LD6805K/21P,115

Overview

The LD6805K/21P,115 is a fixed-output Low Dropout Regulator (LDO) from the NXP LD6805 series. It provides a nominal output voltage of 2.1 V with a maximum output current rating of 150 mA. The device operates within an input voltage range of 2.3 V to 5.5 V and features a typical dropout voltage of 250 mV at full load. It incorporates an integrated pull-down switching transistor that ensures a low-ohmic output state in disabled mode for auto discharge functionality. The regulator is housed in a DFN1010C-4 plastic package.

Feature Summary

• High power supply rejection ratio of 75 dB at 1 kHz
• Integrated auto discharge function via pull-down transistor in disabled mode
• Low quiescent current consumption in shutdown mode
• Ultra-low RMS output noise voltage

Applications

• Powering analog and digital interfaces requiring lower than standard supply voltages
• Mobile appliances such as smart phones and cordless telephones
• Portable media players and personal navigation devices
• Digital still cameras and mobile internet devices

Procurement Notes

Verify the specific suffix '115' against official documentation to confirm packaging details or tape-and-reel specifications. Ensure the selected component matches the required 2.1 V output voltage and the pull-down enabled variant. Confirm compliance with environmental standards such as RoHS and halogen-free requirements before procurement.

Selection Notes

Select this component when a compact LDO with high PSRR and active output discharge is required. The pull-down feature distinguishes it from the high-ohmic variants suitable for different system reset behaviors. Ensure the application input voltage remains within the 2.3 V to 5.5 V range and that the load does not exceed the 150 mA current limit.

Part Context

This part belongs to the LD6805 series of low-dropout regulators designed for portable applications. The series offers various fixed output voltages ranging from 1.2 V to 3.6 V. The 'P' suffix indicates the inclusion of an auto discharge function, contrasting with the 'H' suffix which provides a high-ohmic state upon disable.

Replacement Considerations

LD6805K/21H,115: Provides the same electrical parameters but lacks the auto discharge pull-down transistor, resulting in a high-ohmic output state when disabled.