mm pitch and a single exposed thermal pad internally connected to PGND. The package supports high-density, thermally robust POL layouts with minimal footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS543B20RVFT, TPS543C20RVFT offers higher single-device current but lacks optimized thermal performance for sustained 25-A operation, while MP8770GQ-Z omits critical features like remote sensing and stacking-making TPS543B20RVFT the preferred choice for high-accuracy, scalable server and networking POL designs.

Availability

TPS543B20RVFT is available at Aetrix Electronics and suitable for enterprise servers, 400G networking switches, and high-end storage controllers requiring stable component supply, long-term lifecycle support, and traceable sourcing for production ramp.

Supply support for TPS543B20RVFT 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 ICs, with decades of expertise in high-performance DC/DC conversion.

The TPS543B20RVFT belongs to TI's SWIFT™ synchronous buck converter family, designed specifically for high-current, low-voltage point-of-load applications in datacenter, telecom, and enterprise infrastructure where efficiency, density, and reliability are critical.

FAQ

What is the maximum output current capability of the TPS543B20RVFT?

The TPS543B20RVFT delivers 25 A continuously in standalone operation. When two TPS543B20RVFT devices are stacked using ISHARE and VSHARE pins, the solution supports up to 50 A with synchronized switching, matched output voltage, and current sharing accuracy of ±15% at ≥20 A per phase. Thermal design must accommodate combined power dissipation in stacked configurations.

Does the TPS543B20RVFT require external compensation components?

No, the TPS543B20RVFT uses internally compensated emulated peak-current-mode (ACM) control with an integrated ramp generator. This eliminates the need for external Type II or Type III compensation networks, simplifying design and improving stability across 300 kHz–2 MHz switching frequencies and varying output capacitor ESR/ESL conditions.

How is the output voltage programmed on the TPS543B20RVFT?

The TPS543B20RVFT output voltage is set via the VSEL pin: a resistor connected from VSEL to AGND selects one of ten discrete internal reference voltages ranging from 0.6 V to 1.1 V with ±0.5% accuracy. For output voltages above 1.1 V, external resistor divider feedback is used, referenced to the internal VREF. The SS pin further configures soft-start time from 0.5 ms to 32 ms.

Can the TPS543B20RVFT operate safely into a prebiased output?

Yes, the TPS543B20RVFT supports safe startup into prebiased outputs. It prevents reverse current by inhibiting SW pulses until the internal soft-start voltage exceeds the sensed output voltage. Then, it gradually increases low-side FET conduction over 128 cycles to ensure monotonic, overshoot-free ramp-up-critical for protecting sensitive FPGA and ASIC loads.

What thermal management features does the TPS543B20RVFT include?

The TPS543B20RVFT integrates thermal shutdown at 155–165 °C with 30 °C hysteresis, and its LQFN-CLIP package features a bottom-exposed thermal pad internally tied to PGND. With R_θJC(bot) = 1.2 °C/W and R_θJB = 4.2 °C/W, effective PCB copper pour and solder coverage enable full 25-A operation at 70 °C ambient. Layout guidelines mandate low-inductance PVIN-to-PGND bypassing and thermal pad grounding.