Overview

Features and Benefits

  • Low Dropout, 430mV at 10A Output Current
  • Fast Transient Response
  • Remote Sense
  • 1mV Load Regulation
  • Fixed 2.5V Output and Adjustable Output
  • No Supply Sequencing Problems in Dual Supply Mode

Product Details

The LT1581 is a 10A low dropout regulator designed to power the new generation of microprocessors. The dropout voltage of this device is 100mV at light loads rising to just 430mV at 10A. To achieve this dropout a second low current input voltage 1V greater than the output voltage is required. The device can also be used as a single supply device where dropout is comparable to an LT1584.

Several other new features have been added to the LT1581. A remote SENSE pin is brought out. This feature virtually eliminates output voltage variations due to load changes. Typical load regulation for a load current step of 100mA to 10A, measured at the SENSE pin, is less than 1mV.

The LT1581 has fast transient response, equal to the LT1584. On fixed voltage devices, the ADJUST pin is brought out. A small capacitor on the ADJUST pin further improves transient response.

This device is ideal for generating processor supplies of 2V to 3V on motherboards where both 5V and 3.3V supplies are available.

Applications

  • Microprocessor Supplies
  • Post Regulators for Switching Supplies
  • High Current Regulators
  • 5V to 3.XXV for Pentium® Processors Operating at 90MHz to 166MHz and Beyond
  • 3.3V to 2.9V for Portable Pentium Processor
  • PowerPC Series Power Supplies

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Tools & Simulations

LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

LTspice

Models for the following parts are available in LTspice:

LT1581
LT1581-2
LT1581-2.5

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

Discussions

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The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.


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