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FPF2123
Datasheet (Fairchild)
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Datasheet FPF2123, FPF2125 Datasheet (Fairchild)

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Page 1
tm
September 2006
FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products
FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products
1.8 to 5.5V Input Voltage Range Controlled Turn-On0.15-1.5A Adjustable Current LimitUndervoltage LockoutThermal Shutdown<2uA Shutdown CurrentAuto RestartFast Current limit Response Time
3us to Moderate Over Currents
20ns to Hard ShortsFault BlankingReverse Current Blocking

Applications

PDAsCell PhonesGPS DevicesMP3 PlayersDigital CamerasPeripheral PortsHot Swap Supplies

General Description

The FPF2123, FPF2124, and FPF2125 are a series of load switches which provide 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

Typical Application Circuit

V

FPF2123 - FPF2125

OFF ON ON
IN
GND
V
OUT
ISET

Ordering Information

Current Limit
Current Limit
Part
FPF2123 0.15 - 1.5 5/10/20 80/160/320 Active HI 2123 FPF2124 0.15 - 1.5 5/10/20 NA Active HI 2124 FPF2125 0.15 - 1.5 Infinite NA Active HI 2125
[A]
Blanking Time
[ms]
Auto-Restart
Time
[ms]
ON Pin
Activity Top Mark
TO LOAD
©2006 Fairchild Semiconductor Corporation 1 www.fairchildsemi.com FPF2123-FPF2125 Rev. C4
Page 2

Functional Block Diagram

V
IN
UVLO
FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products
ON
THERMAL
SHUTDOWN

Pin Configuration

CONTROL
LOGIC
V
IN
REVERSE CURRENT BLOCKING
CURRENT
LIMIT
V
OUT
ISET
GND
V
1
5
OUT

Pin Description

Pin Name Function
1V 2 GND Ground 3 ON ON Control Input 4 ISET Current Limit Set Input: A resistor from ISET to ground sets the current limit for the switch. 5V
FPF2123-FPF2125 Rev. C4
IN
OUT
2
GND
34
ON
SOT23-5
Supply Input: Input to the power switch and the supply voltage for the IC
Switch Output: Output of the power switch
2 www.fairchildsemi.com
ISET
Page 3

Absolute Maximum Ratings

Parameter Min. Max. Unit
VIN, V Power Dissipation @ T Operating Temperature Range -40 125 °C Storage Temperature -65 150 °C Thermal Resistance, Junction to Ambient 150 °C/W Electrostatic Discharge Protection HBM 4000 V
, ON, ISET to GND -0.3 6 V
OUT
= 25°C (note 1) 667 mW
A
MM 400 V

Recommended Operating Range

Parameter Min. Max. Unit
V
IN
Ambient Operating Temperature, T
A
1.8 5.5 V
-40 85 °C
Electrical Characteristics
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
Basic Operation
Operating Voltage V Quiescent Current I
Shutdown Current I Reverse Block Leakage Current I Latch-Off Current I On-Resistance R
ON Input Logic High Voltage (ON) V
ON Input Logic Low Voltage V
ON Input Leakage V Off Switch Leakage I
IN
Q
SHDN BLOCK LATCHOFF
ON
IH
IL
SWOFF
I
= 0mA VIN = 1.8 to 3.3V 75 µA
OUT
= 3.3 to 5.5V 80 120
V
IN
FPF2124 50 µA TA = 25°C, I
= -40 to +85°C, I
T
A
= 50mA 125 160 mΩ
OUT
= 50mA 150
OUT
VIN = 1.8V 0.75 V
= 5.5V 1.30
V
IN
VIN = 1.8V 0.5 V
= 5.5V 1.0
V
IN
= VIN or GND 1 µA
ON
VON = 0V, V
= 0V 1 µA
OUT
Protections
Current Limit I
Min. Current Limit I
LIM
LIM(min.)
VIN = 3.3V, V RSET=576Ω
VIN = 3.3V, V
= 3.0V,
OUT
= 3.0V 150 mA
OUT
Thermal Shutdown Shutdown Threshold 140 °C
Return from Shutdown 130 Hysteresis 10
Under Voltage Shutdown UVLO V
Increasing 1.5 1.6 1.7 V
IN
Under Voltage Shutdown Hysteresis 50 mV
1.8 5.5 V
2 µA 1 µA
600 800 1000 mA
FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products
FPF2123-FPF2125 Rev. C4
3 www.fairchildsemi.com
Page 4
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 t Turn off time t
Rise Time t
V
OUT
Fall Time t
V
OUT
Over Current Blanking Time t Auto-Restart Time t
ON OFF R F BLANK RESTART
Short Circuit Response Time V

Note 1: Package power dissipation on 1square inch pad, 2 oz copper board.

