The LD1117AG-1.5V is a low dropout (LDO) positive voltage regulator manufactured by UTC (Unisonic Technologies Co., Ltd.). It is designed to provide a stable and regulated 1.5V output voltage from a higher input voltage, even when the input voltage is close to the desired output voltage. Its low dropout characteristic makes it particularly suitable for battery-powered and portable applications where maintaining a stable output voltage is crucial even as the battery discharges.

Applications

• Battery chargers
• Post regulators for switching power supplies
• Microprocessor power supplies
• Motherboards
• Graphic cards

Features

• Low dropout voltage
• 1A output current capability
• Fixed 1.5V output voltage
• Thermal overload protection
• Short circuit protection
• Reverse polarity protection

Benefits

• Allows for operation with a small difference between input and output voltage, maximizing battery life
• Can supply sufficient current for a wide range of applications
• Simplifies circuit design
• Protects the regulator from overheating
• Prevents damage from short circuits
• Protects the regulator from damage due to reverse polarity connection

Additional Details

The LD1117AG-1.5V has a dropout voltage that is typically around 1.2V at full load. It is available in various packages, including SOT-223 and TO-252. An external output capacitor is required for stability. The recommended capacitor value is typically between 10µF and 22µF. The input voltage range can typically go up to 15V. The thermal overload protection shuts down the regulator when the junction temperature exceeds a certain threshold, preventing damage. Proper heat sinking might be required when operating at high input voltages or high output currents.