AAT4601A
DATA SHEET
1.8A Current Limited P-Channel Switch
1
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Typical Application
AAT4601A
ON
IN OUT
SET
GND
ON
1μF
100kΩ
R
SET
1μF
INPUT OUTPUT
IN OUT
FAULT
1
2
8
3
6
7
5
4
General Description
The AAT4601A 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 AAT4601A
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 AAT4601A is available in a Pb-free, 8-pin SOP or
MSOP package and is specified over the -40°C to +85°C
temperature 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 or MSOP Package
Applications
• Hot Swap Supplies
• Notebook Computers
• Peripheral Ports
• USB Ports
UL Recognized Component
AAT4601A
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 temperature
exceeds +135ºC, with a 2ms delay after the fault event occurs.
Pin Configuration
SOP-8 MSOP-8
(Top View) (Top View)
1 2
OUT
FAULT
OUT
SET
IN
IN
ON
GND
1
2
3
4
8
7
6
5
1 2
OUT
FAULT
OUT
SET
IN
IN
ON
GND
1
2
3
4
8
7
6
5
AAT4601A
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 V
VON, VFAULT ON, FAULT to GND -0.3 to VIN + 0.3 V
VSET, VOUT SET, OUT to GND -0.3 to VIN + 0.3 V
IMAX Maximum Continuous Switch Current 3 A
TJOperating Junction Temperature Range -40 to 150 °C
TLEAD Maximum Soldering Temperature (at Leads) 300 °C
VESD ESD Rating—HBM24000 V
Thermal Characteristics3
Symbol Description Value Units
JA Maximum Thermal Resistance SOP-8 100 °C/W
MSOP-8 150
PDMaximum Power Dissipation SOP-8 1.25 W
MSOP-8 833 mW
AAT4601A
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 μA
IQ(OFF) Off-Supply Current ON = IN, VIN = 5.5V 0.004 1 μA
ISD(OFF) Off-Switch Current ON = IN, VIN = 5.5V, VOUT = 0 0.07 15 μA
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 = 20.5k750 1000 1250 mA
ILIM(MIN) Minimum Current Limit 260 mA
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 V
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 Time1VIN = 5V 200 μs
AAT4601A
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
(R
SET
= 20.5kΩ
Ω
; V
IN
= 5.0V)
Output Voltage (V)
Output Current (A)
0.0
0.2
0.4
0.6
0.8
1.0
1.2
01 23 45
RSET ILIM Product vs. ILIM
500
1000
1500
2000
2500
0 0.5 1 1.5 2
Typical ILIM (A)
Product (V)
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)
AAT4601A
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)
AAT4601A
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
AAT4601A
DATA SHEET
1.8A Current Limited P-Channel Switch
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Functional Description
The AAT4601A 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 AAT4601A 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
AAT4601A 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
AAT4601A 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 AAT4601A 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 AAT4601A 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.
Functional Block Diagram
IN
ON
SET
FAULT
OUT
Under-
Voltage
Lockout
Over-Temperature
Protection
1.2V
Reference
Current
Limit
AAT4601A
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
AAT4601A’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 as listed in the column, “Device Will Not
Current Limit Below.” The resistor value needed is listed
in the corresponding row in the column, “RSET
.” For exam-
ple, a USB port requires 500mA. The lowest level where
the device will current limit above 500mA is 507mA. The
corresponding resistor value for RSET would be 33k.
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 reading the column, “Device Always Current
Limits Below.” If the power supply connected to the
AAT4601A’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 AAT4601A with a 33k resistor connected between
the SET pin and GND. If the power supply connected to
the AAT4601A's IN pin can provide more than 845mA,
this supply will remain in regulation even if a short circuit
is applied to the USB port.
RSET
(kΩ)
Current
Limit Typ
(mA)
Device Will
Not Current
Limit Below
(mA)
Device Always
Current Limits
Below (mA)
7.5 2476 1857 3095
8.2 2277 1708 2847
9.1 2065 1549 2581
10 1895 1421 2369
11 1748 1311 2185
12 1633 1224 2041
13 1528 1146 1910
15 1353 1015 1691
16 1280 960 1600
18 1158 869 1448
20 1055 791 1318
22 972 729 1215
24 897 673 1122
27 811 608 1014
30 736 552 919
33 676 507 845
36 625 469 781
39 582 436 727
43 533 400 666
47 491 368 613
51 455 341 568
56 418 314 523
62 380 285 476
68 350 262 437
75 320 240 400
82 295 221 369
91 267 200 334
100 245 183 306
110 223 167 279
120 206 155 258
130 192 144 239
150 167 125 209
160 157 118 197
Table 1: Current Limit RSET Values.
