AAT4291 [AAT]
I/O Expander Load Switches with Serial Control; I / O扩展负载开关具有串行控制
| 型号： | AAT4291 |
| 厂家： | 
ADVANCED ANALOG TECHNOLOGY, INC. |
| 描述： | I/O Expander Load Switches with Serial Control |
| 文件： | 总12页 (文件大小：242K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AAT4290/91
I/O Expander Load Switches with Serial Control
™
SmartSwitch
General Description
Features
The AAT4290 and AAT4291 SmartSwitch products
are members of AnalogicTech’s Application
Specific Power MOSFET™ (ASPM™) 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’s Simple Serial
Control™ (S2Cwire™) interface which permits ease
of control and efficiency of size. The quiescent
supply current is very low, typically 5µA. In shut-
down mode, the supply current is reduced to less
than 1µA.
•
•
•
•
•
1.8V to 5.5V Input Voltage Range
5 or 3 Independent Load Switches
S2Cwire Interface
1.1Ω RDS(ON) Per Switch
Low Quiescent Current
— 5µA
— 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
The AAT4290 and AAT4291 are offered in a Pb-
free, 8-pin SC70JW package specified over the
-40°C to +85°C temperature range.
Typical Application
INPUT
OUT1
OUT2
OUT3
OUT4
OUT5
IN
OUT1
OUT2
OUT3
OUT4
OUT5
AAT4290
EN/SET
EN/SET
GND
CIN
1µF
COUT1
0.1µF
COUT2
0.1µF
COUT3
0.1µF
COUT4
0.1µF
COUT5
0.1µF
GND
GND
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AAT4290/91
I/O Expander Load Switches with Serial Control
Pin Descriptions
Pin #
AAT4290
AAT4291
Symbol
Function
1
1
IN
Input power supply is connected to the P-channel MOSFET
sources. Connect a 1µF capacitor from IN to GND.
2
3
4
7
6
4
OUT2
OUT1
P-channel MOSFET drain.
P-channel MOSFET drain.
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 AAT4291) which controls the ON/OFF
states of the MOSFETs. See Table 1 and Table 2 for out-
put settings.
5
6
5
GND
OUT5
OUT4
OUT3
N/C
Ground connection.
N/A
N/A
8
P-channel MOSFET drain.
P-channel MOSFET drain.
P-channel MOSFET drain.
Not connected.
7
8
N/A
2, 3
Pin Configuration
AAT4290
SC70JW-8
(Top View)
AAT4291
SC70JW-8
(Top View)
8
7
6
5
8
7
6
5
1
2
3
4
1
2
3
4
OUT3
OUT4
OUT5
GND
OUT3
OUT2
OUT1
GND
IN
OUT2
OUT1
IN
N/C
N/C
EN/SET
EN/SET
2
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AAT4290/91
I/O Expander Load Switches with Serial Control
Absolute Maximum Ratings1
Symbol
Description
Value
Units
VIN
VOUT
IN to GND
-0.3 to 6.0
-0.3 to VIN + 0.3
-0.3 to 6.0
250
V
V
OUT to GND
VEN/SET
IMAX
TSTORAGE
VESD
EN/SET to GND
V
Maximum Continuous Switch Current
Storage Temperature Range
ESD Rating - HBM2
mA
°C
V
-65 to 150
4000
Thermal Characteristics
Symbol
Description
Value
Units
θJA
PD
Thermal Resistance3
Maximum Power Dissipation (TA = 25°C)4
225
440
°C/W
mW
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 to each pin.
