LT3083EDF#PBF

Product Overview

The LT3083EDF#PBF from Analog Devices Inc. is a positive, adjustable-output linear voltage regulator for single-rail power management. It can deliver up to 3A from an input voltage up to 14V, with an output range specified from 0V to 14V. The device is supplied in a 12-DFN (4x4) surface-mount package with an exposed pad, supporting compact board layouts. Its 50.5 µA quiescent current and 1 mA maximum supply current make it suitable for designs that need low idle consumption while maintaining a regulated positive output.

Key Features

• Positive adjustable output with one regulator section and a 3A output current capability.
• Input voltage range up to 14V, with output voltage adjustable from 0V to 14V.
• Maximum dropout voltage of 0.42V at 3A allows regulation with a small input-to-output voltage difference.
• Low quiescent current of 50.5 µA and maximum supply current of 1 mA reduce idle power draw.
• PSRR from 85dB at 120Hz to 20dB at 1MHz helps attenuate input supply noise.
• Integrated over-current, over-temperature, and short-circuit protection are included.
• 12-WFDFN exposed pad and 12-DFN (4x4) surface-mount package provide a compact footprint and thermal pad.
• Operating temperature range is -40°C to 125°C.

Applications

• Adjustable 3A power rails in embedded control boards and instrumentation.
• Low-quiescent standby or auxiliary supplies in portable and battery-powered equipment.
• Regulated positive rails for analog front ends where supply-noise attenuation is useful.
• Single-output regulator positions in compact power modules using surface-mount thermal pads.

Design & Procurement Notes

When selecting the LT3083EDF#PBF, verify that the available input rail remains at or below 14V and that the required output plus dropout margin leaves sufficient headroom at 3A. The exposed-pad 12-DFN package should be incorporated into the PCB thermal plan, especially near the upper end of the -40°C to 125°C operating range. The 0.42V dropout value at 3A is useful for tight input-output voltage differences, while the 50.5 µA quiescent current and 1 mA supply current support low-idle designs. PSRR varies with frequency, so input filtering should be evaluated against the actual noise spectrum of the upstream supply. Protection features are present, but final circuit protection, layout, and thermal calculations should still be performed at the system level.