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FPF2123-FPF2125 IntelliMAXTM Advanced Load Management Products
August 2005
FPF2123-FPF2125 IntelliMAXTM 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
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 0.125 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
Applications
PDAs Cell Phones GPS Devices MP3 Players Digital Cameras Peripheral Ports Hot Swap Supplies
Typical Application Circuit
TO LOAD VIN VOUT
FPF2123 - FPF2125
OFF ON ON GND ISET
(c)2005 Fairchild Semiconductor Corporation
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FPF2123-FPF2125 Rev. C
FPF2123-FPF2125 IntelliMAXTM Advanced Load Management Products
Functional Block Diagram
VIN
UVLO REVERSE CURRENT BLOCKING CURRENT LIMIT THERMAL SHUTDOWN VOUT ISET
ON
CONTROL LOGIC
GND
Pin Configuration
VIN 1 GND ON 2 3 SOT23-5 4 ISET 5 VOUT
Pin Description
Pin
1 2 3 4 5
Name
VIN GND ON ISET VOUT Ground ON Control Input
Function
Supply Input: Input to the power switch and the supply voltage for the IC
Current Limit Set Input: A resistor from ISET to ground sets the current limit for the switch. Switch Output: Output of the power switch
FPF2123-FPF2125 Rev. C
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FPF2123-FPF2125 IntelliMAXTM Advanced Load Management Products
Absolute Maximum Ratings
Parameter
VIN, VOUT, ON, ISET to GND Power Dissipation @ TA = 25C (note 1) Operating Temperature Range Storage Temperature Thermal Resistance, Junction to Ambient Electrostatic Discharge Protection HBM MM 4000 400 -40 -65
Min.
-0.3
Max.
6 667 125 150 150
Unit
V mW C C C/W V V
Recommended Operating Range
Parameter
VIN Ambient Operating Temperature, TA
Min.
1.8 -40
Max.
5.5 85
Unit
V C
Electrical Characteristics
VIN = 1.8 to 5.5V, TA = -40 to +85C unless otherwise noted. Typical values are at VIN = 3.3V and TA = 25C.
Parameter
Basic Operation Operating Voltage Quiescent Current Shutdown Current Reverse Block Leakage Current Latch-Off Current On-Resistance ON Input Logic High Voltage (ON) ON Input Logic Low Voltage ON Input Leakage Off Switch Leakage Protections Current Limit Min. Current Limit Thermal Shutdown
Symbol
VIN IQ ISHDN IBLOCK ILATCHOFF RON VIH VIL FPF2124
Conditions
Min.
1.8
Typ.
Max
5.5
Units
V A
IOUT = 0mA
VIN = 1.8 to 3.3V VIN = 3.3 to 5.5V
75 80 120 2 1 50 125 150 0.75 1.30 0.5 1.0 1 1 600 800 150 140 130 10 1.5 1.6 50 1.7 1000 160
A A A m V V A A mA mA C
TA = 25C, IOUT = 50mA TA = -40 to +85C, IOUT = 50mA VIN = 1.8V VIN = 5.5V VIN = 1.8V VIN = 5.5V VON = VIN or GND
ISWOFF ILIM ILIM(min.)
VON = 0V, VOUT = 0V VIN = 3.3V, VOUT = 3.0V, RSET=576 VIN = 3.3V, VOUT = 3.0V Shutdown Threshold Return from Shutdown Hysteresis
Under Voltage Shutdown Under Voltage Shutdown Hysteresis
UVLO
VIN Increasing
V mV
FPF2123-FPF2125 Rev. C
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FPF2123-FPF2125 IntelliMAXTM Advanced Load Management Products
Electrical Characteristics Cont.
VIN = 1.8 to 5.5V, TA = -40 to +85C unless otherwise noted. Typical values are at VIN = 3.3V and TA = 25C.
Parameter
Dynamic Turn on time Turn off time VOUT Rise Time VOUT Fall Time Over Current Blanking Time Auto-Restart Time Short Circuit Response Time
Symbol
tON tOFF tR tF tBLANK tRESTART
Conditions
RL=500, CL=0.1uF RL=500, CL=0.1uF RL=500, CL=0.1uF RL=500, CL=0.1uF FPF2123, FPF2124 FPF2123 FPF2124, FPF2125 VIN = VON = 3.3V. Moderate Over-Current Condition. VIN = VON = 3.3V. Hard Short.
