FPF2110 [FAIRCHILD]
IntelliMAX Advanced Load Management Products; 的IntelliMAX先进负载管理产品
| 型号： | FPF2110 |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | IntelliMAX Advanced Load Management Products |
| 文件： | 总12页 (文件大小：423K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
May 2005
FPF2108-FPF2110
IntelliMAX™ Advanced Load Management Products
Features
General Description
¢ 1.8 to 5.5V Input Voltage Range
The FPF2108-FPF2110 is a series of load switches which
provides full protection to systems and loads which may
encounter large current conditions. This devices contain a
0.125Ω current-limited P-channel MOSFET which can operate
over an input voltage range of 1.8-5.5V. Internally, reverse
¢ Controlled Turn-On
¢ 200mA and 400mA Current Limit Options
¢ Undervoltage Lockout
¢ Thermal Shutdown
current blocking prevents current
MOSFET is off and the output voltage is higher than the input
voltage. Switch control is by a logic input (ON) capable of
from flowing when the
¢ <2uA Shutdown Current
¢ Fast Current limit Response Time
¢ 3us to Moderate Over Currents
¢ 20ns to Hard Shorts
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.
¢ Reverse Current Blocking
¢ Fault Blanking
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 FPF2108, if the
constant current condition still persists after 10ms, the part will
shut off the switch and pull the fault signal pin (FLAGB) low. The
switch will remain off until the ON pin is cycled. For the
Applications
¢ PDAs
¢ Cell Phones
¢ GPS Devices
¢ MP3 Players
¢ Digital Cameras
¢ Peripheral Ports
¢ Hot Swap Supplies
FPF2109 and FPF2110,
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
FPF2109 while that for the FPF2108 and FPF2110 is 400mA.
These parts are available in a space-saving 5 pin SOT23
package.
Typical Application Circuit
TO LOAD
V
V
OUT
IN
FPF2108 - FPF2110
OFF ON
ON
FLAGB
GND
©2005 Fairchild Semiconductor Corporation
FPF2108-FPF2110 Rev. B
1
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Functional Block Diagram
V
IN
UVLO
REVERSE
CURRENT
BLOCKING
CONTROL
LOGIC
ON
CURRENT
LIMIT
V
OUT
THERMAL
SHUTDOWN
FLAGB
GND
Pin Configuration
V
5
4
V
1
IN
GND
ON
OUT
2
3
FLAGB
SOT23-5
Pin Description
Pin
Name
Function
1
2
3
4
V
IN
Supply Input: Input to the power switch and the supply voltage for the IC
GND
ON
Ground
ON Control Input
FLAGB
Fault Output: Active LO, open drain output which indicates an over current supply,
under voltage or over temperature state.
5
V
Switch Output: Output of the power switch
OUT
2
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FPF2108-FPF2110 Rev. B
Absolute Maximum Ratings
Parameter
Min.
Max.
6
Unit
V
V
, V
, ON, FLAGB to GND
-0.3
IN
OUT
Power Dissipation @ T = 25°C (note 1)
667
125
150
150
mW
°C
A
Operating Temperature Range
Storage Temperature
-40
-65
°C
Thermal Resistance, Junction to Ambient
Electrostatic Discharge Protection
°C/W
V
HBM
MM
4000
400
V
Recommended Operating Range
Parameter
Min.
1.8
Max.
5.5
Unit
V
V
IN
Ambient Operating Temperature, T
-40
85
°C
A
Electrical Characteristics
V
=1.8to5.5V,T =-40to+85°Cunlessotherwisenoted. TypicalvaluesareatV =3.3VandT =25°C.
A IN A
IN
Parameter
Symbol
Conditions
Min.
Typ.
