AAT4290/91
I/O Expander Load Switches with Serial Control
General Description
The AAT4290 and AAT4291 SmartSwitch products
are members of AnalogicTech鈥檚 Application
Specific Power MOSFET鈩?(ASPM鈩? product
family. The AAT4290 and AAT4291 are five and
three P-channel MOSFETs, respectively, config-
ured for use as a microprocessor I/O expander.
Having independent drain outputs and a common
source input, they operate with an input voltage
ranging from 1.8V to 5.5V, making them ideal for
2.5V, 3.3V, or 5V systems, as well as systems pow-
ered by lithium-ion/polymer batteries. Each switch
features a 500ns turn-on time. The switch states
are controlled by AnalogicTech鈥檚 Simple Serial
Control鈩?(S
2
Cwire鈩? interface which permits ease
of control and efficiency of size. The quiescent
supply current is very low, typically 5碌A(chǔ). In shut-
down mode, the supply current is reduced to less
than 1碌A(chǔ).
The AAT4290 and AAT4291 are offered in a Pb-
free, 8-pin SC70JW package specified over the
-40擄C to +85擄C temperature range.
Features
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
SmartSwitch
鈩?/div>
鈥?/div>
鈥?/div>
1.8V to 5.5V Input Voltage Range
5 or 3 Independent Load Switches
S
2
Cwire Interface
1.1鈩?R
DS(ON)
Per Switch
Low Quiescent Current
鈥?5碌A(chǔ)
鈥?0.1碌A(chǔ) in Shutdown
-40擄C to +85擄C Temperature Range
8-Pin SC70JW Package
Applications
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
鈥?/div>
Cell Phones
I/O Expansion
Multiple Low Power Switching
Personal Communication Devices
Portable Electronic Devices
Typical Application
INPUT
IN
OUT1
OUT2
OUT1
OUT2
OUT3
OUT4
OUT5
AAT4290
EN/SET
EN/SET
OUT3
OUT4
OUT5
GND
C
IN
1碌F
C
OUT1
0.1碌F
C
OUT2
0.1碌F
C
OUT3
0.1碌F
C
OUT4
0.1碌F
C
OUT5
0.1碌F
GND
GND
4290.2006.03.1.2
1
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