Fairchild FPF2163 Full function load switch with adjustable current limit Datasheet

FPF2163/4/5
Full Function Load Switch with Adjustable Current Limit
tm
Features
General Description
„ 1.8 to 5.5V Input Voltage Range
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 0.12Ω 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.
„ Controlled Turn-On
„ 0.15-1.5A Adjustable Current Limit
„ Undervoltage Lockout
„ Thermal Shutdown
„ <2uA Shutdown Current
„ Auto Restart
„ Fast Current limit Response Time
„ 5us to Moderate Over Currents
„ 30ns 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 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.
„ Reverse Current Blocking
„ RoHS Compliant
Applications
„ PDAs
„ Cell Phones
„ GPS Devices
„ MP3 Players
„ Digital Cameras
„ Peripheral Ports
These parts are available in a space-saving 6 pin 2X2 MLP
package.
„ Hot Swap Supplies
Pin 1
BOTTOM
TOP
Ordering Information
Part
Current Limit
[mA]
Current Limit
Blanking Time
[ms]
Auto-Restart
Time
[ms]
ON Pin
Activity
Top
Mark
FPF2163
150-1500
15/30/60
225/450/900
Active HI
163
FPF2164
150-1500
15/30/60
NA
Active HI
164
FPF2165
150-1500
0
NA
Active HI
165
©2007 Fairchild Semiconductor Corporation
FPF2163/4/5 Rev. C3
1
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FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
July 2007
FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
Typical Application Circuit
TO LOAD
VIN
VOUT
FPF2163/4/5
FLAGB
OFF ON
ON
ISET
GND
Functional Block Diagram
VIN
UVLO
REVERSE
CURRENT
BLOCKING
CONTROL
LOGIC
ON
CURRENT
LIMIT
VOUT
ISET
THERMAL
SHUTDOWN
FLAGB
GND
FPF2163/4/5 Rev. C3
2
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ON
6
1
ISET
GND
5
2
VIN
FLAGB
4
3
VOUT
2X2 MicroFET-6
Pin Description
Pin
Name
1
ISET
2
VIN
3
VOUT
4
FLAGB
5
GND
6
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
Min.
VIN, VOUT, ON, FLAGB, ISET to GND
Max.
-0.3
Power Dissipation
Operating and Storage Junction Temperature
-65
Thermal Resistance, Junction to Ambient
Electrostatic Discharge Protection
Unit
6
V
1.2
W
150
°C
86
°C/W
HBM
4000
V
MM
400
V
Recommended Operating Range
Parameter
Min.
Max.
Unit
VIN
1.8
5.5
V
Ambient Operating Temperature, TA
-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
5.5
V
63
100
Basic Operation
Operating Voltage
1.8
VIN
VIN = 1.8V
Quiescent Current
IQ
On-Resistance
RON
ON Input Logic High Voltage (ON)
VIH
FPF2163/4/5 Rev. C3
IOUT = 0mA
VIN = 3.3V
68
VIN = 5.5V
77
120
TA = 25°C, IOUT = 200mA
120
160
TA = -40 to +85°C, IOUT = 200mA
135
VIN = 1.8V
0.8
VIN = 5.5V
1.4
3
µA
mΩ
V
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FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
Pin Configuration
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
ON Input Logic Low Voltage
Symbol
VIL
Conditions
Min.
Typ.
Max.
VIN = 1.8V
0.5
VIN = 5.5V
1
Units
V
ON Input Leakage
VON = VIN or GND
-1
1
µA
VIN Shutdown Current
VON = 0V, VIN = 5.5V,
VOUT = short to GND
-2
2
µA
FLAGB Output Logic Low Voltage
VIN = 5V, ISINK = 10mA
0.05
0.2
VIN = 1.8V, ISINK = 10mA
0.12
0.3
VIN = 5V, Switch on
FLAGB Output High Leakage Current
V
1
µA
2
µA
1000
mA
Reverse Block
VON = 0V, VOUT = 5.5V,
VIN = short to GND
VOUT Shutdown Current
-2
Protections
Current Limit
ILIM
Min. Current Limit
ILIM(min.)
Thermal Shutdown
Under Voltage Shutdown
UVLO
VIN = 3.3V, VOUT = 3.0V, RSET = 345Ω
600
800
VIN = 3.3V, VOUT = 3.0V
150
Shutdown Threshold
140
Return from Shutdown
130
Hysteresis
10
VIN Increasing
1.55
Under Voltage Shutdown Hysteresis
1.65
mA
°C
1.75
V
50
mV
Dynamic
Turn on time
tON
RL = 500Ω, CL = 0.1µF
25
µs
Turn off time
tOFF
RL = 500Ω, CL = 0.1µF
45
µs
VOUT Rise Time
tRISE
RL = 500Ω, CL = 0.1µF
10
µs
VOUT Fall Time
tFALL
RL = 500Ω, CL = 0.1µF
Over Current Blanking Time
tBLANK
FPF2163, FPF2164
15
30
60
ms
Auto-Restart Time
tRSTRT
FPF2163
225
450
900
ms
Short Circuit Response Time
110
µs
VIN = VOUT = 3.3V. Moderate
Over-Current Condition.
