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DATA SHEET
AAT4616: Ultrahigh Precision Adjustable Current Limited
Load Switch with Fault Flag
Applications
USB ports
Portable products
Hot-swap supplies
Notebook computers
Proprietary peripheral ports
Features
Input voltage: 2.4 V to 5.5 V
Programmable over-current limit setting: 300 mA to 1.6 A
±10% current limit precision at 750 mA
Fast transient response: 2 s response to short circuit
Low quiescent current:
10 A typical while enabled
1 A maximum with switch off
130 m typical RDS(ON)
Under-voltage lockout (UVLO)
Reverse blocking during disable
4 ms fault masking at startup (capacitive load)
Fault flag open-drain output
Active High/Low enable options
Over-temperature protection
Temperature range: 40 °C to +85 °C
5-pin SOT23-5 and 8-pin TDFN package (MSL1, 260 °C per
JEDEC-J-STD-020)
Description
The AAT4616 SmartSwitch is a current-limit P-channel MOSFET
power switch designed for high-side load switching applications.
This switch operates with inputs ranging from 2.4 V to 5.5 V,
making it ideal for both 3 V and 5 V systems. An integrated, highly
accurate current-limit circuit protects the input supply against
large currents, which may cause the supply to fall out of
regulation. Reverse current blocking is provided to protect the
load switch from reverse current flows while the device is in
shutdown.
The AAT4616 is also protected from thermal overload, which
limits power dissipation and junction temperature. Current-limit
threshold is programmed with a resistor from SET to ground, and
is adjusted for load levels up to 1.6 A. The ultrafast current limit
response to a sudden short circuit is 2 s, which reduces the
requirements of local supply bypassing. An open-drain FAULT flag
signals an over-current or over-temperature condition. To prevent
false reporting, a 4 ms time interval is used at startup (charging a
capacitive load), where fault conditions are not monitored and
reported. Quiescent current is a low 10 A and the supply current
decreases to less than 1 A in shutdown mode.
The AAT4616 is offered in small Pb-free, 5-pin SOT23-5 and
TDFN22-8 packages, and is specified for operation over the
–40°C to +85°C ambient temperature range.
A typical application circuit is shown in Figure 1. The pin
configuration is shown in Figure 2. Signal pin assignments and
functional pin descriptions are provided in Table 1.
Skyworks Green™ products are compliant with
all applicable legislation and are halogen-free.
For additional information, refer to Skyworks
Definition of Green™, document number
SQ04-0074.
V
IN
2.4 V ~ 5.5 V
1 μF0.47 μF
R
SET
V
OUT
100 kΩ
OUT
SET FLT
ON/ON
GND
IN
Fault
Flag
EN/EN
AAT4616
tc79
Figure 1. AAT4616 Typical Application Circuit
DATA SHEET • AAT4616 ULTRAHIGH PRECISION ADJUSTABLE CURRENT LIMITED LOAD SWITCH WITH FAULT FLAG
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GND
IN
ON/ON
SET
OUT
1
2
34
5
tc80
ON/ON
FLT
IN
IN
SET
GND
OUT
OUT
3
4
1
2
6
5
8
7
SOT23-5 TDFN22-8
Figure 2. AAT4616 Pinout – 5-Pin SOT23 and 8-Pin TDFN
(Top View)
Table 1. AAT4616 Signal Descriptions
Pin #
Name Description
SOT23-5 TDFN22-8
1 7, 8 OUT
Current-limit load switch output (high-side P-channel MOSFET drain). Connect a 0.47 F capacitor from OUT to GND for
best load transient response.
2 5 GND IC ground connection.
3 6 SET Current-limit set pin. Connect a resistor between this pin and ground to program the desired current limit set point.
4 3 ON/ON Load switch enable input. Active high and active low options are available.
5 1, 2 IN Load switch power supply input pin (high-side P-channel MOSFET source). Bypass with a 1 F capacitor from IN to GND.
NA 4 FLT Current-limit fault flag pin, open-drain output, active low signal. Pull up with a 10 k to 100 k resistor.
