Texas Instruments TPS51275RUKT

Overview

TPS51275RUKT from Texas Instruments is a dual synchronous step-down controller for notebook and tablet system-power rails. The device controls external MOSFET power stages to generate 5V and 3.3V outputs while also integrating 100mA 5V and 3.3V LDO regulators for bias and standby supply support.

As part of the TPS51275 product family, TPS51275RUKT combines D-CAP adaptive on-time control, 5V to 24V input operation, 300kHz and 355kHz frequency settings, separate switcher enables, power-good indication, output discharge, and protection against overvoltage, undervoltage, overcurrent, UVLO, and overtemperature faults. For engineers reviewing the TPS51275RUKT datasheet, TPS51275RUKT pinout, TPS51275RUKT application, or TPS51275RUKT equivalent, this device is widely used in notebook computers, tablet computers, embedded computing boards, 5V and 3.3V system rails, industrial PCs, and compact motherboard power architectures.

Technical Context

In computing platforms, TPS51275RUKT operates as a controller for two synchronous buck rails rather than as a fully integrated converter. External MOSFETs allow the designer to scale current, thermal behavior, and layout around the 5V and 3.3V power requirements of the system.

The controller accepts a 5V to 24V input and supports 5V and 3.3V outputs adjustable by approximately +/-10%. Built-in 100mA LDOs provide local 5V and 3.3V bias supplies, while the 260kHz VCLK output can drive an external charge pump for load-switch gate-drive support.

TPS51275RUKT is commonly used when D-CAP fast transient response, power-good reporting, dedicated overcurrent setting pins, 0.8ms soft-start, and compact 20-pin 3mm x 3mm QFN integration are required for notebook system-power sequencing.

Key Specifications

Pinout & Package

The TPS51275RUKT pinout includes supply input, controller bias/LDO pins, high-side and low-side gate-drive pins, switch-node pins, current-sense pins, feedback pins, enable inputs, power-good output, VCLK, and ground connections.

For PCB design, the external MOSFET gate-drive loops and current-sense traces should be short, while feedback and compensation nodes should be routed away from switch nodes and high-current copper.

Key Features

• Dual synchronous buck controller targets notebook 5V and 3.3V rails.
• External MOSFET architecture supports scalable rail current.
• Integrated 100mA LDOs reduce bias-regulator count.
• D-CAP control supports fast load transient response.
• Power-good and separate enables support sequencing.
• Protection functions improve system-power robustness.

Applications

Equivalent & Alternatives

When evaluating a TPS51275RUKT equivalent, engineers should compare 5V/3.3V rail support, external MOSFET drive, LDO current, light-load mode, package, protection behavior, and operating-temperature range.

Compared with TPS51275CRUKT, TPS51275RUKT should be selected when its light-load mode and temperature grade match the platform requirement. TPS51275RUKT vs TPS51225RUKT selection depends on exact notebook rail architecture, LDO needs, power-good behavior, protection functions, and PCB compatibility.

Quality

TPS51275RUKT should be sourced as original Texas Instruments components through traceable supply channels. Quality checks may include QFN package inspection, top-mark validation, solderability testing, and 5V/3.3V rail controller verification.

Production validation should include gate-drive waveforms, current-sense behavior, power-good timing, soft-start, overcurrent response, thermal behavior, and transient load response.

Availability

TPS51275RUKT available at Aetrix Electronics and is suitable for notebook, tablet, embedded computing, and motherboard power systems requiring 5V and 3.3V dual-rail controller supply support.

Supply support may include volume procurement planning, scheduled delivery arrangements, traceable sourcing management, and long-term supply support for OEM, industrial electronics, automotive electronics, and embedded product programs. Sample and NPI supply support, as well as urgent in-stock supply support, can also be arranged for prototype builds, pilot runs, and time-critical production needs.

For production builds, confirming suffix, package, light-load mode, temperature grade, external MOSFET design, lifecycle status, and sourcing continuity helps reduce procurement risk.

Manufacturer

Texas Instruments is a global semiconductor manufacturer specializing in analog ICs, embedded processors, power-management devices, interface products, sensing solutions, and industrial semiconductor technologies.

The TPS51275 product family is a Texas Instruments dual synchronous step-down controller series for notebook 5V and 3.3V system rails, integrating bias LDOs and D-CAP control in a compact QFN package.

FAQ

What is TPS51275RUKT used for?

TPS51275RUKT is used for notebook computers, tablet computers, embedded computing boards, industrial PCs, and motherboard 5V and 3.3V power rails.

Where can I find the TPS51275RUKT datasheet download?

The TPS51275RUKT datasheet is available from Texas Instruments and includes electrical ratings, D-CAP operation, pin functions, package data, and application circuits.

What should be considered in TPS51275RUKT pinout design?

Designers should keep MOSFET gate-drive loops compact, route feedback away from switch nodes, and use careful current-sense routing.

Does TPS51275RUKT include LDO regulators?

Yes. It includes built-in 100mA 5V and 3.3V LDO regulators.

What are common TPS51275RUKT equivalent solutions?

Common candidates include TPS51275CRUKT and TPS51225RUKT depending on light-load behavior, rail requirements, protection needs, and package compatibility.