Texas Instruments TPS54335DRCT

Overview

TPS54335DRCT from Texas Instruments is a synchronous step-down DC-DC converter IC with integrated 128-mΩ high-side and 84-mΩ low-side MOSFETs, delivering up to 3-A continuous output current across a 4.5–28-V input range. It features internal 2-ms soft-start, adjustable 50–1500-kHz switching frequency via RT pin, 0.8-V ±0.8% reference voltage, and current-mode control for stable regulation in consumer power supplies and industrial distributed bus systems.

For engineers reviewing the TPS54335DRCT datasheet, TPS54335DRCT pinout, TPS54335DRCT application, or TPS54335DRCT equivalent, key selection considerations include its SO PowerPAD™ 8-pin package thermal performance, monotonic startup into pre-biased outputs, hiccup-mode overcurrent protection, and compatibility with standard buck compensation networks using the COMP pin.

Technical Context

The TPS54335DRCT implements fixed-frequency peak current-mode control with cycle-by-cycle high-side current limiting (4.0–6.5 A typical) and low-side sourcing/sinking current limits (3.5–6.1 A). Its error amplifier uses transconductance of 1300 µmhos and interfaces directly with external RC compensation on the COMP pin.

Startup behavior is governed by internal 2-ms soft-start ramp and monotonic pre-biased output handling-both high- and low-side FETs remain off until the soft-start voltage exceeds VSENSE. Overvoltage transition protection activates at 106% VOUT and resets at 104%, while BOOT-PH UVLO (2.1 V typical) ensures reliable high-side gate drive.

Key Specifications

Pinout & Package

TPS54335DRCT is housed in an 8-pin SO PowerPAD™ package (4.89 mm × 3.90 mm) with exposed thermal pad connected to GND for enhanced thermal dissipation. The PowerPAD must be soldered to a 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 TPS54335DRCT, TPS54335ADRCR offers identical performance in volume packaging, while MP2335GJ-Z trades frequency flexibility and thermal efficiency for simplified BOM-making TPS54335DRCT optimal for designs needing adjustable switching, tight thermal control, and prototyping-friendly reel size.

Availability

TPS54335DRCT is available at Aetrix Electronics and suitable for consumer digital TV power supplies, industrial distributed bus converters, and smart meter auxiliary rails requiring stable component supply across extended product lifecycles.

Supply support for TPS54335DRCT 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 IC design.

The TPS5433x product line was engineered for high-efficiency, space-constrained DC-DC conversion in consumer, industrial, and automotive applications-emphasizing integration, thermal robustness, and ease of loop compensation.

FAQ

What is the recommended BOOT capacitor value for TPS54335DRCT?

The recommended BOOT capacitor for TPS54335DRCT is 0.1 µF, using X7R or X5R dielectric ceramic with ≥10-V rating. This value ensures sufficient charge storage to maintain high-side gate drive during continuous conduction mode, especially at high duty cycles. TI specifies this value based on internal boot regulator characteristics and minimum BOOT-PH UVLO (2.1 V) recovery timing. Using the correct capacitor prevents premature high-side FET turn-off and improves overall converter stability.

Does TPS54335DRCT support monotonic startup into a pre-biased output?

Yes, TPS54335DRCT supports monotonic startup into pre-biased outputs. During startup, both the high-side and low-side MOSFETs remain disabled until the internal soft-start voltage exceeds the voltage on the VSENSE pin. This prevents reverse current flow from the pre-charged output into the converter, protecting downstream components and ensuring controlled voltage ramp-up. This behavior is confirmed in the device's functional description and is independent of external soft-start capacitor use, as TPS54335DRCT uses internal soft-start.

How do I calculate the RT resistor value for a target switching frequency with TPS54335DRCT?

To set the switching frequency of TPS54335DRCT, use the formula ƒSW (kHz) = 55300 / RRT (kΩ), where RRT is the resistor connected between RT and GND. For example, a 110-kΩ resistor yields ~503 kHz. TI provides a curve (Figure 16) and tolerance guidance: RRT values from 30 kΩ (1200–1800 kHz) to 1000 kΩ (40–60 kHz) are validated across temperature. Always verify final frequency with oscilloscope measurement due to oscillator tolerance and PCB parasitics affecting RT node.

What is the maximum output voltage achievable with TPS54335DRCT?

The maximum output voltage for TPS54335DRCT is 24 V, as specified in the Recommended Operating Conditions table. This limit arises from internal voltage stress margins and gate-drive capability under worst-case VIN = 28 V and high-duty-cycle operation. While the 0.8-V reference allows scaling via resistor divider, exceeding 24 V risks violating absolute maximum ratings on VSENSE and COMP pins and may trigger overvoltage transition protection prematurely. Designs requiring >24 V output must use a different topology or controller.

Can TPS54335DRCT operate with an input voltage lower than 4.5 V?

No, TPS54335DRCT cannot reliably operate below 4.5 V input. Its absolute minimum input voltage is 4.5 V per Recommended Operating Conditions, and the input UVLO rising threshold is 4.0–4.5 V with 180–400 mV hysteresis. Below 4.5 V, the device may not sustain switching, experience erratic regulation, or fail to start. For sub-4.5-V applications, consider TI's TPS54202 (2.5–6 V input) or similar low-input buck regulators instead of TPS54335DRCT.