Texas Instruments TPS54334DRCR

Overview

TPS54334DRCR from Texas Instruments is a 4.2 V to 28 V input, 3 A synchronous step-down DC/DC converter with integrated 128 mΩ/84 mΩ MOSFETs, fixed 570 kHz switching frequency, 0.8 V ±1.5% reference voltage, and power-good (PGOOD) monitoring - used in industrial power supplies, LCD displays, and distributed 5 V/12 V bus regulation.

For engineers reviewing the TPS54334DRCR datasheet, TPS54334DRCR pinout, TPS54334DRCR application, or TPS54334DRCR equivalent, key selection criteria include input UVLO threshold (4.2 V rising), shutdown quiescent current (2 µA), monotonic start-up into pre-biased outputs, hiccup-mode overcurrent protection, and thermal shutdown at 165 °C.

Technical Context

The TPS54334DRCR implements fixed-frequency peak current mode control with internal slope compensation to prevent subharmonic oscillation across duty cycles. Its transconductance error amplifier (1300 µA/V) drives the COMP pin for loop stability, while integrated boot recharge diode and BOOT-SW UVLO (2.2 V) enable reliable high-side gate drive.

Protection architecture includes cycle-by-cycle high-side current limiting (5.2 A typ), bidirectional low-side current limiting (sourcing 4.7 A / sinking 0 A), overvoltage detection (116% VREF), and thermal hiccup shutdown (32768 cycles). The device supports safe startup into pre-biased outputs via monotonic soft-start (2 ms) and EN pin floating-enable functionality.

Key Specifications

Pinout & Package

TPS54334DRCR uses a 10-pin VSON (DRC) package measuring 3.0 mm × 3.0 mm with exposed thermal pad on underside for enhanced heat dissipation. Pin 1 is BOOT; pins 3–5 are GND; pin 10 is PGOOD open-drain output.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MP2334HG-33-P and RTQ2134B-GQW, the TPS54334DRCR uniquely combines adjustable output voltage, monotonic pre-biased startup, 2 µA shutdown IQ, and hiccup-mode thermal/overcurrent recovery - making it optimal for industrial and safety-critical embedded power rails.

Availability

TPS54334DRCR is available at Aetrix Electronics and suitable for industrial power supplies, LCD display subsystems, and smart meter designs requiring stable component supply, long-lifecycle availability, and traceable sourcing.

Supply support for TPS54334DRCR 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 TPS54334DRCR belongs to TI's SWIFT™ family of synchronous buck converters, designed specifically for high-efficiency, low-EMI, and thermally robust point-of-load regulation in industrial, consumer, and communications equipment.

FAQ

What is the minimum input voltage required for TPS54334DRCR to assert PGOOD?

The TPS54334DRCR asserts PGOOD only when VIN exceeds 4.2 V - below this, PGOOD remains low regardless of output voltage. At VIN ≥ 4.2 V, PGOOD transitions high when VSENSE reaches 90% of the 0.8 V reference (0.72 V), and stays asserted until VSENSE drops below 84% (0.672 V) or rises above 116% (0.928 V). This ensures reliable power sequencing in multi-rail systems.

Can TPS54334DRCR operate with a 100% duty cycle?

The TPS54334DRCR can sustain 100% duty cycle only if the BOOT-SW voltage remains above 2.2 V - which requires sufficient SW node switching activity to recharge the bootstrap capacitor. However, TI explicitly warns against operating TPS54334DRCR at 100% duty cycle under no-load conditions, as boot capacitor depletion will force shutdown. For true dropout operation, use a different topology.

How does the TPS54334DRCR handle overcurrent faults?

The TPS54334DRCR employs dual-stage overcurrent protection: cycle-by-cycle limiting triggers at 5.2 A (high-side) and 4.7 A (low-side sourcing), while hiccup mode activates after 512 consecutive overcurrent cycles. Once triggered, the device disables switching for 16384 cycles before auto-restarting - limiting average power dissipation and preventing thermal runaway during sustained shorts.

What is the recommended capacitor for the BOOT pin on TPS54334DRCR?

Texas Instruments specifies a 0.1 µF ceramic capacitor between BOOT and SW pins for the TPS54334DRCR, using X7R or X5R dielectric with ≥10 V rating. This value ensures adequate charge storage for high-side gate drive while minimizing ESR and maintaining stable capacitance across temperature and DC bias - critical for consistent MOSFET turn-on and efficiency.

Does TPS54334DRCR support adjustable output voltage?

Yes, the TPS54334DRCR supports fully adjustable output voltage from 0.8 V to 24 V using an external resistor divider on the VSENSE pin. The internal 0.8 V reference is accurate to ±1.5% over temperature, and TI recommends 1% tolerance resistors with R1 = 10 kΩ as a starting point - enabling precise regulation for diverse system voltage requirements.