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I/O Expander Load Switches with Serial Control General Description
The AAT4290 and AAT4291 SmartSwitchTM products are members of AATI's Application Specific Power MOSFETTM (ASPMTM) product family with five and three P-channel MOSFETs, respectively, configured 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 powered by Li-Ion batteries. Each switch features a 500ns turn on time. The switch states are controlled by a S2Cwire interface which permits ease of control and efficiency of size. The quiescent supply current is very low, typically 5A. In shutdown mode, the supply current is reduced to less than 1A. The AAT4290 and AAT4291 are offered in an 8 pin SC70JW package specified over -40 to 85C.
AAT4290/4291
SmartSwitchTM
Features
* * * * * * * *
1.8V to 5.5V input voltage range 5 or 3 Independent Load Switches Optional 200S Slew Rate Control Simple Serial ControlTM (S2CwireTM) Interface 1.1 RDS(ON) Per Switch Low quiescent current * 5A * 0.1A in shutdown -40C to +85C Temperature range Available in 8-Pin SC70JW package
Preliminary Information
Applications
* * * * * I/O Expansion Multiple low power switching Cell Phones 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
CIN 1F COUT1 0.1F COUT2 0.1F COUT3 0.1F COUT4 0.1F COUT5 0.1F
GND
GND
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I/O Expander Load Switches with Serial Control Pin Descriptions
Pin #
AAT4290 AAT4291
AAT4290/4291
Symbol
IN OUT2 OUT1 EN/SET
Function
Input power supply is connected to the P-channel MOSFETs sources. Connect a 1F capacitor from IN to GND. P-channel MOSFET drain P-channel MOSFET drain 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 output settings. Ground Connection P-channel MOSFET drain P-channel MOSFET drain P-channel MOSFET drain
1 2 3 4
1 7 6 4
5 6 7 8
5 N/A N/A 8
GND OUT5 OUT4 OUT3
Pin Configuration
AAT4290 (SC70JW-8) IN OUT2 OUT1 EN/SET
1 2 3 4 8 7 6 5
AAT4291 (SC70JW-8) OUT3 OUT4 OUT5 GND IN N/C N/C EN/SET
1 2 3 4 8 7 6 5
OUT3 OUT2 OUT1 GND
2
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I/O Expander Load Switches with Serial Control Absolute Maximum Ratings
Symbol
VIN VOUT VEN/SET IMAX TSTORAGE VESD
1
AAT4290/4291
Description
IN to GND OUT to GND EN/SET to GND Maximum Continuous Switch Current Storage Temperature Range ESD Rating - HBM 2
Value
-0.3 to 6.0 -0.3 to VIN+0.3 -0.3 to 6.0 250 -65 to 150 4000
Units
V V V mA C V
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 100 pF capacitor discharged through a 1.5 K resistor to each pin.
Thermal Characteristics
Symbol
JA PD
Description
Thermal Resistance Maximum Power Dissipation (TA = 25C)
3 4
Value
225 440
Units
C/W mW
Note 3: Mounted on the board. Note 4: Derate 4.4mW/C above 25C.
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I/O Expander Load Switches with Serial Control Electrical Characteristics
Symbol
VIN IQ IQ(OFF) ISD(OFF) VUVLO VUVLO(hys) RDS(ON) TCRDS AAT4290-1 TD(ON) TR TD(OFF) AAT4290-2 TD(ON) TR TD(OFF) EN/SET VEN(L) VEN(H) TLO THI TO TLAT ISINK
AAT4290/4291
VIN=5.0V, TA = -40 to 85C unless otherwise noted. Typical values are at TA = 25C. Description
Operation Voltage Quiescent Current Off Supply Current Off Switch Current Under voltage Lockout Under voltage Lockout hysteresis On-Resistance
Conditions
VIN=5.5V, EN/SET=VIN, IOUT=0, All Switches ON EN/SET=0, VIN=5.5V, VOUT Open EN/SET=0, VIN=5.5V, VOUTn=0 VIN falling VIN=1.8V, TA VIN=3.0V, TA VIN=4.2V, TA VIN=5.0V, TA = = = = 25C 25C 25C 25C
Min
1.8
Typ
4.5
Max
5.5 8 1 1
Units
V A A A V mV ppmC ns ns ns s s ns
On-Resistance Temp-Co & AAT4291-1 Output Turn-On Delay Turn-On Rise Time Turn-Off Delay Time & AAT4291-2 Output Turn-On Delay Turn-On Rise Time Turn-Off Delay Time Enable Threshold Low Enable Threshold High EN/SET low time Minimum EN/SET high time EN/SET Off Timeout EN/SET Latch Timeout EN/SET input leakage
0.1 1.2 250 2.5 1.5 1.2 1.1 2800 40 270 40 50 200 40
3.8 2.2 1.8 1.7
VIN=5V, RLOAD=500, COUT=0.1F VIN=5V, RLOAD=500, COUT=0.1F VIN=5V, RLOAD=500 VIN=5V, RLOAD=500, COUT=0.1F VIN=5V, RLOAD=500, COUT=0.1F VIN=5V, RLOAD=500 VIN=1.8V VIN=5.5V VEN/SET < 0.4V VIN 2.5V VIN > 2.5V
0.4 1.6 100 500 250 4.0 4.0 1
V V ns ns s s A
VEN/SET = 5.5V
2.6 2.6 0.01
Note 1: The AAT4290 is guaranteed to meet performance specification over the -40C to 85C operating temperature range and are assured by design, characterization and correlation with statistical process controls.
