AAT4290A/91A
I/O Expander Load Switches with Serial ControlSmartSwitchTM
PRODUCT DATASHEET
4290A.2009.07.1.3 1
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General Description
The AAT4290A and AAT4291A SmartSwitch products are
members of AnalogicTech’s Application Specific Power
MOSFET™ (ASPM™) product family. The AAT4290A and
AAT4291A are five and three P-channel MOSFETs, respec-
tively, configured for use as a microprocessor I/O
expander. Having independent drain outputs and a com-
mon 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 powered by
lithium-ion/polymer batteries. Each switch features a
500ns turn-on time. The switch states are controlled by
a Simple Serial Control™ (S2Cwire™) interface which per-
mits ease of control and efficiency of size. The quiescent
supply current is very low, typically 4.5μA. In shutdown
mode, the supply current is reduced to less than 1μA.
The AAT4290A and AAT4291A are offered in a Pb-free,
8-pin SC70JW package specified over the -40°C to
+85°C temperature range.
Features
• 1.8V to 5.5V Input Voltage Range
• 5 or 3 Independent Load Switches
• S
2Cwire Interface
• 1.1Ω RDS(ON) Per Switch
• Low Quiescent Current
▪ 4.5μA Typical
▪ 0.1μA in Shutdown
• -40°C to +85°C Temperature Range
• 8-Pin SC70JW Package
Applications
• Cell Phones
• I/O Expansion
• Multiple Low Power Switching
• Personal Communication Devices
• Portable Electronic Devices
Typical Application
OUT1
AAT4290AOUT2
OUT3
OUT4
OUT5
IN
EN/SET
GND
COUT1 COUT2 COUT3 COUT4 COUT5
CIN
1μF 0.1μF 0.1μF 0.1μF 0.1μF 0.1μF
INPUT
EN/SET
GND
OUT1
OUT2
OUT3
OUT4
OUT5
GND
AAT4290A/91A
I/O Expander Load Switches with Serial ControlSmartSwitchTM
PRODUCT DATASHEET
2 4290A.2009.07.1.3
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Pin Descriptions
Pin #
Symbol Function
AAT4290A AAT4291A
11IN
Input power supply is connected to the P-channel MOSFET sources. Connect a 1μF
capacitor from IN to GND.
2 7 OUT2 P-channel MOSFET drain.
3 6 OUT1 P-channel MOSFET drain.
4 4 EN/SET
Input control pin using S2Cwire serial interface. The device records rising edges of the
clock and decodes them into 32 states (8 states for AAT4291A) which controls the
ON/OFF states of the MOSFETs. See Table 1 and Table 2 for output settings.
5 5 GND Ground connection.
6 N/A OUT5 P-channel MOSFET drain.
7 N/A OUT4 P-channel MOSFET drain.
8 8 OUT3 P-channel MOSFET drain.
N/A 2, 3 N/C Not connected.
Pin Configuration
AAT4290A AAT4291A
SC70JW-8 SC70JW-8
(Top View) (Top View)
OUT2
OUT1
EN/SET
OUT3
OUT4
OUT5
GND
IN 1
2
3
45
6
7
8
N/C
N/C
EN/SET
OUT3
OUT2
OUT1
GND
IN 1
2
3
45
6
7
8
AAT4290A/91A
I/O Expander Load Switches with Serial ControlSmartSwitchTM
PRODUCT DATASHEET
4290A.2009.07.1.3 3
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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 to each pin.
3. Mounted on the board.
4. Derate 4.4mW/°C above 25°C.
Absolute Maximum Ratings1
Symbol Description Value Units
VIN IN to GND -0.3 to 6.0 V
VOUT OUT to GND -0.3 to VIN + 0.3 V
VEN/SET EN/SET to GND -0.3 to 6.0 V
IMAX Maximum Continuous Switch Current 250 mA
TSTORAGE Storage Temperature Range -65 to 150 °C
VESD ESD Rating - HBM24000 V
Thermal Characteristics
Symbol Description Value Units
θJA Thermal Resistance3225 °C/W
PDMaximum Power Dissipation (TA = 25°C)4440 mW
AAT4290A/91A
I/O Expander Load Switches with Serial ControlSmartSwitchTM
PRODUCT DATASHEET
4 4290A.2009.07.1.3
www.analogictech.com
1. The AAT4290A/91A is guaranteed to meet performance specifications over the -40°C to +85°C operating temperature range and is assured by design, characterization, and
correlation with statistical process controls.
