Slew Rate Controlled Load Switch
General Description
The AAT4280 SmartSwitch is a P-channel MOSFET
power switch designed for high-side load switching
applications. The P-channel MOSFET device has a
typical R
DS(ON)
of 80mΩ, allowing increased load
switch power handling capacity. This device is avail-
able in three different versions with flexible turn on
and off characteristics from very fast to slew rate lim-
ited. The standard AAT4280 (-1) version has a slew
rate limited turn on load switch and is functionally
compatible with the AAT4250 device while offering
superior R
DS(ON)
characteristics. The AAT4280 (-2)
version features fast load switch turn on capabilities,
typically less than 500ns turn on and 3µs turn off
times. The AAT4280 (-3) variation offers a shutdown
load discharge circuit to rapidly turn off a load circuit
when the switch is disabled. All AAT4280 load switch
versions operate with an input voltage ranging from
1.8V to 5.5V, making them ideal for both 3V and 5V
systems. The AAT4280 also features an under-volt-
age lockout which turns the switch off when an input
under-voltage condition exists. Input logic levels are
TTL and 2.5V to 5V CMOS compatible. The quies-
cent supply current is very low, typically 2.5µA. In
shutdown mode, the supply current decreases to
less than 1µA.
The AAT4280 is available in a Pb-free, 6-pin
SOT23 or 8-pin SC70JW package and is specified
over the -40°C to +85°C temperature range.
AAT4280
Features
•
•
•
SmartSwitch
™
•
•
•
•
•
•
1.8V to 5.5V Input Voltage Range
Very Low R
DS(ON)
, Typically 80mΩ (5V)
Slew Rate Limited Turn-On Time Options
— 1ms
— 0.5µs
— 100µs
Fast Shutdown Load Discharge Option
Low Quiescent Current
— 2.5µA Typical
— 1µA Max in Shutdown
TTL/CMOS Input Logic Level
Temperature Range: -40ºC to +85°C
4kV ESD Rating
6-Pin SOT23 or 8-Pin SC70JW Package
Applications
•
•
•
•
•
•
Cellular Telephones
Digital Still Cameras
Hot Swap Supplies
Notebook Computers
Personal Communication Devices
Personal Digital Assistants (PDA)
Typical Application
V
IN
IN
IN
C
IN
1μF
ON
ON/OFF
GND
GND
OUT
V
OUT
AAT4280
C
OUT
0.1μF
GND
GND
4280.2006.11.1.4
1
Slew Rate Controlled Load Switch
Absolute Maximum Ratings
1
T
A
= 25°C, unless otherwise noted.
Symbol
V
IN
V
ON
V
OUT
I
MAX
I
DM
T
J
T
S
T
LEAD
V
ESD
AAT4280
Description
IN to GND
ON/OFF to GND
OUT to GND
Maximum Continuous Switch Current
Maximum Pulsed Current
Operating Junction Temperature Range
Storage Temperature Range
Maximum Soldering Temperature (at leads)
ESD Rating
2
- HBM
IN
≥
2.5V
IN < 2.5V
Value
-0.3 to 6
-0.3 to 6
-0.3 to V
IN
+ 0.3
2.3
6
3
-40 to 150
-65 to 150
300
4000
Units
V
V
V
A
A
A
°C
°C
°C
V
Thermal Characteristics
3
Value
Symbol
Θ
JA
P
D
Description
Thermal Resistance
Power Dissipation
SOT23-6
SC70JW-8
Units
°C/W
mW
120
833
140
714
1. Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional operation at condi-
tions 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 an AAT4280 demo board in still 25ºC air.
4280.2006.11.1.4
3
Slew Rate Controlled Load Switch
Electrical Characteristics
V
IN
= 5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are T
A
= 25°C.
