FPF2165 Fairchild Semiconductor, FPF2165 Datasheet - Page 10

• Manufacturer Part Number: FPF2165
• Description: IC LOAD SWITCH ADJ CURR 6-MLP
• Manufacturer: Fairchild Semiconductor
• Type: High Side Switchr

Specifications of FPF2165

• Number Of Outputs: 1
• Rds (on): 160 mOhm
• Internal Switch(s): Yes
• Current Limit: Adjustable
• Voltage - Input: 1.8 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 6-MLP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: FPF2165TR

FPF2163/4/5 Rev. I
Application Information
Typical Application
Setting Current Limit
The FPF2163, FPF2164, and FPF2165 have a current limit
which is set with an external resistor connected between ISET
and GND. This resistor is selected by using the following
equation,
The table below can also be used to select R
application would be the 500mA current that is required by a
single USB port. Using the table below an appropriate selection
for the R
port load could draw 525mA, but not more than 875mA.
Likewise for a dual port system, an R
deliver at least 1125mA and never more than 1875mA
Current Limit Various R
Battery
1.8V-5.5V
R
1100
1380
1830
185
220
275
306
345
394
460
550
610
690
790
920
[Ω]
SET
SET
R
SET
resistor would be 394Ω. This will ensure that the
Min. Current
is in Ohms and that of I
1125
Limit
[mA]
938
750
675
600
525
450
375
338
300
263
225
188
150
113
R
SET
C1 = 4.7µF
=
Typ. Current
OFF ON
SET
275.6
I
LIM
1500
1250
1000
Limit
[mA]
900
800
700
600
500
450
400
350
300
250
200
150
Values
SET
LIM
of 185Ω would always
is Amps
Max. Current
SET
Limit
1875
1562
1250
1125
1000
[mA]
875
750
625
563
500
438
375
313
250
188
. A typical
V
ON
IN
FPF2163/4/5
(1)
10
GND
Input Capacitor
To limit the voltage drop on the input supply caused by transient
in-rush currents when the switch is turned 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 0.1uF capacitor C
GND. This capacitor will prevent parasitic board inductances
from forcing V
FPF2163 and FPF2164, the total output capacitance needs to
be kept below a maximum value, C
part from registering an over-current condition and turning-off
the switch. The maximum output capacitance can be
determined from the following formula,
Power Dissipation
During normal operation as a switch, the power dissipated in the
part will depend upon the level at which the current limit is set.
The maximum allowed setting for the current limit is 1.5A and
this will result in a power dissipation of,
If the part goes into current limit the maximum power dissipation
will occur when the output is shorted to ground. For the
FPF2163, the power dissipation will scale by the Auto-Restart
Time, t
that the maximum power dissipated is,
P(max) =
FLAGB
RSTRT
V
ISET
OUT
P = (I
IN
C
OUT
, and the Over Current Blanking Time, t
and GND. A 4.7µF ceramic capacitor, C
=
OUT
LIM
(max) =
t
30 + 450
BLANK
below GND when the switch turns-off. For the
)
2
30
IN
OUT
x R
t
BLANK
pin. A higher value of C
, should be placed between V
DS
+ t
R
RSTRT
SET
I
= (1.5)
C2 = 0.1µF
LIM
x 5.5 x 1.5 = 515.6mW
(max) x t
2
x V
x 0.12 = 270mW
V
OUT
IN
IN
BLANK
(max) x I
(max), to prevent the
LOAD
(min)
IN
www.fairchildsemi.com
LIM
can be used to
R2 = 499Ω
(max)
IN
BLANK
, must be
OUT
, so
and
(2)
(3)
(4)