3. Mounted on the board.
4. Derate 4.4mW/°C above 25°C.
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AAT4290/91
I/O Expander Load Switches with Serial Control
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
IQ
Operation Voltage
Quiescent Current
1.8
5.5
8
V
V
IN = 5.5V, EN/SET = VIN, IOUT = 0,
4.5
µA
All Switches ON
IQ(OFF)
ISD(OFF)
VUVLO
Off Supply Current
EN/SET = 0, VIN = 5.5V, VOUT Open
EN/SET = 0, VIN = 5.5V, VOUTn = 0
VIN Falling
1
1
µA
µA
V
Off Switch Current
0.1
1.2
250
2.5
1.5
1.2
1.1
Under-Voltage Lockout
Under-Voltage Lockout Hysteresis
VUVLO(hys)
mV
VIN = 1.8V, TA = 25°C
3.8
2.2
1.8
1.7
V
IN = 3.0V, TA = 25°C
RDS(ON)
On Resistance
Ω
VIN = 4.2V, TA = 25°C
VIN = 5.0V, TA = 25°C
On Resistance Temperature
Coefficient
TCRDS
2800
ppm°C
AAT4290-1 and AAT4291-1
TD(ON)
TR
Output Turn-On Delay Time
VIN = 5V, RLOAD = 500Ω, COUT = 0.1µF
VIN = 5V, RLOAD = 500Ω, COUT = 0.1µF
VIN = 5V, RLOAD = 500Ω
40
270
40
ns
ns
ns
Turn-On Rise Time
Turn-Off Delay Time
TD(OFF)
EN/SET
VEN(L)
VEN(H)
TLO
Enable Threshold Low
Enable Threshold High
EN/SET Low Time
VIN = 1.8V
VIN = 5.5V
VEN/SET < 0.4V
VIN ≤ 2.5V
VIN > 2.5V
0.4
V
V
1.6
100
ns
500
250
4.0
4.0
1
THI
Minimum EN/SET High Time
ns
TO
EN/SET Off Timeout
EN/SET Latch Timeout
EN/SET Input Leakage
2.6
2.6
µs
µs
µA
TLAT
ISINK
VEN/SET = 5.5V
0.01
1. The AAT4290/91 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.
4
4290.2006.03.1.2
AAT4290/91
I/O Expander Load Switches with Serial Control
Typical Characteristics
Unless otherwise noted, VIN = 5V, CIN = 1µF, COUTX = 0.1µF, TA = 25°C.
Quiescent Current vs. Temperature
Quiescent Current vs. Input Voltage
6
5.5
5
5.5
5
VIN = 5.0V
4.5
4
4.5
4
3.5
3
3.5
3
V
IN = 3.3V
2.5
2
2.5
2
1.5
-40
-20
0
20
40
60
80
100
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
Temperature (°C)
Input Voltage (V)
VIH and VIL vs. Input Voltage
RDS(ON) vs. Input Voltage
2.7
1.4
IO1-5 = 100mA
2.5
2.3
2.1
1.9
1.7
1.5
1.3
1.1
0.9
0.7
1.3
1.2
1.1
1
VIH
RDS5
RDS1
RDS2
0.9
0.8
0.7
0.6
0.5
VIL
RDS3
RDS4
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
1.5
2
2.5
3
3.5
4
4.5
5
5.5
Input Voltage (V)
Input Voltage (V)
RDS(ON) vs. Temperature
RDS(ON) vs. Temperature
1.3
1.4
VIN = 5.0V
IO1-5 = 50mA
VIN = 5.0V
IO1-5 = 100mA
1.3
1.2
1.1
1.0
0.9
0.8
0.7
1.2
1.1
1
RDS2
RDS2
RDS1
RDS1
RDS5
RDS5
0.9
0.8
0.7
RDS4
RDS4
RDS3
RDS3
-40
-20
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
Temperature (°C)
Temperature (°C)
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AAT4290/91
I/O Expander Load Switches with Serial Control
Typical Characteristics
Unless otherwise noted, VIN = 5V, CIN = 1µF, COUTX = 0.1µF, TA = 25°C.
