Fairchild FPF2194 Full-function load switch with adjustable current limit Datasheet

FPF2193 / FPF2194 / FPF2195
Full-Function Load Switch with Adjustable Current Limit
Description
Features
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The FPF2193, FPF2194, and FPF2195 form a series of
load switches that provides full protection to systems
and loads that may encounter large current conditions.
These devices contain a 55 mΩ current-limited Pchannel MOSFET that can operate over an input voltage
range of 1.8 to 5.5 V. 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 that shuts off the switch to prevent
damage to the part when a continuous over-current
condition causes excessive heating.
<1.8 to 5.5 V Input Voltage Range
Controlled Turn-On
0.1 to 1.5 A Adjustable Current Limit
Under-Voltage Lockout
Thermal Shutdown
<2 µA Shutdown Current
Auto Restart
Fast Current Limit Response Time
5 µs to Moderate Over Currents
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
FPF2193 and FPF2194, if the constant current condition
still persists after 30 ms, the parts shut off the switch
and pull the fault signal pin (FLAGB) LOW. The
FPF2193 has an auto-restart feature that turns the
switch on again after 450 ms if the ON pin is still active.
The FPF2194 does not have this auto-restart feature, so
the switch remains off until the ON pin is cycled. The
FPF2195 does not turn off after a current limit fault, but
remains in the constant-current mode indefinitely. The
minimum current limit is 100 mA.
30 ns to Hard Shorts
Fault Blanking
Reverse Current Blocking
Applications
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PDAs
Cell Phones
Handheld GPS Devices
These parts are available in a space-saving six ball
advanced 1 x 1.5 mm WLCSP package.
Portable Enterprise / Industrial Devices
Digital Cameras
Peripheral Ports and Accessories
Portable Medical Equipment
Hot Swap Supplies
Ordering Information
Part
Number
Current
Limit [mA]
FPF2193
FPF2194
100-1500
FPF2195
© 2009 Fairchild Semiconductor Corporation
FPF2193/4/5 • Rev. 1.0.5
Current Limit Blanking
Time [ms]
Auto-Restart
Time [ms]
15/30/60
225/450/900
15/30/60
NA
0
NA
ON Pin
Activity
Top Mark
Active HIGH
S7
S6
S9
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FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit
December 2012
Figure 1.
Typical Application
Block Diagram
Figure 2.
© 2009 Fairchild Semiconductor Corporation
FPF2193/4/5 • Rev. 1.0.5
FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit
Application Diagram
Functional Block Diagram
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2
Figure 3.
1.0 x 1.5 mm Chip-Scale Package
Figure 4.
Pin Configuration (Bottom View)
Pin Definitions
Pin #
Name
Description
C1
ISET
Current Limit Set Input. A resistor from ISET to ground sets the current limit for the switch.
B2
VIN
Supply Input. Input to the power switch and the supply voltage for the IC.
B1
VOUT
A1
FLAGB
C2
GND
A2
ON
FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit
Pin Configuration
Switch Output. Output of the power switch.
Fault Output. Active LOW, open-drain output that indicates an over-current supply, undervoltage, or over-temperature state.
Ground.
ON control input, active HIGH.
© 2009 Fairchild Semiconductor Corporation
FPF2193/4/5 • Rev. 1.0.5
www.fairchildsemi.com
3
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be
operable above the recommended operating conditions and stressing the parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.
Symbol
Parameter
VIN, VOUT, ON, FLAGB, ISET to GND
PD
TJ
Min.
Max.
Unit
-0.3
6.0
V
1.2
W
(1)
Power Dissipation at TA = 25°C
Operating Temperature Range
-40
+125
°C
TSTG
Storage Temperature
-65
+150
°C
ΘJA
Thermal Resistance, Junction to Ambient
85
°C/W
ESD
Electrostatic Discharge Capability
Human Body Model, JESD22-A114
8000
Machine Model, JESD22-A115
400
V
Notes:
1. Package power dissipation on one-square inch pad, two-ounce copper board.
Recommended Operating Conditions
The Recommended Operating Conditions table defines the conditions for actual device operation. Recommended
operating conditions are specified to ensure optimal performance to the datasheet specifications. Fairchild does not
recommend exceeding them or designing to Absolute Maximum Ratings.