Electrical and Mechanical Specifications
The absolute maximum ratings of the AAT4616 are provided in
Table 2. The recommended operating conditions are specified in
Table 3, and electrical specifications are provided in Table 4.
Typical performance characteristics of the AAT4616 are illustrated
in Figures 3 through 14.
Table 2. AAT4616 Absolute Maximum Ratings (Note 1)
Parameter Symbol Minimum Typical Maximum Units
IN to GND VIN 0.3 +6.0 V
ON/ON, FLT to GND VON, VFLT 0.3 VIN 0.3 V
SET, OUT to GND VSET, VOUT 0.3 VIN 0.3 V
Maximum DC output current (Note 2) IMAX 2 A
Operating junction temperature range TJ 40 +150 ºC
Storage temperature range TSTG 40 +150 ºC
Maximum soldering temperature (at leads) TLEAD 300 ºC
Thermal resistance θJA
TDFN22-8 74 ºC/W
SOT23-5 220 ºC/W
Power dissipation (Notes 3 and 4) PD TDFN22-8 1.35 W
SOT23-5 0.45 W
Note 1: Exposure to maximum rating conditions for extended periods may reduce device reliability. There is no damage to device with only one parameter set at the limit and all other
parameters set at or below their nominal value. Exceeding any of the limits listed may result in permanent damage to the device.
Note 2: The current rating is based on long-term current density limitations.
Note 3: Mounted on an FR4 board.
Note 4: Derated 13.5 mW/ºC for TDFN22-8 package and 4.5 mW/ºC for SOT23-5 package above 25 ºC.
CAUTION: Although this device is designed to be as robust as possible, Electrostatic Discharge (ESD) can damage this device. This device
must be protected at all times from ESD. Static charges may easily produce potentials of several kilovolts on the human body
or equipment, which can discharge without detection. Industry-standard ESD precautions should be used at all times.
DATA SHEET • AAT4616 ULTRAHIGH PRECISION ADJUSTABLE CURRENT LIMITED LOAD SWITCH WITH FAULT FLAG
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Table 3. Recommended Operating Conditions
Parameter Symbol Minimum Typical Maximum Units
Input voltage VIN 2.4 5.5 V
High-level input voltage VON(H) 1.4 V
Low-level input voltage VON(L) 0.5 V
Operating temperature TA 40 +85 ºC
Table 4. AAT4616 Electrical Specifications (Note 1)
(VIN = 5 V, TA = 40 °C to 85 °C, [Typical Values are at TA = 25 °C], Unless Otherwise Noted)
Parameter Symbol Test Condition Min Typical Max Units
Input voltage VIN 2.4 5.5 V
Operation quiescent current IQ VIN = 5 V, ON/ON = Active, IOUT = 0 A 10 25 A
Off supply current IQ(OFF) ON/ON = Inactive, VIN = 5.5 V 0.01 1 A
Off switch current ISD(OFF) ON/ON = Inactive, VIN = 5.5 V, VOUT = 0 V 0.01 1 A
Under-voltage lockout VUVLO Rising edge, 1% Hysteresis 1.8 2.4 V
Under-voltage lockout hysteresis VUVLO_HYS 10 mV
On resistance RDS(ON) VIN = 5.0 V, TA = 25 °C 130 180 m
VIN = 3.0 V, TA = 25 °C 150 230 m
On-resistance temperature coefficient TCRDS 2800 ppm/°C
Current limit ILIM RSET = 6.04 k, VOUT = VIN – 0.5 V 0.67 0.75 0.79 A
Minimum current limit ILIM(MIN) 300 mA
ON/ON input low voltage VON(L) VIN = 2.4 V to 5.5 V 0.5 V
ON/ON input high voltage VON(H) VIN = 2.4 V to 5.5 V 1.4 V
ON/ON input leakage ION(SINK) VON = 5.5 V 0.01 1 A
Current limit response time TRESP VIN = 5 V 2 s
Turn-on time tON VIN = 5 V, RLOAD = 10 5 7 s
Turn-off time tOFF VIN = 5 V, RLOAD = 10 8 10 s
Fault flag blanking time tBLANK 4 ms
Fault flag logic low output VFLT(L) IFLT(SINK) = 1 mA 0.4 V
Fault flag logic high leakage current IFLT(SINK) 0.03 1 A
Over-temperature shutdown threshold TSD VIN = 5 V 140 °C
Over-temperature shutdown hysteresis TSD_HYS 15 °C
Note 1: Performance is guaranteed only under the conditions listed in this Table.
