LT3088IST#PBF

Updated: 2026-08-30

Overview

The LT3088IST#PBF is a high-performance linear voltage regulator manufactured by Analog Devices. It is part of the LT3080 family, known for its precision and reliability in demanding applications. This IC is housed in a surface-mount package (SOT-223) and is widely used in industrial, telecommunications, and precision electronic systems. The regulator offers a low dropout voltage, making it suitable for applications where the input voltage is close to the output voltage. Its adjustable output voltage (from 0V to 36V) and high accuracy (±1%) make it a versatile choice for designers seeking stable power solutions.

Structure and Working Principle

The LT3088IST#PBF operates as a linear regulator, meaning it adjusts the output voltage by dissipating excess power as heat. It consists of a reference voltage source, error amplifier, and pass transistor. The regulator maintains a constant output voltage by comparing the feedback voltage to an internal reference. A key feature of this IC is its ability to handle high currents (up to 800mA) with minimal dropout voltage (typically 350mV at full load). The device also includes thermal shutdown and current limit protection, safeguarding it from overheating and overcurrent conditions.

Key Features

The LT3088IST#PBF stands out for its low dropout voltage, which ensures efficient operation even when the input voltage is only slightly higher than the output. This feature is particularly valuable in battery-powered applications where every millivolt counts. Other notable features include its high accuracy (±1% over line, load, and temperature variations), wide input voltage range (1.5V to 36V), and thermal protection. The adjustable output voltage (set via a single resistor) adds to its flexibility in various circuit designs.

Application Areas

This regulator is commonly used in industrial control systems where stable voltage is critical for sensitive analog circuits. Its precision makes it suitable for instrumentation and measurement equipment. In telecommunications, the LT3088IST#PBF provides clean power to RF circuits and baseband processors. It's also found in medical devices, automotive electronics, and portable equipment where reliable voltage regulation is essential.

Maintenance and Precautions

Proper heat sinking is crucial when operating the LT3088IST#PBF near its maximum ratings. The thermal resistance of the package (62°C/W for SOT-223) means that at high currents and large voltage differentials, significant heat may be generated. Designers should ensure adequate PCB copper area for heat dissipation and consider forced air cooling in high-temperature environments. Input voltage should never exceed the absolute maximum rating (40V), and output capacitors should be selected according to the manufacturer's recommendations for stability.

B2B Procurement Guide

When procuring LT3088IST#PBF in bulk, verify the manufacturer's authenticity as counterfeit semiconductors are a growing concern in the industry. Consider purchasing directly from authorized distributors or through franchised channels. Lead times can vary based on market demand, so plan procurement accordingly. For prototype quantities, many distributors offer sample programs. Pricing typically decreases significantly at quantity breaks (e.g., 100, 500, or 1000 pieces).