LP2981-28DBVRE4

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

The LP2981-28DBVRE4 is a fixed-output, ultra-low-dropout linear regulator manufactured by Texas Instruments. It provides a nominal output voltage of 2.8 V with a standard grade tolerance of ±1.25%. The device delivers a continuous load current of 100 mA and features an input voltage range up to 16 V. Typical dropout voltage is 200 mV at full load. Quiescent current is typically 600 μA at 100 mA load, reducing to 0.01 μA in shutdown mode. It includes overcurrent and thermal protection.

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

• Ultra-low dropout performance utilizing a vertical PNP pass element for efficient regulation under minimal input-output differentials.
• Integrated shutdown control via the ON/OFF pin enables deep sleep currents for extended battery life in portable systems.
• Built-in safety mechanisms include overcurrent limiting and thermal shutdown to protect against fault conditions.

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

• Mobile phones
• Laptops
• Personal digital assistants (PDAs)
• Digital cameras and camcorders
• CD and MP3 players

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

Verify the specific 'E4' suffix indicates lead-free compliance status as defined in the Package Option Addendum. Confirm active production status and environmental classification directly with Texas Instruments or authorized distributors before finalizing procurement plans.

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

Select this component for designs requiring a fixed 2.8 V rail with moderate current demands. Ensure output capacitor selection meets minimum capacitance and ESR requirements to maintain stability. Verify that the input voltage never drops below the required biasing threshold during operation.

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

This part belongs to the LP2981 family of micropower LDO regulators. It shares the SOT-23-5 package and functional architecture with variants offering different fixed output voltages such as 2.9 V, 3.0 V, 3.3 V, and 5.0 V. The 'Standard Grade' designation distinguishes it from the higher precision 'A Grade' counterparts.

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

LP2981-28DBVR

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

What is the function of Pin 4 on the LP2981-28DBVRE4?

Pin 4 is designated as NC (No Connect) and must be left open. It should not be connected to any circuit node.

How does the LP2981 handle reverse voltage conditions between input and output?

An internal diode exists across the pass element. If the output voltage exceeds the input voltage, an external Schottky diode must be connected between the output and input to prevent latch-up and potential damage.