Overview

Features and Benefits

  • 2.5A Step-Down Supercapacitor Charger and 2.5A Step-Up Backup Supply
  • 6.5A Switches for 2.5A Backup from One Supercapacitor or Two in Series
  • Input Current Limit Prioritizes Load over Charge Current
  • Input Disconnect Switch Isolates Input During Backup
  • Automatic Seamless Switch-Over to Backup Mode
  • Internal Supercapacitor Balancer (No External Resistors)
  • Programmable Charge Current and Charge Voltage
  • Input Power Fail Indicator
  • System Power Good Indicator
  • Optional OVP Circuitry Protects Device to >60V
  • Constant Frequency Operation
  • Thermally Enhanced 24-Lead 4mm × 5mm QFN Package

Product Details

The LTC®4041 is a complete supercapacitor backup system for 2.9V to 5.5V supply rails. It contains a high current step-down DC/DC converter to charge a single supercapacitor or two supercapacitors in series. When input power is unavailable, the step-down regulator operates in reverse as a step-up regulator to backup the system output from the supercapacitor(s).

The LTC4041’s adjustable input current limit function reduces charge current to protect the input supply from overload while an external disconnect switch isolates the input supply during backup. When the input supply drops below the adjustable PFI threshold, the 2.5A boost regulator delivers power from the supercapacitor to the system output.

An optional input overvoltage protection (OVP) circuit protects the LTC4041 from high voltage damage at the VIN pin. An internal supercapacitor balancing circuit maintains equal voltages across each supercapacitor and limits the maximum voltage of each supercapacitor to a pre-determined value. The LTC4041 is available in a low profile (0.75mm) 24-Lead 4mm × 5mm QFN package.

Applications

  • Ride-Through “Dying Gasp” Supplies
  • High Current Ride-Through 3V to 5V UPS
  • Power Meters/Industrial Alarms
  • Servers/Solid State Drives

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 (1)

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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 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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Evaluation Boards Pricing displayed is based on 1-piece.
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.