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PDF FPF2195 Data sheet ( Hoja de datos )
| Número de pieza | FPF2195 | |
| Descripción | Full-Function Load Switch | |
| Fabricantes | Fairchild Semiconductor | |
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September 2014
FPF2193 / FPF2194 / FPF2195
Full-Function Load Switch with Adjustable Current Limit
Features
<1.8 to 5.5 V Input Voltage Range
Controlled Turn-On
0.1 to 1.5 A Adjustable Current Limit
Under-Voltage Lockout
Thermal Shutdown
<2 µA Shutdown Current
Auto Restart
Fast Current Limit Response Time
5 µs to Moderate Over Currents
30 ns to Hard Shorts
Fault Blanking
Reverse Current Blocking
Applications
PDAs
Cell Phones
Handheld GPS Devices
Portable Enterprise / Industrial Devices
Digital Cameras
Peripheral Ports and Accessories
Portable Medical Equipment
Hot Swap Supplies
Description
The FPF2193, FPF2194, and FPF2195 form a series of
load switches that provides full protection to systems
and loads that may encounter large current conditions.
These devices contain a 55 mΩ current-limited P-
channel MOSFET that can operate over an input
voltage range of 1.8 to 5.5 V. 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 that 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
FPF2193 and FPF2194, if the constant current condition
still persists after 30 ms, the parts shut off the switch
and pull the fault signal pin (FLAGB) LOW. The
FPF2193 has an auto-restart feature that turns the
switch on again after 450 ms if the ON pin is still active.
The FPF2194 does not have this auto-restart feature, so
the switch remains off until the ON pin is cycled. The
FPF2195 does not turn off after a current limit fault, but
remains in the constant-current mode indefinitely. The
minimum current limit can be set as low as 45 mA.
These parts are available in a space-saving six ball
advanced 0.98 x 1.48 mm WLCSP package.
Ordering Information
Part Number
Current
Limit [mA]
FPF2193
FPF2194
100-1500
FPF2195
FPF2195BUCX 45-1500
Current Limit Blanking
Time [ms]
15/30/60
15/30/60
0
0
Auto-Restart
Time [ms]
225/450/900
NA
NA
NA
ON Pin
Activity
Active HIGH
Top Mark
S6
S7
S9
SY
© 2009 Fairchild Semiconductor Corporation
FPF2193/4/5 • Rev. 1.0.9
www.fairchildsemi.com
1 page  
Electrical Characteristics
VIN = 1.8 to 5.5 V, TA = -40 to +85°C unless otherwise noted. Typical values are at VIN = 3.3 V and TA = 25°C.
Symbol
Parameter
Conditions
Min. Typ. Max. Units
Basic Operation
VIN Operating Voltage
IQ Quiescent Current
RON On Resistance
VIH
On Input Logic High Voltage
ON
VIL On Input Logic Low Voltage
IIN On Input Leakage
VIN_SD VIN Shutdown Current
VFLB_L
FLAGB Output Logic Low
Voltage
IFLB_H
FLAGB Output Logic High
Leakage Current
Reverse Block
ISDT VOUT Shutdown Current
Vbreakdown Reverse Breakdown Voltage
Protections
Current Limit
ILIM Current Limit for
FPF2195BUCX
ILIM(MIN) Minimum Current Limit
TSD Thermal Shutdown
VUVLO Under-Voltage Lockout
VUVLO_HYST
Under-Voltage Lockout
Hysteresis
Dynamic
tdON
tR
tON
tdOFF
tF
tOFF
tBLANK
tRSTRT
Delay On Time
VOUT Rise Time
Turn-On Time
Delay Off Time
VOUT Fall Time
Turn-Off Time
Over-Current Blanking Time
Auto-Restart
tSC Short-Circuit Response Time
VIN=1.8 V
IOUT=0 mA, VON=VIN VIN=3.3 V
VIN=5.5 V
TA=25°C, IOUT=200 mA
TA=-40 to 85°C, IOUT=200 mA
VIN=1.8 V
VIN=5.5 V
VIN=1.8 V
VIN=5.5 V
VON=VIN or GND
VON=0 V, VIN=5.5 V,
VOUT=Short to GND
VIN=5 V, ISINK=10 mA
