AAT AAT4608IGV-T1

AAT4608
Current Limited Load Switch in SOT23 Package
General Description
Features
The AAT4608 SmartSwitch is a member of
AnalogicTech's Application Specific Power
MOSFET™ (ASPM™) product family. It is a current limited P-channel MOSFET power switch
designed for high-side load switching applications. 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 currents
which may cause the supply to fall out of regulation. The AAT4608 is also protected from thermal
overload which limits power dissipation and junction temperatures. It can be used to control loads
that require up to 1A. Current limit threshold is
programmed with a resistor from SET to ground.
The quiescent supply current is typically a low
15µA max.
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•
•
•
•
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SmartSwitch™
2.7V to 5.5V Input Voltage Range
Programmable Over-Current Threshold
Fast Transient Response:
— <1µs Response to Short Circuit
Low Quiescent Current
— 15µA Typical
— 1µA Max With Switch Off
160mΩ Typical RDS(ON)
Under-Voltage Lockout
Thermal Shutdown
Temperature Range: -40°C to +85°C
4kV ESD Rating
5-Pin SOT23 Package
Applications
The AAT4608 is available in a Pb-free, 5-pin
SOT23 package, and is specified over the -40°C to
+85°C temperature range.
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Hot Swap Supplies
Notebook Computers
Peripheral Ports
Personal Communication Devices
Typical Application
INPUT
5
IN
AAT4608
OUTPUT
1
OUT
SOT23
3
SET
GND
1µF
GND
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2
RSET
0.47µF
GND
1
AAT4608
Current Limited Load Switch in SOT23 Package
Pin Descriptions
Pin #
Symbol
Function
1
OUT
P-channel MOSFET drain. Connect 0.47µF capacitor from OUT to GND.
2
GND
Ground connection.
3
SET
Current limit set input. A resistor from SET to ground sets the current limit for
the switch.
4
N/C
No internal connection.
5
IN
P-channel MOSFET source. Connect 1µF capacitor from IN to GND.
Pin Configuration
SOT23-5
(Top View)
2
OUT
1
GND
2
SET
3
5
IN
4
N/C
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AAT4608
Current Limited Load Switch in SOT23 Package
Absolute Maximum Ratings1
TA = 25°C unless otherwise noted.
Symbol
Description
VIN
VSET, VOUT
IMAX
TJ
TLEAD
VESD
IN to GND
SET, OUT to GND
Maximum Continuous Switch Current
Operating Junction Temperature Range
Maximum Soldering Temperature (at Leads)
ESD Rating2 - HBM
Value
Units
-0.3 to 6
-0.3 to VIN + 0.3
2
-40 to 150
300
4000
V
V
A
°C
°C
V
Value
Units
150
667
°C/W
mW
Thermal Characteristics3
Symbol
ΘJA
PD
Description
Thermal Resistance
Power Dissipation
Electrical Characteristics
VIN = 5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = 25°C.
Symbol
VIN
IQ
VUVLO
RDS(ON)
ILIM
ILIM(MIN)
TRESP
Description
Operation Voltage
Quiescent Current
Under-Voltage Lockout
On Resistance
Current Limit
Minimum Current Limit
Current Limit Response Time
Conditions
Min
Typ
2.7
VIN = 5V, IOUT = 0
Rising Edge, 1% Hysteresis
VIN = 5.0V
VIN = 4.5V
VIN = 3.0V
RSET = 6.8kΩ
VIN = 5V
2.0
0.5
15
2.3
160
165
195
1
150
0.8
Max
Units
5.5
30
2.7
180
V
µA
V
mΩ
230
2.0
A
mA
µs
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 a demo board.
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AAT4608
Current Limited Load Switch in SOT23 Package
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Quiescent Current
40
25
Input Current (µA)
Quiescent Current (µA)
Quiescent Current vs. Temperature
20
15
10
5
30
20
10
0
-40
-20
0
20
40
60
80
100
0
120
2.5
Temperature (C)
3
3.5
4
4.5
5
5.5
Input Voltage (V)
RDS(ON) vs. Temperature
Output Current vs. Output Voltage
(RSET = 16kΩ)
250
200
RDS(ON) (mΩ)
Output Current (A)
0.6
0.4
0.2
Input = 3V
150
Input = 5V
100
50
0
0
-40
0
1
2
3
4
-20
0
20
40
60
80
100
5
Temperature (°C)
Output Voltage (V)
12
8
Input Voltage
4
4
Output Current
2
0
Output Voltage
0
-4
0
1
2
3
8
9
6
6
Input Voltage
4
3
Output Current
2
0
Output Voltage
0
Output Current (A)
6
Input and Output Voltage (V)
8
Time (µs)
4
Short Circuit Through 0.6Ω
Output Current (A)
Input and Output Voltage (V)
Short Circuit Through 0.3Ω
-3
0
1
2
3
Time (µs)
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AAT4608
Current Limited Load Switch in SOT23 Package
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
RSET vs. ILIM
RSET Coefficient vs. ILIM
10
RSET ILIM Product (kV)
RSET (kΩ)
100
10
1
0.1
9
8
7
6
5
1
10
ILIM (A)
0
0.5
1
1.5
2
ILIM (A)
Current Limit vs. Temperature
Current Limit (%)
6
RSET = 22.1k
VIN - VOUT = 0.5V
4
2
0
-2
-4
-6
-50
- 25
0
25
50
75
100
Temperature (°C)
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AAT4608
Current Limited Load Switch in SOT23 Package
Functional Block Diagram
IN
OUT
Over-Temp
Protection
Undervoltage
Lockout
1.2V
Reference
SET
Current
Limit
RSET
GND
Applications Information
Current Limit Using 10.5kΩ
1.2
Setting Current Limit
6
Device with high current limit at -40°C
0.88 A
1
0.8
ILIM (A)
In most applications, the variation in ILIM must be
taken into account when determining RSET. The ILIM
variation is due to processing variations from part
to part, as well as variations in the voltages at IN
(Pin 5) and OUT (Pin 1), plus the operating temperature. See charts "Current Limit vs.