RL=500Ω, CL=0.1uF 25 µs RL=500Ω, CL=0.1uF 70 µs RL=500Ω, CL=0.1uF 12 µs RL=500Ω, CL=0.1uF 200 µs FPF2123, FPF2124 5 10 20 ms FPF2123 80 160 320 ms FPF2124, FPF2125 NA
= VON = 3.3V. Moderate
IN
Over-Current Condition. V
= VON = 3.3V. Hard Short. 20 µs
IN
3 µs
FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products
FPF2123-FPF2125 Rev. C4
4 www.fairchildsemi.com
Page 5
Typical Characteristics
FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products
76
VON = V
74
72
70
68
66
SUPPLY CURRENT (uA)
64
62
IN
1.522.533.544.555.56
SUPPLY VOLTAGE (V)
95
85
75
65
SUPPLY CURRENT (uA)
55
45
-40 -15 10 35 60 85
V
= 5.5V
TJ, JUNCTION TEMPERATURE (
V
= 3.3V
IN
VIN = 1.8V
Figure 1. Quiescent Current vs. Input Voltage Figure 2. Quiescent Current vs. Temperature
2500
I_SHDN
2000
1500
1000
SUPPLY CURRENT (nA)
500
0
-40 -15 10 35 60 85
Figure 3. I
V
= 5.5V
V
= 3.3V
, JUNCTION TEMPERATURE (oC)
T
J
SHUTDOWN
Current vs. Temperature Figure 4. I
500
I_SWOFF
450
400
350
300
250
200
150
SUPPLY CURRENT (nA)
100
50
0
-40 -15 10 35 60 85
T
J
SWITCH-OFF
V
= 5.5V
V
= 3.3V
, JUNCTION TEMPERATURE (oC)
Current vs. Temperature
o
C)
0.20
0.18
0.16
0.14
0.12
0.10
0.08
0.06
SUPPLY CURRENT (uA)
0.04
0.02
0.00
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
SUPPLY VOLTAGE (V)
Figure 5. Reverse Current vs. V
FPF2123-FPF2125 Rev. C4
1.4
1.2
1
0.8
0.6
0.4
SUPPLY CURRENT (uA)
0.2
0
-40 -15 10 35 60 85
TJ, JUNCTION TEMPERATURE (oC)
Figure 6. Reverse Current vs. Temperature
OUT
VIN = 5.5V
5 www.fairchildsemi.com
VIN = 3.3V
Page 6
Typical Characteristics
FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products
55
54
53
52
51
50
49
48
SUPPLY CURRENT (uA)
47
46
45
-40 -15 10 35 60 85
TJ, JUNCTION TEMPERATURE (oC)
Figure 7. I
900
R
= 576Ω
SET
850
LATCH-OFF
Current vs. Temperature Figure 8. Current Limit vs. Input Voltage
900
VIN - V
= 0.3V
OUT
= 576Ω
R
SET
850
800
750
OUTPUT CURRENT (mA)
700
1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
INPUT VOLTAGE (V)
V
IN,
1600
1200
800
800
OUTPUT CURRENT (mA)
750
-40 -15 10 35 60 85
TJ, JUNCTION TEMPERATURE (oC)
400
OUTPUT CURRENT (mA)
0
200 800 1400 2000 2600 3200
(Ohms)
R
SET,
Figure 9. Current Limit vs. Temperature Figure 10. Current Limit vs. Rest
