The AMS1117T-ADJ is an adjustable voltage regulator from HGSEMI, designed to provide a stable and adjustable output voltage for a variety of electronic applications. It's a three-terminal device available in a SOT-223 package, making it suitable for surface mount assembly. This regulator is commonly used in applications where a precisely regulated voltage is needed and where the input voltage is higher than the desired output voltage.

Applications:

• Linear Regulators for Microprocessors
• Post Regulators for Switching Supplies
• Battery Chargers
• Power Management in Portable Electronics

Features:

• Adjustable Output Voltage: The output voltage can be adjusted using two external resistors, allowing for customization to specific voltage requirements.
• Low Dropout Voltage: Typically 1.3V at 1A, enabling operation with a smaller difference between input and output voltages, improving efficiency.
• Current Limiting: Built-in current limiting protects the regulator and the load from overcurrent conditions.
• Thermal Shutdown: Prevents damage due to excessive heat by shutting down the regulator when the junction temperature exceeds a safe limit.
• High Accuracy: Provides a precise and stable output voltage, ensuring reliable performance of connected circuits.
• SOT-223 Package: Compact surface mount package for efficient PCB assembly.

Benefits:

• Versatile Voltage Regulation: The adjustable output allows the same regulator to be used in multiple applications with different voltage requirements, reducing component inventory.
• Improved Efficiency: The low dropout voltage minimizes power dissipation, leading to longer battery life in portable devices.
• Enhanced Protection: Current limiting and thermal shutdown protect the regulator and the load from damage due to electrical faults or overheating.
• Stable Performance: The high accuracy output voltage ensures consistent and reliable operation of the connected circuits.
• Simplified Design: Requires only a few external components, simplifying circuit design and reducing board space.

Additional Details:

The AMS1117T-ADJ operates over a wide input voltage range and provides a typical output current of 1A. The adjustable output voltage can be set using the formula: Vout = 1.25V * (1 + R2/R1), where R1 and R2 are the external resistors connected to the adjust pin. It is crucial to select appropriate resistor values to achieve the desired output voltage and ensure stable operation. The datasheet specifies recommended capacitor values for input and output decoupling to improve stability and reduce noise.

This voltage regulator is a reliable solution for applications requiring a regulated adjustable output voltage, offering protection features and stable performance in a compact package.