The SPX1129M3-3.3/TR is a low dropout (LDO) linear regulator manufactured by Sipex Corporation (now part of Exar Corporation). It is designed to provide a stable 3.3V output voltage from a higher input voltage with minimal voltage drop. This regulator is commonly used in applications where a clean and regulated voltage is required, such as in battery-powered devices, microcontrollers, and other sensitive electronic circuits.

Applications:

• Battery-powered devices
• Microcontroller power supplies
• Portable electronics
• Post-regulation for switching power supplies
• Noise-sensitive circuits

Features:

• Low dropout voltage
• Fixed 3.3V output voltage
• High output current capability
• Overcurrent and overtemperature protection
• Low quiescent current
• Stable with ceramic capacitors

Benefits:

• Stable Output Voltage: Provides a clean and regulated 3.3V output voltage, ensuring consistent performance of connected devices.
• Extended Battery Life: Low quiescent current minimizes power consumption, extending battery life in portable devices.
• Reliable Operation: Built-in protection features prevent damage from overcurrent and overtemperature conditions.
• Simplified Design: Easy to use with minimal external components required.
• Improved Noise Performance: Low dropout voltage and stable output contribute to reduced noise and improved performance in sensitive circuits.

Technical Specifications:

The SPX1129M3-3.3/TR typically operates with an input voltage range of 2.5V to 16V. It provides a fixed 3.3V output voltage with a typical accuracy of ±2%. The output current capability is usually around 300mA. The dropout voltage is typically less than 300mV at the rated output current. The quiescent current is typically a few microamperes. The regulator is stable with ceramic capacitors, eliminating the need for bulky electrolytic capacitors. It is available in a small surface-mount package such as an SOT-223.