DATA SHEET • AAT4616 ULTRAHIGH PRECISION ADJUSTABLE CURRENT LIMITED LOAD SWITCH WITH FAULT FLAG
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Typical Performance Characteristics
0
5
10
15
20
-40 -15 10 35 6085
Temperature (°C)
IQ (μA)
Figure 3. Quiescent Current vs Temperature
(VIN = 5.0 V)
0
5
10
15
20
2.4 2.8 3.2 3.64 4.4 4.8 5.2 5.6
Input Voltage (V)
Quiescent Current (μA)
Figure 5. Quiescent Current vs Input Voltage
(TA = 25 C)
80
100
120
140
160
180
200
220
-40 -15 10 35 6085
V
IN
= 5 V
V
IN
= 3 V
Temperature (°C)
RDS
(
ON
)
(mΩ)
Figure 7. RDS(ON) vs Temperature
0
0.2
0.4
0.6
0.8
1
1 2 3 4 5
Output Voltage (V)
Current Limit (A)
Figure 4. Current Limit vs Output Voltage
(VIN = 5.0 V, TA = 25 C, RSET = 6.04 k)
0
0.02
0.04
0.06
0.08
0.1
-40 -15 10 35 6085
Temperature (°C)
Off-Switch Current (μA)
Figure 6. Off-Switch Current vs Temperature
(VIN = 5.5 V)
0
2
4
6
8
10
12
14
16
300 800 1300 1800
Output Current (mA)
R
SET
(kΩ)
Figure 8. RSET vs ILIM (TA = 25 C)
DATA SHEET • AAT4616 ULTRAHIGH PRECISION ADJUSTABLE CURRENT LIMITED LOAD SWITCH WITH FAULT FLAG
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Typical Performance Characteristics
1.6
0.2
0.4
0.6
0.8
1
1.2
1.4
2.4 3 3.64.2 4.8 5.4 6
V
ON
(
H
)
V
ON
(
L
)
Input Voltage (V)
ON(ON) Threshold (V)
Figure 9. ON(ON) Threshold vs Input Voltage
0
0
2 V/div
V
OUT
2 V/div
ON
Time 5.0 μs/div
Figure 11. AAT4616IPS-1 and AAT4616IGV-1 Turn-Off
(RL = 10 , CL = 0.47 F)
0
0
1 A/div
V
OUT
2 V/div
I
OUT
Time 20.0 ms/div
Figure 13. Output Short Response
(VIN = 5.0 V)
ON
2 V/div
V
OUT
2 V/div
0
0
Time 2.0 μs/div
Figure 10. AAT4616IPS-1 and AAT4616IGV-1 Turn-On
(RL = 10 , CL = 0.47 F)
0
0
1 A/div
V
OUT
2 V/div
I
OUT
Time 2.0 μs/div
Figure 12. Short Circuit Through 0.3
(VIN = 5.0 V)
FLT
5 V/div
0
0
0
1 A/div
V
OUT
5 V/div
I
OUT
Time 1.0 ms/div
Figure 14. Fault Blanking Time
(VIN = 5.0 V)
DATA SHEET • AAT4616 ULTRAHIGH PRECISION ADJUSTABLE CURRENT LIMITED LOAD SWITCH WITH FAULT FLAG
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Over-Temperature
Protection
1.2
V
Reference
Current Limit
Control
Under-Voltage
Lockout
OUT
SET
GND
ON/ON
IN
4 ms
Delay
FLT
Reverse
Blocking
tc41
Figure 15. AAT4616 Functional Block Diagram
Functional Description
The AAT4616 is a single-channel current-limit load switch that
is intended to protect against short-circuit and over-current
events by current limiting to a preset level. This device also
provides a reverse current blocking feature, on/off enable
control, and a fault flag to notify a system controller of an
over-current, short-circuit, or over-temperature events.
