Texas Instruments

LP38856SX-1.2

LP38856SX-1.2 Description

The LP38856SX-1.2 from Texas Instruments is a high-performance, fixed-output linear voltage regulator designed to deliver a stable 1.2V output at up to 3A with exceptional efficiency. This obsolete but reliable regulator operates within an input voltage range up to 5.5V, making it suitable for a variety of low-voltage applications. Its low dropout voltage of 0.45V (max) at 3A ensures minimal power dissipation, while the 300 µA quiescent current enhances energy efficiency. The device is housed in a DDPAK/TO-263-5 surface-mount package, optimized for thermal performance and compact PCB layouts.

LP38856SX-1.2 Features

• High Current Output: Delivers 3A with precision, ideal for power-hungry circuits.
• Low Dropout Voltage: 0.45V (max) @ 3A minimizes heat generation and improves efficiency.
• Advanced Protection: Includes over-current, over-temperature, short-circuit, and UVLO protection for robust operation.
• Low Quiescent Current: 300 µA reduces power consumption in standby modes.
• Excellent PSRR: 80dB to 65dB (120Hz–1kHz) ensures clean output in noisy environments.
• Enable Control: Features an enable pin for power management flexibility.
• Surface-Mount Design: TO-263-5 package with MSL 3 (168 hours) moisture sensitivity for reliable assembly.

LP38856SX-1.2 Applications

The LP38856SX-1.2 excels in applications requiring high-current, low-voltage regulation with minimal dropout, such as:

• Point-of-Load (POL) Regulation: Powering FPGAs, ASICs, and microprocessors in embedded systems.
• Industrial Electronics: Stable voltage supply for sensors, actuators, and control modules.
• Telecom Infrastructure: Supporting base stations and networking equipment with clean power delivery.
• Consumer Electronics: Ideal for set-top boxes, gaming consoles, and high-performance audio/video systems.

Conclusion of LP38856SX-1.2

The LP38856SX-1.2 stands out for its high current capability, low dropout, and robust protection features, making it a dependable choice for demanding low-voltage applications. While marked as obsolete, its performance metrics—such as 80dB PSRR and 3A output—ensure it remains viable for legacy designs or systems prioritizing reliability. Engineers seeking a compact, efficient linear regulator for high-current loads will find this device particularly advantageous.