LTC3643 – 2A Bidirectional Power Backup Supply




Features

  • Bidirectional Synchronous Boost Capacitor Charger/Buck Regulator for System Backup
  • Wide Input Voltage Range: 3V to 17V
  • Up to 40V Capacitor Voltage Storage for High Energy Backup
  • 2A Maximum CAP Charge Current
  • Integrated Power N-Channel MOSFETs (150mΩ Top and 75mΩ Bottom)
  • Integrated Power N-Channel MOSFET for Output/CAP Disconnect (50mΩ)
  • Input Current Limit During Charging
  • Fast 1MHz Switching Frequency
  • ±1% Reference Accuracy for System Voltage Regulation
  • Indicator Outputs for Charge Status and Input Power Fail
  • Low Profile 24-lead 3mm × 5mm QFN Package

    LTC3643 - 2A Bidirectional Power Backup Supply

    Description

    The LTC®3643 is a bidirectional synchronous step-up charger and step-down converter which efficiently charges a capacitor array up to 40V from an input supply between 3V to 17V. When the input supply falls below the programmable power-fail threshold, the step-up charger operates in reverse as a synchronous step-down regulator to power the system rail from the backup capacitor during this power interuption/failure condition.

    When charging the backup capacitor, an external low-value sense resistor may be used to maintain an accurate current limit from the input supply or implement PowerPath™ functionality.

    The step-down converter operates at a 1MHz switching frequency, allowing small external components to be used. Low quiescent current during regulation maximizes the energy usage from the backup capacitor.

    Applications




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