Texas Instruments TPS54528DDAR

Overview

TPS54528DDAR from Texas Instruments is a 5-A synchronous step-down DC/DC converter with integrated 65 mΩ high-side and 36 mΩ low-side N-channel MOSFETs, operating from 4.5 V to 18 V input and delivering adjustable output voltage from 0.76 V to 6 V. It employs D-CAP2™ adaptive on-time control for fast transient response and supports Eco-mode™ for >90% efficiency at light loads in digital TV, STB, and networking terminal power rails.

For engineers reviewing the TPS54528DDAR datasheet, TPS54528DDAR pinout, TPS54528DDAR application, or TPS54528DDAR equivalent, key selection criteria include its 650-kHz switching frequency, cycle-by-cycle overcurrent protection, pre-biased soft-start capability, thermal shutdown at 165°C, and HSOP-8 package with exposed thermal pad for industrial-grade thermal management.

Technical Context

The TPS54528DDAR implements D-CAP2™ mode control using an adaptive on-time PWM architecture that eliminates external compensation components and enables stable operation with ultra-low-ESR ceramic output capacitors. Its internal reference maintains ±1% initial accuracy (765 mV), and feedback sensing occurs at the VFB pin with ±0.15 μA input bias current.

Functional modes include continuous conduction mode (CCM) at full load, discontinuous conduction mode (DCM) during light-load Eco-mode™ operation, and automatic transition between them. Protection features are implemented via valley-current sensing on the low-side FET, UVLO monitoring of the VREG5 rail, and non-latching thermal shutdown triggered at 165°C with 35°C hysteresis.

Key Specifications

Pinout & Package

TPS54528DDAR is housed in an 8-pin HSOP (DDA) package measuring 4.89 mm × 3.9 mm with an exposed thermal pad on the bottom side. The package requires soldering the thermal pad directly to a PCB ground plane using ≥4 thermal vias for effective heat dissipation under 5-A load conditions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54528DDAR, TPS54527DDAR offers identical functionality at reduced current rating and marginally better efficiency, while MP2359DJ-LF-Z trades advanced control features for lower unit cost and simpler layout-but requires careful loop tuning and lacks light-load optimization.

Availability

TPS54528DDAR is available at Aetrix Electronics and suitable for digital television power supply, high-definition Blu-ray disc player, and networking home terminal applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS54528DDAR 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 TPS54528DDAR belongs to TI's D-CAP2™ synchronous buck converter product line, engineered for high-density, low-EMI power delivery in consumer electronics where fast transient response, light-load efficiency, and minimal external components are critical.

FAQ

What is the recommended input capacitor configuration for TPS54528DDAR?

The TPS54528DDAR requires a minimum 10-μF ceramic input capacitor placed adjacent to the VIN and GND pins, plus an optional 0.1-μF high-frequency ceramic capacitor (C3) from VIN to GND. Total input capacitance should support peak input current ripple; for 5-A output at 12-V input, typical design uses two 10-μF X5R 25-V ceramics in parallel. TPS54528DDAR datasheet Section 9.2.2.3 specifies placement within 3 mm of the IC to minimize loop inductance.

Does TPS54528DDAR support output voltages below 1 V?

Yes, TPS54528DDAR supports output voltages from 0.76 V to 6 V, making it suitable for sub-1-V applications such as modern low-voltage processors and FPGAs. The 0.765-V internal reference has ±6 mV tolerance over temperature, enabling accurate 0.8-V or 0.85-V outputs using standard 1% resistor dividers. TPS54528DDAR maintains regulation stability and transient performance even at 0.76 V with appropriate output capacitor ESR and layout.

How does the pre-biased soft start function work in TPS54528DDAR?

TPS54528DDAR's pre-biased soft start prevents reverse current flow when the output is already charged at startup. It detects VFB > internal soft-start voltage and initiates low-side FET gate pulses with narrow, incrementally increasing on-time until reaching normal duty cycle-avoiding sink current into the pre-charged rail. This behavior is confirmed in TPS54528DDAR datasheet Section 8.3.1 and validated in Figure 14 startup waveforms.

What thermal design guidelines apply to TPS54528DDAR in HSOP-8 (DDA) package?

TPS54528DDAR in HSOP-8 requires soldering the exposed thermal pad to a dedicated PCB ground plane using ≥4 thermal vias (0.3-mm diameter, spaced ≤1 mm apart). TI specifies θ_JB = 25.6°C/W; achieving this demands ≥200 mm² copper area on inner layers connected to the pad. Layout Section 11.1 of the TPS54528DDAR datasheet mandates single-point GND connection and separation of power/ground paths from sensitive analog traces (VFB, SS).

Can TPS54528DDAR operate with only ceramic output capacitors?

Yes, TPS54528DDAR is explicitly designed for ceramic output capacitors, including ultra-low-ESR types. Its D-CAP2™ control architecture eliminates reliance on ESR-induced ripple for loop stability-unlike traditional voltage-mode controllers. Recommended values range from 22 μF to 68 μF total (e.g., two 22-μF X5R 6.3-V ceramics), as specified in Table 1 of the TPS54528DDAR datasheet for 1.05-V and other common output voltages.