AAT4601
DATA SHEET
1.8A Current Limited P-Channel Switch
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Typical Application
AAT4601
ON
IN OUT
SET
GND
1μF
100kΩ
R
SET
1μF
INPUT OUTPUT
IN OUT
FAULT
1
2
8
3
6
7
5
4
ON
General Description
The AAT4601 SmartSwitch is a member of Skyworks'
Application Specific Power MOSFET™ (ASPM™) product
family. It is a 1.8A current limited P-channel MOSFET
power switch designed for high-side load switching appli-
cations. This switch operates with inputs ranging from
2.7V to 5.5V, making it ideal for both 3V and 5V systems.
An integrated current-limiting circuit protects the input
supply against large changes in load current which could
cause the supply to fall out of regulation. The AAT4601
has protection from thermal overload which limits power
dissipation and junction temperatures. The maximum
current limit level will guarantee that 1.8A can be deliv-
ered to the load; the actual threshold is programmed
with a resistor from the SET pin to ground. The quiescent
supply current is typically 12μA. In shutdown mode, the
supply current decreases to less than 1μA.
The AAT4601 is available in a Pb-free, 8-pin SOP pack-
age and is specified over the -40°C to +85°C tempera-
ture range.
Features
• Input Voltage: 2.7V to 5.5V
• Programmable Over-Current Threshold
• Low Quiescent Current
▪ 12μA Typical
▪ Less Than 1μA with Switch Off
• Only 2.5V Needed for ON Control
• Thermal Shutdown
• Fault Flag
• 2ms Fault Blanking
• Under-Voltage Lockout
• Temperature Range: -40°C to +85°C
• 4kV ESD Rating
• UL Approved—File No. E217765
• 8-Pin SOP Package
Applications
• Hot Swap Supplies
• Notebook Computers
• Peripheral Ports
• USB Ports
UL Recognized Component
AAT4601
DATA SHEET
1.8A Current Limited P-Channel Switch
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Pin Descriptions
Pin # Symbol Function
1, 2 IN These pins are the input to the P-channel MOSFET source. Connect a 1μF capacitor from IN to GND.
3ON Active low enable input. A logic low turns the switch on.
4 GND Ground.
5 SET Current limit set input. A resistor from SET to ground sets the current limit for the switch.
6, 7 OUT These pins are the P-channel MOSFET drain connection. Connect a 1μF capacitor from OUT to GND.
8FAULT Fault indication output. This open-drain output goes low when in current limit or when the die tem-
perature exceeds +135ºC, with a 2ms delay after the fault event occurs.
Pin Configuration
SOP-8
(Top View)
1 2
OUT
FAULT
OUT
SET
IN
IN
ON
GND
1
2
3
4
8
7
6
5
AAT4601
DATA SHEET
1.8A Current Limited P-Channel Switch
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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.
2. Human body model is a 100pF capacitor discharged through a 1.5k resistor into each pin.
3. Mounted on an FR4 printed circuit board.
Absolute Maximum Ratings1
TA = 25°C, unless otherwise noted.
Symbol Description Value Units
VIN IN to GND -0.3 to 6
VVON, VFAULT ON,FAULT to GND -0.3 to VIN + 0.3
VSET, VOUT SET, OUT to GND -0.3 to VIN + 0.3
IMAX Maximum Continuous Switch Current 3 A
TJOperating Junction Temperature Range -40 to 150 °C
TLEAD Maximum Soldering Temperature (at Leads) 300
VESD ESD Rating—HBM24kV
Thermal Characteristics3
Symbol Description Value Units
JA Maximum Thermal Resistance 100 °C/W
PDMaximum Power Dissipation 1.25 W
AAT4601
DATA SHEET
1.8A Current Limited P-Channel Switch
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1. Guaranteed by design.
Electrical Characteristics
VIN = 5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C.
