UC2833DW

Voltage Regulators - Linear Regulator Controllers Overview

The UC2833DW is a precision low dropout linear controller manufactured by Texas Instruments, designed for use with external NPN or PNP pass transistors. It operates within an input voltage range of 4.5 V to 36 V and features a 2 V ±1% reference. The device includes an error amplifier, under-voltage lockout (UVLO), and thermal shutdown protection. It provides a high current driver capable of sourcing or sinking up to 450 mA. The IC utilizes a duty-ratio current limiting technique to manage peak load capabilities while controlling average power dissipation during fault conditions.

Voltage Regulators - Linear Regulator Controllers Feature Summary

• Incorporates a duty-ratio current limiting technique that enables peak load capability while restricting average power dissipation of the external pass transistor during fault conditions.
• Features a high-current driver output capable of both sourcing and sinking current, allowing compatibility with either NPN or PNP external pass transistors.
• Includes integrated under-voltage lockout (UVLO) and thermal shutdown mechanisms to ensure safe operation across varying supply and temperature conditions.

Voltage Regulators - Linear Regulator Controllers Applications

• Designing very low dropout linear regulators requiring precise control functions
• Power supply systems needing peak load accommodation without additional heat sinking
• Applications utilizing short circuit protection via programmable duty-ratio timers

Voltage Regulators - Linear Regulator Controllers Procurement Notes

Verify the specific suffix 'DW' confirms the SOIC-16 surface mount package configuration. Confirm the operating temperature range aligns with industrial specifications (-40°C to +85°C). Ensure the component meets RoHS compliance standards as indicated in the packaging data. Cross-reference the manufacturer part number against official TI documentation to validate authenticity and revision status before procurement.

Voltage Regulators - Linear Regulator Controllers Selection Notes

Select this controller when designing linear regulators that require precise current limiting without foldback characteristics. It is suitable for applications demanding high drive currents for external pass devices. Consider the duty-ratio timer functionality if managing large output capacitance during short-circuit recovery is necessary. Verify that the required output voltage range and input supply constraints fit within the specified operational limits.

Voltage Regulators - Linear Regulator Controllers Part Context

The UC2833DW belongs to the UCx832/3 series of precision linear regulator controllers from Texas Instruments. This family integrates essential control functions including a precision reference, error amplifier, and UVLO. The DW suffix denotes the plastic small outline integrated circuit package variant. It serves as a core component for building custom linear power supplies with enhanced fault protection capabilities.

Voltage Regulators - Linear Regulator Controllers Replacement Considerations

UC2832DW: Offers similar functionality but includes additional pins for adjustable current limit and logic-level disable inputs.

Voltage Regulators - Linear Regulator Controllers FAQ

How does the UC2833DW handle short circuit conditions?

It employs a gated-astable timer that switches the pass device on and off at a programmable duty ratio. This limits the average power dissipation while allowing higher peak current during the on-time, accommodating short circuits without extra heat sinking.

Can the UC2833DW drive both NPN and PNP transistors?

Yes, the IC features a high current driver with both source and sink outputs, enabling the use of either NPN or PNP external pass transistors in the regulator design.