Texas Instruments TPS54319RTER

Overview

TPS54319RTER 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, fixed-frequency peak-current-mode control, and 0.827 V ±3% internal voltage reference. It delivers regulated 1.8 V output at up to 3 A in compact point-of-load applications such as LCD displays and set-top boxes.

For engineers reviewing the TPS54319RTER datasheet, TPS54319RTER pinout, TPS54319RTER application, or TPS54319RTER equivalent, key selection considerations include its 300–2000 kHz adjustable switching frequency, thermal shutdown (165°C), power-good output with 2% hysteresis, and support for slow-start sequencing via SS/TR pin.

Technical Context

The TPS54319RTER implements constant-frequency peak-current-mode control with internal slope compensation to prevent subharmonic oscillation across duty cycles. Its error amplifier features 245 m℧ transconductance during regulation and reduced gm (79 m℧) during slow start to improve transient response.

Switching is synchronized via PLL on the RT/CLK pin, supporting external clock input or resistor-programmed frequency (e.g., 400–600 kHz with 400 kΩ). The BOOT-PH UVLO (2.2 V) enables near-100% duty-cycle operation, while frequency foldback protects during overcurrent events.

Key Specifications

Pinout & Package

TPS54319RTER uses a thermally enhanced 3 mm × 3 mm, 16-pin QFN package with exposed PowerPAD (Pin 17) for GND connection and thermal dissipation. The package supports ≤51.7°C/W junction-to-ambient thermal resistance on standard PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS54319RTER, TPS54318RTER omits PWRGD for lower cost in non-critical rails, while MP2315DJ-LF-Z trades control flexibility for broader input range and simpler layout-making TPS54319RTER optimal for 3–5 V systems needing sequencing, monitoring, and EMI control.

Availability

TPS54319RTER is available at Aetrix Electronics and suitable for consumer electronics, industrial IoT sensor hubs, and LCD display power systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance.

Supply support for TPS54319RTER 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 TPS54319RTER belongs to TI's SWIFT™ synchronous buck converter family, designed specifically for space-constrained, high-density point-of-load applications demanding precision regulation, thermal robustness, and flexible sequencing.

FAQ

What is the minimum controllable on-time for TPS54319RTER?

The TPS54319RTER has a minimum controllable on-time of 65 ns at full 3 A load and 120 ns at no load. This parameter limits the maximum achievable input-to-output voltage ratio at high switching frequencies-for example, at 2 MHz and 1.8 V output, VIN must remain ≤5.5 V to maintain regulation. Designers must verify on-time margin using the worst-case VIN and VOUT combination in their application.

How does the TPS54319RTER implement power-good monitoring?

The TPS54319RTER uses an internal comparator to monitor VSENSE against 93% and 107% of the 0.827 V reference. When VOUT falls below 93% or rises above 107% of target, the open-drain PWRGD pin pulls low (≤0.6 V at 3 mA sink). Hysteresis is fixed at 2% of VREF, and the output remains asserted until VOUT re-enters the valid window-enabling reliable system reset and sequencing control in the TPS54319RTER design.

Can TPS54319RTER operate with 100% duty cycle?

Yes-the TPS54319RTER supports near-100% duty cycle operation as long as BOOT-PH voltage remains above 2.2 V. When BOOT-PH drops below this threshold, the high-side MOSFET is disabled and the low-side FET conducts continuously, maintaining output regulation during dropout conditions. This behavior is enabled by the internal BOOT UVLO circuit and allows operation with VIN as low as ~VOUT + 0.3 V under light loads.

What is the role of the SS/TR pin in TPS54319RTER?

The SS/TR pin in the TPS54319RTER serves dual functions: slow-start control and voltage tracking. Internally sourced with 2.2 mA, it charges an external capacitor to set output ramp time; the error amplifier regulates to the lower of SS/TR voltage or 0.827 V reference. During tracking, it accepts external voltage references to coordinate startup with other rails-ensuring repeatable, controlled power-up sequences in multi-supply systems using the TPS54319RTER.

How is switching frequency programmed on TPS54319RTER?

Switching frequency on the TPS54319RTER is programmed via a resistor from RT/CLK pin to GND, setting frequency from 300 kHz to 2000 kHz. With a 400 kΩ resistor, typical fSW is 400–600 kHz. The pin also accepts external clock signals (300–2000 kHz, min 75 ns pulse width), and includes a PLL for synchronization-allowing precise timing alignment across multiple TPS54319RTER devices in complex power architectures.