AAT AAT4280IGU-1-T1 Slew rate controlled load switch Datasheet

AAT4280
Slew Rate Controlled Load Switch
General Description
Features
The AAT4280 SmartSwitch is a P-channel MOSFET
power switch designed for high-side load switching
applications. The P-channel MOSFET device has a
typical RDS(ON) of 80mΩ, allowing increased load
switch power handling capacity. This device is available in three different versions with flexible turn on
and off characteristics from very fast to slew rate limited. The standard AAT4280 (-1) version has a slew
rate limited turn on load switch and is functionally
compatible with the AAT4250 device while offering
superior RDS(ON) characteristics. The AAT4280 (-2)
version features fast load switch turn on capabilities,
typically less than 500ns turn on and 3µs turn off
times. The AAT4280 (-3) variation offers a shutdown
load discharge circuit to rapidly turn off a load circuit
when the switch is disabled. All AAT4280 load switch
versions operate with an input voltage ranging from
1.8V to 5.5V, making them ideal for both 3V and 5V
systems. The AAT4280 also features an under-voltage lockout which turns the switch off when an input
under-voltage condition exists. Input logic levels are
TTL and 2.5V to 5V CMOS compatible. The quiescent supply current is very low, typically 2.5µA. In
shutdown mode, the supply current decreases to
less than 1µA.
•
•
•
•
•
•
•
•
•
SmartSwitch™
1.8V to 5.5V Input Voltage Range
Very Low RDS(ON), Typically 80mΩ (5V)
Slew Rate Limited Turn-On Time Options
— 1ms
— 0.5µs
— 100µs
Fast Shutdown Load Discharge Option
Low Quiescent Current
— 2.5µA Typical
— 1µA Max in Shutdown
TTL/CMOS Input Logic Level
Temperature Range: -40ºC to +85°C
4kV ESD Rating
6-Pin SOT23 or 8-Pin SC70JW Package
Applications
•
•
•
•
•
•
Cellular Telephones
Digital Still Cameras
Hot Swap Supplies
Notebook Computers
Personal Communication Devices
Personal Digital Assistants (PDA)
The AAT4280 is available in a Pb-free, 6-pin
SOT23 or 8-pin SC70JW package and is specified
over the -40°C to +85°C temperature range.
Typical Application
VIN
IN
IN
C IN
1μF
GND
4280.2006.11.1.4
ON
OUT
V OUT
AAT4280
ON/OFF
GND
GND
C OUT
0.1μF
GND
1
AAT4280
Slew Rate Controlled Load Switch
Pin Descriptions
Pin #
SOT23-6
SC70JW-8
Symbol
Function
1
2
OUT
This pin is the P-channel MOSFET drain connection.
Bypass to ground through a 0.1µF capacitor.
2, 5
4
GND
Ground connection.
3
3
ON/OFF
4, 6
1, 5, 6, 7, 8
IN
Enable input.
This pin is the input to the P-channel MOSFET source.
Bypass to ground through a 1.0µF capacitor.
Pin Configuration
SOT23-6
(Top View)
OUT
1
6
IN
GND
2
5
GND
ON/OFF
3
4
IN
SC70JW-8
(Top View)
IN
OUT
ON/OFF
GND
1
8
2
7
3
6
4
5
IN
IN
IN
IN
Selector Guide
2
Part Number
Slew Rate
(typ)
Active
Pull Down
AAT4280-1
1ms
Active High
AAT4280-2
0.5µs
Active High
AAT4280-3
100µs
√
Enable
Active High
4280.2006.11.1.4
AAT4280
Slew Rate Controlled Load Switch
Absolute Maximum Ratings1
TA = 25°C, unless otherwise noted.
Symbol
VIN
VON
VOUT
IMAX
Description
IN to GND
ON/OFF to GND
OUT to GND
Maximum Continuous Switch Current
IDM
Maximum Pulsed Current
TJ
TS
Operating Junction Temperature Range
Storage Temperature Range
Maximum Soldering Temperature (at leads)
ESD Rating2 - HBM
TLEAD
VESD
IN ≥ 2.5V
IN < 2.5V
Value
Units
-0.3 to 6
-0.3 to 6
-0.3 to VIN + 0.3
2.3
6
3
-40 to 150
-65 to 150
300
4000
V
V
V
A
A
A
°C
°C
°C
V
Thermal Characteristics3
Value
Symbol
ΘJA
PD
Description
Thermal Resistance
Power Dissipation
SOT23-6
SC70JW-8
Units
120
833
140
714
°C/W
mW
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at conditions other than the operating conditions specified is not implied. Only one Absolute Maximum Rating should be applied at any one time.
