Texas Instruments TPS75315QPWP

Overview

TPS75315QPWP from Texas Instruments is a 1.5-A, 1.5-V fixed-output low-dropout (LDO) voltage regulator with integrated open-drain RESET output and thermal shutdown protection. It delivers 1.5 A at 160 mV typical dropout (at 1.5 A), operates from 2.7 V to 5.5 V input, maintains ±2% output tolerance over line/load/temperature, and is housed in a thermally enhanced 20-pin TSSOP PowerPAD™ (PWP) package. It serves as a primary power rail for DSP/FPGA core supplies requiring fast transient response and precise undervoltage monitoring.

For engineers reviewing the TPS75315QPWP datasheet, TPS75315QPWP pinout, TPS75315QPWP application, or TPS75315QPWP equivalent, key selection criteria include its 100-ms RESET timeout delay, 95% VOUT trip threshold, 75-μA quiescent current at full load, and compatibility with 47-μF minimum output capacitance using tantalum or ceramic capacitors.

Technical Context

The TPS75315QPWP uses a PMOS pass element enabling ultra-low dropout (160 mV at 1.5 A) and load-independent quiescent current (75 μA typ). Its internal comparator continuously monitors VOUT against a 1.1834-V reference to assert RESET when output falls below 95% of nominal (1.425 V), with 0.5% hysteresis and 100-ms delay on power-up.

It integrates thermal shutdown (trip at +150°C) and current limiting (~3.3 A), supports enable-controlled sleep mode (<1 μA standby), and requires no minimum load. The SENSE pin (Pin 7) connects directly to VOUT for precision regulation, and all GND/HEATSINK pins (1, 10, 11, 20) must be soldered to PCB thermal pad for rated power dissipation.

Key Specifications

Pinout & Package

TPS75315QPWP is packaged in a 20-pin Thermally Enhanced TSSOP (PWP) with exposed thermal pad (PowerPAD™), requiring soldering of pins 1, 10, 11, and 20 to PCB ground plane for thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS75315QDR and TLV75515PDQNR, the TPS75315QPWP uniquely combines 1.5-A capability, 160-mV dropout, integrated RESET, and PowerPAD™ thermal performance in a surface-mount TSSOP - making it the sole option for high-density, high-reliability 1.5-V core regulation with system-level reset coordination.

Availability

TPS75315QPWP is available at Aetrix Electronics and suitable for telecom infrastructure, DSP/FPGA power delivery, and industrial PLC CPU modules requiring stable component supply, long-term lifecycle support, and guaranteed thermal performance in compact designs.

Supply support for TPS75315QPWP 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 designing analog ICs, embedded processors, and connectivity solutions for industrial, automotive, and communications markets.

The TPS753xxQ family was engineered specifically for high-current, low-noise, RESET-integrated power management in DSP, FPGA, and microprocessor systems - prioritizing fast transient response, thermal robustness, and precise undervoltage detection.

FAQ

What is the RESET timeout delay specification for the TPS75315QPWP?

The TPS75315QPWP features a fixed 100-ms RESET timeout delay. After power-up, the RESET pin remains asserted (logic low) until the output voltage reaches 95% of its nominal value (1.425 V) and sustains that level for 100 ms, at which point RESET transitions to high-impedance. This delay ensures reliable processor initialization and avoids spurious resets during supply ramp-up. The TPS75315QPWP implements this timing internally with no external components required.

Does the TPS75315QPWP require an external resistor divider to set its output voltage?

No, the TPS75315QPWP is a fixed-output device delivering 1.5 V without external components. Its FB/SENSE pin (Pin 7) must be connected directly to the OUTPUT pins (8,9) for closed-loop regulation - no resistors are needed or used. The adjustable variant (TPS75301QPWP) requires an external R1/R2 divider, but the TPS75315QPWP is factory-trimmed and fully functional with only input/output capacitors and enable control.

What is the minimum output capacitance required for stable operation of the TPS75315QPWP?

The TPS75315QPWP requires a minimum 47-μF output capacitor with ESR between 100 mΩ and 10 Ω. Solid tantalum, aluminum electrolytic, or multilayer ceramic capacitors meeting these specifications ensure loop stability and adequate transient response. Using less than 47 μF or outside the ESR range risks oscillation or excessive output droop during load steps. The TPS75315QPWP datasheet validates stability with a 47-μF tantalum capacitor and specifies ESR boundaries in Figure 20.

How does the thermal design of the TPS75315QPWP differ from standard TSSOP packages?

The TPS75315QPWP uses a thermally enhanced TSSOP-20 PowerPAD™ (PWP) package with an exposed die attach pad (pins 1, 10, 11, 20). Unlike standard TSSOP, this pad must be soldered to a large PCB copper area to conduct heat away from the die. With 300 CFM airflow, the TPS75315QPWP achieves 2.2 W dissipation at +85°C ambient - more than double that of non-PowerPAD alternatives. Failure to connect the thermal pad degrades thermal performance and risks premature thermal shutdown.

Can the TPS75315QPWP be used in battery-powered applications?

Yes, the TPS75315QPWP is well-suited for battery-powered applications due to its 75-μA typical quiescent current at full load and <1-μA shutdown current when EN is high. Its 160-mV dropout enables efficient operation from single-cell Li-ion (3.0–4.2 V) or two-cell alkaline (2.4–3.2 V) sources to deliver regulated 1.5 V. The integrated RESET also provides battery-undervoltage detection, asserting when VOUT drops below 1.425 V - a critical feature for graceful system shutdown before deep discharge.