Electrical Characteristics
VIN = 5.0V, TA = -40°C to +85°C, unless otherwise noted. Typical values are TA = 25°C.
Symbol Description Conditions Min Typ Max Units
VIN Operation Voltage 1.8 5.5 V
IQQuiescent Current VIN = 5.5V, EN/SET = VIN, IOUT = 0, All
Switches ON 4.5 8 μA
IQ(OFF) Off Supply Current EN/SET = 0, VIN = 5.5V, VOUT Open 1 μA
ISD(OFF) Off Switch Current EN/SET = 0, VIN = 5.5V, VOUTn = 0 0.1 1 μA
VUVLO Under-Voltage Lockout VIN Falling 1.2 V
VUVLO(hys) Under-Voltage Lockout Hysteresis 250 mV
RDS(ON) On Resistance
VIN = 1.8V, TA = 25°C 2.5 3.8
Ω
VIN = 3.0V, TA = 25°C 1.5 2.2
VIN = 4.2V, TA = 25°C 1.2 1.8
VIN = 5.0V, TA = 25°C 1.1 1.7
TCRDS On Resistance Temperature Coeffi cient 2800 ppm°C
AAT4290A-1 and AAT4291A-1
TD(ON) Output Turn-On Delay Time VIN = 5V, RLOAD = 500Ω, COUT = 0.1μF40 ns
TRTurn-On Rise Time VIN = 5V, RLOAD = 500Ω, COUT = 0.1μF 270 ns
TD(OFF) Turn-Off Delay Time VIN = 5V, RLOAD = 500Ω40 ns
EN/SET
VEN(L) Enable Threshold Low VIN = 1.8V 0.4 V
VEN(H) Enable Threshold High VIN = 5.5V 1.6 V
TLO EN/SET Low Time VEN/SET < 0.4V 100 ns
THI Minimum EN/SET High Time VIN ≤ 2.5V 500 ns
VIN > 2.5V 250
TOEN/SET Off Timeout 2.6 4.0 μs
TLAT EN/SET Latch Timeout 2.6 4.0 μs
ISINK EN/SET Input Leakage VEN/SET = 5.5V 0.01 1 μA
AAT4290A/91A
I/O Expander Load Switches with Serial ControlSmartSwitchTM
PRODUCT DATASHEET
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Typical Characteristics
Unless otherwise noted, VIN = 5V, CIN = 1μF, C OUTX = 0.1μF, TA = 25°C.
Quiescent Current vs. Temperature
-40 -20 0 20 40 60 80 100
Temperature (°
°
C)
IQ (
μ
A)
2
2.5
3
3.5
4
4.5
5
5.5
6
VIN = 5.0V
VIN = 3.3V
Quiescent Current vs. Input Voltage
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
IQ (μ
μ
A)
1.5
2
2.5
3
3.5
4
4.5
5
5.5
VIH and VIL vs. Input Voltage
Input Voltage (V)
VIH and VIL (V)
VIL
VIH
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
1.2
1.5 2.523.534.545.55
RDS(ON) vs. Input Voltage
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
RDS(ON) (ΩΩ)
0.7
0.9
1.1
1.3
1.5
1.7
1.9
2.1
2.3
2.5
2.7
IO1-5 = 100mA
R
DS1
R
DS2
R
DS5
R
DS3
R
DS4
RDS(ON) vs. Temperature
Temperature (°
°
C)
RDS(ON) (
Ω
)
-40 -20 0 20 40 60 80 100
0.7
0.8
0.9
1
1.1
1.2
1.3
VIN = 5.0V
IO1-5 = 50mA
RDS1
RDS2
RDS3
RDS4
RDS5
RDS(ON) vs. Temperature
0.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
-40 -20 0 20 40 60 80 100
Temperature (°
°
C)
RDS(ON) (
Ω
)
VIN = 5.0V
IO1-5 = 100mA
RDS3
RDS4
RDS5
RDS1
RDS2
AAT4290A/91A
I/O Expander Load Switches with Serial ControlSmartSwitchTM
PRODUCT DATASHEET
6 4290A.2009.07.1.3
www.analogictech.com
Typical Characteristics
Unless otherwise noted, VIN = 5V, CIN = 1μF, C OUTX = 0.1μF, TA = 25°C.
