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FPF2148 Datasheet
Full Function Load Switch
Fairchild Semiconductor
Fairchild Semiconductor


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FPF2148 pdf
Application Notes
Startup Power Sequence
VIN1 FPF2148 VOUT1
VIN1
ON OFF
PGOOD
ONB
GND
FLAGB
100K
VIN2 Any Active HI VOUT2
Load Switch
VIN2
FLAGB
ON GND
To Load
To Load
Power good function in sequential startup. No battery is loaded to the output
Sequential Startup using Power Good
The power good pin can be connected to another active high
load switch’s enable pin to implement sequential startup.
PGOOD pin asserts low when the load switch is OFF. This
feature allows driving a subsequent circuit. The diagram above
illustrates power good function in sequential startup. As the
VOUT1 of the FPF2148 starts to ramp to the 90% of its input
voltage the active high switch remains in OFF state. Whereas
the VOUT1 passes the 90% threshold, power good signal
becomes active and asserts high. This signal will turn on the
active high load switch and VOUT2 will start to increase. The
total startup time may vary according to the difference between
supply voltages that are used in the application.
FPF2148 Rev. H
10 www.fairchildsemi.com

FPF2148 Datasheet PDF



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