TEXAS INSTRUMENTS LM1086 Fixed Voltage Regulator, 3.3V, 1.5A, TO-263

The TEXAS INSTRUMENTS LM1086CS-3.3/NOPB is a high-performance, low-dropout (LDO) positive voltage regulator designed for efficient power management. It delivers a fixed 3.3V output with a maximum current of 1.5A, making it an ideal choice for stabilising voltage in a wide range of electronic circuits. The device features a remarkably low dropout voltage of just 1.3V, ensuring stable operation even when the input voltage is very close to the desired output level, thereby maximising battery life and efficiency in portable applications.

Engineered for reliability, the regulator integrates several key protection features. These include built-in current limiting and thermal shutdown, which safeguard the IC and the connected load from damage due to excessive current or overheating. The circuit is centred around a precision Zener-trimmed band gap reference, contributing to its excellent regulation performance with a typical line regulation of 0.015% and load regulation of 0.1%.

For easy design-in and replacement, this fixed-output version integrates the necessary adjust resistors internally and shares the same pin-out configuration as the industry-standard LM317. It is supplied in a robust TO-263-3 surface-mount package (also known as D²PAK), suitable for automated assembly processes. The device is specified for an input voltage range from 2.6V to 27V and can operate across a broad temperature range from 0°C to 125°C.

Key Applications

This regulator is perfectly suited for power management tasks in various electronic systems, including:

• Post-regulation for switching power supplies
• Microprocessor and microcontroller power supplies
• Battery-powered equipment
• Instrumentation and industrial controls

Its stable performance, protective features, and industry-standard footprint make the LM1086 a dependable and versatile solution for creating clean, regulated power rails.