VIN=1.8 V, ISINK=10 mA
VIN=5 V, Switch ON
VON=0 V, VOUT=5.5 V,
VIN=Short-to-GND
VIN=VON=0 V, IOUT=200 µA
VIN=3.3 V, VOUT=3.0 V, RSET=690 Ω
VIN=4.5 V, VOUT=4.2 V,
RSET=15.8 KΩ
VIN=3.3 V, VOUT=3.0 V,
RSET=5516 Ω
Shutdown Threshold
Return from Shutdown
Hysteresis
VIN Increasing
RL=500 Ω, CL=0.1 µF
RL=500 Ω, CL=0.1 µF
RL=500 Ω, CL=0.1 µF
RL=500 Ω, CL=0.1 µF
RL=500 Ω, CL=0.1 µF
RL=500 Ω, CL=0.1 µF
FPF2193, FPF2194
FPF2193 Only
VIN=VOUT=3.3 V, Moderate Over-
Current Condition
VIN=VOUT=3.3 V, Hard Short
1.8
0.8
1.4
-1
-2
-2
600
35
1.55
15
225
70
75
80
55
0
0.05
0.12
9
800
45
100
140
130
10
1.65
50
20
20
40
15
110
125
30
450
5
30
5.5
80
135
0.5
1.0
1
2
0.20
0.30
1
2
1000
60
1.75
60
900
V
µA
mΩ
V
V
µA
µA
V
µA
µA
V
mA
mA
ma
°C
V
mV
µs
µs
µs
µs
µs
µs
ms
ms
µs
ns
© 2009 Fairchild Semiconductor Corporation
FPF2193/4/5 • Rev. 1.0.9
5
www.fairchildsemi.com
5 Page 
Application Information
Figure 28. Typical Application
Setting Current Limit
The FPF2193, FPF2194, and FPF2195 current limit is
set with an external resistor connected between ISET and
GND. This resistor is selected using the following
equation:
RSET
=
551.6
ILIM
RSET is in Ω and ISET is in Amps.
(1)
Table 1 can also be used to select RSET. A typical
application would be the 500 mA current required by a
single USB port. Using Table 1, an appropriate selection
for the RSET resistor would be 788 Ω. This ensures that
the port load could draw 525 mA, but not more than
875 mA. Likewise for a dual-port system; an RSET of
368 Ω always delivers at least 1125 mA and never more
than 1875 mA.
Table 1. Current Limit Various RSET Values
RSET(Ω)
Min. Current
Limit (mA)
368 1125
441 928
552 750
613 675
690 600
788 525
919 450
1103
375
1226
338
1379
300
1576
263
1839
225
2206
188
2758
150
3677
113
5516
15800(4)
75
35
Typ. Current
Limit (mA)
1500
1250
1000
900
800
700
600
500
450
400
350
300
250
200
150
100
45
Max. Current
Limit (mA)
1875
1562
1250
1125
1000
875
750
625
563
500
438
375
313
250
188
125
60
Input Capacitor
To limit the voltage drop on the input supply caused by
transient inrush currents when the switch is turned on
into a discharged load capacitor or a short-circuit, a
capacitor needs to be placed between VIN and GND. A
0.1 µF 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 0.1 µF capacitor, COUT, should be placed between
VOUT and GND. This capacitor prevents parasitic board
inductances from forcing VOUT below GND when the
switch turns off. For the FPF2193 and FPF2194, 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
(2)
Power Dissipation
During normal operation as a switch, the power
dissipated depends upon the level at which the current
limit is set. The maximum allowed setting for the current
limit is 1.5 A and results in a power dissipation of:
P = (ILIM)2 ×RON = (1.5)2 × 0.055 = 123.75mW (3)
If the part goes into current limit, the maximum power
dissipation occurs when the output is shorted to ground.
For the FPF2193, the power dissipation scales by the
auto-restart time, tRSTRT, and the over-current blanking
time, tBLANK, so that the maximum power dissipated is:
P(max) =
tBLANK
tBLANK + tRSTRT
× VIN(max)×ILIM(max)
=
30
30 + 450
× 5.5 ×1.5
=
515.6mW
(4)
Note:
4. FPF2195BUCX only.
© 2009 Fairchild Semiconductor Corporation
FPF2193/4/5 • Rev. 1.0.9
11
www.fairchildsemi.com
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet FPF2195.PDF ] | |
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