Temperature," and "Output Current vs. VOUT."
Together these three factors add up to a ±25% tolerance (see ILIM specification in Electrical
Characteristics section). In the figure below, a cold
device with a statistically higher current limit, and a
hot device with a statistically lower current limit,
both with RSET equal to 10.5kΩ, are shown. While
the chart, "RSET vs. ILIM" indicates an ILIM of 0.7A
with an RSET of 10.5kΩ, this figure shows that the
actual current limit will be at least 0.525A, and no
greater than 0.880A.
0.6
0.525 A
0.4
Device with low current limit at 85°C
0.2
0
0
1
2
3
4
5
VOUT (V)
To determine RSET, start with the maximum current
drawn by the load and multiply it by 1.33.
(Typical_ILIM = minimum_ILIM / 0.75.) This is the
typical current limit value. Next, refer to "RSET vs.
ILIM" and find the RSET that corresponds to the typ-
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AAT4608
Current Limited Load Switch in SOT23 Package
ical current limit value. Choose the largest resistor
available that is less than or equal to it. For greater
precision, the value of RSET may also be calculated
using the ILIM RSET product found in the chart "RSET
coefficient vs. ILIM." The maximum current is
derived by multiplying the typical current for the
chosen RSET in the chart by 1.25. A few standard
resistor values are listed in Table 1.
RSET
Ω)
(kΩ
Current
Limit
(Typ)
(mA)
Device Will
Not Current
Limit
Below (mA)
Device
Always
Current
Limits
Below (mA)
40.2
30.9
24.9
22.1
19.6
17.8
16.2
14.7
13.0
10.5
8.87
7.50
6.81
6.04
5.49
4.99
4.64
200
250
300
350
400
450
500
550
600
700
800
900
1000
1100
1200
1300
1400
150
188
225
263
300
338
375
413
450
525
600
675
750
825
900
975
1050
250
313
375
438
500
563
625
688
750
875
1000
1125
1250
1375
1500
1625
1750
Example: A USB port requires 0.5A. 0.5A multiplied
by 1.33 is 0.665A. From the chart named "RSET vs.
ILIM," RSET should be less than 11kΩ. 10.5kΩ is a
standard value that is a little less than 11kΩ but
very close. The chart reads approximately 0.700A
as a typical ILIM value for 10.5kΩ. Multiplying
0.700A by 0.75 and 1.25 shows that the AAT4608
will limit the load current to greater than 0.525A,
but less than 0.875A.
Operation in Current Limit
When a heavy load is applied to the output of the
AAT4608, the load current is limited to the value of
ILIM determined by RSET (see Figure 1). Since the
load is demanding more current than ILIM, the voltage at the output drops. This causes the AAT4608
to dissipate a larger than normal quantity of power,
and its die temperature to increase. When the die
temperature exceeds an over-temperature limit,
the AAT4608 will shut down until is has cooled sufficiently, at which point it will start up again. The
AAT4608 will continue to cycle on and off until the
load (or power) is removed.
Reverse Voltage
The AAT4608 is designed to control current flowing
from IN to OUT. If a voltage is applied to OUT which
is greater than the voltage on IN, large currents may
flow. This could cause damage to the AAT4608.
Table 1: Current Limit RSET Values.
1
0.5
0.25
0
5
Output Current
4
3
1Ω load is turned on at time = 0
Output Voltage
2
Output Current (A)
Output Voltage (V)
0.75
1
0
-0.05
0
0.05
0.1
0.15
0.2
0.25
0.3
Time (s)
Figure 1: Overload Operation.
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AAT4608
Current Limited Load Switch in SOT23 Package
Ordering Information
Package
Marking1
Part Number (Tape and Reel)2
SOT23-5
CMXYY
AAT4608IGV-T1
All AnalogicTech products are offered in Pb-free packaging. The term “Pb-free” means
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
SOT23-5
2.85 ± 0.15
1.90 BSC
0.40 ± 0.10
0.075 ± 0.075
0.15 ± 0.07
4° ± 4°
10° ± 5°
1.10 ± 0.20
0.60 REF
1.20 ± 0.25
2.80 ± 0.20
1.575 ± 0.125
0.95
BSC
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 part numbers listed in BOLD.
© Advanced Analogic Technologies, Inc.
AnalogicTech cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AnalogicTech product. No circuit patent licenses, copyrights, mask work rights,
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.
Advanced Analogic Technologies, Inc.
830 E. Arques Avenue, Sunnyvale, CA 94085
Phone (408) 737-4600
Fax (408) 737-4611
8
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