About this part

TPS73633DCQR – 3.3V 400mA Low-Dropout (LDO) Voltage Regulator – Texas Instruments

Optimize your power management with the Texas Instruments TPS73633DCQR LDO voltage regulator, engineered for efficiency-critical applications. This high-performance regulator delivers a stable 3.3V output at 400mA with ultra-low dropout voltage and minimal quiescent current, ensuring reliable operation in space-constrained designs. PCX supplies this active-component solution with guaranteed authenticity and rapid shipping.

Key Features

• Fixed 3.3V Output with ±2% accuracy
• 400mA Continuous Output Current for robust power delivery
• Ultra-Low 200mV Dropout @ 400mA (max) for high efficiency
• 58dB PSRR at 100Hz for superior noise rejection
• Enable Pin Control for power sequencing
• 550µA Quiescent Current extends battery life
• Integrated Protections: Over-current, thermal shutdown, reverse polarity
• -40°C to +125°C Operating Range for harsh environments

Technical Details

This single-channel NMOS LDO regulator accepts input voltages up to 5.5V and maintains stable 3.3V output without external capacitors. The SOT-223-6 surface-mount package features a thermal pad for effective heat dissipation. With 1mA maximum supply current and optimized transient response, it excels in noise-sensitive circuits. Full specifications available in the datasheet.

Typical Applications

• Portable and battery-powered IoT devices
• Post-regulation for switching power supplies
• Noise-sensitive sensor interfaces and RF modules
• Embedded systems and microcontroller power rails
• Industrial control systems and automation

About Texas Instruments

Texas Instruments (TI) is a global semiconductor leader with over 90 years of innovation in analog and embedded processing technologies. Renowned for rigorous quality standards, TI’s power management ICs set industry benchmarks for efficiency, reliability, and thermal performance across automotive, industrial, and consumer markets.

TI’s commitment to advanced manufacturing processes ensures consistent product longevity and environmental compliance. Their extensive technical resources and application expertise make TI components preferred solutions for mission-critical designs worldwide.

About LDO Voltage Regulators

Low-dropout (LDO) regulators provide precise voltage regulation with minimal input-output differential, making them ideal for battery-operated systems and noise-sensitive circuits. Unlike switching regulators, LDOs deliver ripple-free output without electromagnetic interference (EMI), simplifying system design while maintaining high power-supply rejection ratios (PSRR).

Modern LDOs like the TPS73633 series integrate advanced protections and enable controls, replacing multiple discrete components. Their compact footprint and capacitor-free operation reduce board space and BOM costs in space-constrained applications from wearables to industrial controllers.

Packaging Options

Available in industry-standard Tape & Reel (TR), Cut Tape (CT), and Digi-Reel® formats for automated assembly. Contact PCX for reel quantities and custom packaging requests.

FAQs

Q: Does this LDO require external capacitors?
A: No – the TPS73633DCQR is stable without external capacitors, simplifying board design.

Q: What’s the typical startup time for this regulator?
A: Approximately 50µs when enabled, ensuring rapid power-up sequencing.

Q: Can it withstand reverse voltage connections?
A: Yes – built-in reverse polarity protection safeguards against -1V reverse voltage.

Q: Is this suitable for automotive applications?
A: While industrial-grade (-40°C to +125°C), verify against specific automotive standards for your use case.

Q: How does PSRR performance affect my design?
A: 58dB PSRR at 100Hz significantly reduces input noise, critical for analog/RF circuits.

Q: What’s the difference between NMOS and PMOS LDOs?
A: NMOS LDOs like this TI device offer lower dropout voltage and better transient response than PMOS equivalents.

Product images are representational. Refer to datasheet for exact dimensions.

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