UC3834NG4

Overview

The UC3834NG4 is a high-efficiency linear regulator controller manufactured by Texas Instruments. It supports positive or negative regulator designs with an external pass device, requiring less than 0.5V input-output differential at 5A loads. The IC features adjustable low-threshold current sensing and fault monitoring for under/over-voltage conditions. It includes a programmable delay for transient rejection and a 100mA crowbar drive output for over-voltage protection. The device operates within a temperature range of 0°C to +70°C.

Feature Summary

• Supports both positive and negative linear regulator topologies using an external pass device
• Includes integrated fault monitoring with programmable delay for under and over-voltage alerts
• Features a 100mA crowbar drive output activated during sustained over-voltage faults
• Provides adjustable current sense amplifier threshold for precise load protection

Applications

• Low input-output differential linear power supply design
• High efficiency positive voltage regulation systems
• High efficiency negative voltage regulation systems
• Power supplies requiring over-voltage latch and shutdown capabilities

Procurement Notes

Verify the UC3834NG4 status as NRND (Not Recommended for New Designs) before procurement. Confirm that the PDIP-16 package matches your board layout requirements. Ensure the commercial temperature range of 0°C to +70°C meets your operational environment specifications. Check for updated replacement components if new designs are required.

Selection Notes

Select this component when designing linear regulators with minimal dropout voltage requirements. It is suitable for applications needing robust fault protection including crowbar outputs and programmable delays. Consider the 200mA driver capability for controlling external pass transistors. Verify compatibility with existing thermal management strategies given the internal thermal shutdown feature.

Part Context

The UC3834 belongs to the UC1834 family of high-efficiency linear regulator controllers from Texas Instruments. This family includes variants like the UC1834 and UC2834, differentiated primarily by operating temperature ranges. The NG4 suffix indicates a lead-free, RoHS-compliant version in a PDIP-16 package. These devices are designed to simplify the implementation of precision linear power supplies.

Replacement Considerations

The UC3834N is the non-green equivalent part number. For new designs, consider alternative active linear regulator controllers as this specific variant is marked NRND.