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LT3080EST#PBF

LT3080EST#PBF

Analog Devices
Adjustable linear regulator with similar high-voltage input capability and 1 A class output for flexible designs.
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Overview

The LT3080EST#PBF is an adjustable positive linear regulator that supports up to 36 V input and delivers about 1.1 A of output current. It can be programmed down to 0 V output and exhibits a measured dropout of about 1.6 V at full load. The device has a low quiescent current and is intended for low-noise post-regulation and flexible single-rail power designs.

Why Choose This Part

Choose the LT3080 when you need a flexible, adjustable linear regulator with a high maximum input voltage and the ability to program the output down to 0 V. Its roughly 1.1 A output capability and modest dropout (about 1.6 V at full load) make it suitable for many post-regulation tasks, and the low quiescent current helps when idle power must be minimized. It is straightforward to use in discrete designs and integrates well where low output noise is required.

Applications

Low-noise post-regulation
Clean up switching-regulator outputs for analog, RF, or precision measurement circuitry where low output noise is important.
Adjustable bench or on-board power rails
Provide a user-adjustable single supply from a wide input range for prototypes, labs, or configurable boards.
Battery-powered systems
Regulate from higher-voltage battery stacks or adapt varying battery voltages to a stable rail while limiting idle current draw.
Small signal and sensor systems
Supply sensitive sensors and op amp networks that need a stable, low-noise supply up to about an amp of load.

Key Specifications

PSRR 75db ~ 20dB (120Hz ~ 1MHz)
Output Type Adjustable
Mounting Type Surface Mount
Package / Case TO-261-4, TO-261AA
Current - Output 1.1A
Protection Features Over Current, Over Temperature, Short Circuit
Number of Regulators 1
Output Configuration Positive
Operating Temperature -40degC ~ 125degC
Voltage - Input (Max) 36V
Voltage Dropout (Max) 1.6V @ 1.1A
Current - Supply (Max) 30 mA
Voltage - Output (Max) 36V
Supplier Device Package SOT-223-3
Current - Quiescent (Iq) 500 uA
Voltage - Output (Min/Fixed) 0V

Getting Started

Read the manufacturer datasheet and follow the recommended input and output capacitor types and values, and the set-resistor or programming network shown in application circuits. Start on a breakout or evaluation PCB and test initially with a current-limited bench supply to verify thermal behavior and power dissipation at your intended Vin-Vout and load. Pay attention to thermal management: with high Vin-Vout and near 1 A load you will need adequate heatsinking or PCB copper to keep the package within safe junction temperatures.