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FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
October 2008
FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
Features
1.8 to 5.5V Input Voltage Range Controlled Turn-On 0.15-1.5A Adjustable Current Limit Undervoltage Lockout Thermal Shutdown <2A Shutdown Current Auto Restart Fast Current limit Response Time 5s to Moderate Over Currents 30ns to Hard Shorts Fault Blanking Reverse Current Blocking RoHS Compliant
tm
General Description
The FPF2163, FPF2164, and FPF2165 is a series of load switches which provides full protection to systems and loads which may encounter large current conditions. These devices contain a 0.12 current-limited P-channel MOSFET which can operate over an input voltage range of 1.8-5.5V. 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 FPF2163 and FPF2164, if the constant current condition still persists after 30ms, these parts will shut off the switch and pull the fault signal pin (FLAGB) low. The FPF2163 has an auto-restart feature which will turn the switch on again after 450ms if the ON pin is still active. The FPF2164 does not have this auto-restart feature so the switch will remain off until the ON pin is cycled. The FPF2165 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 6 pin 2X2 MLP package.
Applications
PDAs Cell Phones GPS Devices MP3 Players Digital Cameras Peripheral Ports Hot Swap Supplies
Pin 1 BOTTOM TOP
Ordering Information
Current Limit [mA]
150-1500 150-1500 150-1500
Part
FPF2163 FPF2164 FPF2165
Current Limit Blanking Time [ms]
15/30/60 15/30/60 0
Auto-Restart Time [ms]
225/450/900 NA NA
ON Pin Activity
Active HI Active HI Active HI
Top Mark
163 164 165
(c)2008 Fairchild Semiconductor Corporation
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FPF2163/4/5 Rev. I
FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
Typical Application Circuit
TO LOAD VIN
FPF2163/4/5
VOUT
FLAGB ISET
OFF ON
ON GND
Functional Block Diagram
VIN
UVLO
ON
CONTROL LOGIC
REVERSE CURRENT BLOCKING
CURRENT LIMIT THERMAL SHUTDOWN
VOUT ISET FLAGB
GND
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FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
Pin Configuration
ON GND FLAGB 6 5 4 7 1 2 3 ISET VIN VOUT
2X2 MicroFET-6
Pin Description
Pin
1 2 3 4 5, 7 6
Name
ISET VIN VOUT FLAGB GND ON
Function
Current Limit Set Input: A resistor from ISET to ground sets the current limit for the switch. Supply Input: Input to the power switch and the supply voltage For the IC Switch Output: Output of the power switch Fault Output: Active LO, open drain output which indicates an over current supply under voltage or over temperature state. Ground ON Control Input
Absolute Maximum Ratings
Parameter
VIN, VOUT, ON, FLAGB, ISET to GND Power Dissipation Operating and Storage Junction Temperature Thermal Resistance, Junction to Ambient Jedec A114A Jedec C101C Electrostatic Discharge Protection Jedec A115 IEC 61000-4-2 HBM CDM MM Air Discharge Contact Discharge 4000 2000 400 15000 8000 -65
Min
-0.3
Max
6 1.2 150 86
Unit
V W C C/W V V V 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
Symbol
VIN
Conditions
Min
1.8
Typ
Max Units
5.5 V A 120
VIN = 1.8V IQ IOUT = 0mA VIN = 3.3V VIN = 5.5V
63 68 77
100
FPF2163/4/5 Rev. I
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FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
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
On-Resistance
Symbol
RON
Conditions
VIN = 3.3V, IOUT = 200mA, TA = 25C VIN = 3.3V, IOUT = 200mA, TA = 85C VIN = 3.3V, IOUT = 200mA, TA = -40C to +85C VIN = 1.8V VIN = 5.5V VIN = 1.8V VIN = 5.5V VON = VIN or GND VON = 0V, VIN = 5.5V, VOUT = short to GND VIN = 5V, ISINK = 10mA VIN = 1.8V, ISINK = 10mA VIN = 5V, Switch on
Min
Typ
120 135
Max
160 180 180
