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Active Backup Solution for 3.3 V systems

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EDLCBU-3V3

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 Design Files

Datasheet

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 Design Files

Datasheet

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EDLCBU-3V3

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System Block Diagram

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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%)

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