201938A.pdf

DATA SHEET
AAT4611
Current Limited Load Switch in an SOT23 Package
General Description
Features
The AAT4611 SmartSwitch 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 1A.
Current limit threshold is programmed with a resistor
from SET to ground. The quiescent supply current is
typically a low 15μA max. In shutdown mode, the supply
current decreases to less than 1μA.
• Input Voltage Range: 2.7V to 5.5V
• Programmable Over-Current Threshold
• Fast Transient Response:
▪ <1μs Response to Short Circuit
• Low Quiescent Current
▪ 15μA Typical
▪ 1μA 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: -40°C to +85°C
The AAT4611 is available in a Pb-free 5-pin SOT23 package and is specified over the -40°C to +85°C temperature range.
Applications
•
•
•
•
Hot Swap Supplies
Notebook Computers
Peripheral Ports
Personal Communication Devices
Typical Application
INPUT
OUTPUT
IN
OUT
AAT4611
ON (ON)
SET
ON/(ON)
GND
1μF
GND
RSET
0.47μF
GND
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1
DATA SHEET
AAT4611
Current Limited Load Switch in an SOT23 Package
Pin Descriptions
Pin #
Symbol
1
2
3
OUT
GND
SET
4
ON
5
IN
Function
P-channel MOSFET drain. Connect a 0.47μF 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 1μF capacitor from IN to GND.
Pin Configuration
SOT23-5
(Top View)
2
OUT
1
GND
2
SET
3
5
IN
4
ON
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DATA SHEET
AAT4611
Current Limited Load Switch in an SOT23 Package
Absolute Maximum Ratings1
TA = 25°C, unless otherwise noted.
Symbol
Description
VIN
VON
VSET, VOUT
IMAX
TJ
TLEAD
VESD
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
Units
-0.3 to 6
-0.3 to VIN + 0.3
-0.3 to VIN + 0.3
2
-40 to 150
300
4000
V
V
V
A
°C
°C
V
Value
Units
150
667
°C/W
mW
Thermal Characteristics3
Symbol
JA
PD
Description
Thermal Resistance
Power Dissipation
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.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET
AAT4611
Current Limited Load Switch in an SOT23 Package
Electrical Characteristics
VIN = 5V, TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C.
Symbol
VIN
IQ
4
Description
IQ(OFF)
ISD(OFF)
VUVLO
Operation Voltage
Quiescent Current
Off-Supply Current
Off-Switch Current
Under-Voltage Lockout
RDS(ON)
On Resistance
ILIM
ILIM(MIN)
VON(L)
Current Limit
Minimum Current Limit
ON (ON) Input Low Voltage
VON(H)
ON (ON) Input High Voltage
ION(SINK)
TRESP
TOFF
TON
ON (ON) Input Leakage
Current Limit Response Time
Turn-Off Time
Turn-On Time
Conditions
Min
Typ
2.7
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
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
15
2.0
0.75
0.03
2.3
160
165
195
1
130
Max
Units
5.5
30
1
15
2.7
180
V
μA
μA
μA
V
m
230
1.25
195
0.8
2.0
2.4
A
mA
V
V
0.01
0.8
0.4
40
1
2
200
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μA
μs
μs
μs
DATA SHEET
AAT4611
Current Limited Load Switch in an SOT23 Package
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Quiescent Current (μA)
Quiescent Current vs. Temperature
Quiescent Current vs. Input Voltage
40
Input Current (μA)
25
20
15
10
5
30
20
10
0
0
-40
-20
0
20
40
60
80
100
2.5
120
3
3.5
Temperature (°C)
Output Current vs. Output Voltage
5
5.5
250
0.6
Input = 3V
200
RDS(ON) (mΩ)
Output Current ( A)
4.5
RDS(ON) vs. Temperature
(RSET = 16kΩ)
0.4
0.2
150
Input = 5V
100
50
0
0
0
1
2
3
4
-40
5
-20
0
Off-Supply Current vs. Temperature
40
60
80
100
Off-Switch Current vs. Temperature
10
Off-Switch Current (μA)
10
1
0.1
0.01
-40
20
Temperature (°C)
Output Voltage (V)
Off-Supply Current (μA)
4
Input Voltage (V)
-20
0
20
40
60
80
Temperature (°C)
100
120
1
0.1
0.01
0.001
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET
AAT4611
Current Limited Load Switch in an SOT23 Package
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
Turn-On vs. Temperature
Turn-Off vs. Temperature
0.45
0.4
Turn-Off Time (μs)
Turn-On Time (μs)
80
70
VIN = 3V
60
50
40
30
VIN = 5V
20
10
VIN = 3V
0.35
0.3
0.25
VIN = 5V
0.2
0.15
0.1
0.05
0
0
- 40
- 20
0
20
40
60
80
- 40
100
- 20
0
Temperature (°C)
Turn On
Turn Off
(RL = 10Ω; CL = 0.47μF; IOUT = ILIMIT)
(RL = 10Ω; IOUT = ILIMIT)
5
80
100
5
ON
Output
4
Voltage (V)
Voltage (V)
60
6
4
3
2
1
3
2
1
ON
Output
0
0
-1
- 20
0
20
40
-1
- 0.5
60
0
Time (μs)
8
4
Output Current
4
0
Output Voltage
0
-4
2
Time (μs)
3
( )
2
8
9
Input Voltage
6
4
6
3
Output Current
2
0
Output Voltage
0
-3
0
1
2
Time (μs)
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Output Current (A)
Input Voltage
p
6
Input and Output Voltage (V)
12
1
1
Short-Circuit Through 0.6Ω
8
0
0.5
Time (μs)
Short-Circuit Through 0.3Ω
Input and Output Voltage (V)
40
Temperature (°C)
6
6
20
DATA SHEET
AAT4611
Current Limited Load Switch in an 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
(RSET = 22.1kΩ; VIN - VOUT = 0.5V)
Current Limit (%)
6
4
2
0
-2
-4
-6
-50
- 25
0
25
50
75
100
Temperature (°C)
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET
AAT4611
Current Limited Load Switch in an SOT23 Package
Functional Block Diagram
IN
OUT
UnderVoltage
Lockout
Over-Temperature
Protection
ON (ON)
1.2V
Reference
SET
Current
Limit
RSET
GND
Applications Information
1.2
Setting Current Limit
8
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)
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.
Device With High Current Limit at -40°C
0.88A
1
0.6
0.525A
0.4
Device With Low Current Limit at 85°C
0.2
0
0
1
2
3
4
5
Output Voltage (V)
Figure 1: Current Limit Using 10.5kΩ.
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
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201938A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 7, 2012
DATA SHEET
AAT4611
Current Limited Load Switch in an SOT23 Package
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.
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.
RSET
(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
gives approximately 0.7A as a 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).
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.
Reverse Voltage
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
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
0.5
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 2: Overload Operation.
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
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DATA SHEET
AAT4611
Current Limited Load Switch in an SOT23 Package
Ordering Information
Package
Enable
Marking1
Part Number (Tape and Reel)2
SOT23-5
SOT23-5
ON (active low)
ON (active high)
CLXYY
AAT4611IGV-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
SOT23-5
2.85 ± 0.15
1.90 BSC
0.075 ± 0.075
10°° ± 5°°
0.40 ± 0.10
0.15 ± 0.07
GAUGE PLANE
4°° ± 4°°
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
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.
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10
Skyworks Solutions, Inc. • Phone [781] 376-3000 • Fax [781] 376-3100 • sales@skyworksinc.com • www.skyworksinc.com
201938A • Skyworks Proprietary Information • Products and Product Information are Subject to Change Without Notice. • May 7, 2012