TPS76333DBVR – Texas Instruments 150mA Low-Dropout Fixed 3.3V Linear Voltage Regulator

Product Overview

The TPS76333DBVR is a low-power low-dropout (LDO) linear voltage regulator manufactured by Texas Instruments (TI). It belongs to the TPS763 family, designed for applications requiring low quiescent current, stable 3.3V power supply, compact packaging, and efficient battery-powered operation.

The device provides a fixed 3.3V output voltage with up to 150mA output current capability, operating from an input voltage range of 2.7V to 10V. It integrates enable control, over-current protection, thermal shutdown, and reverse-polarity protection, making it suitable for powering microcontrollers, sensors, communication modules, and low-power embedded systems. 

The TPS76333DBVR is supplied in a compact 5-pin SOT-23 (DBV) surface-mount package, making it suitable for space-constrained PCB designs.

Applications

Microcontroller Power Supplies

• STM32 MCU systems
• PIC microcontroller boards
• Embedded controllers
• Development platforms

Advantages:

• Stable 3.3V rail
• Low standby consumption
• Small PCB footprint

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IoT and Sensor Devices

• Wireless sensor nodes
• Environmental monitoring systems
• Smart home devices
• Battery-powered IoT products

Advantages:

• Low quiescent current
• Enable-controlled power management
• Low noise output

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Communication Modules

• Bluetooth modules
• Wi-Fi modules
• RF transceiver circuits
• GPS modules

Advantages:

• Good PSRR performance
• Stable low-voltage supply
• Compact implementation

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Portable Electronics

• Handheld devices
• Wearable electronics
• Battery-powered instruments
• Medical portable devices

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Industrial Embedded Systems

• Control boards
• Data acquisition modules
• Automation equipment
• Measurement systems

Key Features

1. Fixed 3.3V Output Voltage

The TPS76333DBVR provides a regulated 3.3V output, one of the most commonly used voltage rails in embedded electronics.

Benefits:

• Directly powers 3.3V MCUs and sensors
• Eliminates external feedback resistors
• Simplifies power-tree design
• Provides stable voltage for sensitive digital circuits

Typical loads:

• STM32 microcontrollers
• EEPROM devices
• Wireless modules
• Sensor ICs
• Low-power processors

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2. 150mA Output Current Capability

The device supports up to 150mA continuous output current.

Benefits:

• Suitable for low-power embedded systems
• Powers multiple small ICs from a single rail
• Reduces PCB complexity
• Ideal for battery-operated products

Typical applications:

• IoT nodes
• Sensor modules
• Portable electronics
• Communication interfaces

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3. Low Quiescent Current

The TPS763 family is optimized for low-power operation, with approximately 100µA typical quiescent current.

Benefits:

• Extends battery life
• Reduces standby power consumption
• Suitable for always-on systems
• Improves energy efficiency in portable products

Applications include:

• Wireless sensors
• Battery monitors
• Smart meters
• Wearable devices

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4. Low Dropout Voltage Operation

The device achieves approximately:

0.5V maximum dropout voltage at 150mA load.

Benefits:

• Maintains regulation with small input/output voltage difference
• Improves battery utilization
• Suitable for low-voltage power sources
• Provides better efficiency than traditional linear regulators

Example:

A 3.8V lithium battery can supply a stable 3.3V rail for low-power electronics.

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5. Enable Control Function

The TPS76333DBVR includes an enable pin for power control. Texas Instruments

Benefits:

• Allows MCU-controlled power switching
• Reduces system standby power
• Supports power sequencing
• Enables intelligent power management designs

Typical uses:

• Sleep/wake systems
• Battery-powered devices
• Multi-rail embedded systems

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6. High Power Supply Rejection Ratio (PSRR)

The device provides approximately 60dB PSRR at 1kHz.

Benefits:

• Filters input voltage noise
• Improves analog circuit stability
• Suitable for sensor and communication applications
• Reduces interference from switching power supplies

Applications:

• ADC reference supplies
• RF modules
• Precision sensors

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7. Integrated Protection Functions

The TPS76333DBVR includes:

• Over-current protection
• Thermal shutdown
• Reverse polarity protection

Benefits:

• Protects regulator and downstream circuits
• Improves product reliability
• Reduces external protection components
• Suitable for industrial embedded products

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8. Compact SOT-23-5 Package

The device uses a 5-pin SOT-23 package.

Benefits:

• Saves PCB space
• Suitable for compact electronic products
• Compatible with automated SMT assembly
• Reduces overall system size

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9. Wide Industrial Temperature Range

The TPS76333DBVR supports:

-40°C to +125°C operating temperature.

Benefits:

• Suitable for industrial environments
• Supports long-life embedded products
• Improves reliability under temperature variation
• Fits automation and control applications

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Applications

Battery-Powered Electronics

• Portable instruments
• Wearable devices
• Handheld equipment
• Battery monitoring systems

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Embedded Microcontroller Systems

• STM32-based systems
• AVR/PIC controllers
• Sensor controllers
• Embedded control boards

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IoT Devices

• Wireless sensor nodes
• Smart home devices
• Environmental monitoring systems
• Low-power gateways

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Communication Modules

• Bluetooth modules
• Zigbee modules
• RF transceiver circuits
• GPS/GNSS modules

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Consumer Electronics

• Portable audio devices
• Remote controls
• Small display systems
• Smart accessories

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Industrial Sensors

• Data acquisition modules
• Measurement devices
• Automation sensors
• Monitoring equipment