Max Units
Basic Operation
Operating Voltage
Quiescent Current
V
1.8
5.5
V
IN
I
I
= 0mA
V
V
= 1.8 to 3.3V
= 3.3 to 5.5V
95
ꢀA
Q
OUT
IN
Von active
110
200
2
IN
Shutdown Current
I
I
I
ꢀA
ꢀA
SHDN
Reverse Block Leakage Current
Latch-Off Current (note 2)
On-Resistance
1
BLOCK
V
= V , after an overcurrent fault
50
ꢀA
LATCHOFF
ON
IN
R
T = 25°C, I = 50mA
OUT
125
150
160
mꢀ
ON
A
T = -40 to +85°C, I
= 50mA
A
OUT
ON Input Logic High Voltage
ON Input Logic Low Voltage
V
V
V
V
V
V
V
V
V
V
= 1.8V
= 5.5V
= 1.8V
= 5.5V
0.75
1.30
V
V
IH
IN
IN
V
0.5
1.0
1
IL
IN
IN
ON Input Leakage
= V or GND
ꢀA
ꢀA
V
ON
ON
IN
Off Switch Leakage
I
I
= 0V, V
= 0V
1
SWOFF
OUT
FLAGB Output Logic Low Voltage
= 5V, I
= 10mA
SINK
0.1
0.2
0.3
1
IN
IN
IN
= 1.8V, I
= 10mA
0.15
SINK
FLAGB Output High Leakage Current
Protections
= 5V, Switch on
ꢀA
Current Limit
V
V
= 3.3V,
= 3.0V
FPF2109
200
400
300
600
400
800
mA
LIM
IN
OUT
FPF2108,
FPF2110
Thermal Shutdown
Shutdown Threshold
Return from Shutdown
Hysteresis
140
130
10
°C
Under Voltage Shutdown
UVLO
V
Increasing
1.5
1.6
47
1.7
V
IN
Under Voltage Shutdown Hysteresis
mV
3
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FPF2108-FPF2110 Rev. B
Electrical Characteristics Cont.
V
= 1.8 to 5.5V, T = -40 to +85°C unless otherwise noted. Typical values are at V = 3.3V and T = 25°C.
IN
A
IN
A
Parameter
Symbol
Conditions
Min.
Typ.
Max Units
Dynamic
Turn on time
Turn off time
t
t
t
t
t
RL=500ꢁ, CL=0.1uF
25
50
12
136
10
3
ꢀs
ꢀs
ꢀs
ꢀs
ON
OFF
R
RL=500ꢁ, CL=0.1uF
RL=500ꢁ, CL=0.1uF
RL=500ꢁ, CL=0.1uF
FPF2108
V
V
Rise Time
Fall Time
OUT
OUT
F
Over Current Blanking Time
Short Circuit Response Time
5
20
ms
BLANK
V
= V = 3.3V. Moderate
ꢀs
IN
ON
Over-Current Condition.
V
= V = 3.3V. Hard Short.
20
ns
IN
ON
Note 1: Package power dissipation on 1square inch pad, 2 oz copper board.
Note 2: Applicable only to FPF2108. Latchoff current does not include current flowing into FLAGB.
4
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FPF2108-FPF2110 Rev. B
Typical Characteristics
120
150
130
110
90
VON = V
IN
110
100
90
VIN = 5.5V
VIN = 3.3V
80
VIN = 1.8V
70
70
50
60
-40
-15
TJ, JUNCTION TEMPERATURE (oC)
Figure 2. Quiescent Current vs. Temperature
10
35
60
85
85
85
1.5
2
2.5
3
3.5
SUPPLY VOLTAGE (V)
Figure 1. Quiescent Current vs. Input Voltage
4
4.5
5
5.5
6
2500
2000
1500
1000
500
0
I_SHDN
I_SWOFF
2000
1500
1000
500
0
VIN = 5.5V
VIN = 5.5V
VIN = 3.3V
VIN = 3.3V
-40
-15
10
35
60
-40
-15
10
35
60
85
TJ, JUNCTIONTEMPERATURE (oC)
TJ, JUNCTION TEMPERATURE (oC)
Figure 3. I
Current vs. Temperature
Figure 4. I
Current vs. Temperature
SHUTDOWN
SWITCH-OFF
0.20
0.18
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0.00
1.4
1.2
1
VIN = 5.5V
0.8
0.6
0.4
0.2
0
VIN = 3.3V
-40
-15
10
TJ, JUNCTION TEMPERATURE (oC)
Figure 6. Reverse Current vs. Temperature
35
60
1.5
2.0
2.5
3.0
SUPPLY VOLTAGE (V)
Figure 5. Reverse Current vs. V
3.5
4.0
4.5
5.0
5.5
6.0
OUT
5
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FPF2108-FPF2110 Rev. B
