The SPX1117-M1.8 is a low dropout (LDO) positive voltage regulator manufactured by Exar Corporation. It's designed to provide a stable and regulated 1.8V output from a higher input voltage, making it suitable for various applications where a reliable power supply is needed. This regulator is known for its low dropout voltage and thermal shutdown protection.

Applications

• Post Regulation for Switching Power Supplies: Cleans up and stabilizes voltage after a switching power supply stage.
• High-Efficiency Linear Regulators: Used where high efficiency is required, such as battery-powered applications.
• Battery Chargers: Can be part of a battery charging circuit to provide a regulated voltage for charging.
• Motherboard Applications: Supplies power to various components on a motherboard requiring a stable 1.8V supply.
• Set Top Box Applications: Used in set top boxes to regulate the voltage for integrated circuits.

Features

• Low Dropout Voltage: Typically 1.2V at 800mA output current.
• Fixed Output Voltage: Provides a stable 1.8V output, eliminating the need for external resistors for voltage setting.
• Short Circuit Protection: Protects the regulator and the load from damage due to short circuits.
• Thermal Shutdown: Shuts down the regulator if the temperature exceeds a safe limit, preventing damage from overheating.
• Current Limiting: Limits the output current to a safe level, preventing damage from overloads.
• Reverse Battery Protection: Protects the regulator from damage if the battery is connected with reversed polarity. (This may need external components).

Benefits

• Increased Efficiency: The low dropout voltage results in less power dissipation and higher overall efficiency.
• Enhanced Reliability: Protection features like short circuit and thermal shutdown increase the lifespan of the regulator and the powered device.
• Simplified Design: The fixed output voltage simplifies the design process and reduces the number of required external components.
• Protection for Connected Devices: Built-in protection ensures that the connected devices receive a stable and safe voltage.

Additional Details

The SPX1117-M1.8 operates over a wide temperature range and is available in various package options. It typically requires input and output capacitors for stable operation. The device is lead-free and RoHS compliant.

Consult the datasheet for specific operating conditions, recommended capacitor values, and thermal characteristics.