EN/SET Latch Timeout vs. Temperature
-40-200 2040 6080100
Temperature (°
°
C)
Latch Timeout, tLAT (
μ
s)
2.2
2.4
2.6
2.8
3
3.2
3.4
VIN = 5.0V
VIN = 3.3V
EN/SET Off Timeout vs. Temperature
-40 -20 0 20 40 60 80 100
Temperature (°
°
C)
Off Timeout, tO (μs)
2.2
2.4
2.6
2.8
3
3.2
3.4
VIN = 3.3V
VIN = 5.0V
EN/SET Timeout vs. Input Voltage
1.5 2 2.5 3 3.5 4 4.5 5 5.5
Input Voltage (V)
Timeout (μ
μ
s)
2.5
2.7
2.9
3.1
3.3
3.5
3.7
3.9
4.1
4.3
Off Timeout tO
Latch Timeout tLAT
Turn-On Characteristic
(VIN = 5V, RL1 = RL2 = 50Ω
Ω
; CO1 = CO2 = 0.1
μ
F)
Time (2μs/div)
EN/SET
(5V/div)
VO1
(5V/div)
VO2
(5V/div)
Turn-On Characteristic
(VIN = 5V; RL1 = RL2 = 50Ω
Ω
; CO1 = CO2 = 0.1
μ
F)
Time (2μs/div)
EN/SET
(5V/div)
VO1
(5V/div)
VO2
(5V/div)
Turn-On Characteristic
(VIN = 5V; RL1 = RL2 = 50Ω
Ω
; CO1 = CO2 = 0.1
μ
F)
Time (2μs/div)
EN/SET
(5V/div)
VO1
(5V/div)
VO2
(5V/div)
AAT4290A/91A
I/O Expander Load Switches with Serial ControlSmartSwitchTM
PRODUCT DATASHEET
4290A.2009.07.1.3 7
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Typical Characteristics
Unless otherwise noted, VIN = 5V, CIN = 1μF, C OUTX = 0.1μF, TA = 25°C.
Turn-On Characteristic
(VIN = 5V; RL1 = RL2 = 50Ω
Ω
; CO1 = CO2 = 0.1
μ
F)
Time (2μs/div)
EN/SET
(5V/div)
VO1
(5V/div)
VO2
(5V/div)
Turn-Off Characteristic
(VIN = 5V; RL1 = RL2 = 50Ω
Ω
; CO1 = CO2 = 0.1
μ
F)
Time (2μs/div)
EN/SET
(5V/div)
VO1
(5V/div)
VO2
(5V/div)
Transition of Outputs
(VIN = 5V; RL1 = RL2 = 50Ω
Ω
; CO1 = CO2 = 0.1
μ
F)
Time (2μs/div)
EN/SET
(5V/div)
VO1
(5V/div)
VO2
(5V/div)
Time (5μ
μ
s/div)
EN/SET
(5V/div)
VO1
(5V/div)
VO2
(100mV/div,
A
C coupled)
Turn-On Transient Characteristic
(VIN = 5V; RL1 = RL2 = 50
Ω
)
AAT4290A/91A
I/O Expander Load Switches with Serial ControlSmartSwitchTM
PRODUCT DATASHEET
8 4290A.2009.07.1.3
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Functional Description
The AAT4290A consists of five P-channel MOSFET power
switches designed for I/O expansion applications. The
AAT4291A has all of the features offered in the AAT4290A,
but integrates three switches instead of five. It operates
with input voltages ranging from 1.8V to 5.5V which,
along with its extremely low operating current, makes it
ideal for battery-powered applications. In cases where
the input voltage drops below 1.8V, the AAT4290A
MOSFETs are protected from entering the linear region of
operation by automatically shutting down. In addition,
the TTL-compatible EN/SET pin makes the AAT4290A an
ideal level-shifted load switch. An optional slew rate con-
trolling feature eliminates in-rush current when a MOSFET
is turned on, allowing the AAT4290A to be implemented
with a small input capacitor or no capacitor at all, while
maintaining isolation between channels. During slewing,
the current ramps linearly until it reaches the level
required for the output load condition. The proprietary
control method works by careful control and monitoring
of the MOSFET gate voltage. When the device is switched
ON, the gate voltage is quickly increased to the threshold