Typical Characteristics
700
700
600
500
400
300
200
100
600
FPF2108, FPF2110
FPF2108, FPF2110
500
400
300
FPF2109
FPF2109
200
100
0
-40
-15
10
35
60
85
0.3
0.6
0.9
1.2
1.5
1.8
2.1
2.4
2.7
3
V -VOUT (V)
IN
TJ, JUNCTION TEMPERATURE (oC)
Figure 7. Current Limit vs. Output Voltage
Figure 8. Current Limit vs. Temperature
200
1.4
1.2
1
180
160
140
120
100
80
FPF2109, FPF2110
VIN = 1.8V
FPF2108
0.8
0.6
0.4
0.2
0
VIN = 3.3V
VIN = 5.5V
60
-40
-15
10
TJ, JUNCTION TEMPERATURE (oC)
Figure 9. R vs. Temperature
35
60
85
1.5
2
2.5
3
3.5
4
4.5
5
5.5
V , INPUT VOLTAGE (V)
IN
Figure 10. V vs. V
(ON)
IH
IN
100
1000
ILOAD = 10mA
VCC = 3.3V
ILOAD = 10mA
VCC = 3.3V
T
(FALL)
TD
(OFF)
100
10
1
T
(RISE)
TD
(ON)
10
-40
-15
10
TJ, JUNCTION TEMPERATURE (oC)
Figure 11. T /T vs. Temperature
35
60
85
-40
-15
10
35
60
85
TJ, JUNCTION TEMPERATURE (oC)
Figure 12. T /T vs. Temperature
ON Off
RISE FALL
6
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FPF2108-FPF2110 Rev. B
Typical Characteristics
12
11
10
9
V
DRV
2V/DIV
V
OUT
8
2V/DIV
7
I
OUT
6
200mA/DIV
V
5
FLAGB
2V/DIV
4
-40
-15
10
35
60
85
TJ, JUNCTION TEMPERATURE (oC)
5mS/DIV
Figure 14. T Response
Figure 13. T
vs. Temperature
BLANK
BLANK
(V
signal forces the device to go into overcurrent condition.)
DRV
R = 500Ω, C = 0.1uF
R = 500Ω, C = 0.1uF
L
L
L
L
V
ON
V
ON
2V/DIV
2V/DIV
I
OUT
I
OUT
10mA/DIV
10mA/DIV
100uS/DIV
Figure 15. T Response
200nS/DIV
Figure 16. T Response
ON
OFF
V
= V
ON
IN
C
= 10uF
IN
V
IN
2V / DIV
C
= 0.1uF
OUT
V
/V
IN ON
2V/DIV
I
OUT
5A/DIV
I
OUT
200mA/DIV
V
OUT
2V/DIV
20uS/DIV
50uS/DIV
Figure 17. Short Circuit Response Time
(Output Shorted to GND)
Figure 18. Current Limit Response
(Switch power up to hard short)
7
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FPF2108-FPF2110 Rev. B
Typical Characteristics
V
IN
2V/DIV
V
ON
2V/DIV
I
OUT
200mA/DIV
50uS/DIV
Figure 19. Current Limit Response Time
(OutputShortedtoGNDby10Ω,moderateshort)
8
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FPF2108-FPF2110 Rev. B
limit condition FLAGB is activated. These parts will remain in a
constant current state until the ON pin is deactivated or the
thermal shutdown turns-off the switch.
Description of Operation
The FPF2108-FPF2110 is a current limited switch that protects
systems and loads which can be damaged or disrupted by the
application of high currents. The core of the device is a 0.125Ω
P-channel MOSFET and a controller capable of functioning over
a wide input operating range of 1.8-5.5V. The controller
protects against system malfunctions through current limiting,
under-voltage lockout and thermal shutdown. The current limit
is preset for either 200mA or 400mA.
Under-Voltage Lockout
The under-voltage lockout turns-off the switch if the input
voltage drops below the under-voltage lockout threshold. With
the ON pin active the input voltage rising above the
under-voltage lockout threshold will cause a controlled turn on
of the switch which limits current over-shoots.
