LD1117S12CTR

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PMIC - Voltage Regulators - Linear

The LD1117S12CTR is part of STMicroelectronics\' linear voltage regulator series of Low Dropout (LDO) regulators. It has many application areas and understanding its working principle can help users to better match the LD1117S12CTR to their design.

Application Field

The LD1117S12CTR can be used in a wide range of applications and system requirements. This device is suited for use in direct voltage regulation, providing 12 V output at up to 600 mA maximum output current rating. It is ideal for use in low-voltage and intermediate-voltage applications, such as powering digital circuits, as well as other general use applications such as providing power supplies for indicators, microcontrollers, FPGAs, ASICs, and other integrated circuits.

This device is versatile in that it is offered in a variety of output voltage and current specifications, allowing it to be tailored exactly to the user\'s desired voltage and current requirements. It has input voltage ranges that are compatible with a variety of input rails, and is compatible with systems such as automotive max ratings of 40 V and a 400mV dropout voltage. Furthermore, it offers an internal thermal shutdown function which trips at 165C, adding an additional layer of safety protection.

The LD1117S12CTR is provided in the standard package, which is a through-hole TO-220 package, making it easy to mount and solder on a board and eliminating the need for advanced surface-mount technologies on board as well lowers the cost of assembly.

Working Principle

The LD1117S12CTR follows the basic design of a linear regulator. It is an advanced three-terminal regulator, featuring a dropout voltage of 400mV at full-load currents of up to 600 mA. At its most basic, this regulator functions by taking an input voltage (Vin) and using an internal voltage reference to regulate the output voltage, creating an output voltage (Vout) of this regulated standard.

For example, if the user requires a 12V output voltage, the user will assign a voltage value of 12V to the reference voltage node, and the regulator will then adjust the output voltage to the designated value. This will remain the same for a given input voltage, regardless of the output current demand.

The LD1117S12CTR has high PSRR and low output noise, which allows for good ripple rejection and low noise operation even with variations in input voltage. It is also capable of outputting a very clean signal, with an output capacitor being used to improve the performance.

The LD1117S12CTR offers low quiescent current, meaning that it draws little current while idle, allowing the regulator to remain cool while limiting the self-heating that results from increased current draw. As a consequence, less voltage is dropped over the Regulation element which allows for a very low minimum input voltage and high power output with minimal power dissipation.

Conclusion

The LD1117S12CTR has many application possibilities with its wide range of voltage and current outputs and low Minimum Input Voltage rating. Its low dropout voltage allows users to reduce the power dissipation significantly and improve power efficiency. Its internal functions also increase safety, such as the Thermal Shut Down feature, making the LD1117S12CTR an excellent fit for most 12V regulator applications.

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