LP3871ES-5.0/NOPB

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

The LP3871ES-5.0/NOPB is a fixed-output low-dropout linear regulator manufactured by Texas Instruments, providing a stable 5.0V output with a maximum continuous current of 0.8A. It operates within an input voltage range of 2.5V to 7.0V and features ultra-low dropout characteristics, typically 24mV at 80mA load and 240mV at full load. The device includes an error flag for status monitoring, shutdown capability with 10nA quiescent current, and integrated overcurrent and thermal protection. It is housed in a TO-263-5 surface-mount package and supports operation across a junction temperature range of -40°C to +125°C.

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

• Ultra-low dropout voltage performance ensures efficient regulation under minimal input-to-output differential conditions.
• Integrated error flag pin provides logic-level indication when the output voltage drops below nominal thresholds.
• Shutdown mode significantly reduces power consumption by lowering quiescent current to approximately 10nA.
• Built-in thermal and overcurrent protection safeguards the device against short circuits and excessive heat.

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

• Microprocessor power supplies requiring fast transient response
• GTL, GTL+, BTL, and SSTL bus terminators
• Power supplies for digital signal processors (DSPs)
• Post-regulators for high-efficiency linear applications

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

Verify that the component matches the specific LP3871ES-5.0/NOPB designation to ensure correct output voltage and package type. Confirm RoHS compliance and NOPB lead-free status as indicated in official documentation. Check datasheet requirements for external capacitor selection, particularly ESR limits for stability. Ensure proper PCB layout practices are followed to maintain thermal performance and prevent instability due to ground loops.

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

Select this regulator for applications requiring precise 5.0V regulation with high current capability up to 0.8A. Consider the TO-263-5 package for its thermal dissipation advantages in surface-mount designs. Evaluate the need for the error flag feature if system monitoring is required. Ensure input voltage remains within the 2.5V to 7.0V range and verify that ambient temperatures allow for adequate heat dissipation without additional heatsinking.

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

This component belongs to the LP3871/LP3874 series of fast ultra-low dropout linear regulators developed on a CMOS process. The series offers multiple output voltage options ranging from 1.8V to 5.0V with guaranteed accuracy. The LP3871 variant specifically includes an error flag, while the LP3874 variant features a remote sense pin for improved load regulation. Both variants share similar electrical characteristics and protection features.

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

LP3871ESX-5.0/NOPB: Same functional specifications but supplied in tape and reel packaging instead of rail packaging.

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

How does the error flag function?

The error flag pin outputs a logic low signal when the output voltage drops more than 10% below the nominal value due to low input voltage, current limiting, or thermal limiting. It requires a pull-up resistor between 10kΩ and 1MΩ.

What are the minimum capacitor requirements for stability?

An input capacitor of at least 10µF is required. The output capacitor must also be at least 10µF and located close to the device. Tantalum capacitors are recommended due to their ESR characteristics falling within the stable region.

Can the device operate in shutdown mode?

Yes, pulling the SD pin low activates shutdown mode, reducing quiescent current to typically 10nA. The pin must be actively terminated through a 10kΩ pull-up resistor for proper operation unless driven by a source that actively pulls high and low.