Texas Instruments TPS54335-1ADRCT

Overview

TPS54335-1ADRCT 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, ±0.8% accurate 0.8-V reference, and current-mode control for stable regulation in consumer power supplies and industrial bus converters.

For engineers reviewing the TPS54335-1ADRCT datasheet, TPS54335-1ADRCT pinout, TPS54335-1ADRCT application, or TPS54335-1ADRCT equivalent, key selection criteria include its VSON-10 (DRC) package thermal performance, RT-adjustable frequency tuning, monotonic pre-biased startup capability, hiccup-mode overcurrent protection, and compatibility with WEBENCH Power Designer for custom design validation.

Technical Context

The TPS54335-1ADRCT 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 to regulate output voltage via external resistor divider on VSENSE, while cycle-by-cycle high-side current limiting (4–6.5 A threshold) and low-side sourcing/sinking current limits protect against overload and reverse-current conditions.

Startup behavior is controlled by an internal 2-ms soft-start ramp that overrides the 0.8-V reference until complete, enabling monotonic rise into pre-biased outputs. The BOOT-PH UVLO (2.1 V typical) ensures reliable high-side gate drive, and overvoltage transition protection disables the high-side switch when VOUT exceeds 106% of nominal, re-enabling only after decay below 104%.

Key Specifications

Pinout & Package

The TPS54335-1ADRCT is housed in a 10-pin VSON package (DRC) with 3.00 mm × 3.00 mm body size and exposed thermal pad for enhanced thermal dissipation. Pin 1 is BOOT; pin 10 is RT; the thermal pad must be soldered to PCB ground plane using multiple vias.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54335-1ADRCT, TPS54335ADRCT offers identical electrical behavior in the same package, while TPS54336ADRCT trades frequency flexibility for deterministic EMI and programmable soft-start-making each suitable for distinct system-level trade-offs in cost, size, and compliance.

Availability

TPS54335-1ADRCT is available at Aetrix Electronics and suitable for digital TV power supplies, industrial 24-V bus converters, and smart meter battery chargers requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS54335-1ADRCT 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 and embedded processing technologies, with decades of expertise in power management ICs for industrial, automotive, and consumer markets.

The TPS5433xA family was designed specifically for high-efficiency, space-constrained synchronous buck conversion in mid-power applications-from 5-V/12-V consumer electronics to 24-V industrial bus systems-emphasizing integration, thermal performance, and robust protection.

FAQ

What is the function of the RT pin on the TPS54335-1ADRCT?

The RT pin on the TPS54335-1ADRCT sets the switching frequency by connecting an external resistor between RT and GND. A 100-kΩ resistor yields approximately 430 kHz, while values from 30 kΩ to 1 MΩ tune frequency from 1.5 MHz down to 50 kHz. This adjustment directly impacts output filter size, efficiency, and EMI profile-enabling optimization for specific application constraints without changing the TPS54335-1ADRCT layout.

Does the TPS54335-1ADRCT support monotonic startup into a pre-biased output?

Yes, the TPS54335-1ADRCT guarantees monotonic startup into pre-biased outputs by disabling both high-side and low-side MOSFETs until the internal 2-ms soft-start voltage exceeds the VSENSE pin voltage. This prevents reverse current flow through the low-side FET and avoids output voltage collapse or overshoot-critical for hot-plug interfaces like USB-C PD or PCIe add-in cards where the TPS54335-1ADRCT may power downstream regulators already holding charge.

What thermal performance can be expected from the TPS54335-1ADRCT in its VSON-10 package?

The TPS54335-1ADRCT in the DRC (VSON-10) package achieves RθJB = 18.9 °C/W when the exposed thermal pad is properly soldered to a 4-layer PCB with ≥6 thermal vias to an internal ground plane. At 3-A load and 12-V input, this enables junction temperatures ≤115°C under 65°C ambient-well within the 150°C maximum rating-without heatsink or airflow, making the TPS54335-1ADRCT suitable for compact, sealed industrial enclosures.

How does the TPS54335-1ADRCT implement overvoltage protection?

The TPS54335-1ADRCT uses an overvoltage power-good comparator that monitors VOUT via the VSENSE divider. When VOUT exceeds 106% of the nominal output, the high-side MOSFET is immediately disabled and held off until VOUT decays below 104%. This two-threshold hysteresis prevents chatter and protects sensitive downstream loads-such as FPGAs or ADCs powered by the TPS54335-1ADRCT-from overvoltage stress during line transients or light-load conditions.

Can the TPS54335-1ADRCT operate with input voltages below 4.5 V?

No, the TPS54335-1ADRCT has a specified minimum input voltage of 4.5 V per its absolute maximum and recommended operating conditions. Below this, the internal UVLO circuit disables switching, and the device enters shutdown with 2-µA quiescent current. Attempting operation at 4.0 V or lower risks failure to start or unstable regulation-so designs requiring sub-4.5-V operation must select a different buck converter, not rely on marginal use of the TPS54335-1ADRCT.