Symbol
Parameter
Min.
Max.
Unit
VIN
Input Voltage
1.8
5.5
V
TA
Ambient Operating Temperature
-40
+85
°C
© 2009 Fairchild Semiconductor Corporation
FPF2193/4/5 • Rev. 1.0.5
FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit
Absolute Maximum Ratings
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4
VIN = 1.8 to 5.5 V, TA = -40 to +85°C unless otherwise noted. Typical values are at VIN = 3.3 V and TA = 25°C.
Symbol
Parameter
Conditions
Min.
Typ.
Max.
Units
5.5
V
Basic Operation
VIN
IQ
Operating Voltage
Quiescent Current
RON
On Resistance
VIH
On Input Logic High Voltage
ON
VIL
On Input Logic Low Voltage
1.8
VIN=1.8 V
70
IOUT=0 mA, VON=VIN VIN=3.3 V
75
VIN=5.5 V
80
TA=25°C, IOUT=200 mA
55
TA=-40 to 85°C, IOUT=200 mA
µA
80
135
VIN=1.8 V
0.8
VIN=5.5 V
1.4
V
VIN=1.8 V
0.5
VIN=%.5 V
1.0
On Input Leakage
VON=VIN or GND
-1
VIN Shutdown Current
VON=0 V, VIN=5.5 V,
VOUT=Short to GND
-2
mΩ
0
V
1
µA
2
µA
VFLB_L
FLAGB Output Logic Low
Voltage
VIN=5 V, ISINK=10 mA
0.05
0.20
VIN=1.8, ISINK=10 mA
0.12
0.30
VFLB_H
FLAGB Output Logic High
Leakage Current
VIN=5 V, Switch ON
V
1
µA
2
µA
Reverse Block
ISDT
Vbreakdown
VOUT Shutdown Current
VON=0 V, VOUT=5.5 V,
VIN=Short-to-GND
Reverse Breakdown Voltage
VIN=VON=0 V, IOUT=200 µA
-2
9
V
Protections
ILIM
ILIM(MIN)
TSD
Current Limit
VIN=3.3 V, VOUT=3.0 V, RSET=690 Ω
Minimum Current Limit
VIN=3.3 V, VOUT=3.0 V
100
Shutdown Threshold
140
Return from Shutdown
130
Hysteresis
10
Thermal Shutdown
VUVLO
Under-Voltage Lockout
VUVLO_HYST
Under-Voltage Lockout
Hysteresis
VIN Increasing
600
1.55
800
1.65
1000
mA
ma
°C
1.75
V
50
mV
Dynamic
tdON
Delay On Time
RL=500 Ω, CL=0.1 µF
20
µs
tR
VOUT Rise Time
RL=500 Ω, CL=0.1 µF
20
µs
tON
Turn-On Time
RL=500 Ω, CL=0.1 µF
40
µs
tdOFF
Delay Off Time
RL=500 Ω, CL=0.1 µF
15
µs
tF
VOUT Fall Time
RL=500 Ω, CL=0.1 µF
110
µs
µs
Turn-Off Time
RL=500 Ω, CL=0.1 µF
tBLANK
Over-Current Blanking Time
FPF2193, FPF2194
15
30
60
tRSTRT
Auto-Restart
FPF2193
225
450
900
tOFF
tSC
Short-Circuit Response Time
© 2009 Fairchild Semiconductor Corporation
FPF2193/4/5 • Rev. 1.0.5
FPF2194, FPF2195
125
NA
FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit
Electrical Characteristics
ms
ms
VIN=VOUT=3.3 V, Moderate OverCurrent Condition
5
µs
VIN=VOUT=3.3 V, Hard Short
30
ns
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5
Figure 5.
