The SPX3940M3-5.0 is a 1A Low Dropout (LDO) regulator manufactured by Sipex Corporation (now part of Exar Corporation). It is designed to provide a stable and regulated 5.0V output voltage from a higher input voltage with minimal voltage drop. This LDO regulator is commonly used in battery-powered devices and other applications where efficiency and low voltage operation are critical.

Applications

• Battery-powered devices
• Post-regulation for switching power supplies
• Motherboard applications
• Peripheral cards
• Microprocessor power supplies

Features

• 1A output current capability
• Low dropout voltage (typically 300mV at 1A)
• Fixed 5.0V output voltage
• Overcurrent and overtemperature protection
• Short-circuit protection
• Reverse battery protection
• Available in SOT-223 package
• Stable with low ESR ceramic output capacitors

Benefits

• Provides a stable and regulated 5.0V output voltage, ensuring reliable operation of connected devices.
• Low dropout voltage improves efficiency, especially in battery-powered applications.
• Integrated protection features prevent damage to the regulator and connected circuitry.
• Small SOT-223 package saves board space.
• Stable operation with ceramic output capacitors simplifies design and reduces component count.

Additional Details

The SPX3940M3-5.0 operates with an input voltage range of typically 2.5V to 16V. It features internal current limiting and thermal shutdown to protect the device from overloads and excessive temperatures. The low dropout voltage characteristic allows the regulator to maintain a stable output voltage even when the input voltage approaches the output voltage. It is ideal for applications where a regulated 5V supply is needed from a battery source or an unregulated DC input.