2. Human body model is a 100pF capacitor discharged through a 1.5kΩ resistor into each pin.
3. Mounted on an AAT4280 demo board in still 25ºC air.
4280.2006.11.1.4
3
AAT4280
Slew Rate Controlled Load Switch
Electrical Characteristics
VIN = 5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C.
Symbol
Description
AAT4280 All Versions
VIN
Operation Voltage
VUVLO
Under-Voltage Lockout
VUVLO(hys) Under-Voltage Lockout Hysteresis
IQ
Quiescent Current
IQ(OFF)
Off Supply Current
ISD(OFF)
Off Switch Current
RDS(ON)
TCRDS
VIL
VIH
On Resistance
On Resistance Temperature
Coefficient
ON/OFF Input Logic Low Voltage
ON/OFF Input Logic High Voltage
ISINK
ON/OFF Input Leakage
AAT4280-1
TD(ON)
Output Turn-On Delay
TON
Output Turn-On Rise Time
TD(OFF)
Output Turn-Off Delay Time
AAT4280-2
TD(ON)
Output Turn-On Delay
TON
Output Turn-On Rise Time
TD(OFF)
Output Turn-Off Delay Time
AAT4280-3
TD(ON)
Output Turn-On Delay
TON
Output Turn-On Rise Time
TD(OFF)
