Texas Instruments TPS54328DDAR

Overview

TPS54328DDAR from Texas Instruments is a 3-A synchronous step-down DC/DC converter with integrated high-side (100 mΩ) and low-side (70 mΩ) N-channel MOSFETs, D-CAP2™ adaptive on-time control, 700-kHz switching frequency, and Eco-Mode™ for light-load efficiency - used in digital TV power supplies and STB main rail regulation.

For engineers reviewing the TPS54328DDAR datasheet, TPS54328DDAR pinout, TPS54328DDAR application, or TPS54328DDAR equivalent, key selection considerations include input voltage range (4.5–18 V), output voltage adjustability (0.76–7 V), thermal performance in HSOP-8 package, and compatibility with ceramic output capacitors without external compensation.

Technical Context

The TPS54328DDAR implements D-CAP2™ mode control using adaptive on-time PWM, eliminating need for external compensation while enabling fast transient response. Its internal one-shot timer sets on-time based on VIN and VOUT to maintain pseudo-constant 700-kHz operation across input voltage variations.

Eco-Mode™ enables automatic pulse-skipping at light loads to sustain high efficiency below 10% load, while cycle-by-cycle valley-current overcurrent protection monitors low-side FET voltage during conduction to detect overload conditions without sensing resistors.

Key Specifications

Pinout & Package

TPS54328DDAR is housed in an 8-pin HSOP (4.89 mm × 3.90 mm) package with exposed thermal pad connected to GND for enhanced thermal dissipation. Pin numbering follows top-view orientation with thermal pad soldered to PCB ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54328DDAR, TPS54327DDAR offers reduced conduction loss at lighter loads but sacrifices 0.5-A peak capability, while MP2332HGRT-Z trades D-CAP2™'s zero-compensation advantage for simpler EMI filtering - making TPS54328DDAR optimal for space-constrained, high-transient consumer power rails.

Availability

TPS54328DDAR is available at Aetrix Electronics and suitable for digital TV power supplies, Blu-ray player main rails, and networking home terminal designs requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for TPS54328DDAR 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 TPS54328DDAR belongs to TI's D-CAP2™ synchronous buck converter product line, engineered specifically for cost-sensitive, high-transient consumer electronics requiring minimal external components and robust light-load efficiency.

FAQ

What is the maximum recommended output current for TPS54328DDAR in continuous conduction mode?

The TPS54328DDAR is rated for 3-A continuous output current in CCM under recommended operating conditions (T_A ≤ 85°C, proper PCB thermal design). Its overcurrent limit is specified at 3.5–5.7 A depending on temperature, but sustained operation above 3 A requires derating due to thermal constraints in the HSOP-8 package. The device's 100-mΩ high-side and 70-mΩ low-side MOSFETs define its conduction loss envelope, and thermal metrics (R_θJA = 42.1°C/W) confirm 3-A capability with adequate copper area and airflow.

Does TPS54328DDAR support pre-biased output startup, and how does it work?

Yes, TPS54328DDAR supports pre-biased soft start. When the output voltage is already present at startup, the device avoids sinking current by initially enabling the low-side FET with narrow, incrementally increasing on-times until reaching normal duty-cycle operation. This prevents output voltage collapse and ensures smooth ramp-up into regulation. The feature is implemented entirely internally - no external components or configuration are required. It is active whenever the feedback voltage (VFB) exceeds the internal soft-start voltage at power-on, and is confirmed in the datasheet's Section 7.3.4.

What is the purpose of the VREG5 pin on TPS54328DDAR, and what load can it drive?

The VREG5 pin on TPS54328DDAR is an internal 5.5-V LDO that powers the gate drivers and internal logic. It delivers up to 10 mA and must be decoupled with a 1-µF ceramic capacitor to GND. VREG5 is inactive when EN is low, and its output voltage remains within 5.2–5.7 V across input voltage (6–18 V) and load (0–5 mA) variations. It also supplies the internal bootstrap diode connecting to VBST, eliminating need for external bias supplies - a key enabler of the device's monolithic, low-component-count design.

Can TPS54328DDAR operate with only ceramic output capacitors, and why is this significant?

Yes, TPS54328DDAR is explicitly designed to operate stably with ceramic output capacitors alone (22–68 µF typical), thanks to its D-CAP2™ control architecture and internal ripple-simulation circuit. Unlike traditional voltage-mode or current-mode controllers, it does not rely on ESR-induced output ripple for loop stability. This eliminates the need for bulk electrolytic or polymer capacitors, reducing solution size, cost, and failure risk while improving reliability and transient response - a critical advantage in slim-profile consumer devices like digital TVs and STBs.

What thermal considerations apply to TPS54328DDAR in the HSOP-8 (DDA) package?

For TPS54328DDAR in the HSOP-8 (DDA) package, thermal performance depends critically on soldering the exposed thermal pad to a minimum 100 mm² copper area connected to GND. With this layout, R_θJA is 42.1°C/W and R_θJC(bot) is 7.1°C/W - meaning junction-to-board conduction dominates heat removal. At 3-A load and 12-V input, power dissipation is ~0.6 W; with 42.1°C/W, ΔT_JA ≈ 25°C above ambient, keeping T_J well below the 150°C absolute max. Thermal shutdown activates at 165°C with 30°C hysteresis, providing robust protection during overload or poor layout scenarios.