Symbol Description Conditions Min Typ Max Units
VIN Operation Voltage 2.7 5.5 V
IQQuiescent Current VIN = 5V, ON = GND, IOUT = 0 12 30
μAIQ(OFF) Off-Supply Current ON = IN, VIN = 5.5V 0.004 1
ISD(OFF) Off-Switch Current ON = IN, VIN = 5.5V, VOUT = 0 0.07 15
VUVLO Under-Voltage Lockout Rising Edge, 1% Hysteresis 2.0 2.3 2.7 V
RDS(ON) On Resistance
VIN = 5.0V 70 120
m
VIN = 4.5V 75 130
VIN = 3.0V 80 150
VIN = 3.0V, TA = 25°C 80 110
ILIM Current Limit RSET = 2k510 715 920 mA
ILIM(MIN) Minimum Current Limit 375
OTMP Shutdown Temperature VIN = 5V 125 ºC
VONL ON Input Low Voltage 0.8
V
VONH ON Input High Voltage VIN = 2.7V to 3.6V 2.0
VIN = 4.5V to 5.5V 2.4
IONSINK ON Input leakage VON = 5.5V 0.01 1 μA
VFAULTL FAULT Logic Output Low Voltage ISINK =1mA 0.08 0.4 V
IFSINK FAULT Logic Output High Leakage VFAULT = 5.5V 0.05 1 μA
TRESP Current Limit Response Time VIN = 5V 2 μs
TBLANK Fault Blanking Time After Turn-On 2 ms
TOFF Turn-Off Time1 V
IN = 5V 20 μs
TON Turn-On Time1 V
IN = 5V 200
AAT4601
DATA SHEET
1.8A Current Limited P-Channel Switch
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Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Quiescent Current vs. Temperature
0
5
10
15
20
25
-40 -20 0 20 40 60 80 100 120
Temperature (°C)
Quiescent Current (μA)
0
0123456
5
10
15
20
25
Quiescent Current
Input Voltage (V)
Input Current (μA)
Current Limit
(RSET = 2kΩ; VIN = 5V)
0
0.2
0.4
0.6
0.8
1.0
012345
Output Voltage (V)
Output Current (A)
R
SET
* I
LIM
Product vs. I
LIM
Typical I
LIM
(A)
Product (V)
18000
19000
20000
21000
22000
23000
24000
25000
0.0 0.5 1.0 1.5 2.0 2.5
Off-Supply Current vs. Temperature
0.0001
0.001
0.01
0.1
1
10
-40 -20 0 20 40 60 80 100 120 140
Temperature (°C)
Off-Supply Current (μA)
Off-Switch Current vs. Temperature
1
0.1
0.01
0.001
0.0001
10
-40 -20 0 20 40 60 80 100 120 140
Temperature (°C)
Off-Switch Current (μA)
AAT4601
DATA SHEET
1.8A Current Limited P-Channel Switch
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Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Turn-On Time vs. Temperature
0
10
20
30
40
50
60
70
80
-40 -20 0 20 40 60 80 100 120
Temperature (°C)
Turn-On Time (μs)
VIN = 3V
VIN = 5V
Turn-Off Time vs. Temperature
0
0.2
0.4
0.6
0.8
1.0
1.8
1.6
1.4
1.2
2.0
-40 -20 0 20 40 60 80 100 120
Temperature (°C)
Turn-Off Time (μs)
VIN = 5V
VIN = 3V
Switch Turn-On Time
-1
0
1
2
3
4
5
6
-20 -10 0 40 60 80
Time (μs)
Voltage (V)
Output
ON
IOUT = ILIMIT
Switch Turn-Off Time
-1
0
1
2
3
4
5
6
-4-20246
Time (μs)
Voltage (V)
Output
ON
IOUT = ILIMIT
Short-Circuit Through 0.3Ω
0
2
4
6
8
02468
Time (μs)
Input and Output Voltage (V)
Output Current (A)
-4
0
4
8
12
Output Current
Output Voltage
Input Voltage
Short-Circuit Through 0.6Ω
0
2
4
6
8
-20 0 20 40 60 80 100 120 140
-3
0
3
6
9
Output Current
Output Voltage
Input Voltage
Time (μs)
Input and Output Voltage (V)
Output Current (A)
AAT4601
DATA SHEET
1.8A Current Limited P-Channel Switch
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Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Fault Delay vs. Temperature
0
0.5
1.0
1.5
2.0
2.5
-40 -20 0 20 40 60 80 100
Temperature (°C)
Fault Delay (ms)
RDS(ON) vs. Temperature
40
50
60
70
80
90
100
-40 -20 0 20 40 60 80
Temperature (°C)
RDS(ON) (mΩ)
VIN = 4.5V
VIN = 3V
AAT4601
DATA SHEET
1.8A Current Limited P-Channel Switch
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Functional Block Diagram
IN
ON
SET
FAULT
OUT
Under-
Voltage
Lockout
Over-Temperature
Protection
1.2V
Reference
Current
Limit
Functional Description
The AAT4601 is an integrated MOSFET load switch with
an adjustable current limit, over-temperature protection,
level-shifted input, and a fault flag. The current limit
control is combined with an over-temperature thermal
limit circuit to provide a comprehensive system to pro-
tect the load switch under short-circuit or other adverse
operating conditions. The AAT4601 is ideally suited for
control and protection of peripheral ports such as USB,
RS232, and parallel ports.