EN/SET Off Timeout vs. Temperature
EN/SET Latch Timeout vs. Temperature
3.4
3.2
3
3.4
3.2
3
VIN = 3.3V
2.8
2.6
2.4
2.2
2.8
2.6
2.4
2.2
VIN = 3.3V
VIN = 5.0V
V
IN = 5.0V
-40
-20
0
20
40
60
80
100
-40
-20
0
20
40
60
80
100
Temperature (°C)
Temperature (°C)
Turn-On Characteristic
(VIN = 5V, RL1 = RL2 = 50Ω; CO1 = CO2 = 0.1µF)
EN/SET Timeout vs. Input Voltage
4.3
4.1
3.9
3.7
3.5
3.3
3.1
2.9
2.7
2.5
VO2
(5V/div)
VO1
(5V/div)
Off Timeout tO
EN/SET
(5V/div)
Latch Timeout tLAT
1.5
2
2.5
3
3.5
4
4.5
5
5.5
Input Voltage (V)
Time (2µs/div)
Turn-On Characteristic
(VIN = 5V; RL1 = RL2 = 50Ω; CO1 = CO2 = 0.1µF)
Turn-On Characteristic
(VIN = 5V; RL1 = RL2 = 50Ω; CO1 = CO2 = 0.1µF)
VO2
VO2
(5V/div)
(5V/div)
VO1
VO1
(5V/div)
(5V/div)
EN/SET
(5V/div)
EN/SET
(5V/div)
Time (2µs/div)
Time (2µs/div)
6
4290.2006.03.1.2
AAT4290/91
I/O Expander Load Switches with Serial Control
Typical Characteristics
Unless otherwise noted, VIN = 5V, CIN = 1µF, COUTX = 0.1µF, TA = 25°C.
Turn-On Characteristic
(VIN = 5V; RL1 = RL2 = 50Ω; CO1 = CO2 = 0.1µF)
Turn-Off Characteristic
(VIN = 5V; RL1 = RL2 = 50Ω; CO1 = CO2 = 0.1µF)
VO2
VO2
(5V/div)
(5V/div)
VO1
VO1
(5V/div)
(5V/div)
EN/SET
(5V/div)
EN/SET
(5V/div)
Time (2µs/div)
Time (2µs/div)
Transition of Outputs
(VIN = 5V; RL1 = RL2 = 50Ω; CO1 = CO2 = 0.1µF)
Turn-On Transient Characteristic
(VIN = 5V; RL1 = RL2 = 50Ω)
VO2
(100mV/div,
AC coupled)
VO2
(5V/div)
VO1
(5V/div)
VO1
(5V/div)
EN/SET
(5V/div)
EN/SET
(5V/div)
Time (2µs/div)
Time (5µs/div)
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AAT4290/91
I/O Expander Load Switches with Serial Control
Functional Block Diagram
OUT1
OUT2
OUT3
OUT4*
IN
OUT5*
UVLO
Control Logic
and Level Shift
ROM
S2Cwire Interface
EN/SET
GND
*AAT4290 only
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.
Functional Description
The AAT4290 consists of five P-channel MOSFET
power switches designed for I/O expansion appli-
cations. The AAT4291 has all of the features
offered in the AAT4290, but integrates three
switches instead of five. It operates with input volt-
ages 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 AAT4290
MOSFETs are protected from entering the linear
region of operation by automatically shutting down.
In addition, the TTL-compatible EN/SET pin makes
the AAT4290 an ideal level-shifted load switch. An
optional slew rate controlling feature eliminates in-
rush current when a MOSFET is turned on, allow-
ing the AAT4290 to be implemented with a small
input capacitor or no capacitor at all, while main-
taining isolation between channels. During slew-
ing, the current ramps linearly until it reaches the
level required for the output load condition. The
proprietary control method works by careful control
The ON/OFF state of the five MOSFET switches
are controlled by the EN/SET serial data input. An
internal control 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 AAT4290 and is
counted as the first clock. To change states, addi-
tional low going clock pulses may be asserted on
the EN/SET pin with the resulting change taking
8
4290.2006.03.1.2
AAT4290/91
I/O Expander Load Switches with Serial Control
effect after the EN/SET pin has remained in a high
With the exception of three channel power switch-
es, the AAT4291 has a similar function to the
AAT4290. The ON/OFF state of the three MOS-
FET switches are controlled by the EN/SET serial
data input. An internal control counter is clocked
on the rising edge of the EN/SET pin and is decod-
ed into the eight possible states of the MOSFET
(see Table 2). The counter rolls over after eight
clocks and the table repeats.
state for TLAT. The AAT4290 is disabled after the
EN/SET pin has transitioned and remained in a
logic low state for TO.
