FPF2125 [FAIRCHILD]
IntelliMAX Advanced Load Management Products; 的IntelliMAX先进负载管理产品
| 型号： | FPF2125 |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | IntelliMAX Advanced Load Management Products |
| 文件： | 总13页 (文件大小：447K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
August 2005
FPF2123-FPF2125
IntelliMAX™ Advanced Load Management Products
Features
General Description
1.8 to 5.5V Input Voltage Range
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.
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
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.
Reverse Current Blocking
Applications
PDAs
Cell Phones
GPS Devices
MP3 Players
Digital Cameras
Peripheral Ports
Hot Swap Supplies
These parts are available in a space-saving 5 pin SOT23
package
Typical Application Circuit
TO LOAD
VOUT
VIN
FPF2123 - FPF2125
OFF ON
ON
ISET
GND
©2005 Fairchild Semiconductor Corporation
FPF2123-FPF2125 Rev. C
1
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Functional Block Diagram
VIN
UVLO
REVERSE
CURRENT
BLOCKING
CONTROL
LOGIC
ON
CURRENT
LIMIT
VOUT
ISET
THERMAL
SHUTDOWN
GND
Pin Configuration
VIN
5
4
VOUT
1
GND
ON
2
3
ISET
SOT23-5
Pin Description
Pin
Name
VIN
Function
1
2
3
4
5
Supply Input: Input to the power switch and the supply voltage for the IC
GND
ON
Ground
ON Control Input
ISET
VOUT
Current Limit Set Input: A resistor from ISET to ground sets the current limit for the switch.
Switch Output: Output of the power switch
2
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FPF2123-FPF2125 Rev. C
Absolute Maximum Ratings
Parameter
Min.
Max.
6
Unit
V
VIN, VOUT, ON, ISET to GND
Power Dissipation @ TA = 25°C (note 1)
Operating Temperature Range
Storage Temperature
-0.3
667
125
150
150
mW
°C
-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
VIN
Ambient Operating Temperature, TA
-40
85
°C
Electrical Characteristics
VIN =1.8to5.5V,TA =-40to+85°Cunlessotherwisenoted. TypicalvaluesareatVIN =3.3VandTA = 25°C.
Parameter
Symbol
Conditions
Min.
Typ.
Max Units
Basic Operation
Operating Voltage
Quiescent Current
VIN
1.8
5.5
V
IQ
IOUT = 0mA
VIN = 1.8 to 3.3V
VIN = 3.3 to 5.5V
75
80
µA
120
2
Shutdown Current
ISHDN
µA
µA
µA
mΩ
Reverse Block Leakage Current
Latch-Off Current
IBLOCK
1
ILATCHOFF FPF2124
50
On-Resistance
RON
VIH
VIL
TA = 25°C, IOUT = 50mA
TA = -40 to +85°C, IOUT = 50mA
125
150
160
ON Input Logic High Voltage (ON)
ON Input Logic Low Voltage
VIN = 1.8V
VIN = 5.5V
VIN = 1.8V
VIN = 5.5V
0.75
1.30
V
V
0.5
1.0
1
ON Input Leakage
Off Switch Leakage
Protections
V
ON = VIN or GND
µA
µA
ISWOFF
VON = 0V, VOUT = 0V
1
Current Limit
ILIM
VIN = 3.3V, VOUT = 3.0V,
600
800
1000
mA
RSET=576Ω
Min. Current Limit
Thermal Shutdown
ILIM(min.)
VIN = 3.3V, VOUT = 3.0V
Shutdown Threshold
Return from Shutdown
Hysteresis
150
140
130
10
mA
°C
Under Voltage Shutdown
UVLO
VIN Increasing
1.5
1.6
50
1.7
V
Under Voltage Shutdown Hysteresis
mV
3
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FPF2123-FPF2125 Rev. C
Electrical Characteristics Cont.
VIN = 1.8 to 5.5V, TA = -40 to +85°C unless otherwise noted. Typical values are at VIN = 3.3V and TA = 25°C.
Parameter
Symbol
Conditions
Min.
Typ.
Max Units
Dynamic
Turn on time
tON
RL=500Ω, CL=0.1uF
25
70
µs
µs
µs
µs
Turn off time
tOFF
tR
RL=500Ω, CL=0.1uF
RL=500Ω, CL=0.1uF
RL=500Ω, CL=0.1uF
FPF2123, FPF2124
FPF2123
VOUT Rise Time
VOUT Fall Time
Over Current Blanking Time
Auto-Restart Time
12
tF
200
10
tBLANK
tRESTART
5
20
ms
ms
80
160
NA
3
320
FPF2124, FPF2125
Short Circuit Response Time
VIN = VON = 3.3V. Moderate
Over-Current Condition.