Quiescent Current vs. Input Voltage
Figure 7.
Quiescent Current vs. Temperature
Figure 9.
VON Low Voltage vs. Input Voltage
© 2009 Fairchild Semiconductor Corporation
FPF2193/4/5 • Rev. 1.0.5
Figure 6.
Figure 8.
Figure 10.
Quiescent Current vs. Input Voltage
VON High Voltage vs. Input Voltage
FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit
Typical Performance Characteristics
Current Limit vs. Output Voltage
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6
Figure 11.
Current Limit vs. Temperature
Figure 13.
Figure 15.
Figure 12.
RON vs. Temperature
Figure 14.
tRISE / tFALL vs. Temperature
© 2009 Fairchild Semiconductor Corporation
FPF2193/4/5 • Rev. 1.0.5
Figure 16.
RON vs. VIN
tON / tOFF vs. Temperature
FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit
Typical Performance Characteristics (Continued)
tRSTRT vs. Temperature
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7
Figure 17.
tBLANK vs.Temperature
Figure 19.
Figure 21.
Figure 18.
tOFF Response
Figure 20.
Current Limit Response Time
(Switch is Powered into a Short)
© 2009 Fairchild Semiconductor Corporation
FPF2193/4/5 • Rev. 1.0.5
tON Response
Short-Circuit Response Time
(Output Shorted to GND)
FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit
Typical Performance Characteristics (Continued)
Figure 22. Current Limit Response Time
(Output is Loaded by 2.2 Ω, COUT=0.1 µF)
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8
Figure 23. Current Limit Response Time
(Output is Loaded by 2.2 Ω, COUT=10 µF)
Figure 25.
Figure 24.
tBLANK vs. Response(3)
(2)
Short-Circuit Detection Function
Figure 26.
tRESTART vs. Response(3)
Notes:
2. When the output voltage is below VSCTH=1.1 V, the current limit value is set at 62.5% of the current limit value.
3. VDRV signal forces the device to go into over-current condition by loading.
© 2009 Fairchild Semiconductor Corporation
FPF2193/4/5 • Rev. 1.0.5
FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit
Typical Performance Characteristics (Continued)
www.fairchildsemi.com
9
The FPF2193, FPF2194, and FPF2195 are current-limited
switches that protect systems and loads that can be
damaged or disrupted by the application of high currents.
The core of each device is a 55 mΩ P-channel MOSFET
and a controller capable of functioning over the wide input
operating range of 1.8- 5.5 V. The controller protects
against system malfunctions through current limiting,
under-voltage lockout, and thermal shutdown. The current
limit is adjustable from 100 mA to 1.5 A through the
selection of an external resistor.
heavy load. When the output voltage drops below VSCTH,
the short-circuit detection threshold voltage, the current
limit value is re-conditioned and the short-circuit currentlimit 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 5.5 V input
voltage. The VSCTH value is set to be 1 V. At around 1.1 V
of output voltage, the switch is removed from short-circuit
current-limiting mode and the current limit is set to the
current limit value.
On/Off Control
Under-Voltage Lockout (UVLO)
The under-voltage lockout turns the switch off 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 causes a controlled turnon of the switch, which limits current over shoot.
The ON pin controls the state of the switch. When ON is
HIGH, the switch is in 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 cause the switch to turn off in the FPF2193 and
FPF2194. The FPF2193 has an auto-restart feature that
automatically turns the switch on again after 450 ms. For
the FPF2194, the ON pin must be toggled to turn the
switch on again. The FPF2195 does not turn off in
response to an over-current condition, but remains
operating in constant-current mode as long as ON is
active and the thermal shutdown or under-voltage lockout
have not activated.
Thermal Shutdown
The thermal shutdown protects the die from internally or
externally generated excessive temperatures. During an
over-temperature condition, 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.
