Texas Instruments TPS53647RTAT

Overview

TPS53647RTAT from Texas Instruments is a 4-phase, D-CAP+™ step-down buck controller with integrated PMBus™ interface and non-volatile memory (NVM), designed for high-current ASIC and CPU point-of-load power delivery. It supports 0.5 V to 2.5 V output voltage (5-mV steps), 300 kHz–1 MHz switching frequency, dynamic phase shedding, and accurate voltage positioning in a 6 mm × 6 mm QFN-40 package.

For engineers reviewing the TPS53647RTAT datasheet, TPS53647RTAT pinout, TPS53647RTAT application, or TPS53647RTAT equivalent, this page delivers verified technical context, validated pin functions, confirmed PMBus telemetry capabilities (voltage/current/power/temperature), and real-world selection guidance for server, telecom, and smart power system designs.

Technical Context

The TPS53647RTAT implements TI's D-CAP+™ control architecture with programmable overshoot reduction (OSR) and undershoot reduction (USR), enabling fast transient response and minimal output capacitance. Its 4-phase interleaved operation uses AutoBalance™ phase balancing and supports driverless high-frequency switching when paired with compatible NexFET™ power stages like CSD95372BQ5MC.

Configuration is supported via resistor pinstrap or PMBus commands stored in on-chip NVM, including BOOT voltage (8-bit), OCP level (16-level), slew rate (8 settings), and load-line parameters. The device reports faults-including output overvoltage, overcurrent, and thermal events-via dedicated open-drain pins (VR_FAULT, VR_HOT) and PMBus alerts.

Key Specifications

Pinout & Package

TPS53647RTAT is housed in a thermally enhanced 40-pin QFN (RTA) package with an exposed thermal pad connected to GND. Pin functions are validated per TI SLUSC39B Rev B datasheet, including dual-purpose pins for PMBus communication, current sensing, and configuration via resistor dividers.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar multi-phase buck controller applications.

Compared with TPS53647RTAT, TPS53679RTAT extends phase count and current handling for higher-power ASICs, while MP2964GQKT-Z trades configurability and telemetry for integration and cost-making TPS53647RTAT optimal for balanced performance, intelligence, and scalability in enterprise-class power systems.

Availability

TPS53647RTAT is available at Aetrix Electronics and suitable for server power, telecom infrastructure, and smart power system designs requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS53647RTAT 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 TPS53647RTAT belongs to TI's Fusion Digital Power™ controller family, engineered specifically for intelligent, high-current point-of-load applications in datacenter, networking, and AI hardware where precision, telemetry, and thermal resilience are critical.

FAQ

What is the maximum output current supported by the TPS53647RTAT?

The TPS53647RTAT itself is a controller-not a power stage-so its current capability depends on the selected external power stage. When paired with TI's CSD95372BQ5MC NexFET™ power stage, the TPS53647RTAT enables up to 200 A total output current across four phases. Each phase supports up to 72 A peak current, as defined by the OCL-R pin configuration and internal current-sense gain (1.0 V/V). The controller's IMAX setting (via F-IMAX pin) scales dynamically from 18 A to 122 A per phase based on resistor selection.

Does the TPS53647RTAT support VR12.5 and VR12.0 standards?

Yes, the TPS53647RTAT natively supports both VR12.5 and VR12.0 standards. Its SLEW-MODE pin configures DAC mode (bit 7), and VID step size is 5 mV for VR12.0 and 10 mV for VR12.5-matching Intel's specifications. The device implements closed-loop VSP tolerance within ±0.6% for VR12.0 and ±1.0% for VR12.5 across –40°C to 125°C, and supports SVID handshake via PMBus for full VR compliance in server platforms.

How is the TPS53647RTAT configured-through pins or software?

The TPS53647RTAT supports dual-mode configuration: resistor pinstrapping (for factory-set defaults) and PMBus commands (for runtime or field updates). Key parameters-including BOOT voltage, OCP threshold, switching frequency, slew rate, OSR/USR levels, and load-line coefficients-are stored in on-chip non-volatile memory (NVM). TI's Fusion Digital Power Designer GUI provides full graphical configuration, validation, and telemetry logging for the TPS53647RTAT during development and deployment.

Can the TPS53647RTAT operate with only one or two phases active?

Yes, the TPS53647RTAT supports 1-, 2-, 3-, or 4-phase operation dynamically. Phase count is selected at startup via pinstrap (SKIP-NVM pin) or programmed via PMBus command MFR_SPECIFIC_01[1:0]. Dynamic phase shedding is enabled by default and activates automatically when load current falls below the programmable IMAX threshold, improving light-load efficiency without compromising transient response.

What thermal performance can be expected from the TPS53647RTAT in a typical 4-layer PCB layout?

In a standard 4-layer PCB with 2 oz copper, 6 thermal vias under the exposed pad, and 1 in² copper pour, the TPS53647RTAT achieves a junction-to-board thermal resistance (RθJB) of 6.9°C/W and junction-to-ambient (RθJA) of 30.6°C/W. At 12 V input and 1.0 V/100 A output, typical power dissipation is ~3.2 W, resulting in <100°C junction rise above ambient-well within the –40°C to 125°C operating range. Layout guidelines emphasize low-inductance GND connections and proper decoupling at VIN, V5, and V3R3.