UC2834DWG4

Overview

The UC2834DWG4 is a high-efficiency linear regulator controller designed for low input-output differential applications. It operates within an input voltage range of 5V to 35V and supports both positive and negative regulator designs. The device features two precision references: +1.5V and -2.0V, alongside a 200mA sink or source drive output capable of driving external pass devices. It includes an adjustable current sense amplifier with a threshold typically at 150mV. The integrated fault monitoring circuit provides under-voltage and over-voltage alerts with programmable delay, plus a 100mA crowbar drive output for over-voltage protection. It utilizes a 16-pin SOIC package.

Feature Summary

• Supports both positive and negative linear regulator topologies using external pass devices
• Includes internal +1.5V and -2.0V precision references for flexible design implementation
• Features an adjustable current sense amplifier for precise load current limiting
• Provides fault alert outputs with programmable delay and a dedicated crowbar drive for over-voltage conditions

Applications

• Low input-output differential linear power supply designs
• High output current systems utilizing external pass transistors
• Power architectures requiring simultaneous positive and negative regulation rails
• Systems necessitating precise current limiting and over-voltage protection mechanisms

Procurement Notes

Verify the specific suffix G4 indicates lead-free and RoHS compliance status prior to procurement. Confirm the 16-SOIC package dimensions match the target PCB footprint requirements. Ensure the operating temperature range aligns with the intended environmental conditions. Check for any recent product change notices regarding pinout or electrical characteristics updates from Texas Instruments.

Selection Notes

Select this component when designing linear regulators with minimal voltage drop requirements. It is suitable for applications needing robust fault detection including under-voltage and over-voltage scenarios. Consider the need for external pass devices to handle the primary load current. Evaluate the requirement for programmable fault delays to prevent nuisance tripping during transient events.

Part Context

This part belongs to the UC1834 family of high-efficiency linear regulator controllers manufactured by Texas Instruments. The family includes variants optimized for different temperature ranges, such as the UC1834 for military/aerospace (-55°C to 125°C) and UC3834 for commercial (0°C to 70°C). The UC2834 specifically covers the industrial temperature range of -40°C to 85°C.

Replacement Considerations

UC2834DW is a direct equivalent offered by Rochester Electronics.

FAQ

How does the UC2834 handle over-voltage faults?

It activates a 100mA crowbar drive output and can latch off the driver outputs if the over-voltage latch pin is connected to the compensation/shutdown pin.

What is the function of the Threshold Adjust pin?

The Threshold Adjust pin allows users to set the current sense amplifier threshold, enabling customizable current limiting for the positive or negative supply lines.