Backup battery switch with first power up control
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United States of America Patent
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Jul 21, 1998
Grant Date -
N/A
app pub date -
Nov 18, 1996
filing date -
Nov 18, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A switching circuit for switching between a main power supply and a battery power supply only after first power up includes a switch, a first power up transfer transistor and a first power up latch. The switch switches between the main and battery power supplies and provides one of the main and battery power supplies to a switched power supply node. The first power-up transfer transistor is connected on input to the switched power supply node. The first power up latch is powered by a switched power supply from the switched power supply node and is connected on output to a gate of the first power-up transfer transistor. The first power up latch produces an activation signal to the gate upon and after first power up of the main power supply.
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