level of the MOSFET. Once at this level, the current
begins to slew as the gate voltage is slowly increased
until the MOSFET becomes fully enhanced. Once it has
reached this point, the gate is quickly increased to the
full input voltage and RDS(ON) is minimized.
The ON/OFF state of the five MOSFET switches are con-
trolled by the EN/SET serial data input. An internal con-
trol counter is clocked on the rising edge of the EN/SET
pin and is decoded into the 32 possible states of the
MOSFET (see Table 1). The counter rolls over after 32
clocks and the table repeats. The counter can be clocked
at speeds up to 1MHz, but the count value is not latched
until clocking has stopped and the EN/SET pin has
remained high for approximately 2.6μs. The first rising
edge of EN/SET enables the AAT4290A and is counted as
the first clock. To change states, additional low going
clock pulses may be asserted on the EN/SET pin with the
resulting change taking effect after the EN/SET pin has
remained in a high state for TLAT
. The AAT4290A is dis-
abled after the EN/SET pin has transitioned and remained
in a logic low state for TO.
With the exception of three channel power switches, the
AAT4291A has a similar function to the AAT4290A. The
ON/OFF state of the three MOSFET switches are con-
trolled by the EN/SET serial data input. An internal con-
trol counter is clocked on the rising edge of the EN/SET
pin and is decoded into the eight possible states of the
MOSFET (see Table 2). The counter rolls over after eight
clocks and the table repeats.
Functional Block Diagram
GND
Control Logic
and Level Shift
S2Cwire Interface
*AAT4290A only
IN OUT1
OUT2
OUT3
OUT4*
OUT5*
EN/SET
UVLO
ROM
AAT4290A/91A
I/O Expander Load Switches with Serial ControlSmartSwitchTM
PRODUCT DATASHEET
4290A.2009.07.1.3 9
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Clock OUT5 OUT4 OUT3 OUT2 OUT1
1on on ononon
2 on on on on off
3 on on on off on
4 on on on off off
5 on on off on on
6 on on off on off
7 on on off off on
8 on on off off off
9 on off on on on
10 on off on on off
11 on off on off on
12 on off on off off
13 on off off on on
14 on off off on off
15 on off off off on
16 on off off off off
17 off on on on on
18 off on on on off
19 off on on off on
20 off on on off off
21 off on off on on
22 off on off on off
23 off on off off on
24 off on off off off
25 off off on on on
26 off off on on off
27 off off on off on
28 off off on off off
29 off off off on on
30 off off off on off
31 off off off off on
32 off off off off off
Table 1: AAT4290A Output Settings.
Clock OUT3 OUT2 OUT1
1ononon
2 on on off
3 on off on
4 on off off
5 off on on
6 off on off
7 off off on
8 off off off
Table 2: AAT4291A Output Settings.
Applications Information
Thermal Considerations
The AAT4290A is designed to deliver continuous output
load currents. Due to its high level of integration, care
must be taken in designing for higher load conditions. If
greater loads are required, outputs can be tied together
to deliver higher power to a given load.
