Texas Instruments TPS54335ADDAR

Overview

TPS54335ADDAR from Texas Instruments is a synchronous step-down DC-DC converter with integrated 128-mΩ high-side and 84-mΩ low-side MOSFETs, delivering up to 3-A continuous output current across a 4.5-V to 28-V input range. It features internal 2-ms soft-start, adjustable switching frequency from 50 kHz to 1.5 MHz via external RT resistor, and a precision 0.8-V reference with ±0.8% accuracy over temperature - used in industrial power rails and consumer display supplies.

For engineers reviewing the TPS54335ADDAR datasheet, TPS54335ADDAR pinout, TPS54335ADDAR application, or TPS54335ADDAR equivalent, key selection criteria include its SO PowerPAD™ 8-pin package, current-mode control architecture, hiccup-mode overcurrent protection, monotonic startup into pre-biased outputs, and pulse-skipping light-load efficiency optimization.

Technical Context

The TPS54335ADDAR implements fixed-frequency peak current-mode control with slope compensation to prevent subharmonic oscillation at duty cycles >50%. Its error amplifier (1300 µmhos transconductance) drives the COMP pin for loop stability, while cycle-by-cycle high-side current limiting (4–6.5 A threshold) and low-side sourcing/sinking current limits enforce robust overload handling.

Startup behavior is controlled by an internal 2-ms soft-start ramp that overrides the 0.8-V reference until settled; the device supports monotonic startup into pre-biased outputs by inhibiting both MOSFETs until VSENSE < soft-start voltage. Overvoltage transition protection disables the high-side switch when VOUT exceeds 106% of nominal and re-enables only after falling below 104%.

Key Specifications

Pinout & Package

TPS54335ADDAR is housed in an 8-pin SO PowerPAD™ package (4.89 mm × 3.90 mm) with exposed thermal pad soldered to PCB ground plane for enhanced thermal dissipation (R_θJB = 31.8°C/W).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54335ADRCR, the TPS54335ADDAR offers identical regulation performance in a larger SO package with easier hand-soldering and thermal via access, while MP2335GJ-Z trades configurability for lower BOM count and wider input range - making TPS54335ADDAR optimal for thermally demanding, production-ready industrial designs requiring field-adjustable frequency.

Availability

TPS54335ADDAR is available at Aetrix Electronics and suitable for industrial power supplies, consumer display rails, battery charger auxiliary supplies, and distributed telecom bus converters requiring stable component supply across multi-year production cycles.

Supply support for TPS54335ADDAR 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-reliability power conversion solutions.

The TPS5433xA product line delivers highly integrated, thermally robust synchronous buck converters targeting industrial, automotive, and consumer power systems where efficiency, small solution size, and safe startup behavior are critical.

FAQ

What is the maximum output current capability of the TPS54335ADDAR?

The TPS54335ADDAR delivers up to 3 A of continuous output current under recommended operating conditions (T_J ≤ 150°C, proper PCB thermal design). This rating assumes adequate copper area on the PowerPAD™ thermal pad and ambient temperature ≤ 85°C. Peak current capability is limited by the 4–6.5 A high-side current-limit threshold and thermal shutdown at 160°C.

Does the TPS54335ADDAR support adjustable switching frequency, and how is it configured?

Yes, the TPS54335ADDAR supports adjustable switching frequency from 50 kHz to 1.5 MHz via an external resistor connected between the RT pin and GND. The relationship follows TI's RT vs f_SW curve: e.g., 100 kΩ yields ~430 kHz, 30 kΩ yields ~1.35 MHz. No capacitor or additional components are required - only the RT resistor sets frequency.

How does the TPS54335ADDAR handle startup into a pre-biased output voltage?

The TPS54335ADDAR implements monotonic startup into pre-biased outputs by disabling both high-side and low-side MOSFETs until the internal soft-start voltage exceeds the VSENSE pin voltage. This prevents reverse current flow from the pre-charged output into the converter, protecting downstream loads and avoiding potential latch-up or damage during hot-insertion scenarios.

What is the purpose of the BOOT pin on the TPS54335ADDAR, and what capacitor value is required?

The BOOT pin supplies gate drive voltage to the integrated high-side MOSFET via a bootstrap capacitor connected between BOOT and PH. A 0.1-µF X7R or X5R ceramic capacitor rated ≥10 V is required. If BOOT-PH voltage drops below 2.1 V (typical), the high-side switch turns off and the low-side switch turns on to recharge the capacitor, ensuring reliable high-side operation across all duty cycles.

Can the TPS54335ADDAR be used in battery-powered applications with strict quiescent current requirements?

Yes, the TPS54335ADDAR is well-suited for battery-powered applications: it draws only 2 µA in shutdown (VEN = 0 V) and employs pulse-skipping light-load mode to maintain high efficiency down to 10-mA output current. Its 310-µA typical non-switching operating current further reduces standby losses, extending runtime in always-on sensor nodes or portable chargers.