LD6815TD/36P,125

Overview

The LD6815TD/36P,125 is a low dropout regulator (LDO) from NXP Semiconductors featuring a fixed nominal output voltage of 3.6 V and a maximum output current of 150 mA. It operates within an input voltage range of 2.3 V to 5.5 V. The device incorporates an auto discharge function via a pull-down switching transistor in disabled mode, providing a low-ohmic output state. Key electrical characteristics include a typical dropout voltage of 250 mV at full load, a power supply rejection ratio (PSRR) of 75 dB at 1 kHz, and an RMS output noise of 40 µV across the 10 Hz to 100 Hz frequency band.

Feature Summary

• Integrated pull-down switching transistor provides a low-ohmic output state for rapid discharge when disabled
• High-level electrostatic discharge protection rated at 6 kV under Human Body Model conditions
• Ultra-high power supply rejection ratio ensures effective suppression of input voltage ripples and noise
• Low quiescent current consumption in shutdown mode minimizes system power drain

Applications

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

Procurement Notes

Verify the specific suffix 'P' confirms the inclusion of the internal pull-down auto-discharge feature, distinguishing it from high-ohmic variants. Confirm the package designation matches the TSOP5 (SOT753) form factor required for the target PCB layout. Ensure the ordering code aligns with the 3.6 V nominal output specification. Cross-reference the manufacturer's latest datasheet revision to confirm current product status and availability constraints.

Selection Notes

Select this component when a stable 3.6 V rail is required with minimal voltage drop under 150 mA loads. The pull-down feature is essential for applications necessitating fast output capacitor discharge upon shutdown. Verify that the external load capacitance meets the minimum stability requirement of 0.7 µF. Consider the thermal resistance characteristics if operating near the upper ambient temperature limits.

Part Context

This part belongs to the LD6815 series of small-size low dropout regulators manufactured using monolithic silicon technology. The series offers various fixed output voltages ranging from 1.2 V to 3.6 V. The 'P' suffix specifically denotes the variant equipped with the auto-discharge functionality, whereas 'H' variants provide a high-ohmic state. All devices share the same compact SOT753 plastic package dimensions.

Replacement Considerations

LD6815TD/36H,125: Substitute only if the auto-discharge function is not required, as this variant provides a high-ohmic state instead.