FPF2025 Fairchild Semiconductor, FPF2025 Datasheet - Page 9

• Manufacturer Part Number: FPF2025
• Description: IC LOAD SWITCH 100MA 6-WLCSP
• Manufacturer: Fairchild Semiconductor
• Type: High Side Switchr

Specifications of FPF2025

• Number Of Outputs: 1
• Rds (on): 315 mOhm
• Internal Switch(s): Yes
• Current Limit: 150mA
• Voltage - Input: 1.6 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 6-WLCSP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

©2008 Fairchild Semiconductor Corporation
FPF2024/5/6/7 Final. B
Description of Operation
FPF2024-FPF2027 series Full-Function switches are current
limited load switches with ultra-low power consumption. The
core of each device consists of a 230mW P-channel MOSFET
featuring slow turn-on to limit the inrush current, fast turn-off,
current
shutdown protection features and a FLAGB output that
indicates that a fault condition has occurred.
Some versions in the FPF202x series also feature Current Limit
Blanking and Auto-Restart.
The FPF202x family achieves an ultra-low current consumption
of
implementation. Full functionality is guaranteed for operating
voltages down to 1.6V over the -40°C to +85°C temperature
range.
Sleep and Wakeup Mode Description
The ultra-low power consumption of FPF2024-FPF2027 is
achieved through the implementation of proprietary Sleep/
Wakeup modes.
The FPF2024-FPF2027 family turns on in Startup mode where
it checks for potential load current, temperature, and under-
voltage faults for 10ms. If no faults are detected during this
startup period, the FPF2024-FPF2027 goes into a Sleep mode
where it stays for 257ms. At the end of the Sleep period, the
part goes into Wakeup mode to check for any fault condition. If
no fault is detected in 1ms, the part goes back to Sleep mode.
The 1:257 Wakeup/Sleep duty cycle results in an overall
average current consumption of 1 µA (typ).
During Sleep mode the thermal and under-voltage conditions
are not monitored to reduce the current consumption of the
device.
The switch current limiting circuitry is active at all times and
protects the FPF2024-FPF2027 against excessive load currents
in all modes.
While in the Wakeup mode, a current fault event will prevent the
part from re-entering into Sleep mode even if input voltage and
temperature faults are not present. In such a case, the part
functions according to its feature set, e.g., it performs its normal
Blanking, Auto-Restart or Latch-off functions as expected. If the
over-current condition is removed from the output, the part will
go back into Sleep mode after 10ms. The representative state
diagrams of the FPF2024-FPF2027 are given in Figure 21,
Figure 22 and Figure 23.
The ultra-low quiescent current consumption of 1µA along with
the very-low minimum operating voltage of 1.6V, make the
FPF2024-FPF2027 an ideal full-function load switch for ultra-
portable applications.
1µA
limit,
through
UVLO(under-voltage
a
proprietary
”Sleep-Wakeup
lockout)
and
thermal
modes”
9
On/Off Control
The ON pin controls the state of the switch. The FPF2024-
FPF2027
configurations
requirements. FPF2024, FPF2026 and FPF2027 are active high
switches while the FPF2025 is an active low device. Applying a
continuous high or low signal depending on the switch
configuration, will hold the switch in the ON state. The load
switch will move into the OFF state when the ON pin is inactive.
In addition, FPF2026 moves into the OFF state if a current fault
is encountered for longer duration than the Blanking Time. For
all versions, an undervoltage on V
excess of 140°C overrides the ON control and turns off the
switch.
In addition, a current fault condition longer than the Blanking
Time will cause the switch to turn off in the FPF2024, FPF2025
and FPF2026. The FPF2024 and FPF2025 have an Auto-
Restart feature which will automatically turn the switch on again
after 70ms. For the FPF2026, the ON pin must be toggled to
turn the switch on again. The FPF2027 does not turn off in
response to an over current condition, and remains in a
constant current mode for so long as the ON pin is active, and
the thermal shutdown or UVLO are not activated.
The ON pin control voltage and V
recommended operating ranges. The ON pin voltage can be
driven by a voltage level higher than the input voltage.
Fault Reporting
Over-current, input under-voltage, or over-temperature fault
conditions are signaled out by the FLAGB pin going low.
FPF2024, FPF2025 and FPF2026 have a current fault blanking
feature which prevents current faults lasting shorter than the
Blanking Time of 10ms (typ) from triggering the fault signal
(FLAGB) output.
If the over-current condition persists beyond the Blanking Time,
the FPF2024 and FPF2025 pull the FLAGB pin low and shut the
switch off. If the ON pin is kept active, an Auto-Restart feature
releases the FLAGB pin and turns the switch on again after
70ms.
If the over-current condition persists beyond the Blanking Time,
the FPF2026 has a Latch-Off feature which pulls the FLAGB pin
low and shuts the switch off. The switch is kept off and the
FLAGB pin is kept low until the ON pin is toggled.
The FPF2027 responds to an overload condition by immediately
pulling the FLAGB pin low and the switch remains in constant
current mode until the output overload condition is removed.
The FPF2027 has a Start-Up Blanking feature which prevents
current faults related to start-up transients from triggering the
FLAGB output. The Startup Blanking feature is effective for the
first 10ms (typ) following device turn-on via ON pin.
The FPF2024, FPF2026 and FPF2027 have an open-drain
MOSFET FLAGB output which requires a pull-up resistor
between V
recommended. The FPF2025 has a CMOS FLAGB output and
does not require a pull-up resistor. During shutdown, the pull-
down on FLAGB is disabled to reduce current draw from the
supply.
IN
series
and FLAGB. A 100KΩ pull up resistor is
to
features
accommodate
both
IN
or a junction temperature in
IN
active
pin have independent
various
high
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application
and
low