FPF2005 Fairchild Semiconductor, FPF2005 Datasheet - Page 10

• Manufacturer Part Number: FPF2005
• Description: IC SWITCH LOAD FULL FUNC SC70-5
• Manufacturer: Fairchild Semiconductor
• Series: IntelliMax™r
• Type: High Side Switchr

Specifications of FPF2005

• Number Of Outputs: 1
• Rds (on): 1 Ohm
• Internal Switch(s): Yes
• Current Limit: 100mA
• Voltage - Input: 1.8 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SC-70-5, SC-88A, SOT-323-5, SOT-353, 5-TSSOP
• On Resistance (max): 0.7 Ohms
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Maximum Power Dissipation: 250 mW
• Mounting Style: SMD/SMT
• Off Time (max): 0.5 us
• On Time (max): 50 us
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1.8 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: FPF2005TR; FPF2005_NL; FPF2005_NLTR; FPF2005_NLTR

FPF2000-FPF2007 Rev. H
Application Information
Typical Application
Input Capacitor
To limit the voltage drop on the input supply caused by transient
in-rush currents when the switch turns-on into a discharged load
capacitor or a short-circuit, a capacitor needs to be placed
between V
placed close to the V
further reduce the voltage drop experienced as the switch is
turned on into a large capacitive load.
Output Capacitor
A 0.1µF capacitor C
GND. This capacitor will prevent parasitic board inductances
from forcing V
FPF2000-FPF2002 and the FPF2004-FPF2006, the total output
capacitance needs to be kept below a maximum value,
C
condition and turning-off the switch. The maximum output
capacitance can be determined from the following formula,
Due to the integral body diode in the PMOS switch, a C
greater than C
C
removed. This could result in current flow through the body
diode from V
Power Dissipation
During normal operation as a switch, the power dissipation is
small and has little effect on the operating temperature of the
part. The parts with the higher current limits will dissipate the
most power and that will only be,
1.8V-5.5V
OUT
IN
P
C
can cause V
OUT
(max), to prevent the part from registering an over-current
=
(
I
LIM
=
IN
OUT
and GND. A 4.7µF ceramic capacitor, C
I
------------------------------------------------------------------- -
)
OUT
LIM
OUT
2
×
OUT
to V
(
below GND when the switch turns-off. For the
R
max
is highly recommended. A C
DS
OUT
IN
IN
to exceed V
pin. A higher value of C
.
) t
, should be placed between V
=
C1 = 4.7µF
×
V
(
IN
BLANK
0.2
OFF ON
)
2
IN
×
(
min
when the system supply is
0.7
)
=
28mW
IN
OUT
can be used to
greater than
IN
, must be
OUT
V
ON
FPF2000 - FPF2007
IN
and
(1)
(2)
IN
10
GND
If the part goes into current limit the maximum power dissipation
will occur when the output is shorted to ground. For the
FPF2000, FPF2001, FPF2004 and FPF2005, the power
dissipation will scale by the Auto-Restart Time, t
the Over Current Blanking Time, t
power dissipated is,
When using the FPF2002 and FPF2006 attention must be given
to the manual resetting of the part. Continuously resetting the
part at a high duty cycle when a short on the output is present
can cause the temperature of the part to increase. The junction
temperature will only be allowed to increase to the thermal
shutdown threshold. Once this temperature has been reached,
toggling ON will not turn-on the switch until the junction
temperature drops. For the FPF2003 and FPF2007, a short on
the output will cause the part to operate in a constant current
state dissipating a worst case power as calculated in (3) until
the thermal shutdown activates. It will then cycle in and out of
thermal shutdown so long as the ON pin is active and the short
is present.
Board Layout
For best performance, all traces should be as short as possible.
To be most effective, the input and output capacitors should be
placed close to the device to minimize the effects that parasitic
trace inductances may have on normal and short-circuit
operation. Using wide traces for V
minimize parasitic electrical effects along with minimizing the
case to ambient thermal impedance.
P max
(
FLAGB
V
)
OUT
=
=
-------------------------------------------------- - x V
t
-------------------
80
RESTART
10
+
10
t
BLANK
×
5.5
+
R1 = 100KΩ
t
BLANK
C2 = 0.1µF
×
0.2
BLANK
IN
=
(
, V
1.22mW
IN max
OUT
, so that the maximum
(
LOAD
and GND will help
)
)xI
www.fairchildsemi.com
RESTART
LIM max
R2 = 500Ω
(
, and
)
(3)
=