LP2981IM5-3.6

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

The LP2981IM5-3.6 is a micropower, fixed-output voltage regulator designed for battery-powered applications. It delivers a guaranteed 100 mA output current with an ultra-low dropout voltage of typically 200 mV at full load and 7 mV at 1 mA. The device features a logic high enable input (ON/OFF) that reduces quiescent current to less than 1 µA in shutdown mode. It operates within a supply voltage range of 2.1 V to 16 V and provides a fixed 3.6 V output with 0.75% tolerance accuracy. Integrated protections include overcurrent limiting and overtemperature shutdown.

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

• Ultra-low dropout voltage performance optimized for battery life extension
• Logic-controlled ON/OFF pin enables deep sleep mode with minimal power consumption
• Integrated thermal and current protection safeguards against overload conditions

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

• Cellular phones
• Palmtop and laptop computers
• Personal digital assistants (PDA)
• Camcorders and personal stereos

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

Verify the specific suffix and grade requirements against the original design specifications. Confirm package availability as standard distribution formats may vary by region. Ensure the sourcing channel provides authentic components from authorized distributors to guarantee electrical characteristics and reliability standards are met.

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

Select this component when low quiescent current and tight output voltage tolerance are critical for portable electronics. The SOT-23 package offers a compact footprint suitable for space-constrained designs. Consider the required output capacitance and ESR range to ensure loop stability across the full operating temperature spectrum.

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

This part belongs to the LP2981 family of micropower regulators manufactured originally by National Semiconductor and now under Texas Instruments. The series utilizes VIP process technology to achieve superior performance metrics compared to standard LDOs. The IM5 designation indicates the surface-mount SOT-23-5 package variant.

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

LP2981AIM5-3.6

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

How does the ON/OFF pin function affect power consumption?

Pulling the ON/OFF input low shuts down the regulator, reducing the quiescent current to less than 1 µA. Driving it high turns the device on.

What are the stability requirements for the output capacitor?

The output capacitor must maintain its Equivalent Series Resistance (ESR) within a stable range over the full operating temperature. Tantalum capacitors are recommended, while ceramic capacitors may require a series resistor to prevent oscillation.