1.5
1.2
0.9
0.6
ON THRESHOLD (V)
0.3
0
123456
V
, Input Voltage (V)
IN
170
160
150
140
130
(mOhms)
(ON)
120
R
110
100
90
123456
, Input Voltage (V)
V
IN
Figure 11. V
FPF2123-FPF2125 Rev. C4
IH
vs. V
IN
Figure 12. RON vs. V
IN
6 www.fairchildsemi.com
Page 7
Typical Characteristics
FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products
200
180
160
140
(mOhms)
120
(ON)
R
100
80
60
-40 -15 10 35 60 85
Figure 13. R
1000
I
LOAD
V
CC
100
10
TURN-ON/OFF TIMES (uS)
= 10mA
= 3.3V
VIN = 1.8V
VIN = 3.3V
T
, JUNCTION TEMPERATURE (oC)
J
vs. Temperature Figure 14. TON/T
(ON)
T
(FALL)
T
(RISE)
VIN = 5.5V
100
I
= 10mA
LOAD
V
= 3.3V
CC
TURN-ON/OFF TIMES (uS)
10
-40 -15 10 35 60 85
TJ, JUNCTION TEMPERATURE (oC)
14
13
12
11
10
FLAG-BLANKING TIME (mS)
9
TD
(OFF)
TD
(ON)
vs. Temperature
Off
1
-40 -15 10 35 60 85
T
, JUNCTION TEMPERATURE (oC)
J
Figure 15. T
200
190
180
170
160
150
RESTART TIME (mS)
140
130
120
-40 -15 10 35 60 85
TJ, JUNCTION TEMPERATURE (oC)
Figure 17. T
RISE/TFALL
RESTART
8
-40 -15 10 35 60 85
, JUNCTION TEMPERATURE (oC)
T
J
vs. Temperature Figure 16. T
V
ON
BLANK
2V/DIV
V
OUT
2V/DIV
I
OUT
400mA/DIV
vs. Temperature Figure 18. T
vs. Temperature
VIN= 3.3V
=5.1Ω
R
L
C
=10uF
IN
= 0.1uF
C
OUT
Response
BLANK
FPF2123-FPF2125 Rev. C4
7 www.fairchildsemi.com
Page 8
Typical Characteristics
FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products
V 2V/DIV
V 2V/DIV
I 400mA/DIV
ON
OUT
OUT
VIN=3.3V R
=5.1Ω
L
=10uF
C
IN
C
= 0.1uF
OUT
Figure 19. T
V 2V/DIV
I 10mA/DIV
OUT
ON
VIN=3.3V R
=500Ω
L
C
=10uF
IN
C
= 0.1uF
OUT
V
ON
2V/DIV
I
OUT
10mA/DIV
Response F ig ur e 20. TON Response
RESTART
V
IN
2V/DIV
C
=10uF
IN
C
= 0.1uF
OUT
I
OUT
4A/DIV V
OUT
2V/DIV
V R C C
IN L IN
OUT
=3.3V
=500Ω
=10uF
= 0.1uF
Figure 21. T
Response Figure 22. Short Circuit Response
OFF
(Output Shorted to GND)
V
IN=VON
2V/DIV
I
OUT
400mA/DIV
CIN=10uF C
= 0.1uF
OUT
V 2V/DIV
V 2V/DIV
I 400mA/DIV
IN
ON
OUT
R C C
=2.2Ω
L
=10uF
IN OUT
= 0.1uF
Figure 23. Current Limit Response Figure 24. Current Limit Response
(Switch power up to hard short) (Output Shorted to GND by 2.2Ω, moderate short)
FPF2123-FPF2125 Rev. C4
8 www.fairchildsemi.com
Page 9
FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products

