FPF2200 Fairchild Semiconductor, FPF2200 Datasheet - Page 9

• Manufacturer Part Number: FPF2200
• Description: IC LOAD SWITCH 500MA 6-MICROFET
• Manufacturer: Fairchild Semiconductor
• Type: High Side Switchr

Specifications of FPF2200

• Number Of Outputs: 1
• Rds (on): 185 mOhm
• Internal Switch(s): Yes
• Current Limit: 500mA
• Voltage - Input: 1.8 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 6-MLP, 6-MicroFET™
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: FPF2200TR

FPF2200-FPF2202 Rev. B
Description of Operation
The FPF2200, FPF2201, and FPF2202 are state of the art High
Precision Current Limit switches designed to meet USB OTG
(On-The-Go) applications with optimum current for a safe
design practice. The core of each device is a 0.16
MOSFET and a controller capable of functioning over an input
operating range of 1.8- 5.5V. The controller protects or offers
current limiting, UVLO(undervoltage lockout) and thermal
shutdown protection. The minimum current limit value is set to
500mA allowing to draw as much as 500mA from the USB port.
On/Off Control
The ON pin is active high, and controls the state of the switch.
Applying a continuous high signal will hold the switch in the ON
state. The switch will move into the OFF state when the active
high is removed, or if a fault is encountered. For all versions, an
undervoltage on V
140°C overrides the ON control to turn off the switch.
In addition, excessive currents will cause the switch to turn off in
the FPF2200 and FPF2201. The FPF2200 has an Auto-Restart
feature which will automatically turn the switch ON again after
450ms. For the FPF2201, the ON pin must be toggled to turn-on
the switch again. The FPF2202 does not turn off in response to
an over current condition but instead remains operating in a
constant current mode so long as ON is active and the thermal
shutdown or UVLO have not activated.
Fault Reporting
Upon the detection of an over-current condition, an input UVLO,
or an over-temperature condition, the FLAGB signals the fault
mode by activating LO. In the event of an over-current condition
for the FPF2200 and FPF2201, the FLAGB goes LO at the end
of the blanking time while FLAGB goes LO immediately for the
FPF2202. If the over-current condition lasts longer than
blanking time, FLAGB remains LO through the Auto-Restart
Time for the FPF2200 while for the FPF2201, FLAGB is latched
LO and ON must be toggled to release it. With the FPF2202,
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. A 100K
recommended to be used in the application.
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. The minimum current at which the parts will
limit is set to 500mA. The FPF2200 and FPF2201 have a
blanking time of 30ms (nominal) during which the switch will act
as a constant current source. At the end of the blanking time,
the switch will be turned-off. The FPF2202 has no current limit
blanking period so it will remain in a constant current state until
the ON pin is deactivated or the thermal shutdown turns-off the
switch.
IN
or a junction temperature in excess of
pull up resistor is
P-channel
9
Undervoltage Lockout (UVLO)
The undervoltage lockout turns-off the switch if the input voltage
drops below the undervoltage lockout threshold. With the ON
pin active the input voltage rising above the undervoltage
lockout threshold will cause a controlled turn-on of the switch
which limits current over-shoots.
Output Discharge Resistor
The FPF2200/1/2 family contains an 80
for quick output discharge when the switch is turned off. This
features become more attractive when application requires
large output capacitor to be discharged when switch turns-off.
However, V
battery source due to the discharge mechanism of the load
switch.
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.
OUT
The
pin should not be connected directly to the
switch
automatically
on-chip load resistor
turns-on
www.fairchildsemi.com
again
if