MAXIM
APPLICATION NOTE 3864
By: Bich Pham
Jul 25, 2006
Abstract: This power-supply sequencer senses a loss of the main supply voltage and, by controlling the two FETs, automatically switches the load to the secondary (backup) supply.
The Figure 1 circuit provides a "diode-OR" function for applications that must switch automatically between the main and backup supply voltages. Such applications include battery-backed memory supplies and any battery-operated device with a wall-adapter connection.
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| Figure 1. This power-supply sequencer senses a loss of the main supply voltage and, by controlling the two FETs, automatically switches the load to the secondary (backup) supply. |
View MAX6819/MAX6820 Datasheet
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