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I/O Expander Load Switches with Serial Control Typical Characteristics
(Unless otherwise noted, VIN = 5V, CIN = 1F, COUTX = 0.1F, TA = 25C) Quiescent Current vs. Temperature
6 5.5 5 4.5 5.5 5
AAT4290/4291
Quiescent Current vs. Input Voltage
VIN=5.0V IQ (A) VIN=3.3V
-40 -20 0 20 40 60 80 100
4.5 4 3.5 3 2.5 2 1.5 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
IQ (A)
4 3.5 3 2.5 2
Temperature (C)
VIN (V)
VIH and VIL vs. Input Voltage
1.4 1.3 1.2
2.7 2.5
RDS(ON) vs. Input Voltage
IO1-5 = 100mA
VIH RDS(ON) ()
2.3 2.1 1.9 1.7 1.5 1.3 1.1 0.9 0.7
VIH and VIL (V)
1.1 1 0.9 0.8 0.7 0.6 0.5
RDS5 RDS1 RDS2
VIL
RDS3
RDS4
3.0 3.5 4.0 4.5 5.0 5.5
1.5 1.5 2 2.5 3 3.5 4 4.5 5 5.5
2.0
2.5
VIN (V)
ViN (V)
RDS(ON) vs. Temperature
1.3 1.2 1.1
RDS(ON) vs. Temperature
1.4 1.3
VIN = 5.0V IO1-5 = 50mA RDS2 RDS(ON) () RDS1 RDS5 RDS4 RDS3
-40 -20 0 20 40 60 80 100
VIN = 5.0V IO1-5 = 100mA RDS1 RDS5
1.2 1.1 1.0 0.9 0.8 0.7 -40
RDS2
RDS(ON) ()
1 0.9 0.8 0.7
RDS4 RDS3
-20 0 20 40 60 80 100
Temperature (C) 4290.2004.07.0.93
Temperature (C)
5
I/O Expander Load Switches with Serial Control Typical Characteristics
(Unless otherwise noted, VIN = 5V, CIN = 1F, COUTX = 0.1F, TA = 25C) EN/SET Latch Timeout vs. Temperature
3.4 3.4 3.2 3 2.8 2.6 2.4 2.2 -20 0 20 40 60 80 100 -40 -20 0 20 40 60 80 100
AAT4290/4291
EN/SET Off Timeout vs. Temperature
Latch timeout, tLAT (s)
3 2.8
Off timeout, tO (s)
3.2
VIN = 3.3V
VIN = 3.3V
2.6
VIN = 5.0V
2.4 2.2 -40
VIN = 5.0V
Temperature (C)
Temperature (C)
EN/SET Timeout vs. Input Voltage
4.3 4.1 3.9
Turn-On Characteristic VIN=5V, RL1=RL2=50, CO1=CO2=0.1F
Timeout (s)
3.7 3.5 3.3 3.1 2.9 2.7 2.5 1.5
VO2 (5V/div) VO1 (5V/div) EN/SET (5V/div)
3 3.5 4 4.5 5 5.5
Off timeout tO
Latch timeout tLAT
2 2.5
VIN (V)
Time (2s/div)
Turn-On Characteristic VIN=5V, RL1=RL2=50, CO1=CO2=0.1F
Turn-On Characteristic VIN=5V, RL1=RL2=50, CO1=CO2=0.1F
VO2 (5V/div) VO1 (5V/div) EN/SET (5V/div)
VO2 (5V/div) VO1 (5V/div) EN/SET (5V/div)
Time (2s/div)
Time (2s/div)
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I/O Expander Load Switches with Serial Control Typical Characteristics
(Unless otherwise noted, VIN = 5V, CIN = 1F, COUTX = 0.1F, TA = 25C) Turn-On Characteristic VIN=5V, RL1=RL2=50, CO1=CO2=0.1F Turn-Off Characteristic VIN=5V, RL1=RL2=50, CO1=CO2=0.1F
AAT4290/4291
VO2 (5V/div) VO1 (5V/div) EN/SET (5V/div)
VO2 (5V/div) VO1 (5V/div) EN/SET (5V/div)
Time (2s/div)
Time (2s/div)
Transition of Outputs VIN=5V, RL1=RL2=50, CO1=CO2=0.1F
Turn-On Transient Characteristic VIN=5V, RL1=RL2=50
VO2 (5V/div) VO1 (5V/div) EN/SET (5V/div)
VO2 (100mV/div, AC couple) VO1 (5V/div) EN/SET (5V/div)
Time (2s/div)
Time (5s/div)
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I/O Expander Load Switches with Serial Control Functional Block Diagram
AAT4290/4291
IN
OUT1 OUT2 OUT3 OUT4* OUT5*
UVLO
Control Logic and Level Shift ROM
EN/SET
S2Cwire Interface
GND
*AAT4290 only
Functional Description
The AAT4290 consists of 5 P-channel MOSFET power switches designed for I/O expansion applications. The AAT4291 has all of the features offered in the AAT4290, but integrates 3 switches instead of 5. It operates with input voltages ranging from 1.8V to 5.5V which, along with its extremely low operating current, makes it ideal for batterypowered 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 inrush current when a MOSFET is turned on, allowing the AAT4290 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 8
