The UTC LD1117-ADJ-A is an adjustable voltage regulator capable of providing an output voltage ranging from 1.25V to approximately 37V, depending on the external resistor divider used. This regulator is designed for applications requiring a stable and adjustable voltage source. It is offered in various packages, including surface-mount and through-hole options. UTC (Unisonic Technologies Co., Ltd.) is a reputable manufacturer of power management and analog ICs.

Applications:

• Linear power supplies
• Battery chargers
• Post regulators for switching power supplies
• Adjustable power supplies
• Microprocessor power supplies
• Instrumentation

Features:

• Adjustable output voltage: Output voltage can be adjusted using external resistors.
• Output current of 800mA: Provides sufficient current for many applications.
• Low dropout voltage: Operates with a small difference between input and output voltage.
• Internal thermal overload protection: Prevents damage due to excessive heat.
• Short circuit protection: Protects the regulator and connected circuitry from short circuits.
• Three-terminal regulator: Simple to use with only three pins (Vin, Vout, Adjust).

Benefits:

• Versatile: Adjustable output voltage makes it suitable for a wide range of applications.
• Stable output voltage: Provides a consistent and reliable voltage source.
• Overload protection: Protects the regulator and connected circuitry from damage.
• Easy to use: Simple three-terminal configuration simplifies circuit design.
• Cost-effective: Provides a reliable and adjustable voltage regulation solution at a reasonable cost.

Additional Details:

The LD1117-ADJ-A requires external resistors to set the desired output voltage. The output voltage is determined by the formula Vout = 1.25V * (1 + R2/R1), where R1 is the resistor connected between the adjust pin and ground, and R2 is the resistor connected between the adjust pin and the output. A bypass capacitor on the output is recommended to improve stability and transient response. The dropout voltage is typically around 1.1V at the rated current. The operating temperature range is usually specified from 0°C to +125°C. The package type can vary, so it's important to check the datasheet for specific dimensions and pin assignments.