FPF2100(2005) 데이터 시트보기 (PDF) - Fairchild Semiconductor
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FPF2100 Datasheet PDF : 12 Pages
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Description of Operation
The FPF2100-FPF2107 are current limited switches that protect
systems and loads which can be damaged or disrupted by the
application of high currents. The core of each device is a
0.125Ω P-channel MOSFET and a controller capable of
functioning over a wide input operating range of 1.8-5.5V. The
controller protects against system malfunctions through current
limiting, under-voltage lockout and thermal shutdown. The
current limit is preset for either 200mA or 400mA.
On/OffControl
The ON pin controls the state of the switch. Active HI and LO
versions are available. Refer to the Ordering Information for
details. Activating ON continuously holds the switch in the on
state so long as there is no fault. For all versions, an
under-voltage on VIN or a junction temperature in excess of
150°C overrides the ON control to turn off the switch. In
addition, excessive currents will cause the switch to turn off in
FPF2100-FPF2102 and FPF2104-FPF2107. The FPF2100,
FPF2101, FPF2104 and FPF2105 have an Auto-Restart feature
which will automatically turn the switch on again after 160ms.
For the FPF2102 and FPF2106, the ON pin must be toggled to
turn-on the switch again. The FPF2103 and FPF2107 do not
turn off in response to a over current condition but instead
remain operating in a constant current mode so long as ON is
active and the thermal shutdown or under-voltage lockout have
not activated.
Fault Reporting
Upon the detection of an over-current, an input under-voltage,
or an over-temperature condition, the FLAGB signals the fault
mode by activating LO. For the FPF2100-FPF2102 and
FPF2104-FPF2106, the FLAGB goes LO at the end of the
blanking time while FLAGB goes LO immediately for the
FPF2103 and FPF2107. FLAGB remains LO through the
Auto-Restart Time for the FPF2100, FPF2101 FPF2104 and
FPF2105. For the FPF2102 and FPF2106, FLAGB is latched
LO and ON must be toggled to release it.With the FPF2103 and
FPF2107, FLAGB is LO during the faults and immediately
returns HI at the end of the fault condition. FLAGB is an
open-drain MOSFET which requires a pull-up resistor between
VIN and FLAGB. During shutdown, the pull-down on FLAGB is
disabled to reduce current draw from the supply.
Current Limiting
The current limit ensures that the current through the switch
doesn't exceed a maximum value while not limiting at less than
a minimum value. For the FPF2100-FPF2103 the minimum
current is 200mA and the maximum current is 400mA and for
the FPF2104-FPF2107 the minimum current is 400mA and the
maximum current is 800mA. The FPF2100-FPF2103 have a
blanking time of 10ms, nominally, during which the switch will
act as a constant current source. At the end of the blanking
time, the switch will be turned-off and the FLAGB pin will
activate to indicate that current limiting has occurred. The
FPF2103 and FPF2107 have no current limit blanking period so
immediately upon a current limit condition FLAGB is activated.
These parts will remain in a constant current state until the ON
pin is deactivated or the thermal shutdown turns-off the switch.
Reverse Voltage
If the voltage at the VOUT pin is larger than the VIN pin, large
curents may flow and can cause permanent damage to the
device. FPF2100-FPF2107 is designed to control current flow
from VIN to VOUT.
Under-Voltage Lockout
The under-voltage lockout turns-off the switch if the input
voltage drops below the under-voltage lockout threshold. With
the ON pin active the input voltage rising above the
under-voltage lockout threshold will cause a controlled turn on
of the switch which limits current over-shoots.
Thermal Shutdown
The thermal shutdown protects the part from internally or
externally generated excessive temperatures. During an
over-temperature condition the FLAGB is activated and the
switch is turned-off. The switch automatically turns-on again if
the temperature of the die drops below the threshold
temperature.
Ordering Information
Part
FPF2100
FPF2101
FPF2102
FPF2103
FPF2104
FPF2105
FPF2106
FPF2107
Current Limit
[mA]
200
200
200
200
400
400
400
400
Current Limit
Blanking Time
[ms]
10
10
10
0
10
10
10
0
Auto-Restart
Time
[ms]
160
160
NA
NA
160
160
NA
NA
ON Pin
Activity
Active HI
Active LO
Active HI
Active HI
Active HI
Active LO
Active HI
Active HI
Top Mark
2100
2101
2102
2103
2104
2105
2106
2107
9
FPF2100-FPF2107 Rev. D2
www.fairchildsemi.com
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