In the event of a load current exceeding a programmed current
limit level (ILIM), a high-speed current limit loop limits the
current in a microsecond and resets to low impedance once the
short circuit condition is removed.
The AAT4616 is internally protected from thermal damage by an
over-temperature detection circuit. If the die temperature
reaches the internal thermal limit, the power device is switched
off until the die temperature cools to a level below the thermal
limit threshold. This device may operate in a thermal cycling
state indefinitely or until the over-current condition is removed.
The AAT4616 operates with input voltages ranging from 2.4 V to
5.5 V which, along with its extremely low operating current,
makes it ideal for battery-powered applications. In cases where
the input voltage drops below 2.4 V, the AAT4616 MOSFET is
protected from entering the saturated region of operation by
being automatically shut down by the under-voltage lockout
circuit.
Current limit or over-temperature conditions are reported by the
open drain FAULT output. A 4 ms masking interval prevents
false reporting during the charging of a capacitive load, which
typically occurs during device turn-on, but may also occur
during a port hot plug-in event. The AAT4616 is ideally suited
for protection of peripheral ports such as USB, RS232, and
parallel ports.
Figure 15 shows the functional block diagram.
Reverse Current Blocking
The reverse current blocking feature prevents current flowing
from OUT to IN when the device is disabled. When the device is
enabled, the electrical characteristics between IN and OUT is
still similar to an ideal switch, and current can flow in either
direction.
Application Information
Setting Current Limit
The AAT4616 current limit can be set by an external resistor
(RSET) connected from the SET pin to GND. RSET can be
calculated by the following equation:
k6
ImA750
R
LIM
SET
where ILIM is in mA and RSET in k.
Table 5 summarizes resistor values for current limit settings.
Use 1% tolerance metal film resistors for programming the
desired current limit setting. Figure 16 shows the output current
vs. output voltage with RSET equal to 6.04 k.
DATA SHEET • AAT4616 ULTRAHIGH PRECISION ADJUSTABLE CURRENT LIMITED LOAD SWITCH WITH FAULT FLAG
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Table 5. Recommended 1% Tolerance Metal Film Resistors RSET
for Current Limit
RSET (k) Current Limit (mA)
15 300
8.87 500
6.04 750
4.53 1000
3.74 1200
3.09 1400
2.8 1600
0
0.2
0.4
0.6
0.8
1
12345
Output Voltage (V)
Current Limit (A)
Figure 16. Current Limit vs Output Voltage
(VIN = 5.0 V, TA = 25 C, RSET = 6.04 k)
Input Capacitor
The input capacitor CIN protects the power supply from current
transients generated by the load attached to the AAT4616.
When a short circuit is suddenly applied to the output of the
AAT4616, a large current, limited only by the RDS(ON) of the
MOSFET, flows for less than 1 s before the current limit
circuitry activates. In this event, a moderately sized CIN
dramatically reduces the voltage transient seen by the power
supply and by other circuitry upstream from the AAT4616.
The extremely fast short-circuit response time of the AAT4616
reduces the size requirement for CIN. CIN should be located as
close to the device VIN pin as practically possible. Ceramic,
tantalum, or aluminum electrolytic capacitors are appropriate
for CIN. There is no specific capacitor Equivalent Series
Resistance (ESR) requirement for CIN. 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
In order to ensure stability while current limit is active, a low
capacitance (approximately 0.47 F) is required. No matter how
large the output capacitor, the output current is limited to the
value set by the AAT4616 current-limit circuitry, so very large
output capacitors can be used.
For example, USB ports are specified to have at least 120 F of
capacitance downstream from their controlling power switch.
The current limiting circuit allows an output capacitance of
1000 F or more without disturbing the upstream power supply.
ON/ON (Enable Input)
In many systems, power planes are controlled by integrated
circuits that run at lower voltages than the power planes
themselves. The enable input (ON/ON) of the AAT4616 has low-
and high-threshold voltages that accommodate this condition.