Reverse-Current Blocking
Current Limiting
The entire FPF2193/94/95 family has a reverse current
blocking feature that protects the input source against
current flow from output to input. For a standard USB
power design, this is an important feature to protect the
USB host from being damaged due to reverse current flow
on VBUS.
When the load switch is OFF, no current flows from the
output to the input. If the switch is turned on and the
output voltage is greater than input voltage, this feature is
activated and turns off the switch. This prevents any
current flow from output to input. The reverse-current
blocking feature is deactivated if the VOUT - VIN is smaller
than a typically 50 mV threshold. During this time, some
current (50 mV/RON) flows from the output to input until
input voltage becomes greater than output voltage.
FLAGB operation is independent of the reverse-current
blocking and does not report a fault condition if this
feature is activated.
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 limit is adjustable through the selection of an
external resistor connected to ISET. Information for
selecting the resistor is found in the Application
Information section. The FPF2193 and FPF2194 have a
blanking time of 30 ms, nominally, during which the switch
acts as a constant current source. At the end of the
blanking time, the switch is turned off. The FPF2195 has
no current limit blanking period, so it remains 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 shortcircuit current-limiting mode if the switch is loaded with a
Figure 27.
where:
tdON = Delay On Time
tR = VOUT Rise Time
tON = Turn-On Time
tdOFF = Delay Off Time
tF = VOUT Fall Time
tOFF = Turn-Off Time
Fault Reporting
Upon the detection of an over-current, input undervoltage, or over-temperature condition, FLAGB signals the
fault mode by activating LOW. For the FPF2193 and
FPF2194, the FLAGB goes LOW at the end of the
blanking time, while FLAGB goes LOW immediately for
the FPF2195. FLAGB remains LOW through the autorestart time for the FPF2195. For the FPF2194, FLAGB is
latched LOW and ON must be toggled to release it. With
the FPF2195, FLAGB is LOW during the faults and
immediately returns HIGH at the end of the fault condition.
FLAGB is an open-drain MOSFET that 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.
© 2009 Fairchild Semiconductor Corporation
FPF2193/4/5 • Rev. 1.0.5
FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit
Functional Description
Timing Diagram
www.fairchildsemi.com
10
Figure 28.
Typical Application
Input Capacitor
Setting Current Limit
To limit the voltage drop on the input supply caused by
transient inrush 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
0.1 µF ceramic capacitor, CIN, placed close to the pins is
usually sufficient. Higher values of CIN can be used to
further reduce the voltage drop.
The FPF2193, FPF2194, and FPF2195 current limit is
set with an external resistor connected between ISET and
GND. This resistor is selected using the following
equation:
RSET =
551.6
ILIM
(1)
Output Capacitor
RSET is in Ω and ISET is in Amps.
A 0.1 µF capacitor, COUT, should be placed between
VOUT and GND. This capacitor prevents parasitic board
inductances from forcing VOUT below GND when the
switch turns off. For the FPF2193 and FPF2194, 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:
Table 1 can also be used to select RSET. A typical
application would be the 500 mA current required by a
single USB port. Using Table 1, an appropriate selection
for the RSET resistor would be 788 Ω. This ensures that
the port load could draw 525 mA, but not more than
875 mA. Likewise for a dual-port system; an RSET of
368 Ω always delivers at least 1125 mA and never more
than 1875 mA.
Table 1.
Current Limit Various RSET Values
Min. Current
RSET(Ω)
Limit (mA)
Typ. Current
Limit (mA)
Max. Current
Limit (mA)
COUT (max) =
ILIM(max)× t BLANK (min)
VIN
(2)
368
1125
1500
1875
Power Dissipation
441
928
1250
1562
552
750
1000
1250
613
675
900
1125
690
600
800
1000
During normal operation as a switch, the power
dissipated depends upon the level at which the current
limit is set. The maximum allowed setting for the current
limit is 1.5 A and results in a power dissipation of:
788
525
700
875
919
450
600
750
1103
375
500
625
1226
338
450
563
1379
300
400
500
1576
263
350
438
1839
225
300
375
2206
188
250
313
2758
150
200
250
3677
113
150
188
5516
75
100
125
© 2009 Fairchild Semiconductor Corporation
FPF2193/4/5 • Rev. 1.0.5
P = (ILIM )2 × RON = (1.5)2 × 0.055 = 123.75mW
FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit
Application Information
(3)
If the part goes into current limit, the maximum power
dissipation occurs when the output is shorted to ground.
