概览

优势和特点

  • 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

产品详情

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

产品生命周期 icon-recommended 量产

该产品系列中至少有一个型号已量产并可供采购。该产品适合用于新设计,但也可能有更新的替代产品。

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所示报价为单片价格。所列的美国报价单仅供预算参考,指美元报价(每片美国离岸价),如有修改恕不另行通知。由于地区关税、商业税、汇率及手续费原因,国际报价可能不同。