Texas Instruments TPS51623RSMR

Overview

TPS51623RSMR from Texas Instruments is a VR12.1-compliant, driverless, 2-phase step-down controller for VCPU power delivery. It implements D-CAP+™ architecture with overlapping pulse support, delivers 0.25 V to 1.52 V output via 8-bit DAC, operates across 300 kHz–1 MHz switching frequency, supports zero load line applications, and integrates VR_READY, ALERT, and VR_HOT signals for Intel CPU power management.

For engineers reviewing the TPS51623RSMR datasheet, TPS51623RSMR pinout, TPS51623RSMR application, or TPS51623RSMR equivalent, key selection criteria include SVID compliance, phase balancing capability, adjustable voltage positioning, light-load efficiency in CCM/DCM, and thermal performance in the 4 mm × 4 mm VQFN package.

Technical Context

The TPS51623RSMR uses D-CAP+™ control with overlapping pulse support to achieve fast transient response and reduced output capacitance requirements. Its AutoBalance™ phase balancing ensures current sharing between phases without external sensing resistors, while 8-level OSR/USR tuning enables precise dynamic voltage deviation control during load steps.

This controller supports both discrete MOSFETs and DrMOS/power stage implementations, with default boot voltage of 1 V (externally adjustable), PS4-mode quiescent power of 0.25 mW, and full VR12.1 I/O feature set including programmable SVID address (0–7) and voltage slew rate control.

Key Specifications

Pinout & Package

The TPS51623RSMR is housed in a thermally enhanced 32-pin VQFN (RSM) package measuring 4.00 mm × 4.00 mm with 0.4 mm pitch and exposed thermal pad. The package requires soldering of the thermal pad to PCB for mechanical stability and thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar VR12.1 CPU power controller applications.

Compared with TPS51623RSMR, the TPS51622RSMR offers simplified single-phase design at lower cost and current capacity, while the ISL95815IRZ adds VR12.5 support and integrated drivers-making it suitable for next-gen platforms but requiring different layout and thermal management.

Availability

TPS51623RSMR is available at Aetrix Electronics and suitable for desktop CPU power delivery, laptop VCPU regulation, and server VR module designs requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for TPS51623RSMR 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 company specializing in analog and embedded processing technologies, with leadership in power management ICs for computing, industrial, and automotive markets.

The TPS51623RSMR belongs to TI's VR12.x CPU power controller product line, engineered specifically for high-efficiency, high-transient-response voltage regulation in Intel-based platforms requiring strict SVID compliance and zero load line behavior.

FAQ

What is the default boot voltage of the TPS51623RSMR?

The TPS51623RSMR has a default boot voltage of 1 V, which is the initial output voltage before SVID communication establishes the final target. This value can be overridden by an external resistor divider connected to the VREF pin, allowing customization for non-standard CPU voltage requirements or legacy compatibility. The TPS51623RSMR maintains this boot setting until the CPU sends its first VID code via the SVID bus.

Does the TPS51623RSMR support both CCM and DCM operation?

Yes, the TPS51623RSMR supports continuous conduction mode (CCM) and discontinuous conduction mode (DCM) in single-phase operation to optimize light-load efficiency. In 2-phase mode, it defaults to CCM for high-current stability, but automatically transitions individual phases into DCM when load drops below threshold-reducing switching losses without sacrificing transient response. This behavior is inherent to the D-CAP+™ architecture and requires no external configuration for TPS51623RSMR.

What does "driverless configuration" mean for the TPS51623RSMR?

"Driverless configuration" means the TPS51623RSMR generates high-side and low-side gate drive signals directly compatible with DrMOS modules, TI power stages, or discrete FETs without requiring external gate drivers. Its PHASE1 and PHASE2 outputs provide logic-level PWM signals with appropriate dead-time control and slew rate limiting, enabling high-frequency switching up to 1 MHz while minimizing layout complexity and component count for TPS51623RSMR-based designs.

How is voltage positioning implemented in the TPS51623RSMR?

Voltage positioning in the TPS51623RSMR is implemented through adjustable load-line slope control that dynamically lowers output voltage under increasing load-matching Intel VR12.1 specifications. The controller uses sensed current (via RDS(on) or external resistor) and internal DAC calibration to generate a precise offset, ensuring the CPU receives optimal voltage across its entire operating range. This function is fully integrated and requires no external compensation components for TPS51623RSMR.

What thermal considerations apply to the TPS51623RSMR VQFN package?

The TPS51623RSMR uses a 4 mm × 4 mm VQFN package with an exposed thermal pad that must be soldered to a dedicated copper pour on the PCB for effective heat dissipation. TI recommends minimum 77% solder paste coverage on the thermal pad and use of ≥4 thermal vias filled or tented beneath it. Without proper thermal pad connection, junction temperature may exceed 105°C under full load, violating the rated operating range and risking premature failure of the TPS51623RSMR.