UC3834N

Overview

The UC3834N is a high-efficiency linear regulator controller designed for low input-output differential applications. It supports both positive and negative regulator designs using an external pass device, requiring less than 0.5V dropout at 5A load. The IC features adjustable current sense amplifiers and fault monitoring circuits that detect under-voltage and over-voltage conditions with programmable delays. It includes a crowbar drive output for over-voltage protection and internal thermal shutdown. The component operates within a temperature range of 0°C to +70°C.

Feature Summary

• Supports both positive and negative linear regulator topologies with an external pass device
• Includes adjustable threshold current sense amplifier for precise current limiting
• Provides fault alert outputs for under-voltage and over-voltage conditions with programmable delay
• Features a 100mA crowbar drive output activated by sustained over-voltage faults

Applications

• Low dropout linear power supply design
• High efficiency voltage regulation systems
• Power supplies requiring over-voltage protection and crowbar functionality

Procurement Notes

Verify the UC3834N status as Not Recommended for New Designs (NRND) before finalizing procurement plans. Confirm package type availability and lead finish specifications against the latest Texas Instruments documentation. Ensure compliance with RoHS and environmental requirements specified in the addendum. Validate operating temperature ranges suitable for the target application environment.

Selection Notes

Select this component for applications requiring low differential voltage between input and output. Consider the need for external pass devices to handle high output currents up to 5A. Evaluate the requirement for programmable fault delays and crowbar protection mechanisms. Verify compatibility with both positive and negative regulator architectures based on system polarity needs.

Part Context

The UC3834N belongs to the UC1834/UC2834/UC3834 family of integrated circuits optimized for linear regulator designs. This family provides precision references and error amplifiers to facilitate stable voltage regulation. The UC3834 variant specifically targets commercial temperature ranges, distinguishing it from military or space-qualified versions within the same functional family.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material.