LDK130C-R

Overview

The LDK130C-R is a positive adjustable linear low-dropout regulator manufactured by STMicroelectronics. It delivers a maximum output current of 300 mA with an input voltage range of 1.9 V to 5.5 V. The device features a typical dropout voltage of 100 mV at 100 mA and a quiescent current of 60 µA, which reduces to less than 1 µA in shutdown mode. It offers a power supply rejection ratio of 55 dB between 120 Hz and 10 kHz. The output voltage is adjustable from 0.8 V to 5.1 V. Protection mechanisms include overcurrent limiting and thermal shutdown. It operates within a temperature range of -40°C to +125°C and is housed in a SOT-323-5 package.

Feature Summary

• Adjustable output voltage ranging from 0.8 V to 5.1 V via external resistors
• Ultra-low dropout performance for efficient battery-powered operation
• Logic-controlled enable pin for active shutdown with minimal current consumption
• Integrated short-circuit constant current limiting and thermal protection

Applications

• Post-regulation stages in automotive electronic systems
• Low-power battery-operated portable devices
• Noise-sensitive sensor power supplies
• Always-on body electronics requiring low standby current

Procurement Notes

Verify the specific suffix 'R' indicates tape-and-reel packaging when ordering. Confirm that the adjustable version requires external feedback components to set the desired output voltage. Ensure input and output capacitors meet stability requirements as specified in the official datasheet. Check RoHS compliance status for environmental regulations. Validate lead times with authorized distributors as manufacturing schedules may vary.

Selection Notes

Select this component when an adjustable output voltage is required within the 0.8 V to 5.1 V range. It is suitable for applications needing high efficiency due to its low dropout voltage. Consider the SOT-323-5 package size for space-constrained designs. Ensure the load current does not exceed 300 mA. Verify that the input voltage remains within the 1.9 V to 5.5 V operational limits under all conditions.

Part Context

The LDK130 series comprises ultra-low dropout linear regulators designed for automotive and industrial environments. This family includes fixed and adjustable versions with varying output currents. The LDK130C-R specifically provides adjustable regulation capabilities. It shares common features like low noise and high PSRR with other members of the LDK130 lineup. The series is qualified for automotive applications according to AEC-Q100 standards.

Replacement Considerations

Direct substitutes must match the adjustable output capability, 300 mA current rating, and SOT-323-5 package. Verify equivalent dropout voltage and quiescent current specifications. Ensure compatibility with ceramic output capacitors. Check if alternative parts offer similar thermal and overcurrent protection features.