Texas Instruments TPS76333QDBVRG4Q1

Summary of Texas Instruments TPS76333-Q1 Product

The Texas Instruments TPS76333-Q1 represents a significant advancement in the realm of linear voltage regulators, engineered specifically for automotive and battery-powered applications requiring a robust 3.3V fixed output at up to 150mA. Distinguished by its low dropout voltage and low quiescent current, the TPS76333-Q1 belongs to the highly regarded TPS763xx-Q1 family of low-dropout (LDO) regulators. Packaged in a compact SOT-23-5 (DBV) form factor, this device is particularly well-suited for designs where board space is limited and high reliability is essential.

Main Attributes and Electrical Parameters of TPS76333-Q1

The TPS76333-Q1 is qualified for AEC-Q100 Grade 1, guaranteeing reliable operation across a wide ambient temperature range of –40°C to +125°C—a primary requirement for demanding automotive environments. The regulator supports an input voltage range from 2.7V to 10V and provides a precisely regulated 3.3V output. At its rated load of 150mA, the maximum dropout voltage remains as low as 375mV, with typical values near 300mV. The device's quiescent current is capped at 140μA, enabling extended battery life in portable systems.

For noise-sensitive applications, the TPS76333-Q1 delivers strong performance with an output noise of 140μVRMS (300Hz to 50kHz) and a power supply rejection ratio (PSRR) of 60dB at 1kHz. Integrated protection features include overcurrent protection, thermal shutdown, and reverse polarity protection, ensuring device and system safety under fault conditions. In standby mode, the quiescent current is reduced to a typical 0.5μA, making the device highly efficient in low-power states.

TPS76333-Q1 Pin Layout and Functional Overview

The SOT-23-5 package of the TPS76333-Q1 offers a straightforward pinout, optimized for ease of layout and use in dense PCBs. Pin assignments are as follows:

IN – Input supply voltage

GND – Ground

EN – Enable input (an active-high logic input allows for regulator shutdown)

NC – No connection (fixed-voltage versions only)

OUT – Regulated output voltage

A logic-controlled enable feature allows system-level shutdown for power-saving modes, a critical consideration for automotive ECUs and battery-operated products.

Operational Performance Parameters of TPS76333-Q1

Characterized over its full specified temperature range, the TPS76333-Q1 exhibits tight output voltage regulation, with typical deviations under 1%. Short-term load and line responses are also well-controlled, resulting in high system stability during transient events.

The internal PMOS pass element design offers advantages over traditional NPN pass elements, as it eliminates the need for high base drive currents and reduces dropout voltage. This topology ensures that the quiescent current remains nearly independent of the output load—a key metric for battery-powered designs.

Load transient response is fast and well-damped, minimizing output deviations in scenarios where digital subsystems or RF blocks rapidly switch operating states.

Typical Use Cases for TPS76333-Q1

The TPS76333-Q1 is intended for a broad spectrum of automotive and portable electronics:

RF systems such as voltage-controlled oscillators (VCOs) and ADCs, where low-noise and stable voltage rails are non-negotiable.

Cellular phones and Bluetooth® modules, leveraging the shutdown feature to maximize idle battery lifetime.

General battery-powered equipment, including automotive ECUs and portable measurement instruments.

Its robust protection features make the device particularly suitable for harsh operating environments typical in under-hood electronic control applications.

Design Guidelines and Power Supply Advice for TPS76333-Q1

To maximize performance, the recommended input voltage is at least 1V above the expected output voltage, with 4.7μF or greater low-ESR ceramic capacitors at both input and output for stability across load and temperature variations.

Careful PCB layout is crucial. Components should be placed as close as possible to the regulator pins to minimize parasitic inductance and improve transient response. Since the device's thermal resistance (RθJA) is 205.2°C/W, designers should consider adequate copper area for heat dissipation, especially in high-ambient or high-current applications.

The logic-controlled ENABLE pin allows power domains to be sequenced or dynamically powered down, which is invaluable in multi-rail modern automotive and portable design architectures.

Thermal Characteristics and Mechanical Details of TPS76333-Q1

The TPS76333-Q1’s SOT-23-5 package measures 2.90mm x 1.60mm, fitting the narrowest of PCB footprints. The thermal performance metrics ensure reliability—with top case and board thermal resistances of 11.83°C/W and 34.8°C/W, respectively. During full load operation at high ambient temperatures, thermal protection circuitry prevents device and system overheating, further extending long-term system reliability.

Alternative or Substitute Models for TPS76333-Q1

Engineers seeking alternative fixed-voltage, low-dropout regulators within the same family or for variant output voltages can consider other members of the TPS763xx-Q1 series:

TPS76301-Q1 (variable output, 1.5V to 6.5V)

TPS76316-Q1 (1.6V fixed output)

TPS76318-Q1 (1.8V fixed output)

TPS76325-Q1 (2.5V fixed output)

TPS76330-Q1 (3.0V fixed output)

TPS76350-Q1 (5.0V fixed output)

Each offers the same package, protection mechanisms, and electrical characteristics, ensuring seamless drop-in replacement and minimizing qualification effort. For output current or feature expansion, designers may consider other LDO regulators from Texas Instruments’ automotive-qualified portfolio.

Conclusion

The Texas Instruments TPS76333-Q1 stands out as an automotive-grade, low-dropout linear regulator combining low quiescent current, strong transient response, and robust protections in a miniature SOT-23-5 package. Its feature set targets the needs of automotive modules and portable electronics, providing procurement and design engineers with a reliable solution for 3.3V, 150mA power rails. Furthermore, the available family variants simplify adaptation to different output voltages without altering board design, making the TPS76333-Q1 a strong candidate for space- and efficiency-conscious modern electronics.