LDK130M18R

Overview

The LDK130M18R is a fixed-output low-dropout linear voltage regulator manufactured by STMicroelectronics. It provides a stable 1.8V output with a maximum current capacity of 300mA. The device operates within an input voltage range of 1.9V to 5.5V and features a typical dropout voltage of 100mV at 100mA load, with a maximum of 400mV at full load. It exhibits a low quiescent current of 60µA and includes an enable pin for shutdown mode consumption below 1µA. The regulator offers high power supply rejection ratio (PSRR) of 55dB and is housed in a compact SOT-23-5 surface-mount package.

Feature Summary

• Automotive-grade reliability certified under AEC-Q100 standards
• Ultra-low noise performance suitable for sensitive analog circuits
• Logic-controlled electronic shutdown for extended battery life
• Integrated short-circuit constant current limiting and thermal protection

Applications

• Low-power battery-powered automotive systems
• Portable consumer electronics requiring clean power rails
• Handheld devices utilizing ceramic output capacitors
• IoT sensor nodes needing minimal quiescent current

Procurement Notes

Verify the specific suffix 'R' indicates the standard reel packaging configuration when ordering. Confirm that the 1.8V fixed output matches the target circuit requirements, as other voltages are available in the LDK130 family. Ensure design compatibility with the required 1µF ceramic output capacitor for stability. Check for any recent product change notices regarding lead-frame updates or manufacturing site changes.

Selection Notes

Select this component when a fixed 1.8V rail is required with minimal external components. It is ideal for designs prioritizing low noise and low static current over adjustable voltage flexibility. Consider the SOT-23-5 footprint constraints and ensure adequate thermal management for continuous 300mA loads. Verify input voltage headroom against the 100mV typical dropout specification to maintain regulation.

Part Context

Part of the LDK130 series, which offers various fixed output voltages from 0.8V to 3.5V in 100mV steps. The series shares common features like low dropout, low IQ, and automotive qualification across different packages including SOT23-5L, SOT323-5L, and DFN6.

Replacement Considerations

Other LDK130 variants with different output voltages (e.g., LDK130M28R) share identical pinouts and electrical characteristics except for the output voltage. Ensure the substitute part number matches the required output voltage precisely.

FAQ

What type of output capacitor is required for stability?

The LDK130M18R is stabilized with a ceramic capacitor on the output, specifically compatible with C_OUT = 1 µF.

How does the enable function affect power consumption?

When the enable logic control puts the LDK130 in shutdown mode, the total current consumption drops to lower than 1 µA.

Is this component qualified for automotive applications?

Yes, the LDK130 series is AEC-Q100 qualified for automotive grade 1 applications using the SOT23-5L package.