Output Turn-Off Delay Time
Output Pull-Down Resistance
RPD
During OFF
Conditions
Min
VIN Falling
1.81
1.0
ON/OFF = Active
ON/OFF = Inactive, OUT = Open
ON/OFF = Inactive, VOUT = 0
VIN = 5V, TA = 25°C
VIN = 4.2V, TA = 25°C
VIN = 3V, TA = 25°C
VIN = 1.8V, TA = 25°C
Typ
1.4
250
2.5
80
85
100
160
Max
Units
5.5
1.8
V
V
mV
µA
µA
µA
4
1
1
120
130
150
250
2800
VIN = 2.7V to 5.5V2
VIN = 2.7V to ≤ 4.2V
VIN = 3.3V
VIN = >4.2V to 5.5V
VON/OFF = 5.5V
mΩ
ppm/°C
0.8
2
1.8
2.4
V
V
1
µA
VIN = 5V, RLOAD = 10Ω, TA = 25°C
VIN = 5V, RLOAD = 10Ω, TA = 25°C
VIN = 5V, RLOAD = 10Ω, TA = 25°C
20
1000
4
40
1500
10
µs
µs
µs
VIN = 5V, RLOAD = 10Ω, TA = 25°C
VIN = 5V, RLOAD = 10Ω, TA = 25°C
VIN = 5V, RLOAD = 10Ω, TA = 25°C
0.5
0.5
4
2
1
10
µs
µs
µs
VIN = 5V, RLOAD = 10Ω, TA = 25°C
VIN = 5V, RLOAD = 10Ω, TA = 25°C
VIN = 5V, RLOAD = 10Ω, TA = 25°C
20
100
4
40
150
10
µs
µs
µs
ON/OFF = Inactive, TA = 25°C
150
250
Ω
1. Part requires minimum start-up of VIN ≥ 2.0V to ensure operation down to 1.8V.
2. For VIN outside this range, consult typical ON/OFF threshold curve.
4
4280.2006.11.1.4
AAT4280
Slew Rate Controlled Load Switch
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Quiescent Current vs. Temperature
Quiescent Current vs. Input Voltage
3.5
Quiescent Current (μA)
Quiescent Current (μA)
4
VIN = 5V
3
2
VIN = 3V
1
0
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-40
-20
0
20
40
60
80
100
0
1
2
Temperature (°C)
5
6
RDS(ON) vs. Temperature
120
190
2A
170
110
1A
500mA
150
130
110
RDS(ON) (mΩ)
RDS(ON) (mΩ)
4
Input Voltage (V)
RDS(ON) vs. Input Voltage
100mA
90
VIN = 3V
100
90
80
70
VIN = 5V
60
50
70
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
40
-40
Input Voltage (V)
-20
0
20
40
60
80
100
Temperature (°C)
ON/OFF Threshold vs. Input Voltage
Off-Switch Current vs. Temperature
1.000
2.2
2.0
1.8
1.6
VIH
1.4
IOFFSW (μA)
ON/OFF Threshold (V)
3
1.2
VIL
1.0
0.8
0.100
0.010
0.6
0.4
1.5
2.0
2.5
3.0
3.5
4.0
4.5
Input Voltage (V)
4280.2006.11.1.4
5.0
5.5
0.001
-40
-20
0
20
40
60
80
100
Temperature (°C)
5
AAT4280
Slew Rate Controlled Load Switch
Typical Characteristics — AAT4280-1
Unless otherwise noted, VIN = 5V, TA = 25°C.
AAT4280-1 Turn-On
AAT4280-1 Turn-On
(VIN = 3V; RL = 6Ω)
(VIN = 5V; RL = 10Ω)
ON/OFF (5V/div)
ON/OFF (5V/div)
VOUT (2V/div)
IIN (200mA/div)
IIN (200mA/div)
Time (500μs/div)
Time (500μs/div)
AAT4280-1 Turn-Off
AAT4280-1 Turn-Off
(VIN = 3V; RL = 6Ω)
(VIN = 5V; RL = 10Ω)
Time (10μs/div)
6
VOUT (2V/div)
ON/OFF (5V/div)
ON/OFF (5V/div)
VOUT (2V/div)
VOUT (2V/div)
IIN (200mA/div)
IIN (200mA/div)
Time (10μs/div)
4280.2006.11.1.4
AAT4280
Slew Rate Controlled Load Switch
Typical Characteristics — AAT4280-2
Unless otherwise noted, VIN = 5V, TA = 25°C.
AAT4280-2 Turn-On
AAT4280-2 Turn-On
(VIN = 3V; RL = 6Ω)
(VIN = 5V; RL = 10Ω)
ON/OFF (5V/div)
ON/OFF (5V/div)
VOUT (2V/div)
VOUT (2V/div)
IIN (200mA/div)
IIN (200mA/div)
Time (5μs/div)
AAT4280-2 Turn-Off
AAT4280-2 Turn-Off
(VIN = 3V; RL = 6Ω)
(VIN = 5V; RL = 10Ω)
Time (5μs/div)
4280.2006.11.1.4
Time (5μs/div)
ON/OFF (5V/div)
ON/OFF (5V/div)
VOUT (2V/div)
VOUT (2V/div)
IIN (200mA/div)
IIN (200mA/div)
Time (5μs/div)
7
AAT4280
Slew Rate Controlled Load Switch
Typical Characteristics — AAT4280-3
Unless otherwise noted, VIN = 5V, TA = 25°C.
AAT4280-3 Turn-On
AAT4280-3 Turn-On
(VIN = 3V; RL = 6Ω)
(VIN = 5V; RL = 10Ω)
ON/OFF (5V/div)
VOUT (2V/div)
IIN (200mA/div)
Time (50μs/div)
VOUT (2V/div)
IIN (200mA/div)
Time (50μs/div)
AAT4280-3 Turn-Off
AAT4280-3 Turn-Off
(VIN = 3V; RL = 6Ω)
(VIN = 5V; RL = 10Ω)
ON/OFF (5V/div)
ON/OFF (5V/div)
VOUT (2V/div)
VOUT (2V/div)
IIN (200mA/div)
IIN (200mA/div)
Time (5μs/div)
8
ON/OFF (5V/div)
Time (5μs/div)
4280.2006.11.1.4
AAT4280
Slew Rate Controlled Load Switch
Functional Block Diagram
IN
OUT
UnderVoltage
Lockout
Turn-On
Slew Rate
Control
Level
Shift
*
ON/OFF
GND
*AAT4280-3 only
Functional Description
The AAT4280 is a family of flexible P-channel MOSFET power switches designed for high-side load
switching applications. There are three versions of
the AAT4280 with different turn-on and turn-off characteristics to choose from, depending upon the specific requirements of an application. The first version, the AAT4280-1, has a moderate turn-on slew
rate feature, which reduces inrush current when the
MOSFET is turned on. This function allows the load
switch to be implemented with either a small input
capacitor or no input capacitor at all. During turn-on
slewing, the current ramps linearly until it reaches
the level required for the output load condition. The
proprietary turn-on current control method works by
careful control and monitoring of the MOSFET gate
voltage. When the device is switched ON, the gate
voltage is quickly increased to the threshold level of
the MOSFET. Once at this level, the current begins
to slew as the gate voltage is slowly increased until
the MOSFET becomes fully enhanced. Once it has
reached this point, the gate is quickly increased to
the full input voltage and RDS(ON) is minimized.