Symbol
Description
Conditions
Min
1.8
1
1.0
AAT4280
Typ
Max
5.5
1.8
4
1
1
120
130
150
250
Units
V
V
mV
µA
µA
µA
mΩ
AAT4280 All Versions
V
IN
Operation Voltage
V
UVLO
Under-Voltage Lockout
V
UVLO(hys)
Under-Voltage Lockout Hysteresis
I
Q
Quiescent Current
I
Q(OFF)
Off Supply Current
I
SD(OFF)
Off Switch Current
R
DS(ON)
On Resistance
V
IN
Falling
ON/OFF = Active
ON/OFF = Inactive, OUT = Open
ON/OFF = Inactive, V
OUT
= 0
V
IN
= 5V, T
A
= 25°C
V
IN
= 4.2V, T
A
= 25°C
V
IN
= 3V, T
A
= 25°C
V
IN
= 1.8V, T
A
= 25°C
1.4
250
2.5
80
85
100
160
2800
TC
RDS
V
IL
V
IH
On Resistance Temperature
Coefficient
ON/OFF Input Logic Low Voltage
ON/OFF Input Logic High Voltage
ppm/°C
0.8
V
V
1
µA
µs
µs
µs
µs
µs
µs
µs
µs
µs
Ω
I
SINK
ON/OFF Input Leakage
AAT4280-1
T
D(ON)
Output Turn-On Delay
T
ON
Output Turn-On Rise Time
T
D(OFF)
Output Turn-Off Delay Time
AAT4280-2
T
D(ON)
Output Turn-On Delay
T
ON
Output Turn-On Rise Time
T
D(OFF)
Output Turn-Off Delay Time
AAT4280-3
T
D(ON)
Output Turn-On Delay
T
ON
Output Turn-On Rise Time
T
D(OFF)
Output Turn-Off Delay Time
Output Pull-Down Resistance
R
PD
During OFF
V
IN
= 2.7V to 5.5V
2
V
IN
= 2.7V to
≤
4.2V
V
IN
= 3.3V
V
IN
= >4.2V to 5.5V
V
ON/OFF
= 5.5V
V
IN
= 5V, R
LOAD
= 10Ω, T
A
= 25°C
V
IN
= 5V, R
LOAD
= 10Ω, T
A
= 25°C
V
IN
= 5V, R
LOAD
= 10Ω, T
A
= 25°C
V
IN
= 5V, R
LOAD
= 10Ω, T
A
= 25°C
V
IN
= 5V, R
LOAD
= 10Ω, T
A
= 25°C
V
IN
= 5V, R
LOAD
= 10Ω, T
A
= 25°C
V
IN
= 5V, R
LOAD
= 10Ω, T
A
= 25°C
V
IN
= 5V, R
LOAD
= 10Ω, T
A
= 25°C
V
IN
= 5V, R
LOAD
= 10Ω, T
A
= 25°C
ON/OFF = Inactive, T
A
= 25°C
2
1.8
2.4
20
1000
4
0.5
0.5
4
20
100
4
150
40
1500
10
2
1
10
40
150
10
250
1. Part requires minimum start-up of V
IN
≥
2.0V to ensure operation down to 1.8V.
2. For V
IN
outside this range, consult typical ON/OFF threshold curve.
4
4280.2006.11.1.4
Slew Rate Controlled Load Switch
Typical Characteristics
Unless otherwise noted, V
IN
= 5V, T
A
= 25°C.
AAT4280
Quiescent Current vs. Temperature
4
3.5
Quiescent Current vs. Input Voltage
Quiescent Current (μA)
Quiescent Current (μA)
80
100
3
V
IN
= 5V
3.0
2.5
2.0
1.5
1.0
0.5
0.0
2
1
V
IN
= 3V
0
-40
-20
0
20
40
60
0
1
2
3
4
5
6
Temperature (°C)
Input Voltage (V)
R
DS(ON)
vs. Input Voltage
190
170
R
DS(ON)
vs. Temperature
120
2A
110
R
DS(ON)
(mΩ)
150
130
110
90
70
1.5
2.0
R
DS(ON)
(mΩ)
1A
500mA
100mA
100
90
80
70
60
50
V
IN
= 3V
V
IN
= 5V
2.5
3.0
3.5
4.0
4.5
5.0
5.5
40
-40
-20
0
20
40
60
80
100
Input Voltage (V)
Temperature (°C)
ON/OFF Threshold vs. Input Voltage
ON/OFF Threshold (V)
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
Off-Switch Current vs. Temperature
1.000
V
IL
I
OFFSW
(μA)
V
IH
0.100
0.010
Input Voltage (V)
0.001
-40
-20
0
20
40
60
80
100
Temperature (°C)
4280.2006.11.1.4
5
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