UC2833N

Overview

The UC2833N is a precision low dropout linear controller manufactured by Texas Instruments. It operates within an input voltage range of 4.5 V to 36 V and includes a 2 V ±1% reference, error amplifier, under-voltage lockout (UVLO), and thermal shutdown. The device features a high-current driver capable of sourcing or sinking up to 450 mA, supporting both NPN and PNP external pass transistors. It utilizes a duty-ratio current limiting technique for peak load capability and fault protection. The component is housed in an 8-pin PDIP package and is specified for operation from -40°C to +85°C.

Feature Summary

• Incorporates a duty-ratio current limiting technique that provides peak load capability while limiting average power dissipation during fault conditions.
• Features a high-current driver with separate source and sink outputs, allowing compatibility with either NPN or PNP external pass transistors.
• Includes integrated under-voltage lockout (UVLO) and thermal shutdown mechanisms to ensure safe operation.

Applications

• Design of very low dropout linear regulators
• Power supply designs requiring peak load accommodation without extra heat sinking
• Short circuit protection applications

Procurement Notes

Verify the specific ordering suffix 'N' corresponds to the plastic DIP-8 package and industrial temperature range (-40°C to +85°C). Confirm RoHS compliance status as indicated in the manufacturer's documentation. Ensure the design accounts for the lifetime-buy status if applicable to long-term production requirements.

Selection Notes

Select this controller when designing low dropout regulators requiring precise current limiting and high drive capability. It supports both NPN and PNP pass devices via its dual output driver. Consider the UC2832 series if additional versatility such as adjustable current limit or logic-level disable inputs are required for the application.

Part Context

The UC2833N belongs to the UCx832/3 family of precision linear regulators. While the UC2832 series offers 14 pins with added features like adjustable current limits and separate VIN terminals, the UC2833N provides the core control functions in a cost-effective 8-pin mini-dip package. Both share the same fundamental architecture for low dropout regulation.

Replacement Considerations

UC2832N: Offers similar functionality but in a 14-pin package with additional features such as adjustable current limit and logic-level disable inputs. Verify pin compatibility and feature requirements before substitution.