Texas Instruments TPS5450MDDAREP

Overview

TPS5450MDDAREP from Texas Instruments is a radiation-hardened, 5-A synchronous step-down DC/DC converter with integrated 110-mΩ high-side MOSFET, operating from 5.5 V to 36 V input and delivering adjustable output down to 1.22 V (±1.5% initial accuracy) at up to 5 A continuous current. It features fixed 500-kHz switching frequency, internal compensation, and is qualified for defense, aerospace, and medical applications across –55°C to 125°C.

For engineers reviewing the TPS5450MDDAREP datasheet, TPS5450MDDAREP pinout, TPS5450MDDAREP application, or TPS5450MDDAREP equivalent, key selection criteria include its radiation-tolerant EP-grade qualification, thermal shutdown trip point (135°C), 18-µA shutdown current, voltage feed-forward architecture for improved transient response, and SOIC-8 PowerPAD™ package with exposed thermal pad requiring PCB vias.

Technical Context

The TPS5450MDDAREP implements voltage-mode PWM control with an internally trimmed 1.221-V bandgap reference and type-3 internal compensation, eliminating external compensation components. Its oscillator is fixed at 500 kHz (±12.5% over temperature), enabling compact filter design with inductors typically 10–100 µH.

Protection architecture includes cycle-by-cycle overcurrent limiting (6.0–11.7 A range), hiccup-mode recovery, overvoltage protection triggered at 112.5% × VREF, undervoltage lockout with 5.3-V start threshold and 330-mV hysteresis, and thermal shutdown at 135°C with 14°C hysteresis - all fully integrated without external sensing circuitry.

Key Specifications

Pinout & Package

The TPS5450MDDAREP is housed in an 8-pin SOIC PowerPAD™ (DDA) package with exposed thermal pad (Pin 9), requiring solder connection to PCB ground plane and ≥4 thermal vias for rated 5-A performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM5005MHX/NOPB, TPS5450MDDAREP delivers higher output current with integrated FET and internal compensation, reducing BOM count; compared with TPS5430DDAR, it adds radiation-hardened EP qualification, wider temperature range, and lower rDS(on), making it suitable for mission-critical deployments where reliability outweighs cost.

Availability

TPS5450MDDAREP is available at Aetrix Electronics and suitable for high-reliability defense electronics, aerospace power management, and medical equipment requiring stable component supply across extended temperature and radiation-exposed environments.

Supply support for TPS5450MDDAREP 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 decades of heritage in high-reliability aerospace and defense components.

The TPS5450MDDAREP belongs to TI's SWIFT™ family of integrated DC/DC converters, designed specifically for high-density, radiation-tolerant point-of-load regulation in harsh-environment systems where minimal external components and guaranteed long-term availability are essential.

FAQ

What is the maximum input voltage rating for the TPS5450MDDAREP?

The TPS5450MDDAREP has an absolute maximum input voltage rating of 40 V on the VIN pin, but its recommended operating input voltage range is 5.5 V to 36 V. Exceeding 36 V risks violating functional specifications and may trigger overvoltage protection or damage the internal MOSFET. The 40-V absolute max is a stress limit - not a functional operating condition - and should never be approached in design.

Does the TPS5450MDDAREP require external compensation components?

No, the TPS5450MDDAREP uses internal type-3 compensation optimized for voltage-mode control, eliminating the need for external resistors or capacitors in the feedback loop. This simplifies layout, improves stability across temperature, and reduces bill-of-materials cost. The internal compensation is calibrated to work with standard LC output filters using inductors from 10 µH to 100 µH and ceramic or polymer output capacitors.

How does the voltage feed-forward feature improve performance in the TPS5450MDDAREP?

The voltage feed-forward feature in the TPS5450MDDAREP scales the internal PWM ramp voltage inversely with input voltage, maintaining constant power-stage gain across the 5.5–36 V input range. This results in faster line transient response - typically under 50 µs for a 2-A step - and simplified stability analysis, as loop gain becomes largely independent of VIN. The feed-forward gain is fixed at 25 and requires no configuration.

What thermal management is required for the TPS5450MDDAREP to deliver 5-A continuous current?

To sustain 5-A continuous output, the TPS5450MDDAREP requires its exposed PowerPAD™ (Pin 9) to be soldered to a PCB ground plane with ≥4 thermal vias connecting to internal ground layers. On a 4-layer board meeting TI's test conditions (2 oz copper, 2×2-inch size), this achieves 30°C/W junction-to-ambient thermal impedance. Without proper thermal pad connection, junction temperature will exceed 125°C under full load, triggering thermal shutdown.

Is the TPS5450MDDAREP pin-compatible with other members of the SWIFT™ family?

The TPS5450MDDAREP shares the same 8-pin SOIC PowerPAD™ (DDA) package and pinout with TPS5430DDAR and TPS5420DDAR, but functional differences exist: TPS5430DDAR is rated for 3 A and commercial temperature only, while TPS5420DDAR is 2 A. Though physically interchangeable, substituting them changes current capability, thermal limits, and qualification grade - TPS5450MDDAREP remains the only EP-grade, 5-A variant in this footprint.