FPF2172 Fairchild Semiconductor, FPF2172 Datasheet - Page 8

• Manufacturer Part Number: FPF2172
• Description: IC LOAD MANAGEMENT ADV POWER33-6
• Manufacturer: Fairchild Semiconductor
• Series: IntelliMax™r
• Type: High Side Switchr

Specifications of FPF2172

• Number Of Outputs: 1
• Rds (on): 125 mOhm
• Internal Switch(s): Yes
• Current Limit: 200mA
• Voltage - Input: 1.8 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 6-MLP
• Power Switch Family: FPF2172
• Input Voltage: 1.8 to 5.5V
• Output Current: 200mA
• Mounting: Surface Mount
• Package Type: MLP EP
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Pin Count: 6
• Power Dissipation: 1.4W
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Maximum Power Dissipation: 1400 mW
• Mounting Style: SMD/SMT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: FPF2172TR

FPF2172 Rev. I
Description of Operation
The FPF2172 is a current limited switch that protects systems
and loads which can be damaged or disrupted by the
application of high currents. The core of the 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 paired with a low
forward voltage drop Schottky diode for reverse blocking. The
controller protects against system malfunctions through current
limiting, under-voltage lockout and thermal shutdown. The
current limit is preset for 200mA.
On/Off Control
The ON pin controls the state of the switch. Activating ON
continuously holds the switch in the on state so long as there is
no under-voltage on V
150°C. ON is active HI and has a low threshold making it
capable of interfacing with low voltage signals. When the
MOSFET is off, the Schottky diode acts as a barrier so that no
reverse current can flow when V
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. The FLAGB goes LO at the end of the
blanking time and is latched LO and ON must be toggled to
release it. FLAGB is an open-drain MOSFET which requires a
pull-up resistor between V
pull-down on FLAGB is disabled to reduce current draw from
the supply.
IN
or a junction temperature in excess of
IN
and FLAGB. During shutdown, the
OUT
is greater than V
IN
.
8
Current Limiting
The current limit guarantees that the current through the switch
doesn't exceed a maximum value while not limiting at less than
a minimum value. The minimum current is 200mA and the
maximum current is 400mA. The device has 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.
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 die from internally or
externally generated excessive temperatures. During an over-
temperature condition the FLAGB is activated and the switch is
turned-off.
temperature of the die drops below the threshold temperature.
The
switch
automatically
turns-on
www.fairchildsemi.com
again
if