The BL1117C-3.3V is a low dropout (LDO) linear voltage regulator manufactured by BELLING. It is designed to provide a stable and regulated 3.3V output voltage from a higher input voltage. This type of regulator is commonly used in various electronic devices to ensure a consistent power supply for sensitive components like microcontrollers, sensors, and memory chips. Its low dropout voltage makes it suitable for applications where the input voltage is close to the desired output voltage.

Applications

• Microcontroller power supplies.
• Sensor power supplies.
• Memory power supplies.
• Battery-powered devices.
• Post-regulation for switching power supplies.
• General-purpose voltage regulation.

Features

• Low dropout voltage: Operates with a small difference between input and output voltage.
• Fixed 3.3V output voltage: Provides a stable and precise output voltage.
• Overcurrent protection: Protects the regulator and the load from overcurrent conditions.
• Overtemperature protection: Shuts down the regulator if it overheats.
• Short-circuit protection: Protects the regulator from short circuits.
• Low quiescent current: Minimizes power consumption in standby mode.

Benefits

• Stable and regulated 3.3V power supply for sensitive components.
• Extended battery life in portable devices due to low quiescent current.
• Increased system reliability with built-in protection features.
• Simplified system design with a fixed output voltage.
• Cost-effective solution for voltage regulation.

Additional Details

The BL1117C-3.3V typically supports a wide range of input voltages, often up to 15V or higher, depending on the specific variant. The dropout voltage is typically around 1V at the rated output current. The regulator requires external capacitors for stability, typically ceramic capacitors with low ESR (Equivalent Series Resistance). These capacitors help to filter noise and improve transient response. The output current capability varies depending on the package type and thermal conditions, but is commonly in the range of 800mA to 1A. Proper heat sinking may be required to dissipate heat generated by the regulator at higher output currents. The device is often available in surface mount packages like SOT-223, SOT-89, and TO-252. Its low dropout voltage and protection features make it suitable for a wide range of applications where a stable and reliable 3.3V power supply is needed.