5
µs
VIN = VOUT = 3.3V. Hard Short.
30
ns
Note 1: Package power dissipation on 1square inch pad, 2 oz copper board.
FPF2163/4/5 Rev. C3
4
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FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
Electrical Characteristics Cont.
100
78
SUPPLY CURRENT (uA)
SUPPLY CURRENT (uA)
95
76
74
72
70
68
90
85
80
VIN = 5.5V
75
VIN = 3.3V
70
VIN = 1.8V
65
60
55
66
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
50
6
-40
SUPPLY VOLTAGE (V)
35
60
85
Figure 2. Quiescent Current vs. Temperature
1.5
1.2
1.4
1.1
1.3
VON LOW VOLTAGE (V)
VON HIGH VOLTAGE (V)
10
TJ, JUNCTION TEMPERATURE (°C)
Figure 1. Quiescent Current vs. Input Voltage
1.2
1.1
1
0.9
0.8
1
0.9
0.8
0.7
0.6
0.7
0.5
0.6
1.5
2
2.5
3
3.5
4
4.5
SUPPLY VOLTAGE (V)
5
5.5
1.5
6
2
2.5
3
3.5
4
4.5
5
5.5
6
SUPPLY VOLTAGE (V)
Figure 4. VON Low Voltage vs. Input Voltage
Figure 3. VON High Voltage vs. Input Voltage
240
200
190
220
180
170
200
160
180
R(ON) (mOhms)
R(ON) (mOhms)
-15
150
140
130
120
110
VIN = 1.8V
160
140
VIN = 3.3V
120
100
100
VIN = 5.5V
80
90
80
60
1
2
3
4
5
6
-40
SUPPLY VOLTAGE(V)
Figure 5. R(ON) vs. VIN
FPF2163/4/5 Rev. C3
-15
10
35
TJ, JUNCTION TEMPERATURE (°C)
60
85
Figure 6. R(ON) vs. Temperature
5
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FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
Typical Characteristics
900
900
VIN = 5.5V
RSET = 345 Ohms
880
SUPPLY CURRENT ( mA)
OUTPUT CURRENT (mA)
800
700
600
500
400
300
200
100
860
840
820
800
780
760
740
720
700
0
0
1
2
3
4
5
-65
6
-40
-15
VIN - VOUT (V)
10
35
60
85
110
135
TJ, JUNCTION TEMPERATURE (°C)
Figure 7. Current Limit vs. Output Voltage
Figure 8. Current Limit vs. Temperature
1000
100
VIN = 3.3 V
RL = 500 Ohms
TURN-ON/OFF TIMES (mS)
TURN-ON/OFF TIMES (mS)
VIN = 3.3 V
RL = 500 Ohms
COUT = 0.1uF
TOFF
TON
10
-40
-15
10
35
60
TF
100
TR
10
1
85
-40
-15
TJ, JUNCTION TEMPERATURE (°C)
Figure 9. TON / TOFF vs. Temperature
10
35
TJ, JUNCTION TEMPERATURE (°C)
60
85
Figure 10. TRISE / TFALL vs. Temperature
33
500
495
32.5
RESTART TIME (mS)
BLANK TIME (mS)
490
32
31.5
31
30.5
485
480
475
470
465
460
30
455
450
29.5
-40
-15
10
35
TJ, JUNCTION TEMPERATURE (°C)
60
-40
85
10
35
60
85
TJ, JUNCTION TEMPERATURE (°C)
Figure 11. TBLANK vs. Temperature
FPF2163/4/5 Rev. C3
-15
Figure 12. TRESTART vs. Temperature
6
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FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
Typical Characteristics
VDRV2
2V/DIV
VDRV2
2V/DIV
TBLANK
VON
2V/DIV
IOUT
500mA/DIV
IOUT
500mA/DIV
CIN = 10µF COUT = 0.1µF
RL = 500Ω RSET = 392Ω
VIN = 3.3V
VOUT
2V/DIV
TRESTART
VON
2V/DIV
CIN = 10µF COUT = 0.1µF
RL = 500Ω RSET = 392Ω
VIN = 3.3V
VOUT
2V/DIV
20ms/DIV
100ms/DIV
Figure 13. TBLANK Response
Figure 14. TRESTART Response
VIN
2V/DIV
VON
2V/DIV
VON
2V/DIV
CIN = 10µF
COUT = 0.1µF
VIN = 3.3V
RL = 500Ω
IOUT
10mA/DIV
CIN = 10µF
COUT = 0.1µF
VIN = 3.3V
RL = 500Ω
IOUT
10mA/DIV
VOUT
2V/DIV
100µs/DIV
500ns/DIV
Figure 15. TON Response
Figure 16. TOFF Response
VIN
2V/DIV
VIN = VON
2V/DIV
CIN = 10µF
RSET = 392Ω
IOUT
5A/DIV
CIN = 10µF
VIN = VON = 3.3V
VOUT = GND
IOUT
500mA/DIV
VOUT
2V/DIV
20µs/DIV
20µs/DIV
Figure 17. Short Circuit Response Time
(Output shorted to GND)
FPF2163/4/5 Rev. C3
Figure 18. Current Limit Response Time
(Switch is powered into a short)
7
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FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
Typical Characteristics
VIN
2V/DIV
VIN
2V/DIV
CIN = 10µF
COUT = 0.1µF
RSET = 392Ω
VIN = 3.3V
VON
2V/DIV
CIN = 10µF
COUT = 10µF
RSET = 392Ω
VIN = 3.3V
VON
2V/DIV
IOUT
500mA/DIV
IOUT
500mA/DIV
VOUT
2V/DIV
VOUT
2V/DIV
50µs/DIV
50µs/DIV
Figure 20. Current Limit Response Time
(Output is loaded by 2.2Ω, COUT = 10µF)
Figure 19. Current Limit Response Time
(Output is loaded by 2.2Ω, COUT = 0.1µF)
Note 2: VDRV signal forces the device to go into overcurrent condition by loading.
FPF2163/4/5 Rev. C3
8
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FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
Typical Characteristics
