Texas Instruments TPS54719RTET

Overview

TPS54719RTET from Texas Instruments is a 2.95-V to 6-V input, 7-A synchronous step-down DC/DC converter with integrated 30-mΩ high- and low-side MOSFETs, 0.6 V ±1.5% reference voltage, and adjustable 200 kHz–2 MHz switching frequency. It delivers point-of-load regulation for FPGAs and microprocessors in space-constrained industrial and communications systems.

For engineers reviewing the TPS54719RTET datasheet, TPS54719RTET pinout, TPS54719RTET application, or TPS54719RTET equivalent, key selection criteria include its thermally enhanced 3-mm × 3-mm QFN-16 package, cycle-by-cycle current limiting, pre-bias start-up capability, and open-drain PWRGD signal with 93–108% output voltage monitoring window.

Technical Context

The TPS54719RTET implements peak current mode control with internal slope compensation to prevent subharmonic oscillation across 0–95% duty cycles. Its transconductance error amplifier (250 μA/V normal, 85 μA/V during slow-start) interfaces with external RC compensation on the COMP pin for stable loop response.

It features a bootstrap gate-drive architecture enabling near 100% duty cycle operation when BOOT–PH ≥ 2.1 V, and integrates UVLO hysteresis (0.2 V), thermal shutdown (150–155°C), and frequency foldback during overcurrent events - all without requiring external protection components.

Key Specifications

Pinout & Package

TPS54719RTET is housed in a thermally enhanced 3-mm × 3-mm, 16-pin QFN package (RTE) with an exposed PowerPAD™ ground pad (Pin 17) requiring multiple vias to inner-layer ground planes for optimal thermal performance.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous step-down converter applications.

Compared with TPS54719RTET, TPS54619RTET offers identical functionality at lower current capacity and cost, while MP2315DJ-LF-Z trades sequencing flexibility and precision for wider input range and smaller footprint - making each suitable only for distinct system-level priorities.

Availability

TPS54719RTET is available at Aetrix Electronics and suitable for FPGA power delivery, optical infrastructure systems, and industrial edge AI processors requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TPS54719RTET 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 technologies with over 90 years of innovation in high-reliability power conversion solutions.

The TPS54719RTET belongs to TI's SWIFT™ family of high-current synchronous buck converters, designed specifically for high-density point-of-load applications in networking, telecom, and industrial computing where efficiency, thermal performance, and sequencing control are critical.

FAQ

What is the minimum input voltage required for TPS54719RTET to begin switching?

The TPS54719RTET begins switching when the VIN pin rises above the internal undervoltage lockout (UVLO) threshold of 2.4 V (typical), with 0.2 V hysteresis. This ensures reliable startup from 2.95-V minimum specified input. The EN pin can be used to raise this threshold externally using a resistor divider, but the default turn-on point remains 2.4 V. TPS54719RTET will not initiate regulation until VIN exceeds this level, even if EN is asserted.

Does TPS54719RTET support powering into a pre-charged output capacitor?

Yes, TPS54719RTET supports safe start-up into a pre-biased output. Its internal circuitry prevents reverse current flow through the low-side MOSFET during startup, eliminating output voltage overshoot and protecting downstream components. This behavior is enabled by default and requires no external components - a key requirement for hot-swap and multi-rail systems where TPS54719RTET may be powered after other rails are already active.

How is the switching frequency set on TPS54719RTET, and what is the recommended RT resistor value for 500 kHz operation?

The switching frequency of TPS54719RTET is set by connecting a resistor between the RT pin and GND. For 500 kHz operation, a nominal 76-kΩ resistor is recommended based on TI's RT-to-f_SW characterization curve. The actual value may require minor adjustment (±5%) to compensate for resistor tolerance and board parasitics. Frequency accuracy is ±10% over temperature and input voltage, and the RT pin accepts values from ~20 kΩ (2 MHz) to ~200 kΩ (200 kHz). TPS54719RTET does not support external clock synchronization.

What is the function of the SS/TR pin on TPS54719RTET, and how is it used for power supply sequencing?

The SS/TR pin on TPS54719RTET serves dual roles: slow-start control (via external capacitor) and voltage tracking (via external resistor network). For sequencing, it can be driven by another regulator's PWRGD signal or connected to a reference voltage to coordinate ramp timing across multiple rails. When used for tracking, the TPS54719RTET regulates to the lower of the SS/TR voltage or its internal 0.6-V reference - enabling ratio-metric or sequential start-up without additional ICs. TPS54719RTET internally charges the SS/TR node at 2.4 µA, defining ramp rate.

Can TPS54719RTET operate at 100% duty cycle, and under what conditions?

TPS54719RTET supports near 100% duty cycle operation when the BOOT–PH voltage remains ≥2.1 V, allowing the high-side MOSFET to stay on continuously during dropout conditions. This occurs when input voltage approaches the output voltage (e.g., 3.3 V input → 3.3 V output). The internal BOOT UVLO monitors this voltage and disables the high-side switch only when BOOT–PH drops below threshold - enabling low-dropout operation without external components. TPS54719RTET does not support true 100% duty cycle with zero dropout, but achieves >95% effective duty cycle in practical designs.