AAT4291 [ANALOGICTECH]
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 ANALOGIC TECHNOLOGIES |
| 描述： | I/O Expander Load Switches with Serial Control |
| 文件： | 总12页 (文件大小：232K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AAT4290/4291
I/O Expander Load Switches with Serial Control
™
SmartSwitch
General Description
Features
The AAT4290 and AAT4291 SmartSwitch™ prod-
ucts 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 a Simple Serial Control™
(S2Cwire™) interface which permits ease of control
and efficiency of size. The quiescent supply cur-
rent is very low, typically 5µA. In shutdown mode,
the supply current is reduced to less than 1µA.
•
•
•
•
•
•
1.8V to 5.5V Input Voltage Range
5 or 3 Independent Load Switches
Optional 200µS Slew Rate Control
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 an 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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AAT4290/4291
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 MOSFETs
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
7
8
5
GND
OUT5
OUT4
OUT3
Ground connection.
N/A
N/A
8
P-channel MOSFET drain.
P-channel MOSFET drain.
P-channel MOSFET drain.
Pin Configuration
AAT4290
(SC70JW-8)
AAT4291
(SC70JW-8)
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
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AAT4290/4291
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
mA
°C
V
-65 to 150
4000
2
ESD Rating - HBM
Notes:
1: Stresses above those listed in Absolute Maximum Ratings may cause permanent damage to the device. Functional conditions 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.
Thermal Characteristics
Symbol
Description
Value
Units
3
θJA
PD
Thermal Resistance
225
440
°C/W
mW
4
Maximum Power Dissipation (TA = 25°C)
Note 3: Mounted on the board.
Note 4: Derate 4.4mW/°C above 25°C.
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AAT4290/4291
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 at TA = 25°C.
Symbol Description
Conditions
Min Typ Max Units
VIN
IQ
Operation Voltage
Quiescent Current
1.8
5.5
8
V
VIN = 5.5V, EN/SET = VIN, IOUT = 0,
All Switches ON
4.5
µA
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
Under-Voltage Lockout
Under-Voltage Lockout Hysteresis
VUVLO(hys)
250
2.5
mV
VIN = 1.8V, TA = 25°C
3.8
2.2
1.8
1.7
V
IN = 3.0V, TA = 25°C
1.5
RDS(ON)
On-Resistance
Ω
VIN = 4.2V, TA = 25°C
VIN = 5.0V, TA = 25°C
1.2
1.1
TCRDS
On-Resistance Temperature
Coefficient
2800
ppm°C
AAT4290-1 and AAT4291-1
TD(ON)
TR
Output Turn-On Delay
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)
AAT4290-2 and AAT4291-2
TD(ON)
TR
Output Turn-On Delay
VIN = 5V, RLOAD = 500Ω, COUT = 0.1µF
VIN = 5V, RLOAD = 500Ω, COUT = 0.1µF
VIN = 5V, RLOAD = 500Ω
50
200
40
µs
µs
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
Note 1: The AAT4290 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
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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
VIN=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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AAT4290/4291
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)
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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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AAT4290/4291
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
4290.2005.01.1.0
AAT4290/4291
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
decoded into the eight possible states of the MOS-
FET (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.
Table 1: AAT4290 Output Settings.
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
Table 2: AAT4291 Output Settings.
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
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.
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AAT4290/4291
I/O Expander Load Switches with Serial Control
Timing Diagram
OUTn
TR
TD(ON)
TO
TD(OFF)
THI
TLO
TLAT
EN/SET
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
AAT4290/1 internal control is reset. For example, to
10
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AAT4290/4291
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
SC70JW8: 2x2mm
AAT4291IJS
SC70JW8: 2x2mm
VIN
IN
VOUT
C+
OUT1
OUT2
OUT3
VBATTERY
10µF
10µF
R/G/B LED
R
G
B
1µF
ON/OFF
SHDN
C-
EN/SET
GND
GND
RR
RG
RB
CLOCK
Figure 2: RGB LED Control
(eliminates three discrete MOSFET switches).
4290.2005.01.1.0
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AAT4290/4291
I/O Expander Load Switches with Serial Control
Ordering Information
Package
SC70JW-8
SC70JW-8
Marking1
HSXYY
Part Number (Tape and Reel)
AAT4290IJS-1-T1
HCXYY
AAT4291IJS-1-T1
Note: Sample stock is generally held on part numbers listed in BOLD.
Note 1: XYY = assembly and date code.
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
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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, and advise customers 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 control 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.
Advanced Analogic Technologies, Inc.
830 E. Arques Avenue, Sunnyvale, CA 94085
Phone (408) 737-4600
Fax (408) 737-4611
12
4290.2005.01.1.0
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