The current limit and over-temperature circuits will act
independently. The device current limit is activated when
the output load current exceeds an internal threshold
level. The internal current limit threshold is determined
by an external resistor connected between the SET pin
and ground. The minimum current limit threshold is
specified by ILIM(MIN). If the load switch ambient tempera-
ture becomes excessive or if a short-circuit condition
persists, the die temperature will rise, causing the over-
temperature protection circuit to activate.
If a current limit level less than ILIM(MIN) is required, the
AAT4601 can be used to operate in foldback current limit
mode. To achieve this, an RSET value can be chosen to
program a current limit lower than ILIM(MIN); in this case,
when the load current reaches ILIM(MIN), the current will
immediately drop, limiting at the programmed value.
If the current limit or over-temperature protection cir-
cuits are active for more than 2ms, the system will be
informed via the FAULT flag. The 2ms delay allows the
AAT4601 to be turned on into capacitive loads without
activating the FAULT flag. The open drain FAULT output
can be connected directly to system controllers driven by
voltage levels less than the IN pin voltage without addi-
tional level shifting circuitry.
The load switch is turned off by applying a logic high level
to the ON pin. The AAT4601 typically consumes 12μA
when operating; when off, the device draws less than
1μA. In the off state, current is prevented from flowing
between the input and output. The ON function has logic
level thresholds that allow the AAT4601 to be TTL com-
patible and may also be controlled by 2.5V to 5.0V CMOS
circuits. The voltage level on either ON or FAULT should
not exceed the input supply level present on the IN pin.
AAT4601
DATA SHEET
1.8A Current Limited P-Channel Switch
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Applications Information
Setting Current Limit
A simple three-step procedure can be used to adjust the
AAT4601’s current limit. First, the maximum current
required by the load should be determined. Second,
select a resistor that guarantees adequate current is
available to the load under normal conditions. Finally,
the maximum current that can pass through the switch
can be calculated and compared to the maximum current
available.
Step 1: The maximum current required by a load is usu-
ally defined in port specifications design application ref-
erences. For example, USB ports may be specified to
support loads of up to 500mA.
Step 2: The most convenient method for determining a
current limit resistor value is to look it up in Table 1,
“Current Limit RSET Values.”. Find the lowest current value
that is greater than the maximum load current in the
given application; refer to the column, “Device Will Not
Current Limit Below.” The resistor value needed is in the
corresponding row named “RSET
.” For example, a USB
port requires 500mA. The lowest level where the device
will current limit above 500mA is 516mA. The corre-
sponding resistor value for RSET would be 2k.
Step 3: Now the required resistor value has been deter-
mined. The maximum current that can be drawn, even
with a short circuit applied to the output, can be deter-
mined by referring to the column labeled, “Device Always
Current Limits Below.” If the power supply connected to
the AAT4601’s input can provide this current level, the
power supply voltage will not collapse when a short cir-
cuit is applied to the load switch output. For example, a
notebook computer has a USB port which is powered by
an AAT4601 with a 2k resistor connected between the
SET pin and GND. If the power supply connected to the
AAT4601's IN pin can provide more than 917mA, this
supply will remain in regulation even if a short circuit is
applied to the USB port.
RSET
(Ω)
Current
Limit Typ
(mA)
Device Will
Not Current
Limit Below
(mA)
Device Always
Current Limits
Below (mA)
0 2510 1807 3213
10 2463 1773 3152
20 2423 1745 3102
30 2386 1718 3054
36 2361 1700 3022
47 2332 1679 2985
56 2297 1654 2940
68 2258 1626 2890
82 2214 1594 2834
100 2161 1556 2766
120 2107 1517 2697
150 2028 1460 2596
200 1918 1381 2455
240 1840 1325 2355
300 1737 1251 2223
360 1649 1187 2111
470 1585 1141 2029
510 1529 1101 1957
560 1466 1055 1876
620 1397 1006 1788
680 1334 960 1707
750 1266 911 1620
820 1206 869 1544
910 1144 823 1464
1000 1089 784 1394
1100 1034 745 1324
1200 986 710 1262
1300 941 677 1204
1500 865 623 1107
1600 829 597 1061
1800 769 554 985
2000 716 516 917
2200 673 485 861
2400 633 456 811
2700 582 419 745
3000 539 388 690
3300 502 362 643
3600 470 339 602
3900 442 318 565
4300 410 295 524
4700 382 275 489
5100 358 258 458
5600 332 239 424
6200 306 220 392
6800 283 204 362
7500 268 193 343
Table 1: Current Limit RSET Values.