Units
m
65 0.8 1.4
ON Input Logic High Voltage (ON) ON Input Logic Low Voltage ON Input Leakage VIN Shutdown Current FLAGB Output Logic Low Voltage FLAGB Output High Leakage Current Reverse Block VOUT Shutdown Current Protections Current Limit Min. Current Limit Thermal Shutdown Under Voltage Shutdown Under Voltage Shutdown Hysteresis Dynamic Delay On Time Delay Off Time VOUT Rise Time VOUT Fall Time Over Current Blanking Time Auto-Restart Time Short Circuit Response Time
VIH VIL
V 0.5 1 V A A V A
-1 -2 0.05 0.12
1 2 0.2 0.3 1
VON = 0V, VOUT = 5.5V, VIN = short to GND ILIM ILIM(min.) VIN = 3.3V, VOUT = 3.0V, RSET = 345 VIN = 3.3V, VOUT = 3.0V Shutdown Threshold Return from Shutdown Hysteresis UVLO VIN Increasing
-2
2
A
600
800 150 140 130 10
1000
mA mA C
1.55
1.65 50
1.75
V mV
tdON tdOFF tRISE tFALL tBLANK tRSTRT
RL = 500, CL = 0.1F RL = 500, CL = 0.1F RL = 500, CL = 0.1F RL = 500, CL = 0.1F FPF2163, FPF2164 FPF2163 VIN = VOUT = 3.3V. Moderate Over-Current Condition. VIN = VOUT = 3.3V. Hard Short. 15 225
25 45 10 110 30 450 5 30 60 900
s s s s ms ms s ns
Note 1: Package power dissipation on 1square inch pad, 2 oz copper board.
FPF2163/4/5 Rev. I
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FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
Typical Characteristics
78 76 SUPPLY CURRENT (uA) 74 72 70 68 66 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 SUPPLY VOLTAGE (V) 100 95 SUPPLY CURRENT (uA) 90 85 80 75 70 65 60 55 50
VIN = 1.8V VIN = 5.5V VIN = 3.3V
-40
-15
10
35
60
85
TJ, JUNCTION TEMPERATURE (C)
Figure 1. Quiescent Current vs. Input Voltage
Figure 2. Quiescent Current vs. Temperature
1.5 1.4 VON HIGH VOLTAGE (V)
VON LOW VOLTAGE (V)
1.2 1.1 1 0.9 0.8 0.7 0.6 0.5
1.3 1.2 1.1 1 0.9 0.8 0.7 0.6 1.5 2 2.5 3 3.5 4 4.5 SUPPLY VOLTAGE (V) 5 5.5 6
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
SUPPLY VOLTAGE (V)
Figure 3. VON High Voltage vs. Input Voltage
Figure 4. VON Low Voltage vs. Input Voltage
200 190 180 170 RON (mOhms) 150 140 130 120 110 100 90 80 1 2 3 4 5 6 SUPPLY VOLTAGE(V)
RON (mOhms)
240 220 200 180 160 140 120 100 80 60 -40
VIN= 5.5V VIN= 3.3V VIN= 1.8V
160
-15
10 35 TJ, JUNCTION TEMPERATURE (C)
60
85
Figure 5. RON vs. VIN
Figure 6. RON vs. Temperature
FPF2163/4/5 Rev. I
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FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
Typical Characteristics
900 800 OUTPUT CURRENT (mA) 700 600 500 400 300 200 100 0 0 1 2 3 VIN - VOUT (V) 4 5 6
VIN = 5.5V RSET = 345 Ohms
900 880 860 CURRENT LIMIT (mA) 840 820 800 780 760 740 720 700 -65 -40 -15 10 35 60 85 110 135 TJ, JUNCTION TEMPERATURE (C)
Figure 7. Current Limit vs. Output Voltage
Figure 8. Current Limit vs. Temperature
100
VIN = 3.3 V RL = 500 Ohm s COUT = 0.1uF
1000
VIN = 3.3 V RL = 500 Ohm s
DELAY ON/OFF TIME (uS)
RISE / FALL TIME (uS)
tdOFF
TF
100
tdON
10
TR
10 -40
-15
10
35
60
85
1 -40
-15
TJ, JUNCTION TEMPERATURE (C)
10 35 TJ, JUNCTION TEMPERATURE (C)
60
85
Figure 9. tdON / tdOFF vs. Temperature
Figure 10. TRISE / TFALL vs. Temperature
33 32.5 BLANK TIME (mS) 32 31.5 31 30.5 30 29.5 -40 -15 10 35 TJ, JUNCTION TEMPERATURE (C) 60 85 RESTART TIME (mS)
500 495 490 485 480 475 470 465 460 455 450 -40 -15 10 35 60 85 TJ, JUNCTION TEMPERATURE (C)
Figure 11. TBLANK vs. Temperature
Figure 12. TRESTART vs. Temperature
FPF2163/4/5 Rev. I
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FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
Typical Characteristics
VDRV2 2V/DIV VFLAGB 2V/DIV IOUT 500mA/DIV CIN = 10F COUT = 0.1F RL = 500 RSET = 392 VIN = 3.3V 20ms/DIV Figure 13. TBLANK Response TBLANK VDRV2 2V/DIV VFLAGB 2V/DIV IOUT 500mA/DIV CIN = 10F COUT = 0.1F RL = 500 RSET = 392 VIN = 3.3V 100ms/DIV Figure 14. TRESTART Response TRESTART
VOUT 2V/DIV
VOUT 2V/DIV