Min.
Typ.
25 70 12 200
Max
Units
s s s s
5 80
10 160 NA 3 20
20 320
ms ms s ns
Note 1: Package power dissipation on 1square inch pad, 2 oz copper board.
FPF2123-FPF2125 Rev. C
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FPF2123-FPF2125 IntelliMAXTM Advanced Load Management Products
Typical Characteristics
76
95
VON = VIN
74
SUPPLY CURRENT (uA)
72 70 68 66 64 62 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 SUPPLY VOLTAGE (V)
SUPPLY CURRENT (uA)
85
75
VIN = 5.5V
VIN = 3.3V VIN = 1.8V
65
55
45 -40
-15
10
35
o
60
85
TJ, JUNCTION TEMPERATURE ( C)
Figure 1. Quiescent Current vs. Input Voltage
Figure 2. Quiescent Current vs. Temperature
2500
I_SHDN VIN = 5.5V
500 450 SUPPLY CURRENT (nA) 400 350 300 250 200 150 100 50
I_SWOFF
SUPPLY CURRENT (nA)
2000
1500
VIN = 5.5V
1000
500
VIN = 3.3V
VIN = 3.3V
0 -40
-15
10
35
60
85
0 -40
-15
10
35
o
60
85
TJ, JUNCTION TEMPERATURE (oC)
TJ, JUNCTION TEMPERATURE ( C)
Figure 3. ISHUTDOWN Current vs. Temperature
Figure 4. ISWITCH-OFF Current vs. Temperature
0.20 0.18 SUPPLY CURRENT (uA) 0.16
SUPPLY CURRENT (uA)
1.4 1.2 1 VIN = 5.5V 0.8 0.6 0.4 VIN = 3.3V 0.2 0 -40
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 6.0 SUPPLY VOLTAGE (V)
-15
10
35
60
85
TJ, JUNCTION TEMPERATURE (oC)
Figure 5. Reverse Current vs. VOUT
Figure 6. Reverse Current vs. Temperature
FPF2123-FPF2125 Rev. C
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FPF2123-FPF2125 IntelliMAXTM Advanced Load Management Products
Typical Characteristics
55 54
900 VIN - VOUT = 0.3V RSET = 576 OUTPUT CURRENT (mA)
-15 10 35 60 85
SUPPLY CURRENT (uA)
53 52 51 50 49 48 47 46 45 -40
850
800
750
700 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
900 RSET = 576 OUTPUT CURRENT (mA)
1600
OUTPUT CURRENT (mA)
1200
850
800
800
400
750 -40
-15
10
35
o
60
85
0 200
800
1400
2000
2600
3200
TJ, JUNCTION TEMPERATURE ( C)
RSET, (Ohms)
Figure 9. Current Limit vs. Temperature
Figure 10. Current Limit vs. Rest
1.5
170 160
1.2 ON THRESHOLD (V)
150
R(ON) (mOhms)
0.9
140 130 120 110 100
0.6
0.3
0 1 2 3 4 5 6 VIN, Input Voltage (V)
90 1 2 3 4 5 6 VIN, Input Voltage (V)
Figure 11. VIH vs. VIN
Figure 12. RON vs. VIN
FPF2123-FPF2125 Rev. C
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FPF2123-FPF2125 IntelliMAXTM Advanced Load Management Products
Typical Characteristics
200 180
100
ILOAD = 10mA VCC = 3.3V
TURN-ON/OFF TIMES (uS)
VIN = 1.8V
TD(OFF)
160 R(ON) (mOhms) 140 120
VIN = 5.5V
VIN = 3.3V
TD(ON)
100 80 60 -40
-15
10
35
60
85
10 -40
-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
1000
ILOAD = 10mA VCC = 3.3V T(FALL)
14 13 12 11 10 9 8 -40
100
T(RISE)
10
1 -40
-15
10
35
60
85
FLAG-BLANKING TIME (mS)
TURN-ON/OFF TIMES (uS)
-15
10
35
o
60
85
TJ, JUNCTION TEMPERATURE (oC)
TJ, JUNCTION TEMPERATURE ( C)
Figure 15. TRISE/TFALL vs. Temperature
Figure 16. TBLANK vs. Temperature
200 190
RESTART TIME (mS)
180 170 160 150 140 130 120 -40
VDRV 2V/DIV VOUT 2V/DIV
IOUT 400mA/DIV
-15 10 35 60 85
TJ, JUNCTION TEMPERATURE (oC)
Figure 17. TRESTART vs. Temperature
Figure 18. TBLANK Response
FPF2123-FPF2125 Rev. C
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FPF2123-FPF2125 IntelliMAXTM Advanced Load Management Products
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 10mA/DIV
IOUT 4A/DIV VOUT 2V/DIV
Figure 21. TOFF Response
Figure 22. Short Circuit Response Time (Output Shorted to GND)
VIN 2V/DIV VIN=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 2.2, moderate short)
FPF2123-FPF2125 Rev. C
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FPF2123-FPF2125 IntelliMAXTM 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 0.125 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.
