POWER SWITCHING CIRCUIT WITH LOW OFFSET VOLTAGE
Original Publication Date: 1989-Aug-01
Included in the Prior Art Database: 2001-Nov-06
In some battery powered products, a secondary back-up cell is used to provide power to memory while the primary battery is being changed. A power switching circuit with low offset voltage and low current drain is needed to connect the memory to the back-up cell when the primary battery is removed and the supply voltage starts to drop.