Texas Instruments TPS54628DDAR

Overview

TPS54628DDAR from Texas Instruments is a 6-A synchronous step-down DC/DC converter with D-CAP2™ adaptive on-time control, operating from 4.5 V to 18 V input and delivering adjustable output voltage from 0.76 V to 5.5 V. It integrates 36 mΩ high-side and 28 mΩ low-side N-channel MOSFETs, supports 650-kHz pseudo-fixed switching frequency, and features Eco-Mode™ for high light-load efficiency - used in digital TV power supplies and networking home terminals.

For engineers reviewing the TPS54628DDAR datasheet, TPS54628DDAR pinout, TPS54628DDAR application, or TPS54628DDAR equivalent, key selection considerations include its integrated FETs, D-CAP2™ transient response, SO PowerPAD thermal performance, soft-start adjustability, and cycle-by-cycle overcurrent protection.

Technical Context

The TPS54628DDAR implements D-CAP2™ mode control using an adaptive on-time architecture that eliminates external compensation while enabling fast load-transient response. Its internal one-shot timer dynamically adjusts on-time based on VIN and VOUT to maintain ~650 kHz operation across input and output ranges.

It supports seamless transition between PWM and Eco-Mode™ operation, uses valley-current sensing for cycle-by-cycle overcurrent protection, and includes dedicated circuitry for prebiased soft start, output discharge control, and temperature-compensated current limit detection - all within an 8-pin SO PowerPAD package rated for –40°C to 85°C operation.

Key Specifications

Pinout & Package

TPS54628DDAR is housed in an 8-pin SO PowerPAD (DDA) package (4.89 mm × 3.90 mm) with exposed thermal pad soldered to GND for enhanced thermal dissipation (R_θJA = 43.5°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54628DDAR, TPS54620RGYR provides superior thermal metrics but requires external bias, while MP2315GJ-Z offers broader input range and lower BOM cost but sacrifices Eco-Mode™ efficiency and robust startup behavior.

Availability

TPS54628DDAR is available at Aetrix Electronics and suitable for digital TV power supplies, networking home terminals, and Blu-ray disc players requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS54628DDAR 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-reliability DC/DC conversion solutions.

The TPS54628DDAR belongs to TI's D-CAP2™ synchronous buck converter product line, designed specifically for high-efficiency, low-component-count point-of-load regulation in space- and thermal-constrained consumer and industrial systems.

FAQ

What is the maximum output current capability of the TPS54628DDAR?

The TPS54628DDAR delivers up to 6 A continuous output current under recommended operating conditions (T_A ≤ 85°C, proper PCB thermal design). Its current limit is specified at 6.7–8.9 A depending on inductor value and ambient conditions, and thermal shutdown activates at 165°C to protect against sustained overload. The device maintains regulation across its full 6-A range with typical efficiency >90% at 12 V_IN/1.05 V_OUT. TPS54628DDAR integrates optimized 36 mΩ/28 mΩ MOSFETs to minimize conduction loss at full load.

Does the TPS54628DDAR support prebiased output startup?

Yes, the TPS54628DDAR includes proprietary prebiased soft-start circuitry that prevents reverse current flow during startup when the output is already charged. It achieves this by initially applying narrow low-side gate pulses and incrementally increasing on-time until reaching normal duty-cycle operation - ensuring smooth, controlled ramp-up without damaging downstream components. This feature is enabled automatically and requires no external configuration. TPS54628DDAR's VFB input stage and SS pin control logic are specifically designed to detect and respond to prebias conditions.

What package type and thermal characteristics does the TPS54628DDAR use?

The TPS54628DDAR is packaged in an 8-pin SO PowerPAD (DDA) with a 4.89 mm × 3.90 mm body and exposed thermal pad soldered to PCB ground. Its thermal metrics include R_θJA = 43.5°C/W (junction-to-ambient), R_θJB = 25.6°C/W (junction-to-board), and R_θJC(bot) = 5.2°C/W (junction-to-case bottom), enabling effective heat transfer through the thermal pad. The device operates across –40°C to 85°C ambient temperature and includes thermal shutdown at 165°C. TPS54628DDAR's SO PowerPAD construction balances manufacturability, thermal performance, and cost for mid-power applications.

How does Eco-Mode™ improve light-load efficiency in the TPS54628DDAR?

Eco-Mode™ in the TPS54628DDAR enables discontinuous conduction mode (DCM) at light loads by turning off the low-side FET when inductor current reaches zero, eliminating reverse recovery losses and reducing switching frequency. This lowers quiescent current to <10 µA in shutdown and maintains >85% efficiency at 10 mA output - critical for standby operation in consumer electronics. The transition to Eco-Mode™ is automatic and seamless, with no external configuration required. TPS54628DDAR's control loop continuously monitors load and adapts mode without compromising regulation accuracy or transient response.

Can the TPS54628DDAR operate without an external compensation network?

Yes, the TPS54628DDAR uses D-CAP2™ adaptive on-time control, which eliminates the need for external compensation components such as Type II or Type III error amplifier networks. Stability is achieved internally through a combination of feedforward control, internal ramp injection, and adaptive timing - allowing direct use with ceramic or low-ESR polymer output capacitors. This simplifies design, reduces BOM count, and improves transient response versus traditional voltage-mode or current-mode controllers. TPS54628DDAR's D-CAP2™ architecture is validated across its full input/output operating range per TI's SLVSBW5A datasheet.