SmartSwitch
TM
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, mak-
ing it ideal for both 3V and 5V systems. An inte-
grated current-limiting circuit protects the input sup-
ply against large currents which may cause the sup-
ply to fall out of regulation. The AAT4611 is also pro-
tected from thermal overload which limits power dis-
sipation 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 cur-
rent decreases to less than 1A.
The AAT4611 is available in a 5 pin SOT-23 and 8-
pin SC70JW specified over -40 to 85C.
The AAT4600 Series is a family of adjustable and
fixed SmartSwitchTM with a range of current han-
dling capabilities. Available are single versions in
adj. current limit (AAT4600, AAT4601) as well as in
fixed current limit (AAT4602, AAT4625). Dual ver-
sions (AAT4620, AAT4626) are also available.
Features
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 R
DS(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
Applications
Peripheral ports
Notebook computers
Personal communication devices
Hot swap supplies
AAT4611
Current Limited Load Switch in SOT-23 Package
Typical Application
AAT4611
5
4
2
3
1
ON/(ON)
IN
SET
INPUT
GND
GND
GND
OUT
SOT-23
OUTPUT
ON (ON)
0.47
F
R
SET
1
F
Preliminary
Information
4611.2001.8.0.9
1
AAT4611
Current Limited Load Switch in SOT-23 Package
2
4611.2001.8.0.9
Pin Configuration
5-Pin SOT-23
(Top View)
SC70JW-8
(Top View)
Pin Descriptions
Pin #
Symbol
Function
1
OUT
P-channel MOSFET drain. Connect 0.47F 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 order-
ing information for details.
5
IN
P-channel MOSFET source. Connect 1F capacitor from IN to GND.
GND
GND
GND
1
2
IN
SET
GND
ON
OUT
1
2
3
4
8
7
6
5
1
2
3
SET
OUT
4
5
GND
IN
ON
AAT4611
Current Limited Load Switch in SOT-23 Package
4611.2001.8.0.9
3
Absolute Maximum Ratings
(T
A
=25C unless otherwise noted)
Note: Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at con-
ditions 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
Electrical Characteristics
(V
IN
= 5V, T
A
= 25C unless otherwise noted.)
Symbol
Description
Conditions
Min
Typ Max Units
V
IN
Operation Voltage
2.7
5.5
V
I
Q
Quiescent Current
V
IN
= 5V, ON (ON) = active, I
OUT
= 0
15
30
A
I
Q(OFF)
Off Supply Current
ON (ON) =inactive, V
IN
= 5.5V
1
A
I
SD(OFF)
Off Switch Current
ON (ON) = inactive, V
IN
= 5.5V, V
OUT
= 0
.03
15
A
V
UVLO
Undervoltage Lockout
Rising edge, 1% hysteresis,
2.0
2.3
2.7
V
V
IN
=5.0V
160
180
m
R
DS(ON)
On-Resistance V
IN
=4.5V
165
m
V
IN
=3.0V
195
230
m
I
LIM
Current Limit
R
SET
= 6.8k
.75
1
1.25
A
I
LIM(MIN)
Minimum Current Limit
130
195
mA
V
ON(L)
ON (ON) Input Low Voltage
0.8
V
V
ON(H)
ON (ON) Input High Voltage
V
IN
=2.7V to 3.6V
2.0
V
V
IN
=4.5V to 5.5V
2.4
V
I
ON(SINK)
ON (ON) Input leakage
V
ON
= 5.5V
0.01
1
A
T
RESP
Current Limit Response Time
V
IN
=5V 0.8
s
T
OFF
Turn-Off Time
V
IN
=5V, R
L
=10
0.4
2
s
T
ON
Turn-On Time
V
IN
=5V, R
L
=10
40
200
s
Symbol
Description
Value
Units
JA
Thermal Resistance (SOT23-5 or SC70JW-8)
150
C/W
P
D
Power Dissipation (SOT23-5 or SC70JW-8)
667
mW
Symbol
Description
Value
Units
V
IN
IN to GND
-0.3 to 6
V
V
ON
ON(ON) to GND
-0.3 to V
IN
+0.3
V
V
SET,
V
OUT
SET, OUT to GND
-0.3 to V
IN
+0.3
V
I
MAX
Maximum Continuous Switch Current
2
A
T
J
Operating Junction Temperature Range
-40 to 150
C
T
LEAD
Maximum Soldering Temperature (at Leads)
300
C
V
ESD
ESD Rating
1
- HBM
4000
V
Typical Characteristics
(Unless otherwise noted, V
IN
= 5V, T
A
= 25C)
Off-Switch Current vs. Temperature
Temperature (C )
Off-Switch
Current
(
A)
0.001
0.01
0.1
1
10
-40
-20
0
20
40
60
80
100
120
Off-Supply Current vs. Temperature
0.01
0.1
1
10
-40
-20
0
20
40
60
80
100
120
Temperature (C )
Off-Supply
C
urrent
(
A)
R
DS(ON)
vs. Temperature
0
50
100
150
200
250
-40
-20
0
20
40
60
80
100
Te
R
DS(ON)
(m
)
mperature (C)
Input = 3 V
Input = 5 V
Output Current vs
V
OUT
0
0.2
0.4
0.6
0
1
2
3
4
5
Vout ( V )
Output
Current
(A)
R
SET
=16 k
Quiescent Current
0
10
20
30
40
2.5
3
3.5
4
4.5
5
5.5
Input ( V )
Input (
A
)
Quiescent Current vs. Temperature
0
5
10
15
20
25
-40
-20
0
20
40
60
80
100
120
Temperature
Quiescent Current (
A)
(C)
AAT4611
Current Limited Load Switch in SOT-23 Package
4
4611.2001.8.0.9
(Unless otherwise noted, V
IN
= 5V, T
A
= 25C)
Short Circuit through 0.6
0
2
4
6
8
0
1
2
3
Time (
s)
Input
and
Output
-3
0
3
6
9
Output (A)
Output Current
Input Voltage
Output Voltage
(V)
Short Circuit through 0.3
0
2
4
6
8
0
1
2
3
Time (
s)
Input
and
Output
-4
0
4
8
12
Output (A)
Output Current
Input Voltage
Output Voltage
(V)
-1
0
1
2
3
4
5
6
- 0.5
0
0.5
1
Time (
s)
Voltage
(
V
)
Output
ON
I
OUT
=I
LI MIT
Turn-Off
R
L
= 10
Turn-On
R
L
= 10
, C
L
= 0.47
F
-1
0
1
2
3
4
5
6
- 20
0
20
40
60
Time (
s)
Voltage
(
V
)
Output
ON
I
OUT
=I
LIM IT
Turn-ON vs. Temperature
0
10
20
30
40
50
60
70
80
- 40
- 20
0
20
40
60
80
100
Temperature ( C )
Turn-ON
Time
(
s)
Vin=5V
Vin=3V
Turn-ON vs. Temperature
0
10
20
30
40
50
60
70
80
- 40
- 20
0
20
40
60
80
100
Temperature ( C )
Turn-ON
Time
(
s)
Vin=5V
Vin=3V
AAT4611
Current Limited Load Switch in SOT-23 Package
4611.2001.8.0.9
5
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