LD6815TD/25P,125

Overview

The LD6815TD/25P,125 is a low dropout regulator (LDO) from the NXP LD6815 series, manufactured by NXP USA Inc. It provides a fixed nominal output voltage of 2.5 V with a maximum output current 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 auto discharge function via a pull-down switching transistor in disabled mode, ensuring a low-ohmic output state. Key electrical characteristics include a power supply rejection ratio (PSRR) of 75 dB at 1 kHz and an RMS output noise of 40 µV between 10 Hz and 100 kHz. The component is housed in a SOT753 (TSOP5) surface-mount package.

Feature Summary

• Integrates an auto discharge function using a pull-down switching transistor to provide a low-ohmic output state when disabled.
• Delivers high power supply rejection ratio (PSRR) of 75 dB at 1 kHz for effective noise suppression.
• Features ultra-low quiescent current of 0.1 µA in shutdown mode to minimize power consumption.
• Includes overcurrent protection and high-level electrostatic discharge (ESD) protection rated at 6 kV Human Body Model.

Applications

• Smartphones
• Tablet PCs
• Mobile handsets
• Portable media players

Procurement Notes

Verify the specific suffix '125' against official NXP documentation to confirm tape-and-reel packaging orientation and lot codes. Confirm that the 'P' designation correctly corresponds to the pull-down output configuration required for your circuit design. Ensure compatibility with the SOT753 package footprint and reflow soldering profiles specified in the datasheet.

Selection Notes

Select this component when a stable 2.5 V rail is needed with minimal voltage drop under 150 mA loads. The auto discharge feature is critical if rapid output voltage decay is required upon shutdown. Verify that the input voltage remains within the 2.3 V to 5.5 V range and that external capacitors meet the minimum ESR requirements for stability.

Part Context

This part belongs to the LD6815 series of small-size LDOs designed for portable electronics. The series offers various fixed output voltages ranging from 1.2 V to 3.6 V. The 'TD/25P' variant specifically denotes the 2.5 V output version with the pull-down discharge feature, packaged in the compact TSOP5 form factor suitable for space-constrained mobile devices.

Replacement Considerations

Consult NXP documentation for direct substitutes within the LD6815 family sharing the same package and pinout. Verify functional equivalence regarding the auto discharge mechanism and PSRR specifications before replacing.