Texas Instruments TPS54335-2ADRCR

Overview

TPS54335-2ADRCR 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 adjustable switching frequency (50 kHz–1.5 MHz), 0.8-V ±0.8% reference voltage, 2-ms internal soft-start, and hiccup-mode overcurrent protection - deployed in industrial power supplies, LCD displays, and distributed 5/12/24-V bus systems.

For engineers reviewing the TPS54335-2ADRCR datasheet, TPS54335-2ADRCR pinout, TPS54335-2ADRCR application, or TPS54335-2ADRCR equivalent, key selection considerations include its VSON-10 package thermal performance (R_θJA = 43.9°C/W), monotonic pre-biased startup capability, pulse-skipping light-load efficiency, BOOT-PH UVLO threshold (2.1 V), and EN pin enable hysteresis (1.10 V / 1.28 V).

Technical Context

This device implements fixed-frequency peak current-mode control with cycle-by-cycle high-side MOSFET current limiting (4.0–6.5 A) and low-side sourcing/sinking current limits (3.5–6.1 A / 0 A). The error amplifier (1300 µA/V transconductance) drives the COMP pin for external compensation, while slope compensation prevents subharmonic oscillation at duty cycles >50%.

Startup behavior includes monotonic pre-biased output handling via synchronized soft-start voltage ramping, and overvoltage transition protection activates when V_SENSE exceeds 106% of nominal, forcing high-side shutdown until recovery to 104%. Thermal shutdown triggers at 175°C (typ.) with 10°C hysteresis and 32768-cycle hiccup restart timing.

Key Specifications

Pinout & Package

The TPS54335-2ADRCR uses a 10-pin VSON package (3.0 mm × 3.0 mm) with exposed thermal pad, optimized for high-density PCB layouts and efficient heat dissipation through multiple vias to internal ground planes.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54335-2ADRCR, TPS543320RJER offers higher current and integration at the expense of board space and cost, while MP2335GJ-Z trades protection and precision for lower price - making TPS54335-2ADRCR the balanced choice for industrial and automotive applications demanding reliability, accuracy, and thermal robustness.

Availability

TPS54335-2ADRCR is available at Aetrix Electronics and suitable for industrial power supplies, LCD display backlights, smart meter power rails, and car audio DSP supplies requiring stable component supply and long-term manufacturability.

Supply support for TPS54335-2ADRCR 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 and manufacturing.

The TPS54335-2A product line delivers highly integrated, thermally robust synchronous buck converters targeting industrial, automotive, and consumer applications requiring reliable, efficient, and easy-to-design DC-DC solutions.

FAQ

What is the minimum input voltage required for stable operation of the TPS54335-2ADRCR?

The TPS54335-2ADRCR requires a minimum input voltage of 4.5 V for stable operation, as specified in its recommended operating conditions. Below this threshold, the internal undervoltage lockout (UVLO) circuit disables switching to prevent erratic behavior. The UVLO has a hysteresis of 180 mV, so the device re-enables only when VIN rises above ~4.68 V after dropout. This ensures clean startup and shutdown sequencing in systems with fluctuating input rails.

Does the TPS54335-2ADRCR support monotonic startup into a pre-biased output?

Yes, the TPS54335-2ADRCR 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 present on the VSENSE pin. This prevents reverse current flow and output voltage droop, making TPS54335-2ADRCR suitable for hot-swap and redundant power applications where downstream circuitry may already be powered.

What is the purpose of the BOOT pin on the TPS54335-2ADRCR, and what capacitor value is recommended?

The BOOT pin on the TPS54335-2ADRCR provides gate-drive voltage for the integrated high-side MOSFET via a bootstrap capacitor connected between BOOT and PH. A 0.1-µF ceramic capacitor (X7R or X5R dielectric, ≥10-V rating) is recommended to ensure stable boot voltage under all load and frequency conditions. If the BOOT-PH voltage falls below 2.1 V (typ.), the high-side FET turns off to allow recharge - critical for maintaining continuous conduction mode at high duty cycles.

How does the TPS54335-2ADRCR protect against overcurrent conditions?

The TPS54335-2ADRCR implements dual-stage overcurrent protection: cycle-by-cycle limiting on the high-side MOSFET (4.0–6.5 A) and low-side sourcing/sinking current limits (3.5–6.1 A / 0 A). If overload persists beyond 512 switching cycles, it enters hiccup mode - disabling output for 16384 cycles before attempting restart. This reduces average power dissipation and prevents thermal runaway during sustained short-circuit or overload events, preserving long-term reliability of TPS54335-2ADRCR in field-deployed systems.

Can the switching frequency of the TPS54335-2ADRCR be adjusted, and how is it set?

Yes, the switching frequency of the TPS54335-2ADRCR is adjustable from 50 kHz to 1.5 MHz using an external resistor connected between the RT pin and GND. For example, a 100-kΩ resistor sets frequency to ~480 kHz, while a 30-kΩ resistor achieves ~1.5 MHz. The relationship is approximately linear per datasheet curves, and frequency remains stable across temperature and input voltage variations - enabling precise EMI management and inductor size optimization in TPS54335-2ADRCR-based designs.