At 25°C ambient, the AAT4290A is capable of dissipating
440mW of power, or 1.14A at 5.0V, for an average cur-
rent of 228mA per output.
At 85°C ambient, the AAT4290A is capable of dissipating
178mW of power, or 0.72A at 5.0V, for an average cur-
rent of 145mA per output.
Output Sequencing
If output sequencing is not necessary, then all of the
outputs will be switched on simultaneously on the first
rising edge of the EN/SET pin. However, if output
sequencing is desired, then a series of pulses on the EN/
SET pin will accomplish this. Each time a new group of
pulses is asserted on EN/SET, the AAT4290A/91A inter-
nal control is reset. For example, to sequence the out-
puts in order from OUT5 to OUT1, five clocks bursts are
input on the EN/SET pin. From Table 1, the first burst of
16 clocks turns on OUT5. A following burst of 8 clocks
(as the counter resets) will add OUT4, followed by 4
clocks to add OUT3, 2 clocks to add OUT2, and 1 clock
to add OUT1. Likewise, the outputs can be turned off in
any order by adding more clock bursts.
Timing Diagram
THI TLO TLAT TD(ON) TO
TRTD(OFF)
OUTn
EN/SET
AAT4290A/91A
I/O Expander Load Switches with Serial ControlSmartSwitchTM
PRODUCT DATASHEET
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Applications Circuits
Function 1
Function 2
Function 3
Function 4
Function 5
System
μController
GPIO 1
VSUPPLY
1.8 to 5.5V
GPIO 2
GPIO 3
GPIO 4
GPIO 5
EN 1
EN 2
EN 3
EN 4
EN 5
GPIO 2
to
GPIO 5
are now free for
other uses
EN/SET
IN OUT1
OUT2
OUT3
OUT4
OUT5
AAT4290A
Figure 1: GPIO I/O Expander
(condense five GPIO control lines to one).
VBATTERY
10μF
1μF
10μF
RRR
GRB
BR G
ON/OFF
CLOCK
VIN VOUT
C+
C-
GND GND
IN
OUT1
OUT2
OUT3
EN/SETSHDN
RGB LED
AAT3110IJS-5.0
SC70JW-8: 2x2mm
AAT4291AIJS
SC70JW-8: 2x2mm
Figure 2: RGB LED Control
(eliminates three discrete MOSFET switches).
AAT4290A/91A
I/O Expander Load Switches with Serial ControlSmartSwitchTM
PRODUCT DATASHEET
4290A.2009.07.1.3 11
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Advanced Analogic Technologies, Inc.
3230 Scott Boulevard, Santa Clara, CA 95054
Phone (408) 737-4600
Fax (408) 737-4611
© 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 specifi cations or to discontinue any product or service without notice. Except as provided in AnalogicTech’s terms and
conditions of sale, AnalogicTech assumes no liability whatsoever, and AnalogicTech disclaims any express or implied warranty relating to the sale and/or use of AnalogicTech products including liability or warranties
relating to fi tness for a particular purpose, merchantability, or infringement of any patent, copyright or other intellectual property right. In order to minimize risks associated with the customer’s applications, adequate
design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. Testing and other quality control techniques are utilized to the extent AnalogicTech deems necessary to
support this warranty. Specifi c 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.
1. XYY = assembly and date code.
2. Sample stock is generally held on part numbers listed in BOLD.
Ordering Information
Package Marking1Part Number (Tape and Reel)2
SC70JW-8 OQXYY AAT4290AIJS-1-T1
SC70JW-8 OPXYY AAT4291AIJS-1-T1
Package Information
SC70JW-8
0.225
±
0.075
0.45
±
0.10
0.05
±
0.05
2.10
±
0.30
2.00
±
0.20
7
°
±
3
°
4
°
±
4
°
1.75
±
0.10
0.85
±
0.15
0.15
±
0.05
1.10 MAX
0.100
2.20
±
0.20
0.048REF
0.50 BSC 0.50 BSC 0.50 BSC
All dimensions in millimeters.
