Texas Instruments TPS76733QPWPRQ1

Overview

TPS76733QPWPRQ1 from Texas Instruments is an automotive-qualified 3.3-V, 1-A low-dropout (LDO) voltage regulator with PMOS pass element, 350-mV dropout at 1 A (25°C), 85-µA typical quiescent current, open-drain RESET output with 200-ms delay, and thermal shutdown protection - used to power microcontroller cores and I/O rails in engine control units and ADAS domain controllers.

For engineers reviewing the TPS76733QPWPRQ1 datasheet, TPS76733QPWPRQ1 pinout, TPS76733QPWPRQ1 application, or TPS76733QPWPRQ1 equivalent, key selection criteria include dropout performance under 1-A load across −40°C to 125°C, RESET threshold hysteresis (92–98% VO), GND/HSINK thermal pad layout requirements, and compatibility with 10-µF low-ESR output capacitors.

Technical Context

The TPS76733QPWPRQ1 employs a PMOS pass transistor enabling ultra-low, load-proportional dropout voltage and quiescent current independent of output loading - critical for battery-backed systems. Its internal 1.1834-V reference feeds a precision error amplifier that maintains ±2% output tolerance over line, load, and temperature.

It integrates an undervoltage-monitoring comparator driving an open-drain RESET output with fixed 200-ms timeout, plus thermal shutdown (150°C trip) and current limiting (~1.7 A). The device operates stably with 10-µF output capacitance (ESR 50 mΩ–1.5 Ω) and requires no minimum load.

Key Specifications

Pinout & Package

TPS76733QPWPRQ1 uses a 20-pin HTSSOP (PWP) package with integrated PowerPAD™ thermal pad connected to GND/HSINK terminals for enhanced heat transfer to PCB copper.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TPS76733QPWPRQ1, TPS76733QPWPR lacks automotive qualification and long-term reliability validation, while TPS7433QPWPRQ1 trades output current and thermal capability for lower IQ - making the original part optimal for 1-A, high-temperature automotive power rails.

Availability

TPS76733QPWPRQ1 is available at Aetrix Electronics and suitable for engine control units, ADAS camera modules, and body control modules requiring stable component supply with full AEC-Q100 traceability and PPAP documentation support.

Supply support for TPS76733QPWPRQ1 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 automotive electronics, with decades of experience in high-reliability power management solutions.

The TPS767xx family was designed specifically for automotive power rails demanding low dropout, low IQ, integrated RESET, and robust thermal performance - targeting ECU, ADAS, and infotainment subsystems.

FAQ

What is the minimum input voltage required for stable operation of the TPS76733QPWPRQ1?

The minimum input voltage for the TPS76733QPWPRQ1 is 4.3 V - calculated as VO(typ) + 1 V (3.3 V + 1 V) per datasheet Section "Recommended Operating Conditions." This ensures sufficient headroom for the 350-mV dropout at 1 A and maintains regulation across temperature and load. Below 4.3 V, the device enters dropout and output voltage declines linearly with input.

Does the TPS76733QPWPRQ1 require an external pullup resistor on the RESET pin?

Yes, the TPS76733QPWPRQ1 RESET pin is open-drain and requires an external pullup resistor to a valid logic-high voltage (e.g., 3.3 V or 5 V). Typical values range from 10 kΩ to 100 kΩ. Without pullup, RESET remains undefined and cannot drive downstream reset circuitry - a mandatory design requirement confirmed in Figure 26 and Section "Terminal Functions."

Can the TPS76733QPWPRQ1 operate without an output capacitor?

No, the TPS76733QPWPRQ1 requires a minimum 10-µF output capacitor with ESR between 50 mΩ and 1.5 Ω for loop stability, as explicitly stated in the "External Capacitor Requirements" section. Omitting Co causes oscillation and regulation failure - solid tantalum, aluminum electrolytic, or multilayer ceramic capacitors meeting these specs are acceptable.

What is the function of the GND/HSINK pins on the TPS76733QPWPRQ1 package?

The GND/HSINK pins (1, 2, 9, 10, 11, 12, 19, 20) serve dual roles: they provide low-impedance ground return paths and act as thermal interfaces to the PCB copper pour. Per TI technical brief SLMA002, proper soldering of these pins to ≥4 in² of 1-oz copper is required to achieve the rated 1.9-W power dissipation at 70°C ambient - critical for automotive thermal management.

Is the TPS76733QPWPRQ1 pin-compatible with other devices in the TPS767xx family?

Yes, all fixed-output TPS767xx variants (e.g., TPS76725QPWPRQ1, TPS76750QPWPRQ1) share identical 20-pin PWP packaging and pinout - including IN, OUT, GND/HSINK, EN, RESET, and NC assignments. This enables direct voltage-option substitution on the same PCB layout without redesign, provided input/output voltage margins and thermal constraints are verified.