AAT4601
DATA SHEET
1.8A Current Limited P-Channel Switch
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0
1
2
3
4
5
6
-0.5 0 0.5 1 1.5 2
Time (s)
Voltage (V)
Output Voltage
Input Voltage
1 is Applied to Output at t = 0
RSET is 2k
Figure 1: Overload Operation.
Operation in Current Limit
If an excessive load is applied to the output of an
AAT4601, the load current will be limited by the device’s
current limit circuitry. Refer to Figure 1, Overload
Operation. If a short circuit were to occur on the load, it
would demand more current than allowed by the internal
current limiting circuit and the voltage at the AAT4601’s
output would drop. This causes the AAT4601 to dissipate
more power than in normal operation, causing the die
temperature to increase. When die temperature exceeds
the internal over-temperature threshold, the AAT4601
will shut down. After shutting down, the AAT4601 cools
to a level below the over-temperature threshold, at
which point it will start up again. The AAT4601 will con-
tinue to cycle off and on until one of the following events
occurs: the load current is reduced to a level below the
AAT4601’s current limit setting; the input power is
removed; or the output is turned off by a logic high level
applied to the ON pin.
Thermal Considerations
Since the AAT4601 has internal current limit and over-
temperature protection, junction temperature is rarely a
concern. If an application requires a large load current in
a high-temperature operating environment, there is the
possibility that the over-temperature protection circuit,
rather than the current limit circuit, will regulate the cur-
rent available to the load. In these applications, the
maximum current available without risk of activation of
the over-temperature circuit can be calculated. The
maximum internal temperature while current limit is not
active can be calculated using Equation 1:
Eq. 1: TJ(MAX) = IMAX
2 ∙ RDS(ON)(MAX) ∙ RθJA + TA(MAX)
In Equation 1, IMAX is the maximum current required by
the load. RDS(ON)(MAX) is the maximum rated RDS(ON) of the
AAT4601 at high temperature. RJA is the thermal resis-
tance between the AAT4601’s die and the board onto
which it is mounted. TA(MAX) is the maximum ambient
temperature for the printed circuit board assembly under
the AAT4601 when the load switch is not dissipating
power. Equation 1 can be transformed to provide IMAX;
Refer to Equation 2:
Eq. 2:
=
IMAX
TSD(MIN) - TA(MAX)
RDS(ON)(MAX) ∙ RθJA
TSD(MIN) is the minimum temperature required to activate
the AAT4601’s over-temperature protection. With a typi-
cal specification of 125°C, 115°C is a safe minimum
value to use.
For example, a portable device is specified to operate in
a 50°C environment. The printed circuit board assembly
will operate at temperatures as high as 85°C. This por-
table device has a sealed case and the area of the
printed board assembly is relatively small, causing RJA to
be approximately 120°C/W. Using Equation 2:
Eq. 3:
=
IMAX = 1.4
A
115°C - 85°C
0.13Ω · 120°C/W
If this system requires less than 1.4A, the thermal limit
will not activate during normal operation.
AAT4601
DATA SHEET
1.8A Current Limited P-Channel Switch
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Input Capacitor
The input capacitor serves two purposes. First, it pro-
tects the source power supply from transient current
effects generated by the application load circuit. If a
short circuit is suddenly applied to the output of an
AAT4601, there is a microsecond-long period during
which a large current can flow before the current limit
circuitry activates; refer to the characteristic curve,
“Short-Circuit Through 0.3." A properly sized input
capacitor can dramatically reduce the load switch input
transient response effects seen by the power supply and
other circuitry upstream from the AAT4601.
The second purpose of the input capacitor is to prevent
transient events generated by the load circuit from affect-
ing operation of the AAT4601. For example, if an AAT4601
is used in a circuit that operates from a 3V power supply
with poor step load response, it is possible that turning on
the load switch could cause the input power supply to
droop below the AAT4601's under-voltage lockout thresh-
old. This drop in voltage would cause the AAT4601 to turn
off until the input power supply voltage recovers. Since
this cycle would be self-perpetuating, the entire circuit
could be seen to be unstable. In the very rare case where
capacitor cost is prohibitive, the output load circuit should
be slew rate limited when turned on.
