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Número de pieza | FPF2144 | |
Descripción | Full Function Load Switch | |
Fabricantes | Fairchild Semiconductor | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de FPF2144 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
No Preview Available ! November 2008
FPF2140/42/43/44/46/47
Full Function Load Switch with Reverse Current Blockingtm
Features
1.8 to 5.5V Input Voltage Range
Controlled Turn-On
200mA and 400mA Current Limit Options
Undervoltage Lockout
Thermal Shutdown
<2µA Shutdown Current
Auto Restart
Fast Current limit Response Time
5µs to Moderate Over Currents
30ns to Hard Shorts
Fault Blanking
Reverse Current Blocking
Power Good Function
RoHS Compliant
Applications
PDAs
Cell Phones
GPS Devices
MP3 Players
Digital Cameras
Peripheral Ports
Hot Swap Supplies
General Description
The FPF2140/42/43/44/46/47 is a series of load switches which
provides full protection to systems and loads which may
encounter large current conditions. These devices contain a
0.12Ω current-limited P-channel MOSFET which can operate
over an input voltage range of 1.8-5.5V. Internally, current is
prevented from flowing when the MOSFET is off and the output
voltage is higher than the input voltage. Switch control is by a
logic input (ON) capable of interfacing directly with low voltage
control signals. Each part contains thermal shutdown protection
which shuts off the switch to prevent damage to the part when a
continuous over-current condition causes excessive heating.
When the switch current reaches the current limit, the part
operates in a constant-current mode to prohibit excessive
currents from causing damage. For the FPF2140/42/44/46, if
the constant current condition still persists after 30ms, the part
will shut off the switch and pull the fault signal pin (FLAGB) low.
The FPF2140/44 have an auto-restart feature which will turn the
switch on again after 450ms if the ON pin is still active. The
FPF2142/46 do not have this auto-restart feature so the switch
will remain off until the ON pin is cycled. For the FPF2143/47, a
current limit condition will immediately pull the fault signal pin
low and the part will remain in the constant-current mode until
the switch current falls below the current limit. The minimum
current limit is 200mA for the FPF2140/42/43 while that for the
FPF2144/46/47 is 400mA.
These parts are available in a space-saving 6 pin 2X2 MLP
package.
BOTTOM
Ordering Information
Part
FPF2140
FPF2142
FPF2143
FPF2144
FPF2146
FPF2147
Current Limit
[mA]
200/300/400
200/300/400
200/300/400
400/600/800
400/600/800
400/600/800
Pin 1
Current Limit
Blanking Time
[ms]
15/30/60
15/30/60
0
15/30/60
15/30/60
0
TOP
Auto-Restart
Time
[ms]
225/450/900
NA
NA
225/450/900
NA
NA
©2008 Fairchild Semiconductor Corporation
FPF2140/42/43/44/46/47 Rev. I
1
ON Pin
Activity
Active HI
Active HI
Active HI
Active HI
Active HI
Active HI
www.fairchildsemi.com
1 page Typical Characteristics
90
85
80
75
70
65
60
1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
SUPPLY VOLTAGE (V)
Figure 1. Quiescent Current vs. Input Voltage
110
105
100
95
90
85
80
75
70
65
60
55
50
-40
VIN = 5.5V
VIN = 3.3V
VIN = 1.8V
-15 10 35 60
TJ, JUNCTION TEMPERATURE (°C)
85
Figure 2. Quiescent Current vs. Temperature
1.3
1.2
1.1
1
0.9
0.8
0.7
0.6
1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
SUPPLY VOLTAGE (V)
Figure 3. VON High Voltage vs. Input Voltage
1.2
1.1
1
0.9
0.8
0.7
0.6
0.5
1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
SUPPLY VOLTAGE (V)
Figure 4. VON Low Voltage vs. Input Voltage
200
190
180
170
160
150
140
130
120
110
100
90
80
1
234
VIN, SUPPLY VOLTAGE (V)
Figure 5. RON vs. VIN
5
240
220
200
180
160
140
120
100
80
60
6 -40
VIN= 1.8V
VIN= 3.3V
VIN= 5.5V
-15 10 35 60
TJ, JUNCTION TEMPERATURE (°C)
Figure 6. RON vs. Temperature
85
FPF2140/42/43/44/46/47 Rev. I
5
www.fairchildsemi.com
5 Page Application Notes
Startup Power Sequence
VIN1 FPF2140/2/ VOUT1
3/4/6/7
VIN1
PGOOD
FLAGB
OFF ON ON GND
100KΩ
To Load
VIN2 FPF2140/2/ VOUT2
3/4/6/7
VIN2
PGOOD
FLAGB
ON GND
100KΩ
TP
To Load
Power good function in sequential startup. No battery is loaded to the output
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.
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 VOUT1 of the first load
switch starts to ramp to the 90% of its input voltage the second
switch remains in OFF state. Whereas the VOUT1 passes the
90% threshold, power good signal becomes active and asserts
high. This signal will turn on the second load switch and VOUT2
will start to increase. The total startup time may vary according
to the difference between supply voltages that are used in the
application.
FPF2140/42/43/44/46/47 Rev. I
11
www.fairchildsemi.com
11 Page |
Páginas | Total 13 Páginas | |
PDF Descargar | [ Datasheet FPF2144.PDF ] |
Número de pieza | Descripción | Fabricantes |
FPF2140 | Full Function Load Switch | Fairchild Semiconductor |
FPF2142 | Full Function Load Switch | Fairchild Semiconductor |
FPF2143 | Full Function Load Switch | Fairchild Semiconductor |
FPF2144 | Full Function Load Switch | Fairchild Semiconductor |
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