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 5 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 below). The counter rolls over after 32 clocks and the table repeats. The counter can be clocked at speeds up to 1 MHz, but the count value is not latched until clocking has stopped and the EN/SET pin has remained high for approximately 2.6s. The first rising edge of EN/SET enables the AAT4290 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
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I/O Expander Load Switches with Serial Control
effect after the EN/SET pin has remained in a high state for TLAT. The AAT4290 is disabled after the EN/SET pin has transitioned and remained in a logic low state for TO. With the exception of 3 channel power switches, the AAT4291 has a similar function to 4290. The ON/OFF state of the 3 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 8 possible states of the MOSFET (see table 2). The counter rolls over after 8 clocks and the table repeats.
AAT4290/4291
Table 1: AAT4290 Output Settings
Clock OUT5 OUT4
1 2 3 4 5 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 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
OUT3
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
OUT2 OUT1
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
Table 2: AAT4291 Output Settings
Clock
1 2 3 4 5 6 7 8
OUT3
on on on on off off off off
OUT2
on on off off on on off off
OUT1
on off on off on off on off
Applications Information
Thermal Considerations
The AAT4290 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 25C ambient, the AAT4290 is capable of dissipating 440mW of power, or 1.14A at 5.0V, for an average current of 228mA per output. At 85C ambient, the AAT4290 is capable of dissipating 178mW of power, or 0.72A at 5.0V, for an average current of 145mA per output.
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I/O Expander Load Switches with Serial Control
Timing Diagram
OUTn
THI TLO TLAT TD(ON) TR TO TD(OFF)
AAT4290/4291
EN/SET
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 AAT4290/1 internal control is reset. For example, to
sequence the outputs in order from OUT5 to OUT1, five clocks bursts are input on the EN/SET pin. From the above table, 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.
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I/O Expander Load Switches with Serial Control Applications Circuits
VSUPPLY 1.8 to 5.5V AAT4290
IN OUT1 OUT2 OUT3 OUT4 OUT5
AAT4290/4291
GPIO 1
EN/SET
EN 1
Function 1
System Controller
GPIO 2 GPIO 3 GPIO 4 GPIO 5
EN 2
Function 2
GPIO 2 to GPIO 5 are now free for other uses
EN 3
Function 3
EN 4
Function 4
EN 5
Function 5
Figure 1: GPIO I/O Expander Condense 5 GPIO Control Lines to 1
AAT3110IJS-5.0 SC70JW8: 2x2mm VIN VOUT
AAT4291IJS SC70JW8: 2x2mm IN
OUT1 OUT2 OUT3 R/G/B LED R G B
VBATTERY
10F
C+
10F
1F ON/OFF SHDN GND CLOCK CEN/SET GND RR
RG
RB
Figure 2:RGB LED Control Eliminates 3 Discrete MOSFET Switches
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I/O Expander Load Switches with Serial Control Ordering Information
Package SC70JW-8 SC70JW-8 Marking1 HSXYY HCXYY Part Number (Tape and Reel) AAT4290IJS-1-T1 AAT4291IJS-1-T1
AAT4290/4291
Note 1: XYY = assembly and date code.
Package Information
SC70JW-8
0.50 BSC 0.50 BSC 0.50 BSC
1.75 0.10 0.225 0.075 2.00 0.20
2.20 0.20
0.048REF 0.15 0.05
0.85 0.15
1.10 MAX
0.100
7 3
0.45 0.10 2.10 0.30
4 4
All dimensions in millimeters.
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, 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
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