Texas Instruments TPS54228DDA

Overview

TPS54228DDA from Texas Instruments is a 2-A synchronous step-down DC/DC converter with integrated high- and low-side N-channel MOSFETs, operating in D-CAP2™ adaptive on-time mode for fast transient response. It supports 4.5 V to 18 V input, delivers 0.76 V to 7 V adjustable output, features 700-kHz switching frequency, Eco-Mode™ for light-load efficiency, and operates across –40°C to 85°C ambient temperature - used in digital TV power supplies and Blu-ray disc player core rails.

For engineers reviewing the TPS54228DDA datasheet, TPS54228DDA pinout, TPS54228DDA application, or TPS54228DDA equivalent, key selection considerations include its D-CAP2™ control architecture, 155 mΩ/108 mΩ FET R_DS(on), cycle-by-cycle overcurrent protection, prebiased soft-start capability, and SOIC-8 (DDA) package thermal performance with R_θJA = 114.4°C/W.

Technical Context

The TPS54228DDA implements adaptive on-time D-CAP2™ control: on-time is set by VIN and VOUT to maintain ~700 kHz pseudo-fixed frequency without external compensation, while internal ramp injection enables stable operation with ceramic output capacitors. Its proprietary feedback path eliminates ESR dependency and supports ultra-low-ESR POSCAP/SP-CAP types.

It transitions seamlessly between PWM mode (continuous conduction) and Auto-Skip Eco-Mode™ (discontinuous conduction) based on load current. Cycle-by-cycle valley-current sensing on the low-side FET provides overcurrent protection, and thermal shutdown triggers at 165°C with 35°C hysteresis - both non-latching.

Key Specifications

Pinout & Package

TPS54228DDA uses an 8-pin SOIC (DDA) package with 4.89 mm × 3.90 mm body size and exposed thermal pad connected to GND. The package supports standard reflow and achieves R_θJA = 114.4°C/W under JEDEC JESD51-7 conditions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54228DDA, TPS54227DDA offers lower cost but reduced current capability and missing integrated bias, while MP2307DN-LF-Z extends input range at the expense of compensation complexity and slower transient response - making TPS54228DDA optimal for compact, high-performance consumer power rails.

Availability

TPS54228DDA is available at Aetrix Electronics and suitable for digital TV power supplies, Blu-ray disc player core rails, and networking home terminal SoC power delivery requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS54228DDA 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-efficiency DC/DC conversion and automotive-grade reliability.

The TPS54228DDA belongs to TI's D-CAP2™ synchronous buck converter product line, designed specifically for space-constrained, high-transient consumer electronics requiring minimal external components and ultra-low standby power.

FAQ

What is the maximum output current supported by the TPS54228DDA?

The TPS54228DDA is rated for continuous 2-A output current under recommended operating conditions (–40°C to 85°C, proper PCB layout, and thermal management). Its overcurrent limit is programmable via inductor selection and typically trips between 2.5 A and 4.7 A depending on package variant and external components - confirmed in Section 6.5 of the SLVSAU1E datasheet.

Does the TPS54228DDA require external compensation components?

No, the TPS54228DDA uses D-CAP2™ adaptive on-time control, which eliminates the need for external compensation components such as type-II or type-III networks. Stability is achieved internally through ramp injection and adaptive timing - enabling robust operation with ceramic output capacitors alone, as verified in the Functional Block Diagram (Figure 7) and Section 7.3.1.

Can the TPS54228DDA start up into a prebiased output?

Yes, the TPS54228DDA includes proprietary prebiased soft-start circuitry that prevents reverse current flow during startup. When the output voltage exceeds the soft-start command level, the controller gradually enables synchronous rectification using narrow, incrementing low-side gate pulses - ensuring smooth ramp-up without sinking current from the precharged rail, as detailed in Section 7.3.4.

What package type does the TPS54228DDA use, and what are its thermal characteristics?

The TPS54228DDA uses an 8-pin SOIC package designated "DDA" with 4.89 mm × 3.90 mm body size and exposed thermal pad soldered to GND. Its junction-to-ambient thermal resistance (R_θJA) is 114.4°C/W under JEDEC JESD51-7 conditions - documented in Table 6-4 and validated across production lots per TI's SLVSAU1E datasheet revision August 2016.

How does Eco-Mode™ improve light-load efficiency in the TPS54228DDA?

Eco-Mode™ in the TPS54228DDA enables automatic pulse-skipping at light loads, reducing switching losses and lowering quiescent current to 5–10 µA in shutdown. This mode activates below ~300 mA load, extending battery life in standby and reducing no-load power consumption - a key requirement for Energy Star®-compliant digital media devices, as specified in Section 1 and Figure 9 of the datasheet.