AAT4601A
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 33k
Figure 1: Overload Operation.
Operation in Current Limit
If an excessive load is applied to the output of an
AAT4601A, the load current will be limited by the device’s
current limit circuitry as shown in Figure 1, “Overload
Operation.” If a short circuit were to occur on the load,
it would demand more current than allowed by the inter-
nal current limiting circuit and the voltage at the
AAT4601A’s output would drop. This causes the AAT4601A
to dissipate more power than in normal operation, caus-
ing the die temperature to increase. When die tempera-
ture exceeds the internal over-temperature threshold,
the AAT4601A will shut down. After shutting down, the
AAT4601A cools to a level below the over-temperature
threshold, at which point it will start up again. The
AAT4601A will continue to cycle off and on until one of
the following events occurs: the load current is reduced
to a level below the AAT4601A’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 AAT4601A 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
AAT4601A at high temperature. RJA is the thermal resis-
tance between the AAT4601A’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 AAT4601A 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 AAT4601A’s over-temperature protection. With a
typical 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 print-
ed circuit 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.
AAT4601A
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
AAT4601A, 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 AAT4601A.
The second purpose of the input capacitor is to prevent
transient events generated by the load circuit from
affecting operation of the AAT4601A. For example, if an
AAT4601A 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 AAT4601A's under-
voltage lockout threshold. This drop in voltage would
cause the AAT4601A to turn off until the input power
supply's 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 AAT4601A 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
AAT4601A used to control the USB port.
ON Input
When the AAT4601A 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 AAT4601A 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 continuously active
for more than approximately 2ms, the FAULT pin is
pulled to ground internally through a 100 resistance.
The 2ms delay on the FAULT function is intended to pre-
vent capacitive loads connected to the load switch out-
put 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
present on the IN pin. This is done to allow the AAT4601A
to signal ancillary circuitry that is powered by a voltage
level less than the level on the IN pin.
Reverse Voltage
The AAT4601A is designed to control current flowing
from IN to OUT. If a voltage is applied to OUT that is
greater than that on IN, a large resulting reverse current
may flow, potentially damaging the AAT4601A.
Printed Circuit Board
Layout Recommendations
For proper thermal management, and to take advantage
of the low RDS(ON) of the AAT4601A, 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. For best performance,
CIN and COUT should be placed close to the package pins.
Evaluation Board Layout
The AAT4601A evaluation layout follows the printed cir-
cuit board layout recommendations and can be used for
good applications layout.
Note: Board layout shown is not to scale.
AAT4601A
DATA SHEET
1.8A Current Limited P-Channel Switch
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Figure 1: AAT4601A Evaluation Figure 2: AAT4601A Evaluation
Board Top Side Silk Screen Board Component Side Layout.
Assembly Drawing.
Figure 3: AAT4601A Evaluation
Board Solder Side Layout.
AAT4601A
DATA SHEET
1.8A Current Limited P-Channel Switch
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1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
Ordering Information
Package Marking1Part Number (Tape and Reel)2
SOP-8 4601A AAT4601AIAS-T1
MSOP-8 MQXYY AAT4601AIKS-T1
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.
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.
AAT4601A
DATA SHEET
1.8A Current Limited P-Channel Switch
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Copyright © 2012 Skyworks Solutions, Inc. All Rights Reserved.
Information in this document is provided in connection with Skyworks Solutions, Inc. (“Skyworks”) products or services. These materials, including the information contained herein, are provided by Skyworks as a
service to its customers and may be used for informational purposes only by the customer. Skyworks assumes no responsibility for errors or omissions in these materials or the information contained herein. Sky-
works may change its documentation, products, services, specifi cations or product descriptions at any time, without notice. Skyworks makes no commitment to update the materials or information and shall have no
responsibility whatsoever for confl icts, incompatibilities, or other diffi culties arising from any future changes.
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MSOP-8
PIN 1
1.95 BSC
0.254 BSC
0.155
±
0.075
0.60
±
0.20
3.00
±
0.10
0.95
±
0.15
0.95 REF
0.85
±
0.10
3.00
±
0.10
10
°
±
5
°
4
°
±
4
°
0.65 BSC 0.30
±
0.08
0.075
±
0.075
4.90
±
0.10
GAUGE PLANE
All dimensions in millimeters.
