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Active Backup Solution for 3.3 V systems

This circuit can provide backup power for a 3.3 V system. It does this using a set of electric double-layer capacitors (EDLCs) as the energy storage element. The MAX38890 2.5 V to 5.5 V, Reversible Buck/Boost Regulator for Backup Applications charges and discharges the EDLCs with up to 2.5 A (set using a timer). Energy moves from the bus to the capacitor during normal operation (bus > 3.08 V) and is used to keep the bus at 3 V during power supply dropouts. The PCB can be used on a breadboard and gives access to all of the IC's communication pins. It also has options to increase the energy storage capacity by adding more EDLCs.

Reference

<p>System Block Diagram</p>

Diagram 1

Features

  • 3.3 V micro-UPS functionality
  • Low Quiescent Current in Ready State
  • 1A to 5A Peak Inductor Current Limit
  • High peak efficiency (up to 94%)

Products

Super Capacitor: EDLC ENYCAP™

Circuit Providing Backup Power from an EDLC Super Capacitor

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Inductor: IHLP0806

IHLP® High Temperature (165 °C), Automotive Power Inductors

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Tantalum Capacitors: T55 vPolyTan™

vPolyTanTM Polymer Surface-Mount Chip Capacitors, Molded Case, High Performance Type

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