LDR1833K7-R

Overview

The LDR1833K7-R is a dual low-dropout linear voltage regulator manufactured by STMicroelectronics, housed in a 7-SPAK surface-mount package. It provides two fixed output voltages: Output 1 at 1.8 V with a maximum current of 500 mA, and Output 2 at 3.3 V with a maximum current of 1 A. The device supports an input voltage up to 15 V and features a typical supply voltage rejection ratio of 70 dB at 120 Hz. Quiescent current is typically 50 µA in OFF mode and maximizes at 1.6 mA in ON mode. Operating temperature range spans from -40 °C to +125 °C.

Feature Summary

• Dual independent regulators providing 1.8 V and 3.3 V outputs with logic-controlled electronic shutdown for each channel.
• Very low dropout characteristics ensuring efficient power delivery under varying load conditions.
• Integrated thermal and current limiting protection mechanisms to safeguard against overload scenarios.
• Compatible with low-value, low ESR output capacitors for stable operation.

Applications

• Personal Digital Assistants (PDA)
• Microdrive systems
• Data storage applications
• Consumer monitors
• Set-top boxes

Procurement Notes

Verify component authenticity through authorized channels as the part status is obsolete. Confirm package integrity and pin alignment upon receipt. Review the datasheet for absolute maximum ratings to prevent damage during handling. Ensure compliance with RoHS3 specifications if required by your manufacturing standards. Validate that the specific ordering suffix matches your design requirements before finalizing procurement.

Selection Notes

Select this component when designing circuits requiring simultaneous 1.8 V and 3.3 V rails from a single high-voltage source. Consider its low quiescent current for battery-powered or energy-efficient designs. Evaluate the thermal resistance and ambient operating conditions to ensure adequate heat dissipation within the specified junction temperature limits. Verify that the required output currents do not exceed the 500 mA and 1 A limits for the respective channels.

Part Context

This device belongs to the LDR18xx series of very low drop dual voltage regulators. It shares architectural similarities with the LDR2533 but differs in output voltage configurations. The PPAK package facilitates surface-mount assembly while providing robust thermal performance. This family targets portable electronics and consumer appliances where space constraints and power efficiency are critical design parameters.

Replacement Considerations

Consult official documentation for direct substitutes. No confirmed public substitute part numbers are available in the provided source material.