The LP2980IM5X-1.8 is a 50 mA, fixed-output, low-dropout (LDO) regulator from Texas Instruments (formerly National Semiconductor). It is designed for use in battery-powered systems and other applications where low noise and low power consumption are critical. This regulator offers excellent performance, including a low dropout voltage and high accuracy, making it suitable for sensitive analog circuits and portable devices.

Applications:

• Cellular phones
• Cordless phones
• PDAs
• Palmtop computers
• Digital cameras and camcorders
• MP3 players and other portable audio devices
• Wireless LAN devices
• Bluetooth devices
• Microcontroller power supplies

Features:

• Fixed output voltage: 1.8V
• Low dropout voltage: Typically 85 mV at 50 mA
• Low quiescent current: Typically 375 μA
• High output accuracy: ±0.5% (typical)
• Stable with ceramic output capacitors
• Overcurrent and overtemperature protection
• Available in SOT-23-5 package

Benefits:

• Extends battery life in portable applications due to low quiescent current.
• Provides a stable and accurate output voltage for sensitive circuits.
• Reduces noise and ripple in the power supply.
• Protects the regulator from damage due to overcurrent or overtemperature conditions.
• Small SOT-23-5 package saves board space.
• Easy to use, requiring few external components.

Additional Details:

The LP2980IM5X-1.8 features internal current limiting and thermal shutdown protection to safeguard the device and the powered circuitry. It is designed to be stable with ceramic output capacitors, which are smaller and have lower ESR than tantalum or electrolytic capacitors. This allows for a more compact and efficient power supply design. The device is specified for operation over a temperature range of -40°C to +125°C.

The low dropout voltage allows the LP2980IM5X-1.8 to operate with a smaller difference between the input and output voltages, maximizing efficiency and extending battery life, particularly as the battery voltage decreases. The tight output voltage tolerance ensures consistent performance of the powered circuitry. The small SOT-23-5 package makes it suitable for space-constrained applications.