KD1084ADT33R

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Overview

The KD1084ADT33R is a positive low-dropout voltage regulator manufactured by STMicroelectronics. It provides a fixed output voltage of 3.3 V with a guaranteed maximum output current of 5 A. The device features a typical dropout voltage of 1.3 V at full load and maintains an output tolerance of ±1% at 25 °C for the 'A' version. It operates within a junction temperature range of -40 °C to +125 °C and utilizes DPAK surface-mount packaging.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Feature Summary

• Provides up to 5 A of output current with a typical dropout voltage of 1.3 V at maximum load.
• Delivers a fixed 3.3 V output with tight voltage tolerance specifications for precision applications.
• Quiescent current flows into the load rather than being wasted, increasing overall system efficiency compared to PNP regulators.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Applications

• General-purpose power supply regulation
• Post-regulation for switching converters
• Battery-powered systems requiring efficient linear regulation

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Procurement Notes

Verify component authenticity through authorized channels as this part number may be subject to obsolescence or replacement by newer revisions. Confirm that the specific ordering suffix matches the required package type and tolerance grade before finalizing procurement orders to ensure compatibility with existing designs.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Selection Notes

Select this component when a stable 3.3 V rail is required with high current capability. Ensure input voltage remains sufficiently above the output voltage to account for the specified dropout characteristics under varying thermal conditions. Verify that external capacitor values meet the minimum stability requirements outlined in the datasheet.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Part Context

This device belongs to the KD1084xx family of low-dropout regulators designed for high-current applications. It offers pin-to-pin compatibility with older three-terminal adjustable regulators while providing improved performance regarding dropout voltage and output tolerance. The family includes both adjustable and fixed-output variants available in DPAK and D2PAK packages.

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators Replacement Considerations

KD1084DT33R (Standard version with ±2% tolerance)

Voltage Regulators - Linear, Low Drop Out (LDO) Regulators FAQ

What is the minimum capacitance required for stability?

Only a 10 µF minimum capacitor is needed for stability.

How does the quiescent current behavior differ from PNP regulators?

Unlike PNP regulators where quiescent current is wasted, the KD1084 quiescent current flows into the load, thereby increasing efficiency.