µs
ns
V
IN = VON = 3.3V. Hard Short.
20
Note 1: Package power dissipation on 1square inch pad, 2 oz copper board.
4
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FPF2123-FPF2125 Rev. C
Typical Characteristics
95
85
75
65
55
45
76
VON = V
IN
74
72
70
68
66
64
62
VIN = 5.5V
VIN = 3.3V
VIN = 1.8V
-40
-15
TJ, JUNCTION TEMPERATURE (oC)
Figure 2. Quiescent Current vs. Temperature
10
35
60
85
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
SUPPLY VOLTAGE (V)
Figure 1. Quiescent Current vs. Input Voltage
500
450
400
350
300
250
200
150
100
50
2500
I_SHDN
I_SWOFF
2000
1500
1000
500
0
VIN = 5.5V
V
IN = 5.5V
VIN = 3.3V
VIN = 3.3V
0
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TJ, JUNCTION TEMPERATURE (oC)
TJ, JUNCTION TEMPERATURE (oC)
Figure 3. ISHUTDOWN Current vs. Temperature
Figure 4. ISWITCH-OFF Current vs. Temperature
0.20
1.4
1.2
1
0.18
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0.00
VIN = 5.5V
0.8
0.6
0.4
0.2
0
VIN = 3.3V
-40
-15
10
35
60
85
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
6.0
TJ, JUNCTION TEMPERATURE (oC)
SUPPLY VOLTAGE (V)
Figure 5. Reverse Current vs. VOUT
Figure 6. Reverse Current vs. Temperature
5
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FPF2123-FPF2125 Rev. C
Typical Characteristics
900
850
800
750
700
55
54
53
52
51
50
49
48
47
46
45
V
IN - VOUT = 0.3V
RSET = 576Ω
-40
-15
10
35
60
85
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
TJ, JUNCTION TEMPERATURE (oC)
VIN, INPUT VOLTAGE (V)
Figure 7. ILATCH-OFF Current vs. Temperature
Figure 8. Current Limit vs. Input Voltage
1600
1200
800
400
0
900
RSET = 576Ω
850
800
750
200
800
1400
RSET, (Ohms)
Figure 10. Current Limit vs. Rest
2000
2600
3200
-40
-15
10
35
60
85
TJ, JUNCTION TEMPERATURE (oC)
Figure 9. Current Limit vs. Temperature
1.5
1.2
0.9
0.6
0.3
0
170
160
150
140
130
120
110
100
90
1
2
3
4
5
6
1
2
3
4
5
6
VIN, Input Voltage (V)
VIN, Input Voltage (V)
Figure 11.
VIH vs. VIN
Figure 12. RON vs. VIN
6
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FPF2123-FPF2125 Rev. C
Typical Characteristics
100
200
180
ILOAD = 10mA
VCC = 3.3V
TD(OFF)
VIN = 1.8V
160
140
VIN = 3.3V
120
100
80
TD(ON)
VIN = 5.5V
60
10
-40
-40
-15
10
35
60
85
-15
10
35
60
85
TJ, JUNCTION TEMPERATURE (oC)
TJ, JUNCTION TEMPERATURE (oC)
Figure 13. R(ON) vs. Temperature
Figure 14. TON/TOff vs. Temperature
14
13
12
11
10
9
1000
100
10
ILOAD = 10mA
VCC = 3.3V
T(FALL)
T(RISE)
1
8
-40
-15
10
35
60
85
-40
-15
10
35
60
85
TJ, JUNCTION TEMPERATURE (oC)
TJ, JUNCTION TEMPERATURE (oC)
Figure 15. TRISE/TFALL vs. Temperature
Figure 16. TBLANK vs. Temperature
200
190
180
170
160
150
140
130
120
VDRV
2V/DIV
VOUT
2V/DIV
IOUT
400mA/DIV
-40
-15
10
35
60
85
TJ, JUNCTION TEMPERATURE (oC)
Figure 17. TRESTART vs. Temperature
Figure 18. TBLANK Response
7
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FPF2123-FPF2125 Rev. C
Typical Characteristics
VDRV
2V/DIV
VON
2V/DIV
VOUT
2V/DIV
IOUT
10mA/DIV
IOUT
400mA/DIV
Figure 19. TRESTART Response
Figure 20. TON Response
VON
2V/DIV
VIN
2V/DIV
IOUT
IOUT
10mA/DIV
4A/DIV
VOUT
2V/DIV
Figure 21. TOFF Response
Figure 22. Short Circuit Response Time
(Output Shorted to GND)
VIN
2V/DIV
V
IN=VON
2V/DIV
VON
2V/DIV
IOUT
400mA/DIV
IOUT
400mA/DIV
Figure 23. Current Limit Response Time
(Switch power up to hard short)
Figure 24. Current Limit Response Time
(Output Shorted to GND by 2.2Ω, moderate short)
8
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FPF2123-FPF2125 Rev. C
Under-Voltage Lockout
Description of Operation
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.
