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FPF3040 Datasheet
18V-Rated Dual Input Single Output Power-Source-Selector Switch
Fairchild Semiconductor
Fairchild Semiconductor


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FPF3040 pdf
Pin Configuration
Figure 4. Pin Assignment (Top View)
Figure 5. Pin Assignment (Bottom View)
Pin Description
Pin #
A1, B1, C1
A4, B4, C4
A2, A3, B3, C3
C2
D4
D3
B2
D1, D2
Name
VBUS
VIN
VOUT
EN
VIN_SEL
DF_IN
Other_VIN_AVA
GND
Input / Output
Description
Input / Output
Input / Output
Input / Output
VBUS at USB: Power input / output.
bi-directional switch when VIN_SEL = LOW.
VIN Supply Input: Power input / output.
bi-directional switch when VIN_SEL = HIGH.
Switch Output: Power input / output.
Input
Enable: Active HIGH.
EN voltage ≥ 2.5 V can power internal circuit when VIN and VBUS
are absent.
1 pull-down resistor is included.
Input / Output
Input
Supply Selector & Status: Input power source selection input
and status output. This signal is ignored during EN=LOW.
Selector input during EN=HIGH:
HIGH = switch VIN to VOUT / LOW = switch VBUS to VOUT.
Status output during EN=LOW:
HIGH = VIN is used for VOUT / LOW = VBUS is used for VOUT.
Default Supply Selector during EN=LOW: Input.
Floating = VBUS connects to VOUT.
LOW means VIN connects to VOUT.
This signal is ignored during EN=HIGH. 1 µA pull-up current
source is included.
Output
Other Supply Input Status: Open-drain output.
HI-Z = both VIN and VBUS are valid.
LOW = the other power source is not valid.
Ground
© 2012 Fairchild Semiconductor Corporation
FPF3040 Rev. 2.4.3
4
www.fairchildsemi.com

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