4280.2006.11.1.4
The second version, the AAT4280-2, is a very fast
switch intended for high-speed switching applications. This version has no turn-on slew rate control
and no special output discharge features.
The final version, the AAT4280-3, has the addition
of a minimized slew rate limited turn-on function
and a shutdown output discharge circuit to rapidly
turn off a load when the load switch is disabled
through the ON/OFF pin.
All versions of the AAT4280 operate with input voltages ranging from 1.8V to 5.5V. All versions of this
device have extremely low operating current, making them ideal for battery-powered applications. In
cases where the input voltage drops below 1.8V,
the AAT4280 MOSFET device is protected from
entering into the saturation region of operation by
automatically shutting down through an under-voltage lockout control circuit. The ON/OFF control pin
is TTL compatible and will also function with 2.5V
to 5V logic systems, making the AAT4280 an ideal
level-shifting load switch.
9
AAT4280
Slew Rate Controlled Load Switch
Applications Information
Input Capacitor
A 1µF or larger capacitor is typically recommended
for CIN in most applications. A CIN capacitor is not
required for basic operation. However, CIN is useful in preventing load transients from affecting
upstream circuits. CIN should be located as close
to the device VIN pin as practically possible.
Ceramic, tantalum, or aluminum electrolytic capacitors may be selected for CIN. There is no specific
capacitor ESR requirement for CIN. However, for
higher current operation, ceramic capacitors are
recommended for CIN due to their inherent capability over tantalum capacitors to withstand input current surges from low impedance sources, such as
batteries in portable devices.
Output Capacitor
For proper slew operation, a 0.1µF capacitor or
greater between VOUT and GND is recommended.
The output capacitor has no specific capacitor type
or ESR requirement. If desired, COUT may be
increased without limit to accommodate any load
transient condition without adversely affecting the
device turn-on slew rate time.
Enable Function
The AAT4280 features an enable / disable function.
This pin (ON/OFF) is compatible with both TTL or
CMOS logic.
Reverse Output-to-Input Voltage
Conditions and Protection
highly recommended. A larger value of CIN with
respect to COUT will effect a slower CIN decay rate
during shutdown, thus preventing VOUT from
exceeding VIN. In applications where there is a
greater danger of VOUT exceeding VIN for extended
periods of time, it is recommended to place a
Schottky diode from VIN to VOUT (connecting the
cathode to VIN and anode to VOUT). The Schottky
diode forward voltage should be less than 0.45V.
Thermal Considerations and
High Output Current Applications
The AAT4280 is designed to deliver a continuous
output load current. The limiting characteristic for
maximum safe operating output load current is
package power dissipation. In order to obtain high
operating currents, careful device layout and circuit
operating conditions need to be taken into account.
The following discussions will assume the load
switch is mounted on a printed circuit board utilizing the minimum recommended footprint, as stated
in the Layout Considerations section of this
datasheet.
At any given ambient temperature (TA), the maximum package power dissipation can be determined by the following equation:
PD(MAX) = [TJ(MAX) - TA] / ΘJA
Constants for the AAT4280 are maximum junction
temperature, TJ(MAX) = 125°C, and package thermal
resistance, ΘJA = 120°C/W. Worst case conditions
are calculated at the maximum operating temperature where TA = 85°C. Typical conditions are calculated under normal ambient conditions where TA
= 25°C. At TA = 85°C, PD(MAX) = 333mW. At TA =
25°C, PD(MAX) = 833mW.
