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PDF FPF2502 Data sheet ( Hoja de datos )

Número de pieza FPF2502
Descripción (FPF2500 - FPF2506) Advanced Load Management Products
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo



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No Preview Available ! FPF2502 Hoja de datos, Descripción, Manual

February 2007
FPF2500-FPF2506
IntelliMAX™ Advanced Load Management Products
tm
Features
„ 4.5 to 20V Input Voltage Range
„ Controlled Turn-On
„ 0.4A, 0.8A and Adjustable Current Limit Option
„ Undervoltage Lockout
„ Thermal Shutdown
„ <10uA Shutdown Current
„ Auto Restart
„ Fault Blanking
Applications
„ PDAs
„ Motor Drivers
„ Cell Phones
„ Digital Cameras
„ RoHS Compliant
General Description
The FPF2500 through FPF2506 is a family of load switches
which provide full protection to systems and loads which may
encounter large current conditions. These devices contain a
0.23current-limited N-channel MOSFET which can operate
over an input voltage range of 4.5-20V. 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 FPF2500, FPF2501,
FPF2503 and FPF2505, if the constant current condition still
persists after 5ms, these parts will shut off the switch and, for
the FPF2503 and FPF2505, the fault signal pin (FLAGB) will be
pulled low. The FPF2500, FPF2503, and FPF2505, have an
auto-restart feature which will turn the switch on again after
640ms if the ON pin is still active. The FPF2501 does not have
this auto-restart feature so the switch will remain off until the ON
pin is cycled. For the FPF2502, FPF2504 and FPF2506, 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. For the FPF2500
through FPF2502, the minimum current limit is adjustable from
500mA to 2A. For the FPF2503 and FPF2504 the minimum
current is internally fixed at 400mA while that for the FPF2505
and FPF2506 is internally fixed at 800mA.
These parts are available in a space-saving 5 pin SOT23
package.
Ordering Information
Part
FPF2500
FPF2501
FPF2502
FPF2503
FPF2504
FPF2505
FPF2506
Current Limit [A]
Adjustable (0.5-2.0 +/-30%)
Adjustable (0.5-2.0 +/-30%)
Adjustable (0.5-2.0 +/-30%)
0.4/0.6/0.8
0.4/0.6/0.8
0.8/1.2/1.6
0.8/1.2/1.6
Current Limit
Blanking Time
[ms]
2.5/5/10
2.5/5/10
0
2.5/5/10
0
2.5/5/10
0
Auto-Restart
Time
[ms]
320/640/1280
NA
NA
320/640/1280
NA
320/640/1280
NA
Fault Pin
No
No
No
Yes
Yes
Yes
Yes
©2007 Fairchild Semiconductor Corporation
FPF2500-FPF2506 Rev. D4
1
www.fairchildsemi.com

1 page




FPF2502 pdf
Typical Characteristics
80
VON = 5V
75
70
65
60
55
50
4 6 8 10 12 14 16 18 20
SUPPLY VOLTAGE (V)
Figure 1. Quiescent Current vs. Input Voltage
80
75
VIN = 20V
70
65
60 VIN = 12V
55
50 VIN = 4.5V
45
40
-40
-15 10 35 60
TJ, JUNCTION TEMPERATURE (oC)
Figure 2. Quiescent Current vs. Temperature
85
8.0
I_SHDN
7.5
7.0 VIN = 20V
6.5
6.0
5.5
5.0 VIN = 12V
4.5
4.0
-40 -15 10 35 60
TJ, JUNCTION TEMPERATURE (oC)
Figure 3. ISHUTDOWN Current vs. Temperature
85
0.036
I_SWOFF
0.032
0.028
0.024
0.02
VIN = 20V
VIN = 12V
0.016
-40 -15 10 35 60
TJ, JUNCTION TEMPERATURE (oC)
Figure 4. ISWITCH-OFF Current vs. Temperature
85
0.80
0.75
0.70
320
VIN = 12V
300
280
260
0.65
240
0.60
0.55
220
200
180
0.50
160
4 6 8 10 12 14 16 18 20
-40
VIN, Input Voltage (V)
Figure 5. VIH vs. VIN
-15 10 35 60
TJ, JUNCTION TEMPERATURE (oC)
Figure 6. R(ON) vs. Temperature
85
FPF2500-FPF2506 Rev. D4
5
www.fairchildsemi.com

5 Page





FPF2502 arduino
Output Capacitor
A 0.1uF capacitor COUT, should be placed between VOUT and
GND. This capacitor will prevent parasitic board inductances
from forcing VOUT below GND when the switch turns-off. For the
FPF2501, FPF2503 and FPF2505, the total output capacitance
needs to be kept below a maximum value, COUT(max), to prevent
the part from registering an over-current condition and turning
off the switch. The maximum output capacitance can be
determined from the following formula,
COUT(max) = I--L---I--M----(---m-----i--n---)----×-V----tI--BN---L---A----N---K----(--m------i-n----)
Power Dissipation
(2)
Due to the wide input voltage range that the parts can accept
and the high currents at which the current limit can be set, care
must be taken to prevent excessive power dissipation in the part
from interrupting the switching of power to a load. During normal
operation as a switch, the power dissipated in the part will
depend upon the level at which the current limit is set. For a
0.5A typical load, the power dissipated will typically be,
P = (ILIM)2 × RDS = (0.5)2 × 0.23 = 58mW
(3)
This is well within the thermal capability of the package. The
maximum allowed setting for the current limit is 2A and this will
result in a power dissipation of typically,
P = (ILIM)2 × RDS = (2)2 × 0.23 = 920mW
(4)
This is beyond the normal thermal capability of the package, but
the thermal shutdown within the part will prevent damage by
turning off the switch once the maximum junction temperature
has been reached. If the part goes into current limit the
maximum power dissipation will occur when the output is
shorted to ground. For the FPF2500, FPF2503 and FPF2505
the power dissipation will scale by the Auto-Restart Time,
tRESTART, and the Over Current Blanking Time, tBLANK, so that
the maximum power dissipated is,
P(max) = -t-R----E----S---T---A-t--B-R--L-T--A---+N----K-t--B---L---A----N---K-- × VIN(max) × ILIM(max)
= 5-----+----5-6----4---0-- × 20 × 2.5= 388mW
(5)
This is more power than the package can dissipate, but the
thermal shutdown of the part will activate to protect the part
from damage due to excessive heating. The junction
temperature will only be able to increase to the thermal
shutdown threshold. Once this temperature has been reached,
toggling ON will not turn-on the switch until the junction
temperature drops. For the FPF2502, FPF2504 and FPF2506,
a short on the output will cause the part to operate in a constant
current state dissipating a worst case power of,
P(max) = VIN(max) × ILIM(max) = 20 × 2.5 = 50W (6)
This large amount of power will activate the thermal shutdown
and the part will cycle in and out of thermal shutdown so long as
the ON pin is active and the short is present.
Board Layout
For best performance, all traces should be as short as possible.
To be most effective, the input and output capacitors should be
placed close to the device to minimize the effects that parasitic
trace inductances may have on normal and short-circuit
operation. Using wide traces for VIN, VOUT and GND will help
minimize parasitic electrical effects along with minimizing the
case to ambient thermal impedance.
FPF2500-FPF2506 Rev. D4
11
www.fairchildsemi.com

11 Page







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