Data Sheet

© 2012 Fairchild Semiconductor Corporation www.fairchildsemi.com
FPF3040 • Rev. 2.4.3 4
FPF3040 — IntelliMAX™ 18 V-Rated Dual Input Single Output Power-Source-Selector Switch
Pin Configuration
Figure 4. Pin Assignment (Top View)
Figure 5. Pin Assignment (Bottom View)
Pin Description
Pin #
Name
Input / Output
Description
A1, B1, C1
V
BUS
Input / Output
V
BUS
at USB: Power input / output.
bi-directional switch when V
IN_SEL
= LOW.
A4, B4, C4
V
IN
Input / Output
V
IN
Supply Input: Power input / output.
bi-directional switch when V
IN_SEL
= HIGH.
A2, A3, B3, C3
V
OUT
Input / Output
Switch Output: Power input / output.
C2
EN
Input
Enable: Active HIGH.
EN voltage ≥ 2.5 V can power internal circuit when V
IN
and V
BUS
are absent.
1 MΩ pull-down resistor is included.
D4
V
IN_SEL
Input / Output
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 V
IN
to V
OUT
/ LOW = switch V
BUS
to V
OUT
.
Status output during EN=LOW:
HIGH = V
IN
is used for V
OUT
/ LOW = V
BUS
is used for V
OUT
.
D3
DF_IN
Input
Default Supply Selector during EN=LOW: Input.
Floating = VBUS connects to V
OUT
.
LOW means V
IN
connects to V
OUT
.
This signal is ignored during EN=HIGH. 1 µA pull-up current
source is included.
B2
Other_V
IN_AVA
Output
Other Supply Input Status: Open-drain output.
HI-Z = both V
IN
and V
BUS
are valid.
LOW = the other power source is not valid.
D1, D2
GND
Ground