LDL1117S30R

Product Overview

The LDL1117S30R from STMicroelectronics is a linear voltage regulator IC that provides a fixed positive 3 V output from a single regulator. It is intended for surface-mount use in SOT-223 packaging and supports an output current of 1.2 A. The device accepts an input voltage up to 18 V and specifies a maximum dropout of 0.6 V at 1.2 A. Its quiescent current is 500 µA, and the junction temperature operating range is -40°C to 125°C.

Key Features

• Fixed positive 3 V output from a single regulator
• 1.2 A output current
• Maximum input voltage of 18 V
• Maximum dropout of 0.6 V at 1.2 A
• 500 µA quiescent current
• 87 dB to 65 dB PSRR from 120 Hz to 100 kHz
• Over-current, over-temperature, and UVLO protection
• Surface-mount SOT-223 package
• Junction temperature range of -40°C to 125°C

Applications

• Regulated 3 V supply for logic circuits and sensor subsystems
• Post-regulation from a higher input rail for compact 3 V loads
• Battery-powered embedded boards requiring a fixed 3 V output

Design & Procurement Notes

Designers should verify that the input rail can exceed the 3 V output by the specified dropout margin at the intended load current, especially near the 1.2 A rating. Thermal behavior should be evaluated because the device is a linear regulator with a maximum input voltage of 18 V and a junction temperature limit of 125°C. The 500 µA quiescent current and PSRR range of 87 dB to 65 dB from 120 Hz to 100 kHz can be considered for standby and ripple-sensitive rails. The integrated over-current, over-temperature, and UVLO protections should be checked against system fault requirements. For layout and procurement, confirm the SOT-223 / TO-261-4, TO-261AA package designation to ensure the correct footprint and mounting method.