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
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.
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 0.12Ω 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, under-voltage lockout and thermal
shutdown. The current limit is adjustable from 150mA to 1.5A
through the selection of an external resistor.
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 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 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 under-voltage lockout have not activated.
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 undervoltage lockout threshold will cause a controlled turn-on of the
switch which limits current over-shoots.
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.
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 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.
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.
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.
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.
FPF2163/4/5 Rev. C3
9
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FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
Description of Operation
Typical Application
VIN
LOAD
VOUT
FPF2163/4/5
FLAGB
Battery
1.8V-5.5V
OFF ON
ON
R2 = 499Ω
ISET
C2 = 0.1µF
GND
C1 = 0.1µF
RSET
Setting Current Limit
Input Capacitor
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,
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 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.
275.6
R SET = --------------I LIM
(2)
Output Capacitor
RSET is in Ohms and that of ILIM is Amps
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,
I LIM ( max ) × t BLANK ( min )
C OUT ( max ) = --------------------------------------------------------------------------(1)
V IN
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 394Ω. This will ensure that the
port load could draw 525mA, but not more than 875mA.
Likewise for a dual port system, an RSET of 185Ω would always
deliver at least 1125mA and never more than 1875mA
Current Limit Various RSET Values
RSET
[Ω]
Min. Current
Limit
[mA]
Typ. Current
Limit
[mA]
Max. Current
Limit
[mA]
185
1125
1500
1875
220
938
1250
1562
275
750
1000
1250
306
675
900
1125
345
600
800
1000
394
525
700
875
460
450
600
750
550
375
500
625
610
338
450
563
690
300
400
500
790
263
350
438
920
225
300
375
1100
188
250
313
1380
150
200
250
1830
113
150
188
FPF2163/4/5 Rev. C3
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,
2
2
P = ( I LIM ) × R DS = ( 1.5 ) × 0.12 = 270mW (2)
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,
t BLANK
P ( max ) = ----------------------------------------------------- × V IN ( max ) × I LIM ( max )
t BLANK + t RSTRT
30
= ----------------------- × 5.5 × 1.5 = 515.6mW
30 + 450
10
(3)
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FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
Application Information
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,
P ( max ) = V IN ( max ) × I LIM ( max )
(4)
= 5.5 × 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.
FPF2163/4/5 Rev. C3
11
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FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
Dimensional Outline and Pad Layout
FPF2163/4/5 Rev. C3
12
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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.
2.
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, and (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.
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; supplementary data will be
published at a later date. Fairchild Semiconductor reserves the right to make
changes at any time without notice 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 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.
Rev. I30
FPF2163/4/5 Rev. C3
13
www.fairchildsemi.com
FPF2163/4/5 Full Function Load Switch with Adjustable Current Limit
TRADEMARKS
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