LDK120C28R

Overview

The LDK120C28R is a fixed-output linear low-dropout regulator manufactured by STMicroelectronics. It provides a fixed output voltage of 2.8V with a maximum continuous output current of 200mA. The device operates within an input voltage range of up to 5.5V and features a maximum dropout voltage of 0.3V at full load. Key electrical specifications include a maximum quiescent current of 100µA, a power supply rejection ratio (PSRR) of 55dB across the 120Hz to 10kHz frequency band, and an operating temperature range from -40°C to +125°C. It is housed in a SOT-323-5 surface-mount package.

Feature Summary

• Features logic-controlled enable functionality that allows the device to enter a shutdown mode with extremely low standby current consumption.
• Incorporates internal protection mechanisms including constant current limiting for short-circuit conditions and thermal shutdown for overtemperature safety.
• Designed for stability when used with small-value ceramic output capacitors, facilitating compact printed circuit board layouts.

Applications

• Battery-powered portable electronic devices requiring efficient power management
• Low-noise analog circuits sensitive to power supply fluctuations
• Embedded systems utilizing microcontrollers or sensors with specific voltage requirements

Procurement Notes

Verify the exact suffix 'C28R' during procurement to ensure the component matches the fixed 2.8V output specification. Confirm the manufacturer is STMicroelectronics and the package type is SOT-323-5. Check RoHS compliance status and moisture sensitivity level requirements against your assembly process standards before ordering.

Selection Notes

Select this component when a stable 2.8V rail is required with moderate current demands up to 200mA. It is suitable for applications prioritizing low noise and space efficiency. Ensure the input voltage remains within the specified limits and consider the thermal dissipation capabilities of the SOT-323-5 package under expected load conditions.

Part Context

This part belongs to the LDK120 series of ultra-low-dropout linear regulators. The series is characterized by low quiescent current and high power supply rejection ratios. Other variants in the family offer different fixed output voltages or adjustable configurations, all sharing similar protection features and packaging options designed for modern compact electronics.

Replacement Considerations

Publicly confirmed substitute part numbers include MIC5376-2.8YC5-TR and TC1185-2.8VCT713 from Microchip Technology. Verify pin compatibility and electrical parameters before substitution.