Alternative Parts


Features and Benefits

  • Not Recommended For New Designs. Contact Analog Devices for Potential Replacement.
  • Complete Battery Backup System in an SO-8, 16-Pin GN or SO Package
  • Generates Fixed Backup Voltage (3.07V/4.63V) from a Single 1.2V NiCd Button Cell
  • Automatic Main Supply to Backup Switching
  • Minimum 100mW Output Power
  • Automatic Fast Recharge of NiCd Battery
  • Programmable NiCd Trickle Charge Current
  • Smart NiCd Charger Minimizes Recharge Time and Maximizes System Efficiency After Backup
  • Onboard Power-Up and Push-Button Reset Generator
  • Performs VCC Supervisory Functions
  • Reset Assertion Guaranteed at VCC = 1V
  • Short-Circuit Protection
  • Thermal Limiting

Product Details

Not Recommended For New Designs. Contact Analog Devices for Potential Replacement.

The LTC1559 is a backup battery controller that provides all the functions necessary to implement a backup 3.3V or 5V power supply using a single NiCd cell. It includes a 1.2V to 3.07V/4.63V boost converter, an intelligent 2-stage battery charger, automatic backup switching and a microprocessor reset generator. The boost converter uses a synchronous switching architecture to achieve a typical efficiency of 70%, ensuring maximum backup lifetime from a small NiCd cell.

The on-chip NiCd charger uses an internal gas gauge to minimize fast recharge time and prevent overcharging of the backup cell, thereby improving system efficiency and extending the life of the backup cell. The LTC1559 also provides a user programmable trickle charge current to compensate for self-discharge losses in the backup cell.

The LTC1559’s automatic backup switching scheme requires minimum intervention from the host system and provides feedback to the host to minimize system loading in the backup state. Its internal VCC fault detector and reset generator eliminate the need for a separate microprocessor supervisory chip in most applications.

The LTC1559 is available in an SO-8, 16-pin GN or SO package.


  • Notebook Computers
  • Palmtop Computers/PDAs
  • Portable Instruments
  • Battery-Powered Systems

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.

Evaluation Kits (2)

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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.

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(*)The 1Ku 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. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.



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Evaluation Boards

Pricing displayed is based on 1-piece.

Up to two boards can be purchased through To order more than two, please purchase through one of our listed distributors.

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.