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.
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 140C 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
Part
FPF2123 FPF2124 FPF2125
Current Limit [mA]
0.15 - 1.5A 0.15 - 1.5A 0.15 - 1.5A
Current Limit Blanking Time [ms]
5/10/20 5/10/20 Infinite
Auto-Restart Time [ms]
80/160/320 NA NA
ON Pin Activity
Active HI Active HI Active HI
Top Mark
2123 2124 2125
FPF2123-FPF2125 Rev. C
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FPF2123-FPF2125 IntelliMAXTM Advanced Load Management Products
Application Information
Typical Application
LOAD R2 = 499
VIN Battery 1.8V-5.5V
VOUT
FPF2123- FPF2125
OFF ON C1 = 10F R1 = 100K ON GND ISET C2 = 0.1F
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,
Current Limit Various RSET Values
RSET [] 309 340 374 412 453 499 549 576 604 732 887 1070 1300 1910 3090 Min. Current Limit [mA] 1120 1010 920 840 760 690 630 600 570 470 390 320 260 180 110 Typ. Current Limit [mA] 1490 1350 1230 1120 1010 920 840 800 760 630 520 430 350 240 150 Max. Current Limit [mA] 1860 1690 1540 1400 1270 1150 1050 1000 950 790 650 540 440 300 190
R
SET
460 = I LIM
(1)
RSET is in Ohms and that of ILIM is Amps The table below can also be used to select RSET. A typical 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 604. This will ensure that the port load could draw 570mA, but not more than 950mA. Likewise for a dual port system, an RSET of 340 would always deliver at least 1120mA and never more than 1860mA.
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 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.
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,
Output Capacitor
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,
Power Dissipation
P = (I LIM ) 2 R ON = (1.5) 2 0.125 = 2 81mW
(3)
C OUT (max) =
I LIM (max) t BLANK (min) V IN
(2)
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,
FPF2123-FPF2125 Rev. C
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FPF2123-FPF2125 IntelliMAXTM Advanced Load Management Products
P(max)=
t BLANK(max) VIN (max) L LIM (max) t RESTART(min) + t BLANK(max)
=
20 5 . 5 1 . 5 = 1 . 65 W 80 + 20
(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 . 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.
FPF2123-FPF2125 Rev. C
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FPF2123-FPF2125 IntelliMAXTM Advanced Load Management Products
Dimensional Outline and Pad Layout
FPF2123-FPF2125 Rev. C
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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.
ACExTM FAST(R) ActiveArrayTM FASTrTM BottomlessTM FPSTM Build it NowTM FRFETTM CoolFETTM GlobalOptoisolatorTM CROSSVOLTTM GTOTM DOMETM HiSeCTM EcoSPARKTM I2CTM E2CMOSTM i-LoTM EnSignaTM ImpliedDisconnectTM FACTTM IntelliMAXTM FACT Quiet SeriesTM Across the board. Around the world.TM The Power Franchise(R) Programmable Active DroopTM
DISCLAIMER
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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. 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: 2. A critical component is any component of a life 1. Life support devices or systems are devices or support device or system whose failure to perform can systems which, (a) are intended for surgical implant into be reasonably expected to cause the failure of the life the body, or (b) support or sustain life, or (c) whose support device or system, or to affect its safety or failure to perform when properly used in accordance with instructions for use provided in the labeling, can be effectiveness. reasonably expected to result in significant injury to the user. PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Advance Information Product Status Formative or In Design Definition This datasheet contains the design specifications for product development. Specifications may change in any manner without notice. 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. This datasheet contains final specifications. Fairchild Semiconductor reserves the right to make changes at any time without notice in order to improve design.
Preliminary
First Production
No Identification Needed
Full Production
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.
Rev. I16

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