Texas Instruments TPS73HD301PWP

Overview

TPS73HD301PWP from Texas Instruments is a dual-output LDO voltage regulator with fixed 3.3-V output on Regulator #2 and adjustable output (1.2–9.75 V) on Regulator #1, supporting up to 750 mA per channel, <80 mV dropout at 100 mA, 340 µA typical quiescent current per regulator, and dual active-low reset signals with 200-ms pulse width-designed for split-supply DSP power systems.

For engineers reviewing the TPS73HD301PWP datasheet, TPS73HD301PWP pinout, TPS73HD301PWP application, or TPS73HD301PWP equivalent, key selection criteria include dual independent enable/reset control, remote sense capability on both outputs, thermal performance in PowerPAD TSSOP-28, and operation across −40°C to 125°C for industrial DSP and mixed-voltage embedded applications.

Technical Context

The TPS73HD301PWP integrates two independent low-dropout regulators sharing a common 28-pin PowerPAD TSSOP package but with separate input, ground, enable, sense/feedback, and reset terminals-enabling flexible split-rail configuration. Regulator #1 uses external resistor divider feedback (1FB/SENSE) for programmable output; Regulator #2 delivers fixed 3.3 V with dedicated 2SENSE for remote sensing.

Each regulator features ultra-low quiescent current (340 µA typ), sleep-mode supply current ≤2 µA, and thermal shutdown at 165°C. The dual reset outputs (1RESET, 2RESET) are independently monitored with trip thresholds of 2.868 V (3.3-V rail) and hysteresis of 18 mV, ensuring reliable power sequencing in multi-rail DSP systems.

Key Specifications

Pinout & Package

TPS73HD301PWP is housed in a 28-pin PowerPAD™ TSSOP package with exposed thermal pad (PWP), requiring soldering to PCB copper for optimal thermal dissipation. The package supports up to 4.3 W power dissipation with 300 CFM airflow when mounted per TI SLMA002 guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS7H3301-SP and TPS7A8300RGWR, the TPS73HD301PWP offers unique dual-rail integration with independent enable/reset and remote sense in one 28-pin package-making it optimal for cost-sensitive, space-constrained DSP and industrial control designs where radiation hardening or sub-10-µV noise are not required.

Availability

TPS73HD301PWP is available at Aetrix Electronics and suitable for DSP power management, industrial PLCs, battery-powered test equipment, and automotive ADAS sensor hubs requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TPS73HD301PWP 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 expertise in high-reliability power solutions.

The TPS73HD3xx product line was designed specifically for DSP and mixed-signal applications demanding dual, independently controllable, low-dropout voltage rails with precision sequencing and sensing-targeting telecom infrastructure, industrial automation, and portable instrumentation markets.

FAQ

What output voltages does the TPS73HD301PWP provide?

The TPS73HD301PWP provides two independent outputs: Regulator #2 delivers a fixed 3.3 V, while Regulator #1 is adjustable from 1.2 V to 9.75 V using external resistors connected to the 1FB/SENSE pin. This configuration supports split-rail DSP architectures requiring different core and I/O voltages. The 3.3-V output is specified at ±2.2% over temperature and load, and the adjustable rail's reference voltage is 1.182 V with 75 ppm/°C drift.

How does the TPS73HD301PWP handle power sequencing between its two regulators?

The TPS73HD301PWP supports precise power sequencing via independent active-low enable inputs (1EN and 2EN). Each regulator can be enabled separately-e.g., assert 1EN first to power the DSP core, then delay and assert 2EN for the 3.3-V I/O rail. This eliminates need for external timers or supervisors. The TPS73HD301PWP datasheet confirms no internal dependency between enables, allowing fully asynchronous control.

What is the minimum input voltage required for the TPS73HD301PWP's 3.3-V regulator to operate within specification?

For the 3.3-V regulator (Regulator #2), the minimum input voltage is 3.97 V under recommended operating conditions-calculated as VO(max) + VDO(max) = 3.37 V + 0.6 V = 3.97 V at 750 mA. At lighter loads (e.g., 100 mA), dropout drops to ≤100 mV, allowing operation down to ~3.4 V. The absolute lower limit is 3.5 V per datasheet Note 2; below that, regulation and load capability are not guaranteed.

Can the TPS73HD301PWP's reset outputs be used to monitor both rails simultaneously?

Yes-the TPS73HD301PWP provides two independent active-low reset outputs: 1RESET monitors Regulator #1 (adjustable rail) and asserts when its output falls below 1.145 V (trip threshold), while 2RESET monitors Regulator #2 (3.3-V rail) and asserts below 2.868 V. Both have 200-ms nominal timeout delay and 18-mV hysteresis, enabling independent fault detection and safe system reset without cross-coupling.

What thermal design considerations apply to the TPS73HD301PWP's PowerPAD TSSOP package?

The TPS73HD301PWP's PWP package requires soldering the exposed thermal pad to a minimum 2-in × 2-in copper pour on a 1-layer PCB (or larger multilayer plane) to achieve rated power dissipation. With 0 CFM airflow, thermal resistance is 42.6°C/W; with 300 CFM, it drops to 17.3°C/W. TI's SLMA002 technical brief specifies exact copper patterns-failure to follow these reduces safe operating area and may trigger thermal shutdown above 165°C junction temperature.