FPF2194 Fairchild Semiconductor, FPF2194 Datasheet - Page 11

• Manufacturer Part Number: FPF2194
• Description: IC LOAD SWITCH FULL FUNCT 6WLCSP
• Manufacturer: Fairchild Semiconductor
• Type: High Side Switchr

Specifications of FPF2194

• Number Of Outputs: 1
• Rds (on): 80 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-WLCSP
• Input Voltage: 1.8 to 5.5V
• Power Switch On Resistance: 55mOhm
• Output Current: 600mA
• Mounting: Surface Mount
• Package Type: CSP
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Pin Count: 6
• Power Dissipation: 1.2W
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: FPF2194TR

© 2009 Fairchild Semiconductor Corporation
FPF2193/4/5 • Rev. 1.0.4
Application Information
Setting Current Limit
The FPF2193, FPF2194, and FPF2195 current limit is
set with an external resistor connected between I
and GND. This resistor is selected using the following
equation:
R
Table 1 can also be used to select R
application would be the 500mA current required by a
single USB port. Using Table 1, an appropriate
selection for the R
ensures that the port load could draw 525mA, but not
more than 875mA. Likewise for a dual-port system; an
R
never more than 1875mA.
Table 1.
R
R
SET
SET
1103
1226
1379
1576
1839
2206
2758
3677
5516
SET
368
441
552
613
690
788
919
SET
(Ω)
is in Ω and I
of 368Ω always delivers at least 1125mA and
=
551
Min. Current
I
Limit(mA)
LIM
Current Limit Various R
6 .
1125
928
750
675
600
525
450
375
338
300
263
225
188
150
113
75
SET
SET
is in Amps.
resistor would be 788Ω. This
Typ. Current
Limit(mA)
1500
1250
1000
900
800
700
600
500
450
400
350
300
250
200
150
100
SET
Values
Figure 28.
SET
Max. Current
Limit(mA)
. A typical
1875
1562
1250
1125
1000
875
750
625
563
500
438
375
313
250
188
125
(1)
SET
Typical Application
11
P
=
P
Input Capacitor
To limit the voltage drop on the input supply caused by
transient inrush currents when the switch is turned on
into a discharged load capacitor or a short-circuit, a
capacitor needs to be placed between V
0.1µF ceramic capacitor, C
usually sufficient. Higher values of C
further reduce the voltage drop.
Output Capacitor
A 0.1µF capacitor, C
V
inductances from forcing V
switch turns off. For the FPF2193 and FPF2194, the
total output capacitance needs to be kept below a
maximum value, C
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 depends upon the level at which the current
limit is set. The maximum allowed setting for the current
limit is 1.5A and results in a power dissipation of
If the part goes into current limit, the maximum power
dissipation occurs when the output is shorted to ground.
For the FPF2193, the power dissipation scales by the
auto-restart time, t
time, t
(max)
C
OUT
30
=
OUT
I (
+
30
and GND. This capacitor prevents parasitic board
LIM
BLANK
(max)
450
=
)
2
t
, so that the maximum power dissipated is:
BLANK
×
×
R
5
=
ON
5 .
t
BLANK
I
LIM
×
+
=
RSTRT
1
OUT
t
(max)
5 .
(
RSTRT
. 1
OUT
(max), to prevent the part from
=
) 5
, and the over-current blanking
515
2
, should be placed between
×
V
IN
×
×
t
IN
, placed close to the pins is
OUT
. 0
BLANK
V
6 .
IN
055
mW
(max)
below GND when the
(min)
=
IN
123
×
can be used to
I
IN
LIM
.
75
and GND. A
www.fairchildsemi.com
(max)
mW
:
(2)
(3)
(4)