On/OffControl
Thermal Shutdown
The ON pin controls the state of the switch. Active HI and LO
versions are available. Refer to the Ordering Information for
details. Activating ON continuously holds the switch in the on
state so long as there is no fault. For all versions, an
The thermal shutdown protects the part from internally or
externally generated excessive temperatures.
During an
over-temperature condition the FLAGB is activated and the
switch is turned-off. The switch automatically turns-on again if
the temperature of the die drops below the threshold
temperature.
under-voltage on V or a junction temperature in excess of
IN
150°C overrides the ON control to turn off the switch. For
FPF2108, the ON pin must be toggled to turn on the switch
again. The FPF2109 and FPF2110 do not turn off in response
to a over current condition but instead remain operating in a
constant current mode so long as ON is active and the thermal
shutdown or under-voltage lockout have not activated. When
the MOSFET is off, the body diode is disabled so no current
can flow through it.
Fault Reporting
Upon the detection of an over-current, an input under-voltage,
or an over-temperature condition, the FLAGB signals the fault
mode by activating LO. For the FPF2108, the FLAGB goes LO
at the end of the blanking time while FLAGB goes LO immedi-
ately for the FPF2109 and FPF2110. For the FPF2108, FLAGB
is latched LO and ON must be toggled to release it.With the
FPF2109 and FPF2110, FLAGB is LO during the faults and
immediately returns HI at the end of the fault condition. FLAGB
is an
open-drain MOSFET which requires a pull-up resistor
between V and FLAGB. During shutdown, the pull-down on
IN
FLAGB is disabled to reduce current draw from the supply.
Current Limiting
The current limit ensures that the current through the switch
doesn't exceed a maximum value while not limiting at less than
a minimum value. For the FPF2109 the minimum current is
200mA and the maximum current is 400mA and for the
FPF2108 and FPF2110 the minimum current is 400mA and the
maximum current is 800mA. The FPF2108 has a blanking time
of 10ms, nominally, during which the switch will act as a con-
stant current source. At the end of the blanking time, the switch
will be turned-off and the FLAGB pin will activate to indicate that
current limiting has occurred. The FPF2109 and FPF2110 have
no current limit blanking period so immediately upon a current
Ordering Information
Current Limit
Auto-Restart
Current Limit
[mA]
Blanking Time
[ms]
Time
[ms]
ON Pin
Activity
Part
Top Mark
2108
FPF2108
FPF2109
FPF2110
400
200
400
10
0
NA
NA
NA
Active LO
Active HI
Active HI
2109
0
2110
9
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FPF2108-FPF2110 Rev. B
Application Information
Typical Application
LOAD
V
V
OUT
IN
R1 = 100KΩ
C2 = 0.1µF
FPF2108 - FPF2110
Battery
1.8V-5.5V
R2 = 499Ω
OFF ON
C1 = 10µF
ON
FLAGB
GND
Input Capacitor
To limit the voltage drop on the input supply caused by transient
in-rush currents when the switch turns-on into a discharged load
capacitor or a short-circuit, a capacitor needs to be placed
between V and GND. A 0.1uF ceramic capacitor, C , placed
IN
IN
close to the pins is usually sufficient. Higher values of C can
IN
be used to further reduce the voltage drop.
Output Capacitor
A 0.1uF capacitor C
, should be placed between V
and
OUT
OUT
GND. This capacitor will prevent parasitic board inductances
from forcing V below GND when the switch turns-off.
OUT
Power Dissipation
During normal operation as a switch, the power dissipation is
small and has little effect on the operating temperature of the
part. The parts with the higher current limits will dissipate the
most power and that will only typically be,
P = (ILIM)2 ∗RDS = (0.8)2 ∗0.125 = 80mW
When in current limit the maximum power dissipation will occur
when the output is shorted to ground. A short on the output will
cause the part to operate in a constant current state until the
thermal shutdown activates. It will then 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 V , V
and GND will help
IN
OUT
minimize parasitic electrical effects along with minimizing the
case to ambient thermal impedance.
10
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FPF2108-FPF2110 Rev. B
Dimensional Outline and Pad Layout
11
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FPF2108-FPF2110 Rev. B
12
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FPF2108-FPF2110 Rev. B
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