For the FPF2193, the power dissipation scales by the
auto-restart time, tRSTRT, and the over-current blanking
time, tBLANK, so that the maximum power dissipated is:
P(max) =
tBLANK
× VIN (max)× ILIM(max)
t BLANK + t RSTRT
30
=
× 5.5 × 1.5 = 515.6mW
30 + 450
(4)
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11
P(max) = VIN (max) × ILIM (max)
= 5.5 × 1.5 = 8.25W
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 help to minimize
parasitic electrical effects along with minimizing the
case-to-ambient thermal impedance.
(5)
This large amount of power activates the thermal
shutdown and the part cycles in and out of thermal
shutdown as long as the ON pin is active and the short
is present.
.
© 2009 Fairchild Semiconductor Corporation
FPF2193/4/5 • Rev. 1.0.5
FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit
This is more power than the package can dissipate, but
the thermal shutdown of the part activates to protect the
part from damage due to excessive heating. When using
the FPF2194, attention must be given to the manual
resetting of the part. The junction temperature is only
able to increase to the thermal shutdown threshold.
Once this temperature has been reached, toggling ON
does not turn the switch on until the junction
temperature drops. For the FPF2195, a short on the
output causes the part to operate in a constant-current
state, dissipating a worst-case power of:
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12
0.03 C
E
2X
F
A
(Ø0.350)
SOLDER MASK
OPENING
B
(Ø0.250)
Cu Pad
A1
(1.00)
BALL A1
INDEX AREA
D
(0.50)
0.03 C
2X
TOP VIEW
RECOMMENDED LAND PATTERN
(NSMD PAD TYPE)
0.06 C
0.625
0.539
0.05 C
C
0.332±0.018
0.250±0.025
E
SEATING PLANE
D
SIDE VIEWS
NOTES:
A. NO JEDEC REGISTRATION APPLIES.
0.005
Ø0.315 +/- .025
6X
0.50
C
1.00
B
A
0.50
(Y) ±0.018
1 2
F
(X) ±0.018
BOTTOM VIEW
Figure 29.
C A B
B. DIMENSIONS ARE IN MILLIMETERS.
C. DIMENSIONS AND TOLERANCE
PER ASMEY14.5M, 1994.
D. DATUM C IS DEFINED BY THE SPHERICAL
CROWNS OF THE BALLS.
E. PACKAGE NOMINAL HEIGHT IS 582 MICRONS
±43 MICRONS (539-625 MICRONS).
F. FOR DIMENSIONS D, E, X, AND Y SEE
PRODUCT DATASHEET.
G. DRAWING FILNAME: MKT-UC006AFrev2.
6-Ball, Wafer-Level Chip-Scale Package (WLCSP)
Product
D
E
X
Y
FPF2193
1.500±0.030
1.000±0.030
0.240
0.240
FPF2194
1.500±0.030
1.000±0.030
0.240
0.240
FPF2195
1.500±0.030
1.000±0.030
0.240
0.240
FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit
Physical Dimensions
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the
warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/packaging/.
© 2009 Fairchild Semiconductor Corporation
FPF2193/4/5 • Rev. 1.0.5
www.fairchildsemi.com
13
FPF2193 / FPF2194 / FPF2195 — Full Function Load Switch with Adjustable Current Limit
© 2009 Fairchild Semiconductor Corporation
FPF2193/4/5 • Rev. 1.0.5
www.fairchildsemi.com
14
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