DataSheet.es FPF2223 Hoja de datos PDF


PDF FPF2223 Datasheet ( Hoja de datos )

Número de pieza FPF2223
Descripción Integrated Load Switch
Fabricantes Fairchild Semiconductor 
Logotipo Fairchild Semiconductor Logotipo
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Total 14 Páginas
		
FPF2223 datasheet

1 Page

FPF2223 pdf
Typical Characteristics
80
VON = VIN
70
60
50
40
30
20
10
1
2
85oC
25oC
-40oC
34
SUPPLY VOLTAGE (V)
5
Figure 1. Quiescent Current vs. Input Voltage
6
90
VON=VIN
80
70
60
50
40
30
20
-40
VIN=5.5V
VIN=3.3V
VIN=1.8V
-15 10 35
TJ, JUNCTION TEMPERATURE (oC)
60
Figure 2. Quiescent Current vs. Temperature
85
1.4
1.2
1.0
0.8
0.6
0.4
0.2
1
VIH
VIL
2345
VIN, SUPPLY VOLTAGE (V)
Figure 3. VON vs. Input Voltage
6
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
-40
VIN=5.5V
VIN=3.3V
VIN=1.2V
-15 10 35 60
TJ, JUNCTION TEMPERATURE (oC)
Figure 4. VON High Voltage vs. Temperature
85
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
-40
VIN=5.5V
VIN=3.3V
VIN=1.2V
-15 10 35
TJ, JUNCTION TEMPERATURE (oC)
60
Figure 5. VON Low Voltage vs. Temperature
85
0.05
0.04
0.03
0.02
0.01
VON = 5.5V
0.00
-0.01
-40
VON = 0V
-15 10 35
TJ, JUNCTION TEMPERATURE (oC)
60
85
Figure 6. On Pin Current vs. Temperature
FPF2223-FPF2225 Rev. C
5
www.fairchildsemi.com

5 Page

FPF2223 arduino
Application Information
Setting Current Limit
The FPF2223, FPF2224, and FPF2225 have adjustable high
precision current limit which is set with an external resistor
connected between ISET and GND. Please see the layout
recommendation section of the application note for the
recommended RSET layout. The RSET resistance is selected by
using the following equation:
ILIM (Typ) (mA) =
23764
RSET (K )
For a particular ILIM(min) value, RSET can be calculated from
below formula:
RSET (K ) =
23764
ILIM (Min) (mA) + 25 +
4700
ILIM (Min) (mA)
FPF222X family has 5% precision at higher load current. The
ILIM (Max) and tolerance of current limit value can be determined
using Figure 23 (ILIM vs RSET ) and the following formula:
Tolerance (%) = 100 *
ILIM (Typ) - ILIM (Min)
ILIM (Typ)
ILIM (Max) =
ILIM (Typ) +
ILIM (Typ) * Tolerance (%)
100
The table and figure below can be used to select RSET:
RSET Min. Current Typ. Current Max. Current
[k ] Limit [mA] Limit [mA] Limit [mA]
Tol
[%]
36.0 627.0
660.0
693.0
5.0
37.5 600.9
633.7
666.5
5.2
39.0 576.2
609.3
642.5
5.4
40.2 557.7
591.1
624.5
5.7
42.2 529.3
563.1
597.0
6.0
44.2 503.3
537.6
572.0
6.4
49.0 449.5
485.0
520.4
7.3
51.1 429.1
465.0
501.0
7.7
54.9 396.0
432.9
469.7
8.5
61.9 345.3
383.9
422.5
10.1
69.8 299.8
340.5
381.1
11.9
80.9 250.0
293.7
337.5
14.9
Table 1: RSET Selection Guide
720
660
600
540
480
420
360
300
240
34
42 50 58 66
RSET (KOhms)
Figure 23. ILIM vs RSET
Max
Typ
Min
74 82
Input Capacitor
To limit the voltage drop on the input supply caused by transient
in-rush currents when the switch is turned on into a discharged
load capacitor or a short-circuit, a capacitor is recommended to
be placed between VIN and GND. A 1uF ceramic capacitor, CIN,
placed close to the pins is usually sufficient. Higher values of
CIN can be used to further reduce the voltage drop.
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
FPF2223 and FPF2224, 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) =
ILIM (Max) * tBLANK (Min)
VIN
Power Dissipation
During normal on-state operation, the power dissipated in the
device will depend upon the level at which the current limit is
set. The maximum allowed setting for the current limit is 625mA
and will result in a power dissipation of:
P = (ILIM)2 * RDS = (0.625)2 * 0.165 = 64mW
If the part goes into current limit, maximum power dissipation
will occur when the output is shorted to ground. For the
FPF2223, the power dissipation will be scaled by the Auto-
Restart Time, tRSTRT, and the Over Current Blanking Time,
tBLANK. Therefore, the maximum power dissipated is:
P (Max) =
tBLANK
tBLANK + tRSTRT
* VIN (Max) * ILIM (Max)
30
= 30 + 450 * 5.5 * 0.693 = 0.238W
FPF2223-FPF2225 Rev. C
10
www.fairchildsemi.com

10 Page





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