The FPF2123, FPF2124, and FPF2125 are current limited
switches that protect systems and loads which can be damaged
or disrupted by the application of high currents. The core of
each 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 adjustable from 150mA to 1.5A
through the selection of an external resistor.
Thermal Shutdown
The thermal shutdown protects the die from internally or
externally generated excessive temperatures.
During an
over-temperature condition the switch is turned-off. The switch
automatically turns-on again if the temperature of the die drops
below the threshold temperature.
On/OffControl
The ON pin controls the state of the switch. When ON is high,
the switch is in the on state. Activating ON continuously holds
the switch in the on state so long as there is no fault. For all
versions, an under-voltage on VIN or a junction temperature in
excess of 140°C overrides the ON control to turn off the switch.
In addition, excessive currents will cause the switch to turn off in
the FPF2123 and FPF2124. The FPF2123 has an Auto-Restart
feature which will automatically turn the switch on again after
160ms. For the FPF2124, the ON pin must be toggled to
turn-on the switch again. The FPF2125 does not turn off in
response to an over current condition but instead remains
operating in a constant current mode so long as ON is active
and the thermal shutdown or under-voltage lockout have not
activated.
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. The current at which the parts will limit is
adjustable through the selection of an external resistor
connected to ISET. Information for selecting the resistor is
found in the Application Info section. The FPF2123 and
FPF2124 have a blanking time of 10ms, nominally, during which
the switch will act as a constant current source. At the end of
the blanking time, the switch will be turned-off. The FPF2125
has no current limit blanking period so it will remain in a
constant current state until the ON pin is deactivated or the
thermal shutdown turns-off the switch.
Ordering Information
Current Limit
Auto-Restart
Current Limit
[mA]
Blanking Time
[ms]
Time
[ms]
ON Pin
Activity
Part
Top Mark
2123
FPF2123
FPF2124
FPF2125
0.15 - 1.5A
0.15 - 1.5A
0.15 - 1.5A
5/10/20
5/10/20
Infinite
80/160/320
Active HI
Active HI
Active HI
NA
NA
2124
2125
9
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FPF2123-FPF2125 Rev. C
Application Information
Typical Application
LOAD
R2 = 499Ω
VOUT
VIN
FPF2123- FPF2125
Battery
1.8V-5.5V
OFF ON
C1 = 10µF
ON
ISET
GND
C2 = 0.1µF
R1 = 100KΩ
Setting Current Limit
Current Limit Various R
Values
SET
The FPF2123, FPF2124, and FPF2125 have a current limit
which is set with an external resistor connected between ISET
and GND. This resistor is selected by using the following
equation,
RSET
[Ω]
Min. Current
Limit
Typ. Current
Limit
Max. Current
Limit
[mA]
[mA]
[mA]
309
340
1120
1010
920
840
760
690
630
600
570
470
390
320
260
180
110
1490
1350
1230
1120
1010
920
1860
1690
1540
1400
1270
1150
1050
1000
950
460
R
=
(1)
SET
I LIM
374
RSET is in Ohms and that of ILIM is Amps
412
The table below can also be used to select RSET
.
A typical
453
application would be the 500mA current that is required by a
single USB port. Using the table below an appropriate selection
for the RSET resistor would be 604Ω. This will ensure that the
port load could draw 570mA, but not more than 950mA.
Likewise for a dual port system, an RSET of 340Ω would always
deliver at least 1120mA and never more than 1860mA.
