FPF2106 Fairchild Semiconductor, FPF2106 Datasheet - Page 9

• Manufacturer Part Number: FPF2106
• Description: IC SWITCH LOAD FULL FUNC SOT23-5
• Manufacturer: Fairchild Semiconductor
• Series: IntelliMax™r
• Type: High Side Switchr

Specifications of FPF2106

• Number Of Outputs: 1
• Rds (on): 160 mOhm
• Internal Switch(s): Yes
• Current Limit: 400mA
• Voltage - Input: 1.8 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-5, SC-74A, SOT-25
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: FPF2106TR; FPF2106_NL; FPF2106_NLTR; FPF2106_NLTR

FPF2100-FPF2107 Rev. H
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/Off Control
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 V
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.
IN
or a junction temperature in excess of 150°C
9
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 V
currents may flow and can cause permanent damage to the
device. FPF2100-FPF2107 is designed to control current flow
from V
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.
IN
to V
OUT
.
OUT
pin is larger than the V
www.fairchildsemi.com
IN
pin, large