Clock OUT5 OUT4 OUT3 OUT2 OUT1
1
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
on
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
off
on
on
on
on
on
on
on
on
off
off
off
off
off
off
off
off
on
on
on
on
on
on
on
on
off
off
off
off
off
off
off
off
on
on
on
on
off
off
off
off
on
on
on
on
off
off
off
off
on
on
on
on
off
off
off
off
on
on
on
on
off
off
off
off
on
on
off
off
on
on
off
off
on
on
off
off
on
on
off
off
on
on
off
off
on
on
off
off
on
on
off
off
on
on
off
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
on
off
2
3
4
Clock
OUT3
OUT2
OUT1
5
1
2
3
4
5
6
7
8
on
on
on
on
off
off
off
off
on
on
off
off
on
on
off
off
on
off
on
off
on
off
on
off
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
Table 2: AAT4291 Output Settings.
Applications Information
Thermal Considerations
The AAT4290 is designed to deliver continuous
output load currents. Due to its high level of inte-
gration, care must be taken in designing for higher
load conditions. If greater loads are required, out-
puts can be tied together to deliver higher power to
a given load.
At 25°C ambient, the AAT4290 is capable of dissi-
pating 440mW of power, or 1.14A at 5.0V, for an
average current of 228mA per output.
At 85°C ambient, the AAT4290 is capable of dissi-
pating 178mW of power, or 0.72A at 5.0V, for an
average current of 145mA per output.
Table 1: AAT4290 Output Settings.
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9
AAT4290/91
I/O Expander Load Switches with Serial Control
Timing Diagram
OUTn
TR
TD(ON)
TO
TD(OFF)
THI
TLO
TLAT
EN/SET
to sequence the outputs 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.
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 out-
put 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
AAT4290/91 internal control is reset. For example,
10
4290.2006.03.1.2
AAT4290/91
I/O Expander Load Switches with Serial Control
Applications Circuits
VSUPPLY
1.8 to 5.5V
AAT4290
IN
OUT1
Function 1
Function 2
Function 3
Function 4
Function 5
EN 1
EN 2
EN 3
EN 4
EN 5
EN/SET
GPIO 1
OUT2
OUT3
OUT4
OUT5
System
µController
GPIO 2
GPIO 2
to
GPIO 5
GPIO 3
GPIO 4
GPIO 5
are now free for
other uses
Figure 1: GPIO I/O Expander
(condense five GPIO control lines to one).
AAT3110IJS-5.0
SC70JW-8: 2x2mm
AAT4291IJS
SC70JW-8: 2x2mm
VIN
IN
VOUT
C+
OUT1
OUT2
OUT3
VBATTERY
10µF
10µF
RGB LED
G
R
B
1µF
ON/OFF
SHDN
C-
EN/SET
GND
GND
RR
RG
RB
CLOCK
Figure 2: RGB LED Control
(eliminates three discrete MOSFET switches).
4290.2006.03.1.2
11
AAT4290/91
I/O Expander Load Switches with Serial Control
Ordering Information
Package
Marking1
Part Number (Tape and Reel)2
SC70JW-8
SC70JW-8
HSXYY
HCXYY
AAT4290IJS-1-T1
AAT4291IJS-1-T1
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
SC70JW-8
0.50 BSC 0.50 BSC 0.50 BSC
0.225 0.075
2.00 0.20
0.048REF
0.100
0.45 0.10
4° 4°
7° 3°
2.10 0.30
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 con-
trol 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.
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830 E. Arques Avenue, Sunnyvale, CA 94085
Phone (408) 737-4600
Fax (408) 737-4611
12
4290.2006.03.1.2
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