The threshold voltages are compatible with 5 V TTL and
2.5 V 5 V CMOS systems.
Both active-high and active-low options are available for all
packages.
Connecting to Capacitive Load
When switching the AAT4616 onto a capacitive load, the
AAT4616 charges the output capacitive load at a rate no greater
than the current limit setting.
FAULT Output
The FAULT Flag (FLT) is provided to alert the system if an
AAT4616 load is not receiving sufficient voltage to operate
properly. If current limit or over-temperature circuits in any
combination are active for more than approximately 4 ms, the
FAULT Flag is pulled to ground through an approximately 100
resistor.
The filtering of voltage or current transients of less than 4 ms
prevents capacitive loads connected to the AAT4616 output
from activating the FAULT Flag when they are initially attached.
Pull-up resistances of 10 k to 100 k are recommended.
Since FLT is an open-drain terminal; it may be pulled up to any
unrelated voltage less than the maximum operating voltage of
5.5 V, allowing for level shifting between circuits.
Thermal Considerations
Since the AAT4616 has internal current limit and over-
temperature protection, junction temperature is rarely a concern.
However, if the application requires large currents in a hot
environment, it is possible that temperature, rather than current
limit, is the dominant regulating condition. In these applications,
the maximum current available without risk of an over-
temperature condition must be calculated. The maximum
internal temperature while current limit is not active can be
calculated using the following equation:
)MAX(AJA)MAX)(ON(DS
2)MAX(SW_)OUT(MAX)MAX(J TRRIT
(1)
where:
DATA SHEET • AAT4616 ULTRAHIGH PRECISION ADJUSTABLE CURRENT LIMITED LOAD SWITCH WITH FAULT FLAG
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IMAX is the maximum current required by the load.
RDS(ON)(MAX) is the maximum rated RDS(ON) of the AAT4616 at
high temperature.
RJA is the thermal resistance between the AAT4616 die and
the board onto which it is mounted.
TA(MAX) is the maximum temperature that the PCB under the
AAT4616 would be if the AAT4616 were not dissipating power.
Rearranging the equation to solve for IMAX:
JAMAXONDS
MAXAMINSD
MAX RR
TT
))((
)()(
I (2)
Note that TJ(MAX) has been replaced by TSD(MIN), the minimum
temperature required to activate the AAT4616's over-
temperature protection. With the typical specification of 140 °C,
125 °C is a safe minimum value to use.
For example, if an application is specified to operate in 50 °C
environments, the PCB operates at temperatures as high as
85 °C. The application is sealed and its PCB is small, causing
RJA to be approximately 74 °C/W (TDFN22-8 package) and
220 °C/W (SOT23-5 package). Using equation (2):
7423.0 85125
IMAX
for TDFN22-8
or
22023.0 85125
IMAX
for SOT23-5
Evaluation Board Information
The AAT4616IPS evaluation board schematic diagram is
provided in Figure 17, and the PCB layer details are shown in
Figure 18.
The AAT4616IGV evaluation board schematic diagram is
provided in Figure 19, and the PCB layer details are shown in
Figure 20. Table 6 lists the AAT4616 evaluation board bill of
materials.
