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PDF FPF2125 Data sheet ( Hoja de datos )
| Número de pieza | FPF2125 | |
| Descripción | (FPF2123 - FPF2125) IntelliMAX Advanced Load Management Products | |
| Fabricantes | Fairchild Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de FPF2125 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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www.DataSheet4U.com
August 2005
FPF2123-FPF2125
IntelliMAX™ Advanced Load Management Products
Features
1.8 to 5.5V Input Voltage Range
Controlled Turn-On
0.15-1.5A Adjustable Current Limit
Undervoltage Lockout
Thermal Shutdown
<2uA Shutdown Current
Auto Restart
Fast Current limit Response Time
3us to Moderate Over Currents
20ns to Hard Shorts
Fault Blanking
Reverse Current Blocking
Applications
PDAs
Cell Phones
GPS Devices
MP3 Players
Digital Cameras
Peripheral Ports
Hot Swap Supplies
Typical Application Circuit
General Description
The FPF2123, FPF2124, and FPF2125 are a series of load
switches which provides full protection to systems and loads
which may encounter large current conditions. These devices
contain a 0.125Ω current-limited P-channel MOSFET which can
operate over an input voltage range of 1.8-5.5V. The current
limit is settable using an external resistor. 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 parts
operate in a constant-current mode to prohibit excessive
currents from causing damage. For the FPF2123 and FPF2124
if the constant current condition still persists after 10ms, these
parts will shut off the switch. The FPF2123 has an auto-restart
feature which will turn the switch on again after 160ms if the ON
pin is still active. The FPF2124 does not have this auto-restart
feature so the switch will remain off after a current limit fault until
the ON pin is cycled. The FPF2125 will not turn off after a
current limit fault, but will rather remain in the constant current
mode indefinitely. The minimum current limit is 150mA.
These parts are available in a space-saving 5 pin SOT23
package
OFF ON
VIN VOUT
FPF2123 - FPF2125
ON ISET
GND
TO LOAD
©2005 Fairchild Semiconductor Corporation
FPF2123-FPF2125 Rev. C
1
www.fairchildsemi.com
1 page  
Typical Characteristics
76
VON = VIN
74
72
70
68
66
64
62
1.5
2 2.5 3 3.5 4 4.5 5 5.5
SUPPLY VOLTAGE (V)
Figure 1. Quiescent Current vs. Input Voltage
6
95
85
75
VIN = 5.5V VIN = 3.3V
65 VIN = 1.8V
55
45
-40
-15 10 35 60
TJ, JUNCTION TEMPERATURE (oC)
Figure 2. Quiescent Current vs. Temperature
85
2500
I_SHDN
2000
1500
VIN = 5.5V
1000
500
VIN = 3.3V
0
-40 -15 10 35 60 85
TJ, JUNCTION TEMPERATURE (oC)
Figure 3. ISHUTDOWN Current vs. Temperature
500
450 I_SWOFF
400
350
300 VIN = 5.5V
250
200
150
100
50 VIN = 3.3V
0
-40 -15 10 35 60
TJ, JUNCTION TEMPERATURE (oC)
Figure 4. ISWITCH-OFF Current vs. Temperature
85
0.20
0.18
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0.00
1.5
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
SUPPLY VOLTAGE (V)
Figure 5. Reverse Current vs. VOUT
6.0
1.4
1.2
1
0.8
0.6
0.4
0.2
0
-40
VIN = 5.5V
VIN = 3.3V
-15 10 35 60 85
TJ, JUNCTION TEMPERATURE (oC)
Figure 6. Reverse Current vs. Temperature
FPF2123-FPF2125 Rev. C
5
www.fairchildsemi.com
5 Page 
P(max)=
t
t BLANK(max)
RESTART(min) + t BLANK(max)
∗
VIN
(max)∗
LLIM(max)
=
80
20
+
20
∗ 5 . 5 ∗ 1 . 5 = 1 . 65 W
(4)
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. When using the
FPF2124, attention must be given to the manual resetting of the
part. Continuously resetting the part when a short on the output
is present will cause the temperature of the part to increase.
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 FPF2125, a short on the
output will cause the part to operate in a constant current state
dissipating a worst case power of,
P(max) = V IN (max) ∗ I LIM (max)
= 5 . 5 ∗ 1.5 = 8 . 25 W
(5)
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.
FPF2123-FPF2125 Rev. C
11
www.fairchildsemi.com
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet FPF2125.PDF ] | |
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