LP3875EMP-2.5

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

The LP3875EMP-2.5/NOPB is a fixed-output linear regulator from the LP387x series, manufactured by Texas Instruments. It provides a nominal output voltage of 2.5 V with a maximum DC load current of 1.5 A. The device operates within an input voltage range of 2.5 V to 7 V and features ultra-low dropout characteristics, typically 38 mV at 150 mA and 380 mV at 1.5 A. It utilizes a SOT-223 package (NDC) and includes a remote voltage sense pin for improved regulation. Key electrical parameters include ±1.5% output accuracy at room temperature and a shutdown quiescent current of 10 nA.

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

• Ultra-low dropout voltage performance ensures efficient operation in low-voltage applications.
• Remote voltage sense capability improves load regulation when the regulator is distant from the load.
• Integrated short-circuit and overtemperature protection safeguards against fault conditions.
• Shutdown mode reduces quiescent current to 10 nA, minimizing power consumption during standby.

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

• Microprocessor power supplies
• GTL, GTL+, BTL, and SSTL bus terminators
• Power supplies for DSPs
• SCSI terminators

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

Verify that the specific part number corresponds to the SOT-223 package variant. Confirm the suffix indicates lead-free composition if required by assembly processes. Ensure the ordering code matches the desired output voltage tolerance and packaging format before procurement.

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

Select this component for designs requiring high efficiency near the input rail due to its low dropout voltage. The remote sense feature is critical for applications where trace resistance causes significant voltage drops between the regulator and the load point. Verify thermal dissipation requirements based on the input-to-output voltage differential and load current.

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

This device belongs to the LP387x family of fast ultra-low-dropout linear regulators developed on a CMOS process. The LP3875 variant specifically distinguishes itself from the LP3872 by including a dedicated sense pin for remote regulation. Both share similar protection features and package options, but the LP3875 offers enhanced precision for distributed power architectures.

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

LP3875EMPX-2.5/NOPB

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

How does the LP3875 improve regulation compared to the LP3872?

The LP3875 includes a SENSE pin that allows the regulator to monitor voltage directly at the remote load, compensating for voltage drops across PCB traces, whereas the LP3872 regulates only at the OUT pin.

What is the function of the ERROR flag pin?

The ERROR flag outputs a logic low signal when the regulated output voltage drops below a threshold (typically 10% below nominal), indicating conditions such as low input voltage, current limiting, or thermal limiting.