FPF1108 Fairchild Semiconductor, FPF1108 Datasheet - Page 11

• Manufacturer Part Number: FPF1108
• Description: IC LOAD MGMT SWITCH P-CH 4-WLCSP
• Manufacturer: Fairchild Semiconductor
• Series: IntelliMax™r
• Type: High Side Switchr

Specifications of FPF1108

• Number Of Outputs: 1
• Rds (on): 55 mOhm
• Internal Switch(s): Yes
• Current Limit: 1.2A
• Voltage - Input: 1.2 V ~ 4 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 4-WLCSP
• On Resistance (max): 150 mOhms
• Supply Voltage (max): 4 V
• Supply Voltage (min): 1.2 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Maximum Power Dissipation: 1 W
• Mounting Style: SMD/SMT
• Number Of Switches: Single
• Off Time (max): 3.9 us
• On Time (max): 215 us
• Supply Current: 1 uA
• Switch Current (typ): 1 uA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

© 2009 Fairchild Semiconductor Corporation
FPF1107 / FPF1108 • Rev. 1.0.1
Application Information
Input Capacitor
The IntelliMAX
To reduce device inrush current effect, a 0.1µF ceramic
capacitor, C
higher value of C
voltage drop experienced as the switch is turned on into
a large capacitive load.
Output Capacitor
The IntelliMAX
capacitor. However, if parasitic board inductance forces
V
C
OUT
OUT
, should be placed between V
below GND when switching off, a 0.1µF capacitor,
IN
, is recommended close to the VIN pin. A
TM
TM
switch doesn’t require input capacitor.
IN
switch works without an output
can be used to further reduce the
OUT
and GND.
11
Fall Time
Device output fall time can be calculated based on RC
constant of external components as follows:
where t
C
The same equation works for a device with a pull-down
output resistor, then R
connected pull-down and external output resistor
combination, as follows:
where t
R
output capacitor.
Resistive Output Load
If resistive output load is missing, the IntelliMAX
switch
discharging
depends, in that case, mainly on external device leaks.
t
t
F
F
L
PD
=
is output capacitor.
=
=65Ω is output pull-down resistor, and C
R
R
R
L
L
L
F
F
×
×
+
without
is 90% to 10% fall time, R
C
is 90% to 10% fall time, R
R
R
L
PD
PD
×
output
2
×
2 .
C
pull-down
L
×
2
voltage.
2 .
L
is replaced by a parallel
output
Output
L
is output load and
L
resistor
is output load,
voltage
www.fairchildsemi.com
L
is
(2)
is the
(1)
drop
not
TM