Texas Instruments TPS73HD325PWP

Overview

TPS73HD325PWP from Texas Instruments is a dual-output LDO voltage regulator with fixed 3.3-V and 2.5-V outputs, designed for split-supply DSP applications. It delivers up to 750 mA per regulator, features <800 mV dropout at 750 mA (2.5-V rail), 340 µA typical quiescent current per regulator, and dual active-low reset signals with 200-ms pulse width. It operates across −40°C to 125°C in a 28-pin PowerPAD™ TSSOP package.

For engineers reviewing the TPS73HD325PWP datasheet, TPS73HD325PWP pinout, TPS73HD325PWP application, or TPS73HD325PWP equivalent, key selection criteria include dual-rail output stability under load transients, thermal performance in compact PCB layouts, reset timing accuracy across temperature, and compatibility with remote sense feedback for point-of-load regulation.

Technical Context

The TPS73HD325PWP integrates two independent low-dropout linear regulators: Regulator #1 provides a fixed 3.3-V output with dropout as low as 44 mV at 100 mA; Regulator #2 delivers a fixed 2.5-V output with 800 mV max dropout at 750 mA. Each regulator includes dedicated enable (active-low), ground, input, output, and sense terminals, enabling independent power sequencing and remote voltage sensing.

It implements dual independent reset generators triggered by output voltage monitoring-each with trip thresholds of 2.868 V (3.3-V rail) and 2.172 V (2.5-V rail), 18-mV hysteresis, and guaranteed 100–300 ms timeout delay over temperature. The PowerPAD™ TSSOP package requires thermal pad soldering to PCB copper for rated power dissipation (up to 4.3 W at 300 CFM airflow).

Key Specifications

Pinout & Package

The TPS73HD325PWP uses a 28-pin PowerPAD™ TSSOP (PWP) package with an exposed thermal pad on the underside requiring solder connection to PCB copper for thermal management. Pin numbering follows standard top-view orientation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-output LDO regulator applications.

Compared with TPS73HD325PWP, TPS73HD318PWPR offers identical functionality for 1.8-V core systems with zero hardware change, while TPS7H3301-SP provides radiation tolerance at the expense of cost, availability, and pin compatibility - making it suitable only for mission-critical aerospace deployments.

Availability

TPS73HD325PWP is available at Aetrix Electronics and suitable for DSP power management, industrial PLC I/O modules, and automotive infotainment head units requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS73HD325PWP 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.

The TPS73HD3xx family was engineered specifically for high-reliability, multi-rail DSP power delivery - emphasizing low dropout, independent enable/reset, remote sensing, and thermal resilience in compact packages.

FAQ

What are the output voltage options supported by the TPS73HD325PWP?

The TPS73HD325PWP provides two fixed, non-adjustable output voltages: 3.3 V on Regulator #1 and 2.5 V on Regulator #2. These values are factory-trimmed and cannot be modified externally. The 3.3-V rail has a tolerance of ±2.5% over temperature and load, while the 2.5-V rail maintains ±2.5% across −40°C to 125°C. Neither output supports external feedback adjustment - the 1FB/SENSE pin is unused in this variant.

How does the TPS73HD325PWP handle thermal management in high-power applications?

The TPS73HD325PWP uses a PowerPAD™ TSSOP package with an exposed thermal pad that must be soldered to a minimum 4 in² copper area on a 1-layer PCB (or 6 in² on inner layers of multilayer boards) to achieve rated power dissipation. With proper layout, it delivers up to 4.3 W at 300 CFM airflow. Derating is 34.6 mW/°C above 25°C ambient - meaning at 70°C ambient, maximum safe power drops to 2.8 W. Thermal shutdown activates at 165°C junction temperature.

Can the TPS73HD325PWP's reset outputs drive microcontroller reset inputs directly?

Yes, both 1RESET and 2RESET are open-drain, active-low outputs capable of sinking ≥400 µA at 0.4 V (max) - sufficient to assert standard CMOS reset inputs with pull-up resistors. Each reset has 18-mV hysteresis and a nominal 200-ms timeout, with trip thresholds of 2.868 V (for 3.3-V rail) and 2.172 V (for 2.5-V rail). No external components are required for basic reset functionality, though RC filters may be added for additional noise immunity.

What is the minimum input voltage required for stable operation of the TPS73HD325PWP?

For Regulator #1 (3.3-V output), minimum input is 3.97 V (3.3 V + 670 mV worst-case dropout at 750 mA). For Regulator #2 (2.5-V output), minimum input is 4.3 V (2.5 V + 1.8 V headroom per datasheet note). Absolute minimum input for valid reset assertion is 1.9 V on either rail. Input voltage must remain within −0.3 V to 11 V to avoid absolute maximum rating violation. Below recommended minima, regulation degrades and reset may not assert correctly.

Does the TPS73HD325PWP support remote sensing on both output rails?

No - only Regulator #2 (2.5-V output) supports remote sensing via the 2SENSE pin. Regulator #1 (3.3-V output) has no dedicated sense input; its 1FB/SENSE pin is unused in the TPS73HD325PWP variant and should be left floating or tied to 1OUT. The 2SENSE pin must be connected directly to the load-side 2.5-V net to compensate for PCB trace voltage drop, ensuring regulation accuracy at the point of load rather than at the IC output pin.