Texas Instruments TPS54319RTET

Overview

TPS54319RTET from Texas Instruments is a 2.95–6 V input, 3-A synchronous step-down DC/DC converter with integrated 45-mΩ high-side and low-side MOSFETs, 0.827 V ±3% reference voltage, adjustable 300 kHz–2 MHz switching frequency via RT/CLK pin, and thermally enhanced 3 mm × 3 mm QFN-16 package with PowerPAD™. It delivers point-of-load regulation for consumer electronics power rails.

For engineers reviewing the TPS54319RTET datasheet, TPS54319RTET pinout, TPS54319RTET application, or TPS54319RTET equivalent, key selection considerations include its current-mode control architecture, 2.6 V internal UVLO threshold, PWRGD open-drain output with 93–107% VREF window, slow-start sequencing via SS/TR pin, and thermal shutdown at 165°C with 15°C hysteresis.

Technical Context

The TPS54319RTET implements peak current-mode control with slope compensation to prevent subharmonic oscillation across duty cycles up to 100%, enabled by BOOT-PH UVLO monitoring (2.2 V threshold) and integrated boot recharge diode. Its transconductance error amplifier (245 mS typical) compares VSENSE against either the 0.827 V internal reference or SS/TR voltage, supporting precise output regulation and tracking.

Switching frequency is set via resistor on RT/CLK (300–2000 kHz range) or synchronized to external clock using PLL; minimum on-time is 65 ns at full load. Overcurrent protection uses cycle-by-cycle current limit with 4.2–6.6 A threshold, while power-good logic asserts low when VSENSE falls outside 93–107% of nominal reference.

Key Specifications

Pinout & Package

TPS54319RTET is housed in a thermally enhanced 3 mm × 3 mm, 16-pin QFN package with exposed PowerPAD™ (Pin 17) requiring direct connection to PCB ground plane via multiple thermal vias. The package supports high-power density designs with junction-to-board thermal resistance of 22°C/W.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54319RTET, TPS54318RTET offers identical pinout and thermal performance but sacrifices frequency adjustability and clock sync-critical for noise-sensitive designs-while MP2315DJ-LF-Z trades input voltage range and output current for cost reduction, omitting essential features like PWRGD and programmable soft-start needed in consumer electronics.

Availability

TPS54319RTET is available at Aetrix Electronics and suitable for consumer electronics power management, point-of-load regulation in CPE equipment, and USB-powered peripheral designs requiring stable component supply and long-term manufacturability.

Supply support for TPS54319RTET 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-efficiency DC/DC conversion and automotive-grade reliability.

The TPS54319RTET belongs to TI's SWIFT™ family of integrated power converters, designed specifically for space-constrained, high-density consumer and communications applications demanding low-noise, thermally efficient, and feature-rich buck regulation.

FAQ

What is the minimum input voltage required for TPS54319RTET to operate?

The TPS54319RTET has a specified operating input voltage range of 2.95 V to 6 V. Its internal under-voltage lockout (UVLO) is set at 2.6 V, meaning the device will not start switching until VIN exceeds this threshold. Below 2.95 V, performance is not guaranteed per datasheet specifications, and operation may be unstable or non-functional. For reliable startup, ensure VIN remains ≥2.95 V under all load and temperature conditions.

How does the TPS54319RTET achieve 100% duty cycle operation?

The TPS54319RTET achieves near-100% duty cycle by monitoring the BOOT–PH voltage with an internal UVLO circuit (2.2 V threshold). When BOOT–PH drops below 2.2 V, the high-side MOSFET is disabled and the low-side MOSFET conducts continuously, allowing the output to track VIN minus diode drop. This enables dropout operation critical for Li-ion and USB applications where input and output voltages are closely spaced.

Can the TPS54319RTET be synchronized to an external clock, and what are the timing requirements?

Yes, the TPS54319RTET supports external clock synchronization via the RT/CLK pin using its internal PLL. The external clock must have a frequency between 300 kHz and 2 MHz, with minimum pulse width of 75 ns. PLL lock time is typically 14 ms. Synchronization ensures deterministic switching edges across multiple converters, reducing beat frequencies and simplifying EMI filter design in multi-rail systems.

What is the purpose of the SS/TR pin on the TPS54319RTET, and how is it used for power sequencing?

The SS/TR pin on the TPS54319RTET controls output voltage ramp rate (slow start) or tracks another voltage rail (tracking). It sources a precise 2.2 mA current to charge an external capacitor, setting startup time. For sequencing, connecting the PWRGD output of one TPS54319RTET to the EN pin of another ensures the second supply activates only after the first reaches regulation, preventing backfeeding and latch-up in complex power trees.

Does the TPS54319RTET include overvoltage protection, and how does it function?

Yes, the TPS54319RTET includes overvoltage protection via its PWRGD comparator. When VSENSE rises above 107% of the internal 0.827 V reference, the overvoltage comparator triggers, forcing the high-side MOSFET off and masking it from turning on until VSENSE falls below 105%. This prevents damaging output overshoot during load transients or light-load conditions, enhancing system reliability without external components.