C1
1 μF
C2
0.47 μF
1
2
3
J1
6.04 kΩ
R2
100 kΩ
OUT
1
SET
2
FLT
4
ON/ON
3GND 5
IN
6
U1
AAT4616IPS
IN 7
8
OUT
V
IN
R
SET
V
OUT
tc81
Figure 17. AAT4616IPS Evaluation Board Schematic
(a) Top layer (b) Bottom layer
tc82
Figure 18. AAT4616IPS Evaluation Board Layer Details
DATA SHEET • AAT4616 ULTRAHIGH PRECISION ADJUSTABLE CURRENT LIMITED LOAD SWITCH WITH FAULT FLAG
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C1C2
1
2
3
J1
OUT
5
SET
ON/ON
4GND 2
IN
3
U1
AAT4616IGV
1
1 μF0.47 μF
6.04 kΩ
VIN
RSET
VOUT
tc83
Figure 19. AAT4616IGV Evaluation Board Schematic
(a) Top layer (b) Bottom layer
tc84
Figure 20. AAT4616IGV Evaluation Board Layer Details
Table 6. AAT4616 Evaluation Board Bill of Materials
Component Part Number Description Manufacturer
U1 AAT4616 Current limited load switch Skyworks
C1 GRM188R71C105K Capacitor ceramic, 1 F, 0603 X7R, 16 V, 10% Murata
C2 GRM188R71C474K Capacitor ceramic, 0.47 F, 0603 X7R, 16 V, 10% Murata
Rset Chip Resistor Resistor, 6.04 k, 1/16 W, 1%, 0603 SMD Vishay
R2 Chip Resistor Resistor, 100 k, 1/16 W, 1%, 0603 SMD Vishay
DATA SHEET • AAT4616 ULTRAHIGH PRECISION ADJUSTABLE CURRENT LIMITED LOAD SWITCH WITH FAULT FLAG
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Package Information
Package dimensions for the SOT23-5 are shown in Figure 19,
and tape and reel dimensions are provided in Figure 20.
Package dimensions for the TDFN22-8 are shown in Figure 21,
and tape and reel dimensions are provided in Figure 22.
4°
°
±
±
4°
°
0.15 ±
±
0.07
0.45 ±
±
0.15 0.10 BSC
1.20
±
0.25
1.575 ±
±
0.125
2.80 ±
±
0.20
0.40
±
0.10
0.60 REF
2.85
±
0.15
1.90 BSC
0.95
BSC
1.10
±
0.20
10°
°
±
5°
°
GAUGE PLANE
0.075
±
0.075
0.60 REF
tc12
Top View
Side View Front View
All dimensions are in millimeters.
Figure 19. AAT4616 SOT23-5 Package Dimensions
1.40 ± 0.10
1.75 ± 0.05
2.00 ± 0.05
8.00 ± 0.30
4.00 ± 0.10
4.00 ± 0.10
tc85
All dimensions are in millimeters.
0.20 ± 0.03
3.50 ± 0.05
3.05 ± 0.05
3.15 ± 0.05
1.50 ± 0.10
Pin 1 Location
Figure 20. AAT4616 Tape and Reel Dimensions (SOT23-5)
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2.000 ±
±
0.050
Detail "A"
Index Area
4x
0.050 ±
±
0.050
0.600 ±
±
0.050
2.000 ±
±
0.050
1.270 ±
±
0.050
0.450 ±
±
0.050
0.350 ±
±
0.100
Pin 1 Indicator
(optional)
C0.3
0.230 ±
±
0.050
Top View
Side View
Detail "A"
Bottom View
0.229 ±
±
0.051
0.1 REF
(optional)
0.850 MAX
tc86
All dimensions are in millimeters.
Figure 21. AAT4616 TDFN22-8 Package Dimensions
1.50 ± 0.10 1.00 ± 0.05
0.30 ± 0.05
1.75 ± 0.10 3.50 ± 0.05
2.00 ± 0.05
8.10 ± 0.20
2.30 ± 0.05
4.00 ± 0.10
4.00 ± 0.10
2.30 ± 0.05
Pin 1 Location
tc45
All dimensions are in millimeters.
Figure 22. AAT4616 Tape and Reel Dimensions (TDFN22-8)
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Ordering Information
Model Name Enable Input Package Marking
(Note 1)
Manufacturing Part Number
(Note 2) Evaluation Board Part Number
AAT4616 ultra high precision adjustable
current limited load switch with fault flag
Active High TDFN22-8 R8XYY AAT4616IPS-1-T1 AAT4616IPS-1-EVB
Active Low TDFN22-8 U6VBF AAT4616IPS-T1 AAT4616IPS-EVB
Active High SOT23-5 R7XYY AAT4616IGV-1-T1 AAT4616IGV-1-EVB
Active Low SOT23-5 U5IBF AAT4616IGV-T1 AAT4616IGV-EVB
Note 1: XYY = assembly and date code.
Note 2: Sample stock is generally held on part numbers listed in BOLD.
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