FPF2146 Fairchild Semiconductor, FPF2146 Datasheet - Page 11

• Manufacturer Part Number: FPF2146
• Description: IC LOAD SWITCH REV CURR BK 6-MLP
• Manufacturer: Fairchild Semiconductor
• Type: High Side Switchr

Specifications of FPF2146

• Number Of Outputs: 1
• Rds (on): 160 mOhm
• Internal Switch(s): Yes
• Current Limit: 400mA
• Voltage - Input: 1.8 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 6-MLP
• Input Voltage: 1.8 to 5.5V
• Power Switch On Resistance: 120mOhm
• Output Current: 400mA
• Mounting: Surface Mount
• Package Type: MLP EP
• 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: FPF2146TR

FPF2140/42/43/44/46/47 Rev. D
Application Notes
Power Good
FPF214X family has a "Power Good" feature. PGOOD pin is an
open-drain MOSFET which asserts high when the output
voltage reaches 90% of the input voltage.
PGOOD pin requires an external pull up resistor that is
connected to the output voltage when there is no battery in the
load side and the logic level of the subsequent controller
permits. This would give logic levels similar to a CMOS output
stage for PGOOD, while still keeping the option to tie the pull-up
to a different supply voltage. A typical value of 100KΩ is
recommended to be used as pull up resistor. The PGOOD pin
status is independent of the ON pin position. This mean that
PGOOD pin stays low when the load switch is OFF. If the Power
Good feature is not used in the application the pin can be
connected directly to GND.
V
V
IN1
IN2
Power good function in sequential startup. No battery is loaded to the output
TP
OFF ON
100KΩ
100KΩ
Startup Power Sequence
ON
V
ON
PGOOD
V
PGOOD
IN1
IN2
FPF2140/2/
FPF2140/2/
11
3/4/6/7
3/4/6/7
GND
GND
Sequential Startup using Power Good
The power good pin can be connected to another load switch's
enable pin to implement sequential startup. PGOOD pin asserts
low when the load switch is OFF. This feature allows driving a
subsequent circuit. The above diagram illustrates power good
function in sequential startup. As the V
switch starts to ramp to the 90% of its input voltage the second
switch remains in OFF state. Whereas the V
90% threshold, power good signal becomes active and asserts
high. This signal will turn on the second load switch and V
will start to increase. The total startup time may vary according
to the difference between supply voltages that are used in the
application.
FLAGB
FLAGB
V
V
OUT1
OUT2
OUT1
To Load
OUT1
To Load
of the first load
www.fairchildsemi.com
passes the
OUT2