UC3836N

Overview

The UC3836N is a high-efficiency linear regulator controller designed for low dropout applications. It supports adjustable output voltages ranging from 2.5V to 35V using two external resistors. The device features an internal current sense resistor and provides accurate 2.5A peak current limiting with foldback protection, reducing current to less than 0.5A during short circuits. It includes under-voltage lockout, thermal shutdown, and reverse voltage protection. The component operates within a temperature range of 0°C to +70°C and is housed in an 8-pin Mini-DIP package.

Feature Summary

• Optimized for low cost, low dropout linear regulators using an external pass element
• Integrated high gain error amplifier, precision reference, and 250mA output driver
• Foldback current limiting protects the driver device during overload conditions
• Includes under-voltage lockout and thermal shutdown for reliable operation

Applications

• Design of low dropout linear power supplies
• High current regulator systems requiring precise load regulation
• Applications necessitating remote sense capabilities

Procurement Notes

Verify the specific ordering suffix against the manufacturer's latest documentation to confirm package type and temperature grade. Confirm RoHS compliance status and environmental classification prior to procurement. Ensure the selected variant matches the required operating temperature range and pin configuration for the target application design.

Selection Notes

Select this controller when designing adjustable linear regulators requiring high efficiency and robust protection features. Consider the UC3836N for designs needing integrated foldback current limiting and thermal shutdown. Evaluate the need for external pass elements and compensation components based on the desired output voltage and current specifications.

Part Context

The UC3836N belongs to the UC1835/6 family of linear controllers manufactured by Texas Instruments. This family is optimized for low dropout linear regulator designs. The UC3836N specifically offers adjustable output voltage control, distinguishing it from fixed voltage variants like the UC3835N. It shares architectural similarities with other members of the series while providing flexibility through external resistor programming.

Replacement Considerations

UC3836D (SOIC-8 package)

FAQ

How does the UC3836N handle short circuit conditions?

The device employs foldback current limiting, which reduces the output current to less than 0.5A when a short circuit occurs, protecting the driver device.

What is the function of the internal current sense resistor?

The internal current sense resistor enables accurate 2.5A peak current limiting without requiring external sensing components, simplifying the design.