The TPS78533QKVURQ1 from Texas Instruments is a low-dropout linear voltage regulator, commonly known as an LDO — Low Dropout Regulator, designed for applications requiring a stable regulated 3.3V supply with output current up to 1A.

This device belongs to the TPS785-Q1 family, developed for automotive applications and qualified according to AEC-Q100, providing high reliability in demanding environments. Its 1.7V to 6.0V input range makes it suitable for a wide range of low-voltage power architectures, including post-regulation after DC/DC converters, microcontroller power rails, logic circuits, sensors, RF modules and sensitive analog loads.

The TPS78533QKVURQ1 version features a fixed 3.3V output, TO-252-5 / DPAK SMD package and suitable power dissipation capability for moderate-power applications, provided the PCB thermal limits are correctly considered.

The regulator includes an Enable input, allowing the output to be turned on or off by logic control or power sequencing. It also features internal soft-start, active output discharge, current limiting, thermal protection and good power-supply ripple rejection, making it suitable for designs where stability and low noise are important.

Main features

• Linear LDO voltage regulator
• Brand: Texas Instruments
• Part number: TPS78533QKVURQ1
• Family: TPS785-Q1
• Output type: fixed
• Output voltage: 3.3V
• Maximum output current: 1A
• Input voltage range: 1.7V to 6.0V
• Maximum dropout voltage: 425mV at 1A for the TO-252/KVU version
• Output accuracy: 0.5% typical / 1.7% maximum
• Low quiescent current: 25µA typical
• PSRR: 60dB at 1kHz / 45dB at 100kHz / 30dB at 1MHz
• Enable control
• Internal soft-start to reduce inrush current
• Active output discharge
• Overcurrent protection
• Overtemperature protection
• Junction temperature range: -40°C to +150°C
• Qualification: AEC-Q100
• Grade: Automotive
• Mounting type: SMD / surface mount
• Package: TO-252-5 / DPAK
• TI package code: KVU
• Number of regulators: 1
• Output configuration: positive

Recommended applications

• 3.3V power supply rails
• DC/DC converter post-regulation
• Microcontroller power supplies
• Digital and logic circuits
• Sensors and electronic modules
• Automotive electronics
• Telematics and embedded electronics
• Instrumentation and measurement circuits
• Sensitive analog loads
• RF and telecommunication equipment
• Electronic projects requiring a stable 3.3V rail up to 1A

Application note

For best performance, the manufacturer’s recommendations for input and output capacitors, PCB layout, thermal dissipation and current limits should be followed. In higher-current applications, package and PCB power dissipation must be properly calculated.

Important note

This is an SMD electronic component. Installation requires suitable soldering tools and electronics knowledge. Always confirm pinout, package, input voltage, output current and thermal dissipation before using it in a circuit.