The LP3984ITP-1.8 is a low-dropout (LDO) linear regulator from Texas Instruments (formerly National Semiconductor). It's designed to provide a stable and accurate 1.8V output voltage from a higher input voltage. This regulator is known for its low quiescent current and small size, making it suitable for battery-powered and portable applications where efficiency and space are critical.

Applications:

• Mobile phones and smartphones: Powering core logic and peripheral devices.
• PDAs (Personal Digital Assistants): Providing regulated voltage for processors and memory.
• MP3 players and portable media devices: Ensuring stable power for audio and video processing.
• Wireless devices: Regulating voltage for RF transceivers and microcontrollers.
• Battery-powered equipment: Offering efficient voltage regulation in devices with limited power resources.

Features:

• Low dropout voltage: Operates with a small difference between input and output voltage, maximizing battery life.
• Stable with ceramic capacitors: Ensures stable operation with low-ESR ceramic capacitors, reducing component count and cost.
• Low quiescent current: Minimizes power consumption when the regulator is not actively supplying current.
• Over-current protection: Protects the regulator and the load from damage in case of a short circuit or overload.
• Thermal shutdown protection: Prevents the regulator from overheating and failing due to excessive power dissipation.
• Fixed output voltage: Provides a precise and stable 1.8V output voltage.
• Enable pin: Allows the regulator to be turned on and off, further reducing power consumption.

Benefits:

• Extended battery life: Low quiescent current and low dropout voltage contribute to longer battery life in portable devices.
• Improved system reliability: Over-current and thermal shutdown protection prevent damage to the regulator and the load.
• Smaller and more compact designs: Small size and ceramic capacitor stability enable smaller and more compact designs.
• Simplified design: Fixed output voltage simplifies the design process and reduces the need for external components.
• Lower cost: Ceramic capacitor stability reduces component count and cost.

Technical Specifications:

The LP3984ITP-1.8 typically features an input voltage range of 2.5V to 5.5V. It provides a fixed output voltage of 1.8V with an output current capability of up to 150mA. The dropout voltage is typically around 150mV at 150mA. The quiescent current is typically 15μA. It is available in a Thin SOT-23 package.