Description of Operation

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.
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 V 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 re mains 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.
or a junction temperature in
IN
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.
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.
FPF2123-FPF2125 Rev. C4
9 www.fairchildsemi.com
Page 10

Application Information

Typical Application

FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products
V
IN
FPF2123- FPF2125
Battery
5.5V
OFF ON ON
C1=10uF
5.5V MAX
Setting Current Limit
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,
460
R
----------=
SET
I
LIM
R The table below can also be used to select R
is in Ohms and that of I
SET
is Amps
LIM
application would be the 500mA current that is required by a
(1)
. A typical
SET
single USB port. Using the table below an appropriate selection for the R port load could draw 570mA, but not more than 950mA. Likewise for a dual port system, an R deliver at least 1120mA and never more than 1860mA.
resistor would be 604Ω. This will ensure that the
SET
of 340Ω would always
SET
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 capacitance or a short-circuit, a capacitor needs to be placed between V close to the pins is usually sufficient. Higher values of C be used to further reduce the voltage drop.
and GND. A 0.1uF ceramic capacitor, CIN, placed
IN
IN
can
Output Capacitor
A 0.1uF capacitor, C GND. This capacitor will prevent parasitic board inductances from forcing V the FPF2123 and FPF2124, the total output capacitance needs
OUT
to be kept below a maximum value, C part from registering an over-current condition and turning-off the switch. The maximum output capacitance can be determined from the following formula,
C
OUT
, should be placed between V
OUT
OUT
and
below GND when the switch turns-off. For
, to prevent the
min()×
(2)
max()
I
LIM
------------------------------ ----------------------- ------------=
min()t
OUT(max)
BLANK
V
IN
V
OUT
ISET
GND
R
SET
Current Limit Various R
R
SET
[Ω]
Min. Current
Limit [mA]
C2=0.1uF
Values
SET
Typ. Current
Limit [mA]
R2=110Ω
Max. Current
Limit
[mA] 309 1120 1490 1860 340 1010 1350 1690 374 920 1230 1540 412 840 1120 1400 453 760 1010 1270 499 690 920 1150 549 630 840 1050 576 600 800 1000 604 570 760 950 732 470 630 790 887 390 520 650
1070 320 430 540 1300 260 350 440 1910 180 240 300 3090 110 150 190
Power Dissipation
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,
PI
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, t
RESTART
so that the maximum power dissipated is,
2
()=
RON× 1.5()20.125×= 281mW=
LIM
, and the Over Current Blanking Time, t
(3)
BLANK
,
FPF2123-FPF2125 Rev. C4
10 www.fairchildsemi.com
Page 11
Pmax()
This is more power than the package can dissipate, but the
----------------------------- ----------------------- ----------------------- ------
t
-------------------
80 20+
RESTART
20
min()t
BLANK
5.5× 1.5×= 1.65W=
V
max()× I
IN
max()+
LIM
max()×=
(4)
max()
t
BLANK
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,
Pmax()V
max()I
·
IN
5.5 1.5×= 8.25W=
LIM
max()×=
(5)
This large amount of power will activate the thermal shutd own 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 V minimize parasitic electrical effects along with minimizing the case to ambient thermal impedance.
, V
IN
and GND will help
OUT
FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products
FPF2123-FPF2125 Rev. C4
11 www.fairchildsemi.com
Page 12

Dimensional Outline and Pad Layout

FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products
FPF2123-FPF2125 Rev. C4
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Page 13
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™ ActiveArray™ Bottomless™ Build it Now™ CoolFET™ CROSSVOLT™ DOME™ EcoSPARK™
2
E
CMOS™ EnSigna™ FACT™
®
FAST FASTr™ FPS™ FRFET™
FACT Quiet Series™ GlobalOptoisolator™ GTO™ HiSeC™
2
I
C™ i-Lo™ ImpliedDisconnect™ IntelliMAX™ ISOPLANAR™ LittleFET™ MICROCOUPLER™ MicroFET™ MicroPak™ MICROWIRE™ MSX™ MSXPro™
Across the board. Around the world.™ The Power Franchise
®
OCX™ OCXPro™ OPTOLOGIC
®
OPTOPLANAR™ PACMAN™ POP™ Power247™ PowerEdge™ PowerSaver™ PowerTrench QFET
®
®
QS™ QT Optoelectronics™ Quiet Series™ RapidConfigure™ RapidConnect™ µSerDes™ ScalarPump™
SILENT SWITCHER SMART START™ SPM™ Stealth™ SuperFET™ SuperSOT™-3 SuperSOT™-6 SuperSOT™-8 SyncFET™ TCM™ TinyBoost™ TinyBuck™ TinyPWM™ TinyPower™ TinyLogic
®
TINYOPTO™ TruTranslation™ UHC™
Programmable Active Droop™
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. THESE SPECIFICATIONS DO NOT EXPAND THE TERMS OF FAIRCHILD’S WORLDWIDE TERMS AND CONDITIONS, SPECIFICALLY THE WARRANTY THEREIN, WHICH COVERS THESE PRODUCTS.
®
UniFET™ UltraFET VCX™ Wire™
®
FPF2123-FPF2125 IntelliMAX™ Advanced Load Management Products
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF 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
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.
user.
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 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.
Obsolete 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.
FPF2123-FPF2125 Rev. C4
Rev. I20
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