VIN 2V/DIV VON 2V/DIV IOUT 10mA/DIV VOUT 2V/DIV 100s/DIV Figure 15. tdON Response 500ns/DIV Figure 16. tdOFF Response CIN = 10F COUT = 0.1F VIN = 3.3V RL = 500 VON 2V/DIV IOUT 10mA/DIV
CIN = 10F COUT = 0.1F VIN = 3.3V RL = 500
VIN 2V/DIV
CIN = 10F RSET = 392
VIN = VON 2V/DIV
CIN = 10F VIN = VON = 3.3V VOUT = GND
IOUT 5A/DIV VOUT 2V/DIV
IOUT 500mA/DIV
20s/DIV Figure 17. Short Circuit Response Time (Output shorted to GND)
20s/DIV Figure 18. Current Limit Response Time (Switch is powered into a short)
FPF2163/4/5 Rev. I
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FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
Typical Characteristics
VIN 2V/DIV VON 2V/DIV IOUT 500mA/DIV VOUT 2V/DIV 50s/DIV Figure 19. Current Limit Response Time (Output is loaded by 2.2, COUT = 0.1F) VIN 2V/DIV VON 2V/DIV IOUT 500mA/DIV VOUT 2V/DIV 50s/DIV Figure 20. Current Limit Response Time (Output is loaded by 2.2, COUT = 10F)
CIN = 10F COUT = 0.1F RSET = 392 VIN = 3.3V
CIN = 10F COUT = 10F RSET = 392 VIN = 3.3V
Note 2: VDRV signal forces the device to go into overcurrent condition by loading.
FPF2163/4/5 Rev. I
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FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
Description of Operation
The FPF2163, FPF2164, and FPF2165 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 0.12 P-channel MOSFET and a controller capable of functioning over a wide input operating range of 1.85.5V. The controller protects against system malfunctions through current limiting, undervoltage lockout and thermal shutdown. The current limit is adjustable from 150mA to 1.5A through the selection of an external resistor.
switch is loaded with a heavy load. When the output voltage drops below VSCTH, short circuit detection threshold voltage, the current limit value re-conditioned and short circuit current limit value is decreased to 62.5% of the current limit value. This keeps the power dissipation of the part below a certain limit even at dead short conditions at 5.5V input voltage. The VSCTH value is set to be 1V. At around 1.1V of output voltage the switch is removed from short circuit current limiting mode and the current limit is set to the current limit value.
Undervoltage Lockout
The undervoltage lockout turns-off the switch if the input voltage drops below the undervoltage lockout threshold. With the ON pin active the input voltage rising above the undervoltage lockout threshold will cause a controlled turn-on of the switch which limits current over-shoots.
On/Off Control
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 undervoltage 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 FPF2163 and FPF2164. The FPF2163 has an Auto-Restart feature which will automatically turn the switch on again after 450ms. For the FPF2164, the ON pin must be toggled to turn-on the switch again. The FPF2165 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 undervoltage lockout have not activated. The ON pin control voltage and VIN pin have independent recommended operating ranges. The ON pin voltage can be driven by a voltage level higher than the input voltage.
Reverse Current Blocking
The entire FPF2163/65 family has a Reverse Current Blocking feature that protects input source against current flow from output to input. For a standard USB power design, this is an important feature which protects the USB host from being damaged due to reverse current flow on VBUS. The reverse current blocking feature is active when the load switch is turned off. If ON pin is LO and output voltage become greater than input voltage, no current can flow from the output to the input . The FLAGB operation is independent of the Reverse Current blocking feature and will not report a fault condition if this feature is activated.