Under normal operating conditions, a parasitic
diode exists between the output and input of the
load switch. The input voltage should always
remain greater than the output load voltage, maintaining a reverse bias on the internal parasitic
diode. Conditions where VOUT might exceed VIN
should be avoided since this would forward bias
the internal parasitic diode and allow excessive
current flow into the VOUT pin and possibly damage
the load switch.
The maximum continuous output current for the
AAT4280 is a function of the package power dissipation and the RDS of the MOSFET at TJ(MAX). The
maximum RDS of the MOSFET at TJ(MAX) is calculated by increasing the maximum room temperature
RDS by the RDS temperature coefficient. The temperature coefficient (TC) is 2800ppm/°C. Therefore,
In applications where there is a possibility of VOUT
exceeding VIN for brief periods of time during normal
operation, the use of a larger value CIN capacitor is
MAX RDS125°C = 120mΩ · (1 + 0.0028 ·
(125°C - 25°C)) = 154mΩ
10
MAX RDS125°C = RDS25°C · (1 + TC · ΔT)
4280.2006.11.1.4
AAT4280
Slew Rate Controlled Load Switch
For maximum current, refer to the following equation:
IOUT(MAX) < ( PD(MAX) / RDS)
1/2
For example, if VIN = 5V, RDS(MAX) = 154mΩ and TA
= 25°C, IOUT(MAX) = 2.3A. If the output load current
were to exceed 2.3A or if the ambient temperature
were to increase, the internal die temperature
would increase, and the device would be damaged.
Higher peak currents can be obtained with the
AAT4280. To accomplish this, the device thermal
resistance must be reduced by increasing the heat
sink area or by operating the load switch in a dutycycle manner.
High Peak Output Current Applications
Some applications require the load switch to operate at a continuous nominal current level with short
duration, high-current peaks. The duty cycle for
both output current levels must be taken into
account. To do so, first calculate the power dissipation at the nominal continuous current level, and
then add in the additional power dissipation due to
the short duration, high-current peak scaled by the
duty factor.
For example, a 4V system using an AAT4280 operates at a continuous 100mA load current level and
has short 2A current peaks, as in a GSM application. The current peak occurs for 576µs out of a
4.61ms period.
First, the current duty cycle is calculated:
% Peak Duty Cycle: X/100 = 576µs/4.61ms
% Peak Duty Cycle = 12.5%
The load current is 100mA for 87.5% of the 4.61ms
period and 2A for 12.5% of the period. Since the
Electrical Characteristics do not report RDS(MAX) for
4V operation, it must be calculated approximately
by consulting the chart of RDS(ON) vs. VIN. The RDS
4280.2006.11.1.4
reported for 5V can be scaled by the ratio seen in
the chart to derive the RDS for a 4V VIN: 120mΩ ·
87mΩ /80mΩ = 130mΩ. De-rated for temperature:
130mΩ x (1 + 0.0028 · (125°C -25°C)) = 166mΩ.
The power dissipation for a 100mA load is calculated as follows:
PD(MAX) = IOUT2 · RDS
PD(100mA) = (100mA)2 · 166mΩ
PD(100mA) = 1.66mW
PD(87.5%D/C) = %DC · PD(100mA)
PD(87.5%D/C) = 0.875 · 1.66mW
PD(87.5%D/C) = 1.45mW
The power dissipation for 100mA load at 87.5%
duty cycle is 1.45mW. Now the power dissipation
for the remaining 12.5% of the duty cycle at 2A is
calculated:
PD(MAX) = IOUT2 · RDS
PD(2A) = (2A)2 · 166mΩ
PD(2A) = 664mW
PD(12.5%D/C) = %DC · PD(2A)
PD(12.5%D/C) = 0.125 · 664mW
PD(12.5%D/C) = 83mW
The power dissipation for 2A load at 12.5% duty
cycle is 83mW. Finally, the two power figures are
summed to determine the total true power dissipation under the varied load.