499
549
840
576
800
604
760
732
630
790
Input Capacitor
887
520
650
To limit the voltage drop on the input supply caused by transient
in-rush currents when the switch turns-on into a discharged load
capacitance or a short-circuit, a capacitor needs to be placed
between VIN and GND. A 0.1uF ceramic capacitor, CIN, placed
close to the pins is usually sufficient. Higher values of CIN can
be used to further reduce the voltage drop.
1070
1300
1910
3090
430
540
350
440
240
300
150
190
Output Capacitor
Power Dissipation
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 FPF2123 and FPF2124, 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,
During normal operation as a switch, the power dissipated in the
part will depend upon the level at which the current limit is set.
The maximum allowed setting for the current limit is 1.5A and
this will result in a typical power dissipation of,
2
P = (ILIM )2 ∗ RON = (1.5) ∗ 0.125 = 281mW
(3)
If the part goes into current limit the maximum power dissipation
will occur when the output is shorted to ground. For the
FPF2123 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,
I
LIM (max) ∗ tBLANK (min)
(2)
C
OUT (max) =
,
V
IN
10
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FPF2123-FPF2125 Rev. C
tBLANK(max)
P(max)=
∗V (max)∗LLIM(max)
IN
tRESTART(min) + tBLANK(max)
20
(4)
=
∗ 5 . 5 ∗ 1 . 5 = 1 . 65 W
80 + 20
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,
(5)
P(max) = V IN (max) ∗ I LIM (max)
= 5 .5 ∗ 1.5 = 8 . 25 W
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.
11
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FPF2123-FPF2125 Rev. C
Dimensional Outline and Pad Layout
12
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FPF2123-FPF2125 Rev. C
TRADEMARKS
The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is
not intended to be an exhaustive list of all such trademarks.
®
ACEx™
PowerSaver™
SuperSOT™-8
SyncFET™
TinyLogic
ISOPLANAR™
LittleFET™
MICROCOUPLER™
MicroFET™
MicroPak™
MICROWIRE™
MSX™
FAST
®
ActiveArray™
Bottomless™
Build it Now™
CoolFET™
CROSSVOLT™
DOME™
EcoSPARK™
E2CMOS™
EnSigna™
FACT™
PowerTrench
FASTr™
FPS™
FRFET™
GlobalOptoisolator™
GTO™
®
®
QFET
QS™
TINYOPTO™
TruTranslation™
UHC™
QT Optoelectronics™
Quiet Series™
RapidConfigure™
RapidConnect™
μSerDes™
SILENT SWITCHER
SMART START™
SPM™
®
UltraFET
HiSeC™
I2C™
UniFET™
VCX™
Wire™
MSXPro™
OCX™
i-Lo™
ImpliedDisconnect™
IntelliMAX™
®
OCXPro™
OPTOLOGIC
®
OPTOPLANAR™
PACMAN™
POP™
Power247™
PowerEdge™
FACT Quiet Series™
Stealth™
Across the board. Around the world.™
SuperFET™
SuperSOT™-3
SuperSOT™-6
®
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FAIRCHILD SEMICONDUCTOR RESERVESTHE RIGHTTO MAKE CHANGES WITHOUTFURTHER NOTICETOANY
PRODUCTS HEREINTO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOTASSUMEANYLIABILITY
ARISING OUTOFTHEAPPLICATION OR USE OFANYPRODUCTOR CIRCUITDESCRIBED HEREIN; NEITHER DOES IT
CONVEYANYLICENSE UNDER ITS PATENTRIGHTS, NORTHE RIGHTS OF OTHERS.
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FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUTTHE EXPRESS WRITTENAPPROVALOF FAIRCHILD SEMICONDUCTOR CORPORATION.
As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant into
the body, or (b) support or sustain life, or (c) whose
failure to perform when properly used in accordance
with instructions for use provided in the labeling, can be
reasonably expected to result in significant injury to the
user.
2. A critical component is any component of a life
support device or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification
Product Status
Definition
Advance Information
Formative or
In Design
This datasheet contains the design specifications for
product development. Specifications may change in
any manner without notice.
Preliminary
First Production
This datasheet contains preliminary data, and
supplementary data will be published at a later date.
Fairchild Semiconductor reserves the right to make
changes at any time without notice in order to improve
design.
No Identification Needed
Obsolete
Full Production
This datasheet contains final specifications. Fairchild
Semiconductor reserves the right to make changes at
any time without notice in order to improve design.
Not In Production
This datasheet contains specifications on a product
that has been discontinued by Fairchild semiconductor.
The datasheet is printed for reference information only.
Rev. I16
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