The SK1117-ADJ is an adjustable positive voltage regulator manufactured by Shikues. It's a linear voltage regulator designed to provide a stable and adjustable output voltage from a higher input voltage. The 'ADJ' suffix indicates that the output voltage can be adjusted by using external resistors.

Applications

• Post Regulation for Switching Power Supplies: Provides precise voltage regulation after a switching regulator stage.
• Battery Chargers: Used in charging circuits for various battery types.
• Adjustable Power Supplies: Allows for creating custom voltage levels for specific applications.
• Microcontroller Power Supplies: Provides a stable voltage source for microcontrollers and digital circuits.
• Linear Regulators for Noise Sensitive Circuits: Used where a clean and stable voltage is required.

Features

• Adjustable Output Voltage: Output voltage can be set using external resistors.
• Low Dropout Voltage: Maintains regulation with a small difference between input and output voltages.
• Thermal Overload Protection: Prevents damage from excessive heat.
• Short Circuit Protection: Protects the regulator from damage due to short circuits.
• High Accuracy: Provides a stable and accurate output voltage.
• Fixed Versions Available: Fixed output voltage versions are also available (e.g., SK1117-3.3, SK1117-5.0).

Benefits

• Flexibility: Adjustable output voltage provides flexibility in system design.
• Protection: Thermal overload and short circuit protection enhance reliability.
• Stable Voltage: Provides a stable voltage source for sensitive circuits.
• Easy to Use: Simple design requires few external components.
• Cost-Effective: Offers a cost-effective solution for voltage regulation.

Additional Details

The SK1117-ADJ typically comes in a TO-252 or SOT-223 package. The output voltage is set by using two external resistors, and the output voltage can be calculated using the formula Vout = 1.25(1 + R2/R1), where 1.25V is the internal reference voltage. It is important to consult the datasheet for specific operating conditions and component selection. The regulator requires input and output capacitors for stability. The dropout voltage is typically around 1V at the rated current. This regulator is a good choice for applications where flexibility and protection are important.