Fault Reporting
Upon the detection of an over-current, an input undervoltage, or an over-temperature condition, the FLAGB signals the fault mode by activating LO. For the FPF2163 and FPF2164, the FLAGB goes LO at the end of the blanking time while FLAGB goes LO immediately for the FPF2165. FLAGB remains LO through the Auto-Restart Time for the FPF2165. For the FPF2164, FLAGB is latched LO and ON must be toggled to release it. With the FPF2165, 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 VIN and FLAGB. During shutdown, the pull-down on FLAGB is disabled to reduce current draw from the supply.
Thermal Shutdown
The thermal shutdown protects the die 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 temperature of the die drops below the threshold temperature.
Timing Diagram
90%
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 FPF2163 and FPF2164 have a blanking time of 30ms, 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 FPF2165 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. For preventing the switch from large power dissipation during heavy load a short circuit detection feature is introduced. Short circuit condition is detected by observing the output voltage. The switch is put into short circuit current limiting mode if the
VON
10%
90%
90% 10%
VOUT
10%
tdON
tR
tdOFF
tF
tON
tOFF
where: tdON tR tON tdOFF tF tOFF
= = = = = =
Delay On Time VOUT Rise Time Turn On Time Delay Off Time VOUT Fall Time Turn Off Time
FPF2163/4/5 Rev. I
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FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
Application Information
Typical Application
VIN Battery 1.8V-5.5V
FPF2163/4/5
VOUT
LOAD
FLAGB OFF ON C1 = 4.7F RSET ON GND ISET C2 = 0.1F R2 = 499
Setting Current Limit
The FPF2163, FPF2164, and FPF2165 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 = 275.6 ILIM (1)
Input Capacitor
To limit the voltage drop on the input supply caused by transient in-rush 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 4.7F ceramic capacitor, CIN, must be placed close to the VIN pin. A higher value of CIN can be used to further reduce the voltage drop experienced as the switch is turned on into a large capacitive load.
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 394. This will ensure that the port load could draw 525mA, but not more than 875mA. Likewise for a dual port system, an RSET of 185 would always deliver at least 1125mA and never more than 1875mA
Output Capacitor
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 FPF2163 and FPF2164, 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) x tBLANK(min) VIN (2)
Current Limit Various RSET Values
RSET [] 185 220 275 306 345 394 460 550 610 690 790 920 1100 1380 1830 Min. Current Limit [mA] 1125 938 750 675 600 525 450 375 338 300 263 225 188 150 113 Typ. Current Limit [mA] 1500 1250 1000 900 800 700 600 500 450 400 350 300 250 200 150 Max. Current Limit [mA] 1875 1562 1250 1125 1000 875 750 625 563 500 438 375 313 250 188
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 power dissipation of, P = (ILIM)2 x RDS = (1.5)2 x 0.12 = 270mW (3)
If the part goes into current limit the maximum power dissipation will occur when the output is shorted to ground. For the FPF2163, the power dissipation will scale by the Auto-Restart Time, tRSTRT, and the Over Current Blanking Time, tBLANK, so that the maximum power dissipated is, tBLANK P(max) = x VIN(max) x ILIM(max) tBLANK + tRSTRT = 30 x 5.5 x 1.5 = 515.6mW 30 + 450 (4)
FPF2163/4/5 Rev. I
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FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
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 FPF2164, attention must be given to the manual resetting of the part. 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 FPF2165, 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) = VIN(max) x ILIM(max) = 5.5 x 1.5 = 8.25W 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. The middle pad (pin 7) should be connected to the GND plate of PCB for improving thermal performance of the load switch. An improper layout could result higher junction temperature and triggering the thermal shutdown protection feature. This concern applies when the switch is set at higher current limit value and an overcurrent condition occurs. In this case power dissipation of the switch (PD = (VIN - VOUT) x ILIM(max)) could exceed the maximum absolute power dissipation of 1.2W.
FPF2163/4/5 Rev. I
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FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
Dimensional Outline and Pad Layout
FPF2163/4/5 Rev. I
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FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
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Rev. I37
2.
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