Output Capacitor
In order to insure stability while the device current limit
is active, a small capacitance of approximately 1μF
should be used. When the AAT4601 is activated using
the ON function, there are no momentary current tran-
sients, as in the case when a short circuit is suddenly
applied to a device that is already on; refer to the char-
acteristic curve, “Switch Turn-On Time.” No matter how
big the output capacitor, output current is limited to the
value allowed by the threshold determined by RSET and
the internal current limiting circuitry. This permits very
large output capacitors to be used.
For example, USB ports are specified to have at least
120μF of downstream capacitance from their controlling
power switch. An output capacitance as large as 1000μF
would not disturb the input power supply to the AAT4601
used to control the USB port.
ON Input
When the AAT4601 is in the off state, the output is an
open circuit and the device quiecent current consump-
tion is reduced to less than 1μA. The ON threshold volt-
age is set to allow the AAT4601 to be controlled by 5V
TTL levels, as well as CMOS power from 2.5V to 5V. The
ON function control voltage level should not exceed the
input supply level applied to the IN pin.
FAULT Output
A FAULT flag is provided to alert a system if the load
switch is not receiving a sufficient voltage level to prop-
erly operate. If either the current limit or over-tempera-
ture circuits in any combination are active for more than
approximately 2ms continuously, the FAULT pin is pulled
to ground internally through a 100 resistance. The 2ms
delay on the FAULT function is intended to prevent
capacitive loads connected to the load switch output
from activating FAULT when the device is turned on. The
placement of a pull-up resistor between the FAULT pin
and the IN pin is recommended. Reasonable values for
the pull-up resistor should range from 10k to 100k.
Since FAULT is an open drain terminal, it may be pulled
up to any voltage that is not greater than the level pres-
ent on the IN pin. This is done to allow the AAT4601 to
signal ancillary circuitry that is powered by a voltage
level less than the level on the IN pin.
Reverse Voltage
The AAT4601 is designed to control current flowing from
IN to OUT. If a voltage is applied to OUT which is great-
er than that on IN, a large resulting reverse current may
flow, potentially damaging the AAT4601.
Printed Circuit Board
Layout Recommendations
For proper thermal management, and to take advantage
of the low RDS(ON) of the AAT4601, a few circuit board lay-
out rules should be followed: VIN and VOUT should be
routed using wider than normal traces, and GND should
be connected to a ground plane. For best performance,
CIN and COUT should be placed close to the package pins.
Evaluation Board Layout
The AAT4601 evaluation layout follows the printed circuit
board layout recommendations, and can be used for
good applications layout.
Note: Board layout shown is not to scale.
AAT4601
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Figure 1: AAT4601 Evaluation Figure 2: AAT4601 Evaluation
Board Top Side Silk Screen Board Component Side Layout.
Assembly Drawing.
Figure 3: AAT4601 Evaluation
Board Solder Side Layout.
AAT4601
DATA SHEET
1.8A Current Limited P-Channel Switch
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use or sale.
Customers are responsible for their products and applications using Skyworks products, which may deviate from published specifi cations as a result of design defects, errors, or operation of products outside of pub-
lished parameters or design specifi cations. Customers should include design and operating safeguards to minimize these and other risks. Skyworks assumes no liability for applications assistance, customer product
design, or damage to any equipment resulting from the use of Skyworks products outside of stated published specifi cations or parameters.
Skyworks, the Skyworks symbol, and “Breakthrough Simplicity” are trademarks or registered trademarks of Skyworks Solutions, Inc., in the United States and other countries. Third-party brands and names are for
identifi cation purposes only, and are the property of their respective owners. Additional information, including relevant terms and conditions, posted at www.skyworksinc.com, are incorporated by reference.
Ordering Information
Package Marking1Part Number (Tape and Reel)2
SOP-8 4601 AAT4601IAS-T1
Package Information
SOP-8
0.175 ±
±
0.075 6.00
±
0.20
3.90
±
0.10
1.55
±
0.20
1.27 BSC0.42
±
0.09
×
8
4.90
±
0.10
4
°
±
4
°
45
°
0.375
±
0.125
0.235
±
0.045
0.825
±
0.445
All dimensions in millimeters.
1. XYY = assembly and date code.
2. Sample stock is generally held on all part numbers listed in BOLD.
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.
