AAT AAT4611IGV-T1 Current limited load switch in sot23 package Datasheet

AAT4611
Current Limited Load Switch in SOT23 Package
General Description
Features
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 15µA max. In shutdown mode, the
supply current decreases to less than 1µA.
•
•
•
The AAT4611 is available in a Pb-free 5-pin SOT23
package and is specified over the -40°C to +85°C
temperature range.
•
•
•
•
•
•
•
•
SmartSwitch™
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
160mΩ 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
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
4611.2006.09.1.4
RSET
0.47µF
GND
1
AAT4611
Current Limited Load Switch in SOT23 Package
Pin Descriptions
Pin #
Symbol
Function
1
OUT
P-channel MOSFET drain. Connect a 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
ON
Enable input. Two versions are available, active-high and active-low. See
Ordering Information for details.
5
IN
P-channel MOSFET source. Connect a 1µF capacitor from IN to GND.
Pin Configuration
2
SOT23-5
(Top View)
OUT
1
GND
2
SET
3
5
IN
4
ON
4611.2006.09.1.4
AAT4611
Current Limited Load Switch in 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
ΘJA
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 1.5kΩ resistor into each pin.
3. Mounted on a demo board.
4611.2006.09.1.4
3
AAT4611
Current Limited Load Switch in 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 = 6.8kΩ
VIN = 2.7V to 3.6V
VIN = 4.5V to 5.5V
VON = 5.5V
VIN = 5V
VIN = 5V, RL = 10Ω
VIN = 5V, RL = 10Ω
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
mΩ
230
1.25
195
0.8
2.0
2.4
A
mA
V
V
0.01
0.8
0.4
40
1
2
200
µA
µs
µs
µs
4611.2006.09.1.4
AAT4611
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
0
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
30
20
10
0
2.5
3
3.5
Output Current vs. Output Voltage
(RSET = 16kΩ)
5
5.5
250
Input = 3V
200
RDS(ON) (mΩ)
Output Current (A)
4.5
RDS(ON) vs. Temperature
0.6
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
Temperature (°C)
4611.2006.09.1.4
80
100
120
1
0.1
0.01
0.001
-40
-20
0
20
40
60
80
100
120
Temperature (°C)
5
AAT4611
Current Limited Load Switch in 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)
ON
Output
3
2
1
3
2
1
0
0
-1
- 20
-1
- 0.5
40
60
ON
Output
0
Time (µs)
2
0
Output Voltage
0
-4
2
3
Input and Output Voltage (V)
4
Output Current
Time (µs)
6
8
9
8
6
6
Input Voltage
3
4
Output Current
0
2
Output Voltage
Output Current (A)
Input Voltage
Output Current (A)
Input and Output Voltage (V)
12
1
1
Short-Circuit Through 0.6Ω
8
0
0.5
Time (µs)
Short-Circuit Through 0.3Ω
4
100
4
Voltage (V)
Voltage (V)
6
5
6
80
Turn-Off
6
20
60
(RL = 10Ω; IOUT = ILIMIT)
5
0
40
Temperature (°C)
Turn-On
(RL = 10Ω; CL = 0.47μF; IOUT = ILIMIT)
4
20
-3
0
0
1
2
3
Time (µs)
4611.2006.09.1.4
AAT4611
Current Limited Load Switch in SOT23 Package
Typical Characteristics
Unless otherwise noted, VIN = 5V, TA = 25°C.
RSET Coefficient vs. ILIM
RSET vs. ILIM
10
RSET ILIM Product (kV)
RSET (kΩ)
100
10
9
8
7
6
5
1
0.1
1
10
0
0.5
1
1.5
2
ILIM (A)
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)
4611.2006.09.1.4
7
AAT4611
Current Limited Load Switch in SOT23 Package
Functional Block Diagram
IN
OUT
Over-Temperature
Protection
UnderVoltage
Lockout
ON (ON)
1.2V
Reference
Current
Limit
SET
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 10.5kΩ, 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.
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)
Ω.
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 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.
4611.2006.09.1.4
AAT4611
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.
RSET
Ω)
(kΩ
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
typical ILIM value for 10.5kΩ. 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
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
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).
250
313
375
438
500
563
625
688
750
875
1000
1125
1250
1375
1500
1625
1750
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 11kΩ. 10.5 kΩ is a standard value that is slightly less than, but very close
to, 11kΩ. The chart gives approximately 0.7A as a
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.
4611.2006.09.1.4
9
AAT4611
Current Limited Load Switch in SOT23 Package
Ordering Information
Package
Enable
Marking1
Part Number (Tape and Reel)2
SOT23-5
ON (active low)
CLXYY
AAT4611IGV-T1
SOT23-5
ON (active high)
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.
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
4611.2006.09.1.4
Similar pages