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AAT4611
Current Limited Load Switch in SOT-23 Package General Description
The AAT4611 SmartSwitchTM is a member of AnalogicTech's Application Specific Power MOSFETTM (ASPMTM) 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 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 1 A. 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 5 pin SOT-23 and 8pin SC70JW specified over -40 to 85C. The AAT4600 Series is a family of adjustable and fixed SmartSwitchTM with a range of current handling capabilities. Available are single versions in adj. current limit (AAT4600, AAT4601) as well as in fixed current limit (AAT4602, AAT4625). Dual versions (AAT4620, AAT4626) are also available.
Features
* * * * *
SmartSwitchTM
* * * * * * *
2.7V to 5.5V Input voltage range 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 Undervoltage Lockout Thermal shutdown Temp range -40 to 85C 4kV ESD Rating 5 pin SOT-23 or SC70JW-8 package
Preliminary Information
Applications
* * * * Peripheral ports Notebook computers Personal communication devices Hot swap supplies
Typical Application
INPUT
5
IN
AAT4611
SOT-23
1
OUTPUT
OUT
ON (ON)
4
3
ON/(ON) GND
2
SET RSET
1F
0.47F
GND
GND
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AAT4611
Current Limited Load Switch in SOT-23 Package Pin Configuration
5-Pin SOT-23 (Top View)
OUT GND SET
1 2 3
5
IN
4
ON
SC70JW-8 (Top View)
OUT GND GND GND
1 2
8 7
3 4
6 5
IN SET GND ON
1 2
Pin Descriptions
Pin #
1 2 3 4 5
Symbol
OUT GND SET ON IN
Function
P-channel MOSFET drain. Connect 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 1F capacitor from IN to GND.
2
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Current Limited Load Switch in SOT-23 Package Absolute Maximum Ratings
Symbol
VIN VON VSET, VOUT IMAX TJ TLEAD VESD
AAT4611
(TA=25C unless otherwise noted) Value
-0.3 to 6 -0.3 to VIN+0.3 -0.3 to VIN+0.3 2 -40 to 150 300 4000
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 Rating1 - HBM
Units
V V V A C C V
Note: 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. Note 1: Human body model is a 100pF capacitor discharged through a 1.5k resistor into each pin.
Thermal Characteristics
Symbol
JA PD
Description
Thermal Resistance (SOT23-5 or SC70JW-8) Power Dissipation (SOT23-5 or SC70JW-8)
Value
150 667
Units
C/W mW
Electrical Characteristics
Symbol
VIN IQ IQ(OFF) ISD(OFF) VUVLO RDS(ON) ILIM ILIM(MIN) VON(L) VON(H) ION(SINK) TRESP TOFF TON
(VIN = 5V, TA = 25C unless otherwise noted.) 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
Description
Operation Voltage Quiescent Current Off Supply Current Off Switch Current Undervoltage 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
Min
2.7
Typ
15 .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 m m A mA V V V
2.0
.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
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AAT4611
Current Limited Load Switch in SOT-23 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
Quiescent Current
40
Input ( A )
30
20
10
0 2.5 3 3.5 4 4.5 5 5.5
Temperature (C)
Input ( V )
Output Current vs VOUT
0.6
RDS(ON) vs. Temperature
250 200
Output Current ( A)
Input = 3 V Input = 5V
0.4
RDS(ON) (m)
150 100 50 0 -40 -20 0 20 40
RSET =16 k
0.2
0 0 1 2 3 4 5
60
80
100
Vout ( V )
Te mperature (C)
Off-Supply Current vs. Temperature
Off-Supply Current (A) Off-Switch Current (A)
10
10
Off-Switch Current vs. Temperature
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 )
4
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AAT4611
Current Limited Load Switch in SOT-23 Package
(Unless otherwise noted, VIN = 5V, TA = 25C)
Turn-ON vs. Temperature
80 80
Turn-ON vs. Temperature
Turn-ON Time (s)
60 50 40 30 20 10 0 - 40 - 20 0 20
Vin=3V
Turn-ON Time (s)
70
70 60 50 40 30 20 10 0 - 40 - 20 0 20 40 60 80 100
Vin=3V
Vin=5V
Vin=5V
40
60
80
100
Temperature ( C )
Temperature ( C )
Turn-On RL = 10, CL = 0.47F
6 5 6
Turn-Off RL = 10
5
I OUT =I LIMIT
Voltage ( V )
Voltage ( V )
4 3 2 1 0 -1 - 20
ON
Output
4 3 2 1 0 -1 - 0.5
IOUT =I LIMIT
ON
Output
0
20
40
60
0
0.5
1
Time (s)
Time (s)
Short Circuit through 0.3
8 12 8
Short Circuit through 0.6
9
Input and Output (V)
Input and Output (V)
6
Input Voltage Output Current
8
6
Input Voltage
6
Output (A)
4
4
4
Output Current
3
2
0
2
0
Output Voltage
0 0 1 2 3 -4
Output Voltage
0 0 1 2 3 -3
Time (s)
Time (s)
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Output (A)
AAT4611
Current Limited Load Switch in SOT-23 Package
(Unless otherwise noted, VIN = 5V, TA = 25C)
RSET vs ILIM
100 10
RSET coefficent vs I LIM
R SET I LIM Product ( kV )
9 8 7 6 5
R SET (k)
10
1 0.1
1
10
0
0.5
1
1.5
2
I LIM (A)
I LIM (A)
Current Limit v. Temperature
6%
Current Limit (%)
4% 2% 0% -2% -4% -6% -50
RSET = 22.1k V IN -VOUT=0.5V
- 25
0
25
50
75
100
Temperature (C)
6
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AAT4611
Current Limited Load Switch in SOT-23 Package Functional Block Diagram
IN
OUT
Undervoltage Lockout
Over-Temp Protection
ON (ON)
1.2V Reference Current Limit
SET
RSET GND
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AAT4611
Current Limited Load Switch in SOT-23 Package 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 3), 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 10.5k 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.
