Texas Instruments TPS51225BRUKR

Overview

TPS51225BRUKR from Texas Instruments is a dual synchronous step-down controller designed for notebook and tablet system-power supply rails. The device supports a 5.5 V to 24 V input range, provides 5 V and 3.3 V output regulation, integrates 100 mA 5 V and 3.3 V LDOs, and uses adaptive on-time D-CAP™ control for fast transient response with low external component count.

For engineers reviewing the TPS51225BRUKR datasheet, TPS51225BRUKR pinout, TPS51225BRUKR application, or TPS51225BRUKR equivalent, this B-version controller is most relevant for dual 5 V / 3.3 V notebook power rails requiring Out-of-Audio™ light-load operation, separate EN1 / EN2 switcher control, 260 kHz VCLK charge-pump drive, low-side MOSFET RDS(on) current sensing, and compact 20-pin 3 mm × 3 mm WQFN assembly.

Technical Context

TPS51225BRUKR controls two synchronous buck channels from a 5.5 V to 24 V VIN rail, with CH1 targeted for 5 V output and CH2 targeted for 3.3 V output. Its adaptive on-time D-CAP™ architecture sets typical switching frequencies of 300 kHz for CH1 and 355 kHz for CH2 at 20 V input, while the internal 2.00 V reference supports ±10% adjustable output-voltage setting through external feedback dividers.

The B-version uses Out-of-Audio™ light-load operation, keeping switching behavior away from audible-frequency operation during light-load conditions. Integrated support functions include 100 mA VREG5 and VREG3 LDO outputs, 0.78 ms ramp-up soft-start, open-drain PGOOD, output discharge, cycle-by-cycle overcurrent control through CS1 / CS2, OVP, UVP, UVLO, and 155°C typical overtemperature shutdown.

Key Specifications

Pinout & Package

TPS51225BRUKR is supplied in the 20-pin RUK WQFN package with a 3 mm × 3 mm body, 0.4 mm terminal pitch, 0.8 mm maximum height, and exposed thermal pad. This compact no-lead package helps notebook and tablet power boards place dual buck-control, LDO, charge-pump clock, power-good, and current-limit functions close to the external MOSFETs while using the exposed pad for ground connection, mechanical stability, and heat transfer.

Key Features

• Dual synchronous buck controller for 5 V and 3.3 V notebook system rails.
• 5.5 V to 24 V VIN range for adapter and battery-powered portable platforms.
• Out-of-Audio™ light-load operation in the TPS51225B version.
• Built-in 100 mA 5 V and 3.3 V LDO outputs with VREG3 always-on operation.
• 260 kHz VCLK output for charge-pump drive without reducing main converter efficiency.
• OVP, UVP, OCP, UVLO, OTP, output discharge, soft-start, and open-drain PGOOD support.

Applications

Equivalent & Alternatives

When evaluating TPS51225BRUKR equivalent devices, engineers should compare skip-mode behavior, always-on LDO behavior, package, reel quantity, VREG5 / VREG3 operation, EN1 / EN2 control, output rails, and whether the power design needs Out-of-Audio™ light-load operation.

Compared with TPS51225RUKR, TPS51225BRUKR is optimized for systems that need Out-of-Audio™ light-load operation while keeping the same core 5 V / 3.3 V dual buck controller architecture. TPS51225BRUKR vs TPS51225CRUKR selection depends mainly on OOA versus Auto-skip behavior and whether VREG5 must be always on, while TPS51225BRUKR vs TPS51225BRUKT selection depends on reel quantity and production logistics.

Quality

TPS51225BRUKR should be sourced as original Texas Instruments components through traceable and controlled supply channels. Quality verification procedures may include WQFN package inspection, 1225B top-mark validation, moisture-sensitivity and reel-label confirmation, solderability testing, VREG5 / VREG3 output verification, EN1 / EN2 threshold checks, PGOOD function testing, switching-controller operation review, and incoming inspection according to notebook system-power production requirements.

Availability

TPS51225BRUKR is available at Aetrix Electronics and suitable for notebook system-power supplies, netbook and tablet DC/DC rails, dual 5 V / 3.3 V buck regulation, and Out-of-Audio™ light-load power architectures requiring stable component supply and repeatable production support.

Supply support may include scheduled delivery planning, volume procurement support, BOM continuity assistance, traceable sourcing management, and long-term availability support for OEM manufacturers, portable-computer platform developers, power-module designers, and electronics production programs.

For production deployment, confirming the 20-pin RUK WQFN package, TPS51225B OOA light-load mode, 5.5 V to 24 V input range, 5 V / 3.3 V output-rail requirements, LDO always-on behavior, reel quantity, environmental specifications, and sourcing continuity helps reduce procurement risk and improve manufacturing stability.

Manufacturer

Texas Instruments supplies power-management controllers, regulators, supervisors, and interface products for computing, industrial, automotive, communication, and embedded systems. The TPS51225 family is part of TI's notebook system-power controller portfolio, combining dual synchronous buck control, integrated LDO rails, D-CAP™ regulation, current-limit programming, and system-status supervision in a compact WQFN package.

FAQ

What is TPS51225BRUKR used for?

TPS51225BRUKR is used for dual 5 V and 3.3 V synchronous buck power supplies in notebook computers, netbooks, tablets, and related portable-computer system-power designs.

What makes TPS51225BRUKR different from TPS51225RUKR?

TPS51225BRUKR is the TPS51225B version and uses Out-of-Audio™ light-load operation. TPS51225RUKR uses Auto-skip light-load operation, while both devices share the same 20-pin RUK WQFN package and 5 V / 3.3 V dual buck controller role.

What package is used by TPS51225BRUKR?

TPS51225BRUKR uses the 20-pin RUK WQFN package with a 3 mm × 3 mm body, 0.4 mm pitch, 0.8 mm maximum height, and exposed thermal pad. The BRUKR ordering option is supplied in 3000-unit large tape-and-reel packaging.

What should be considered in TPS51225BRUKR pinout design?

TPS51225BRUKR pinout design should keep VFB1 / VFB2 traces short and quiet, place VREG5 and VREG3 bypass capacitors close to the IC, route DRVH / SW bootstrap paths and DRVL gate-drive traces with low parasitic inductance, connect CS1 / CS2 to the selected overcurrent-setting network, and solder the exposed thermal pad to the ground plane.

What are common TPS51225BRUKR equivalent options?

Common comparison options include TPS51225BRUKT for the same B-version function in 250-unit mini reel packaging, TPS51225RUKR for Auto-skip light-load operation, and TPS51225CRUKR for Auto-skip operation with both VREG3 and VREG5 always-on LDO behavior.