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Current Limited Load Switch in SOT23 Package General Description
The AAT4611 SmartSwitch is a current limited Pchannel MOSFET power switch designed for highside 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 AAT4611 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 15A max. In shutdown mode, the supply current decreases to less than 1A. The AAT4611 is available in a Pb-free 5-pin SOT23 package and is specified over the -40C to +85C temperature range.
AAT4611
Features
* * * * * * * * * * *
SmartSwitchTM
Input Voltage Range: 2.7V to 5.5V Programmable Over-Current Threshold Fast Transient Response: -- <1s Response to Short Circuit Low Quiescent Current -- 15A Typical -- 1A Max with Switch Off 160m Typical RDS(ON) Only 2.5V Needed for ON/OFF Control Under-Voltage Lockout Thermal Shutdown 4kV ESD Rating 5-Pin SOT23 Package Temperature Range: -40C to +85C
Applications
* * * * Hot Swap Supplies Notebook Computers Peripheral Ports Personal Communication Devices
Typical Application
INPUT IN OUT
OUTPUT
AAT4611
ON (ON) ON/(ON) GND 1F RSET 0.47F SET
GND
GND
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Current Limited Load Switch in SOT23 Package Pin Descriptions
Pin #
1 2 3 4 5
AAT4611
Symbol
OUT GND SET ON IN
Function
P-channel MOSFET drain. Connect a 0.47F capacitor from OUT to GND. Ground connection. Current limit set input. A resistor from SET to ground sets the current limit for the switch. Enable input. Two versions are available, active-high and active-low. See Ordering Information for details. P-channel MOSFET source. Connect a 1F capacitor from IN to GND.
Pin Configuration
SOT23-5 (Top View)
OUT GND SET
1
5
IN
2
3
4
ON
2
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Current Limited Load Switch in SOT23 Package Absolute Maximum Ratings1
TA = 25C, unless otherwise noted. Symbol
VIN VON VSET, VOUT IMAX TJ TLEAD VESD
AAT4611
Description
IN to GND ON(ON) to GND SET, OUT to GND Maximum Continuous Switch Current Operating Junction Temperature Range Maximum Soldering Temperature (at leads) ESD Rating2 - HBM
Value
-0.3 to 6 -0.3 to VIN + 0.3 -0.3 to VIN + 0.3 2 -40 to 150 300 4000
Units
V V V A C C V
Thermal Characteristics3
Symbol
JA PD
Description
Thermal Resistance Power Dissipation
Value
150 667
Units
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 1.5k resistor into each pin. 3. Mounted on a demo board. 4611.2006.09.1.4
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Current Limited Load Switch in SOT23 Package Electrical Characteristics
VIN = 5V, TA = -40C to +85C, unless otherwise noted. Typical values are TA = 25C. Symbol
VIN IQ IQ(OFF) ISD(OFF) VUVLO RDS(ON) ILIM ILIM(MIN) VON(L) VON(H) ION(SINK) TRESP TOFF TON
AAT4611
Description
Operation Voltage Quiescent Current Off-Supply Current Off-Switch Current Under-Voltage Lockout On Resistance Current Limit Minimum Current Limit ON (ON) Input Low Voltage ON (ON) Input High Voltage ON (ON) Input Leakage Current Limit Response Time Turn-Off Time Turn-On Time
Conditions
VIN = 5V, ON (ON) = Active, IOUT = 0 ON (ON) = Inactive, VIN = 5.5V ON (ON) = Inactive, VIN = 5.5V, VOUT = 0 Rising Edge, 1% Hysteresis VIN = 5.0V VIN = 4.5V VIN = 3.0V RSET = 6.8k
Min
2.7
Typ
15 0.03 2.3 160 165 195 1 130
Max
5.5 30 1 15 2.7 180 230 1.25 195 0.8
Units
V A A A V m A mA V V
2.0
0.75
VIN = 2.7V to 3.6V VIN = 4.5V to 5.5V VON = 5.5V VIN = 5V VIN = 5V, RL = 10 VIN = 5V, RL = 10
2.0 2.4 0.01 0.8 0.4 40 1 2 200
A s s s
4
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Current Limited Load Switch in SOT23 Package Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25C.
Quiescent Current vs. Temperature
Quiescent Current (A)
25 20 15 10 5 0 -40 -20 0 20 40 60 80 100 120
AAT4611
Quiescent Current
40
Input Current (A)
30
20
10
0 2.5 3 3.5 4 4.5 5 5.5
Temperature (C)
Input Voltage (V)
Output Current vs. Output Voltage (RSET = 16k)
0.6
RDS(ON) vs. Temperature
250 200
Input = 3V Input = 5V
Output Current (A)
0.4
RDS(ON) (m)
150 100 50 0
0.2
0 0 1 2 3 4 5
-40
-20
0
20
40
60
80
100
Output Voltage (V)
Temperature (C)
Off-Supply Current vs. Temperature
10 10
Off-Switch Current vs. Temperature
Off-Switch Current (A)
Off-Supply Current (A)
1
1
0.1
0.1
0.01
0.01 -40
-20
0
20
40
60
80
100
120
0.001 -40
-20
0
20
40
60
80
100
120
Temperature (C)
Temperature (C)
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Current Limited Load Switch in SOT23 Package Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25C.