PD(total) = PD(100mA) + PD(2A)
PD(total) = 1.45mW + 83mW
PD(total) = 84.5mW
The maximum power dissipation for the AAT4280
operating at an ambient temperature of 85°C is
333mW. The device in this example will have a
total power dissipation of 84.5mW. This is well
within the thermal limits for safe operation of the
device; in fact, at 85°C, the AAT4280 will handle a
2A pulse for up to 50% duty cycle. At lower ambient temperatures, the duty cycle can be further
increased.
11
AAT4280
Slew Rate Controlled Load Switch
Printed Circuit Board Layout
Recommendations
For proper thermal management and to take
advantage of the low RDS(ON) of the AAT4280, a few
circuit board layout rules should be followed: VIN
and VOUT should be routed using wider than normal
traces, and GND should be connected to a ground
plane. To maximize package thermal dispation and
power handling capacity of the AAT4280 SOT23-6/
SC70JW-8 package, the ground plane area connected to the ground pins should be made as large
as possible. For best performance, CIN and COUT
should be placed close to the package pins.
Figure 1: Evaluation Board
Top Side Silk Screen Layout /
Assembly Drawing.
12
Evaluation Board Layout
The AAT4280 evaluation layout follows the printed
circuit board layout recommendations, and can be
used for good applications layout. Refer to Figures 1
through 3.
Note: Board layout shown is not to scale.
Figure 2: Evaluation Board
Component Side Layout.
Figure 3: Evaluation Board
Solder Side Layout.
4280.2006.11.1.4
AAT4280
Slew Rate Controlled Load Switch
Ordering Information
Device Option
Package
Marking1
Part Number (Tape and Reel)2
AAT4280-1
AAT4280-2
AAT4280-3
AAT4280-1
AAT4280-2
AAT4280-3
SOT23-6
SOT23-6
SOT23-6
SC70JW-8
SC70JW-8
SC70JW-8
COXYY
BZXYY
CJXYY
COXYY
BZXYY
CJXYY
AAT4280IGU-1-T1
AAT4280IGU-2-T1
AAT4280IGU-3-T1
AAT4280IJS-1-T1
AAT4280IJS-2-T1
AAT4280IJS-3-T1
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semiconductor products that are in compliance with current RoHS standards, including
the requirement that lead not exceed 0.1% by weight in homogeneous materials. For more
information, please visit our website at http://www.analogictech.com/pbfree.
Package Information
SOT23-6
2.85 ± 0.15
1.90 BSC
2.80 ± 0.20
1.20 ± 0.25
0.15 ± 0.07
4° ± 4°
1.10 ± 0.20
0.075 ± 0.075
1.575 ± 0.125
0.95 BSC
10° ± 5°
0.40 ± 0.10 × 6
0.60 REF
0.45 ± 0.15
GAUGE PLANE
0.10 BSC
All dimensions in millimeters.
1. XYY = assembly and date code.
2. Sample stock is generally held on all part numbers listed in BOLD.
4280.2006.11.1.4
13
AAT4280
Slew Rate Controlled Load Switch
SC70JW-8
2.20 ± 0.20
1.75 ± 0.10
0.50 BSC 0.50 BSC 0.50 BSC
0.225 ± 0.075
2.00 ± 0.20
0.100
7° ± 3°
0.45 ± 0.10
4° ± 4°
0.05 ± 0.05
0.15 ± 0.05
1.10 MAX
0.85 ± 0.15
0.048REF
2.10 ± 0.30
All dimensions in millimeters.
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or other intellectual property rights are implied. AnalogicTech reserves the right to make changes to their products or specifications or to discontinue any product or service without notice.
Customers are advised to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgement, including those pertaining to warranty, patent infringement, and limitation of liability. AnalogicTech
warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with AnalogicTech’s standard warranty. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed.
AnalogicTech and the AnalogicTech logo are trademarks of Advanced Analogic Technologies Incorporated. All other brand and product names appearing in this document are registered trademarks or trademarks of their respective holders.
Advanced Analogic Technologies, Inc.
830 E. Arques Avenue, Sunnyvale, CA 94085
Phone (408) 737-4600
Fax (408) 737-4611
14
4280.2006.11.1.4
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