LD1117ADT18TR

The LD1117ADT18TR is a high quality three-terminal voltage regulator IC which belongs to PMIC - Voltage Regulators - Linear. It has many features like very low drop-out voltage, overload protection, and current limit protection. Both positive and negative voltage polarity are available. The LD1117ADT18TR is available in an SOT-223 package at an operating voltage of 18V, with a maximum output current of 2.2A.

The LD1117ADT18TR is used in a wide range of application fields, such as +12V, +5V, and +3.3V I/O circuits, battery operated systems, on-board powersupplies, LCD monitors, etc. It is suitable for applications where high reliability, low ripple, and low ESR are required.

The working principle of LD1117ADT18TR is based on the idea of a linear regulator, which is to use a series pass element to regulate the output voltage of a power supply. The series pass element is inserted between the input source and the output load. The series pass element can be a transistor, a MOSFET, or an IC which acts as a series pass transistor. The output voltage of the power supply is regulated by adjusting the series pass element’s resistance or current. In the LD1117ADT18TR, the series pass element is an internal voltage regulator IC, which is typically adjusted by a voltage divider connected between it and the output voltage.

The LD1117ADT18TR has two different protection mechanisms: overload protection and current limit protection. The overload protection is activated when the current passing through the regulator is too high and the regulator\'s transistor is overloaded. In this case, the transistor shuts off, reducing the output voltage and protecting the IC from damage.The current limit protection is activated when the voltage on the regulator is too high and the current is over a certain threshold. In this case, the regulator shuts off, and the output voltage is reduced to protect the IC from damage.

The LD1117ADT18TR provides good linear regulation with very low DC output voltage errors, low ripple, and low ground current. It is also capable of delivering enough current for most applications without the need for a heat sink. Furthermore, it has temperature protection to prevent the device from exceeding its temperature limit.

In conclusion, the LD1117ADT18TR is a high quality three-terminal voltage regulator IC with many useful features. Its application field covers a wide range, from +12V, +5V, and +3.3V I/O circuits to battery operated systems, on-board power supplies, and LCD monitors. It has two main protection mechanisms, overload protection and current limit protection. Its main functions include low drop-out voltage, good linear regulation, low ripple, and low ground current. Finally, the LD1117ADT18TR supports temperature protection feature to protect it against over heating.