Current Limit Using 10.5 k
1.2
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 the table "Current Limit RSET Values".
Current Limit RSET Values
RSET (k ) Current Device will Limit typ not current (mA) limit below: (mA) 200 150 250 188 300 225 350 263 400 300 450 338 500 375 550 413 600 450 700 525 800 600 900 675 1000 750 1100 825 1200 900 1300 975 1400 1050 Device always current limits below: (mA) 250 313 375 438 500 563 625 688 750 875 1000 1125 1250 1375 1500 1625 1750
1
0.88 A
Device with high current limit at -40 C
0.8
0.6
0.4
0.525 A Device with low current limit at 85 C
0.2
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
I LIM (A)
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 typical current limit value. Choose the largest resistor available
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 11k. 10.5 k is a standard value that is a little less than 11k but very close. The chart reads approximately 0.700A as a typical ILIM value for 10.5k. Multiplying 0.700A 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.
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AAT4611
Current Limited Load Switch in SOT-23 Package
Overload Operation
1 0.75 0.5
Output ( V )
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 1 load is turned on at time = 0 Output Voltage
Tim e ( s )
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 the figure "Overload Operation". 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 its 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 startup 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).
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 5 volt TTL, and 2.5 volt to 5 volt CMOS.
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.
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Output (A)
9
AAT4611
Current Limited Load Switch in SOT-23 Package Package Information
SOT-23-5
e
Dim
S1
E
H
D
A A1 S b
I
c L
A A1 A2 b c D E e H L S S1
Millimeters Min Max 0.95 1.45 0.05 0.15 0.90 1.30 0.35 0.50 0.08 0.20 2.84 3.00 1.50 1.70 1.90 2.60 3.00 0.35 0.55 0.47 0.55 .95 0 10
Inches Min Max 0.037 0.057 0.002 0.006 0.035 0.051 0.014 0.019 0.003 0.078 0.112 0.112 0.059 0.067 0.0748 0.102 0.118 .0137 .0216 0.019 .0216 0.037 0 10
SC70JW-8
e e e
Dim E E1 L A A1 A2 D e b c 1
E
b D 0.048REF c A2 A
Millimeters Min Max 2.10 BSC 1.75 2.00 0.23 0.40 1.10 0 0.10 0.70 1.00 2.00 BSC 0.50 BSC 0.15 0.30 0.10 0.20 0 8 4 10
Inches Min Max 0.083 BSC 0.069 0.079 0.009 0.016 0.043 0.004 0.028 0.039 0.079 BSC 0.020 BSC 0.006 0.012 0.004 0.008 0 8 4 10
A1 1 L E1
10
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AAT4611
Current Limited Load Switch in SOT-23 Package Ordering Information
Package SOT-23-5 SOT-23-5 SC70JW-8 SC70JW-8 Enable ON (active low) ON (active high) ON (active low) ON (active high) Marking Part Number Bulk N/A N/A N/A N/A Tape and Reel AAT4611IGV-T1 AAT4611IGV-1-T1 AAT4611IJS-T1 AAT4611IJS-1-T1
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AAT4611
Current Limited Load Switch in SOT-23 Package
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Advanced Analogic Technologies, Inc.
1250 Oakmead Parkway, Suite 310, Sunnyvale, CA 94086 Phone (408) 524-9684 Fax (408) 524-9689 12
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