AAT4611
Turn-On vs. Temperature
80 0.45 0.4
Turn-Off vs. Temperature
Turn-On Time (s)
Turn-Off Time (s)
70 60 50 40 30 20 10 0 - 40 - 20 0 20 40 60 80 100
VIN = 3V
0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 - 40
VIN = 3V
VIN = 5V
VIN = 5V
- 20
0
20
40
60
80
100
Temperature (C)
Temperature (C)
Turn-On (RL = 10; CL = 0.47F; IOUT = ILIMIT)
6 5
Turn-Off
(RL = 10; IOUT = ILIMIT)
6 5
3 2 1 0 -1 - 20
Voltage (V)
Voltage (V)
4
ON
Output
4 3 2 1 0 -1 - 0.5
ON
Output
0
20
40
60
0
0.5
1
Time (s)
Time (s)
Short-Circuit Through 0.3
Input and Output Voltage (V)
Input and Output Voltage (V)
8 12 8
Short-Circuit Through 0.6
9
Output Current (A)
Output Current (A)
6
Input Voltage
8
6
Input Voltage
6
4
Output Current
4
4
3
Output Current
2 0
2
0
Output Voltage
0 0 1 2 3 -4
Output Voltage
0 0 1 2 3 -3
Time (s)
Time (s)
6
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Current Limited Load Switch in SOT23 Package Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25C.
AAT4611
RSET vs. ILIM
100 10
RSET Coefficient vs. ILIM
RSET ILIM Product (kV)
9 8 7 6 5
RSET (k)
10
1 0.1
1
10
0
0.5
1
1.5
2
ILIM (A)
ILIM (A)
Current Limit vs. Temperature
(RSET = 22.1k; VIN - VOUT = 0.5V)
6%
Current Limit (%)
4% 2% 0% -2% -4% -6% -50
- 25
0
25
50
75
100
Temperature (C)
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Current Limited Load Switch in SOT23 Package Functional Block Diagram
AAT4611
IN
OUT
UnderVoltage Lockout
Over-Temperature Protection
ON (ON)
1.2V Reference Current Limit
SET
RSET GND
Applications Information
Setting Current Limit
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) and the operating temperature. See charts "Current Limit vs. Temperature" and "Output Current vs. Output Voltage." Together, these three factors add up to a 25% tolerance (see ILIM specification in Electrical Characteristics section). In Figure 1, a cold device with a statistically higher current limit and a hot device with a statistically lower current limit, both with RSET equal to 10.5k, are shown. While the chart, "RSET vs. ILIM" indicates an ILIM of 0.7A with an RSET of 10.5k, this figure shows that the actual current limit will be at least 0.525A and no greater than 0.880A.
ILIM (A)
1.2
1
0.88A
Device With High Current Limit at -40C
0.8
0.6
0.4
0.525A
Device With Low Current Limit at 85C
0.2
0 0 1 2 3 4 5
Output Voltage (V)
Figure 1: Current Limit Using 10.5k. 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 typical 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.
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Current Limited Load Switch in SOT23 Package
ILIM." The maximum current is derived by multiplying the typical current for the chosen RSET in the chart by 1.25. Some standard resistor values are listed in Table 1. Current Device Will Device Always Limit Not Current Current Limits (Typ) Limit Below Below (mA) (mA) (mA)
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
AAT4611
typical ILIM value for 10.5k. Multiplying 0.7A by 0.75 and 1.25 shows that the AAT4611 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 AAT4611, the load current is limited to the value of ILIM determined by RSET (see Figure 2). Since the load is demanding more current than ILIM, the voltage at the output drops. This causes the AAT4611 to dissipate a larger-than-normal quantity of power, and causes the die temperature to increase. When the die temperature exceeds an over-temperature limit, the AAT4611 will shut down until is has cooled sufficiently, at which point it will start up again. The AAT4611 will continue to cycle on and off until the load is removed, power is removed, or until a logic high level is applied to ON (Pin 4).
RSET (k)
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
Enable Input
In many systems, power planes are controlled by integrated circuits which run at lower voltages than the power plane itself. The enable input ON (Pin 4) of the AAT4611 has low and high threshold voltages that accommodate this condition. The threshold voltages are compatible with 5V TTL and 2.5V to 5V CMOS.
Table 1: Current Limit RSET Values. Example: A USB port requires 0.5A. 0.5A multiplied by 1.33 is 0.665A. From the chart "RSET vs. ILIM," RSET should be less than 11k. 10.5 k is a standard value that is slightly less than, but very close to, 11k. The chart gives approximately 0.7A as a
Reverse Voltage
The AAT4611 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 AAT4611.
1 0.75
Output Voltage (V)
0.5 0.25 0 5 4 3 2 1 0 -0.05 0 0.05 0.1 0.15 0.2 0.25 0.3
Output Current (A)
Output Current 1 Load is Turned On at Time = 0 Output Voltage
Time (s)
Figure 2: Overload Operation.
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Current Limited Load Switch in SOT23 Package Ordering Information
Package
SOT23-5 SOT23-5
AAT4611
Enable
ON (active low) ON (active high)
Marking1
CLXYY
Part Number (Tape and Reel)2
AAT4611IGV-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 0.95 BSC
1.575 0.125
1.10 0.20
0.60 REF
2.80 0.20
1.20 0.25
0.15 0.07
4 4
GAUGE PLANE
10 5
0.40 0.10
0.075 0.075
0.60 REF
0.45 0.15
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.
(c) 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. 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 10
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