LP3872EMPX-3.3/NOPB

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

The LP3872EMPX-3.3/NOPB is a fixed-output linear regulator from the LP387x series, manufactured by Texas Instruments. It provides a nominal output voltage of 3.3 V with an input supply range of 2.5 V to 7 V. The device supports a maximum DC output current of 1.5 A and operates within a junction temperature range of -40°C to 125°C. It utilizes a SOT-223 (NDC) package. Key electrical characteristics include a typical dropout voltage of 38 mV at 150 mA and 380 mV at 1.5 A load. Quiescent current in shutdown mode is typically 10 nA.

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

• Ultra-low-dropout performance for efficient operation near input voltage limits
• Integrated shutdown mode significantly reduces quiescent current consumption
• Built-in error flag pin indicates when output voltage drops below regulation threshold
• Includes overcurrent and overtemperature protection mechanisms

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
• Post regulators

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

Verify that the specific part number matches the required SOT-223 package configuration. Confirm the fixed 3.3 V output voltage aligns with system requirements. Ensure the component meets RoHS3 compliance standards if applicable to the manufacturing process. Cross-reference the datasheet revision history for any updates to thermal or electrical specifications before finalizing procurement.

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

Select this component for applications requiring high transient response and low dropout voltage under heavy loads up to 1.5 A. Consider the SOT-223 package size constraints and thermal resistance values provided in the datasheet. Evaluate the need for the ERROR flag feature for system monitoring. Verify that the input voltage remains within the 2.5 V to 7 V operating range during all conditions.

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 family includes variants like the LP3875 which adds a remote sense pin for improved load regulation. The LP3872 variant specifically features an error flag but lacks the sense pin found in the LP3875. Both share similar electrical characteristics and protection features.

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

LP3872EMP-3.3/NOPB

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

Does the LP3872EMPX-3.3/NOPB have a remote voltage sense pin?

No, the LP3872 does not have a sense pin. Only the LP3875 variant includes the SENSE pin for remote voltage regulation.

How is the ERROR flag pin configured?

The ERROR flag has an open-drain output stage and must be pulled high through a resistor ranging from 10 kΩ to 1 MΩ. If unused, it should be connected to ground.

What is the minimum output capacitance required for stability?

A minimum output capacitance of 10 µF is required for stable full-load operation. Tantalum capacitors are recommended due to their ESR characteristics.