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Datasheet
AS1331
300mA Buck-Boost Synchronous DC/DC Converters
1 General Description
This special device is a synchronous buck-boost DC/DC converter which can handle input voltages above, below, or equal to the output voltage. Due to the internal structure of the AS1331 which is working continuously through all operation modes this device is ideal for dual or triple cell alkaline/NiCad/NiMH as well as single cell Li-Ion battery applications. Because of the implemented Power Save Mode, the solution footprint and the component count is minimized and also over a wide range of load currents a high conversion efficiency is provided. The device includes two N-channel MOSFET switches and two P-channel switches. Also following features are implemented: a quiescent current of typically 22A (ideal for battery power applications), a shutdown current less than 1A, current limiting, thermal shutdown and output disconnect. The AS1331 is available in a 10-pin 3x3mm TDFN package with fixed and adjustable output voltage.
2 Key Features
! !
Input Voltage Range: 1.8V to 5.5V Output Voltages: - Fixed: 2.5V, 3.0V, 3.3V - Adjustable: 2.5V to 3.3V Output Current: 300mA @ 3.3V Up to 90% efficiency Power Good Output Disconnection in Shutdown Automatic transition between Buck and Boost mode Ultra Low Quiescent Current: 22A, Shutdown Current <1A (Active Low) Short-Circuit Protection Low Battery detection Over Temperature Protection 10-pin 3x3mm TDFN package
! ! ! ! ! !
! ! ! !
3 Applications
The AS1331 is an ideal solution for handheld computers, handheld instruments, portable music players and PDA's. Two and three cell Alkaline, NiCd or NiMH or single cell Li battery powered products.
Figure 1. AS1331 - Typical Application Diagram
L1 6.8H
4 SW1 1.8 to 5.5V C1 10F
5
2 SW2
8
Low Battery Detect R3 C2 22F VOUT 2.5V to 3.3V
VIN
7
LBO
LBI On Off
6
AS1331-AD
1
VOUT
10
R1
EN 3 PGND 9 GND
FB R2
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AS1331
Datasheet - P i n A s s i g n m e n t s
4 Pin Assignments
Figure 2. Pin Assignments (Top View)
VOUT 1 SW2 2 PGND 3 SW1 4 VIN 5 11
10 FB 9 GND
AS1331
8 LBO 7 LBI 6 EN
Pin Descriptions
Table 1. Pin Descriptions Pin Name VOUT SW1 PGND SW2 VIN EN LBI LBO GND Pin Number 1 2 3 4 5 6 7 8 9 Description Output of the Buck/Boost Converter. Buck/Boost Switch Pin. Connect the inductor from SW1 to SW2 Power Ground. Both GND pins must be connected. Buck/Boost Switch Pin. Connect the inductor from SW1 to SW2. An optional Schottky diode can be connected between this pin and VOUT to increase efficiency. Input Supply Pin. A minimum 2.2F capacitor should be placed between VIN and GND. Enable Pin. Logic controlled shutdown input. 1 = Normal operation; 0 = Shutdown; quiescent current <1A. Low Battery Comperator Input. 1.25V Threshold. May not be left floating. If connected to GND LBO is working as Output Power okay. Low Battery Comperator Output. This open-drain output is low when the voltage on LBI is less than 1.25V. Ground. Both GND pins must be connected. Feedback Pin. Feedback input for the adjustable version. Connect a resistor divider tap to this pin. The output voltage can be adjusted from 2.5V to 3.3V by: VOUT = 1.25V[1 + (R1/R2)] Note: For the fixed Output Voltage Version contact this pin to VOUT. Exposed Pad. This pad is not connected internally. It can be used for ground connection between GND and PGND.
FB
10
NC
11
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AS1331
Datasheet - A b s o l u t e M a x i m u m R a t i n g s
5 Absolute Maximum Ratings
Stresses beyond those listed in Table 2 may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in Electrical Characteristics on page 4 is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Table 2. Absolute Maximum Ratings Parameter SW1, SW2, VIN, VOUT, EN PGND to GND SW1, SW2 ESD Thermal Resistance JA Junction Temperature Operating Temperature Range Storage Temperature Range -40 -65 Min -0.3 -0.3 -0.3 4 +33 +150 85 +125 Max +7 +0.3 +7 Units V V V kV C/W C C C The reflow peak soldering temperature (body temperature) specified is in accordance with IPC/JEDEC J-STD020D "Moisture/Reflow Sensitivity Classification for Non-Hermetic Solid State Surface Mount Devices". The lead finish for Pb-free leaded packages is matte tin (100% Sn). HBM MIL-Std. 883E 3015.7 methods Notes
Package Body Temperature
+260
C
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AS1331
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
6 Electrical Characteristics
VIN = 3.6V, VOUT = 3.3V, TAMB = -40C to +85C. Typical values are at TAMB = +25C. Unless otherwise specified. Table 3. Electrical Characteristics Symbol Input VIN Input Voltage Range Minimum Startup Voltage Undervoltage Lockout VUV Threshold
1
Parameter
Conditions
Min
Typ
Max
Units
1.8 ILOAD < 1mA VIN decreasing 1.5 1.6 1.6
5.5 1.8 1.7
V V V
Regulation Output Voltage Adjustable Version VOUT Output Voltage 3.3V Output Voltage 3.0V Output Voltage 2.5V VFB IFB FB Voltage Adjustable version FB Input Current Adjustable Version VOUT Lockout Threshold Operating Current Quiescent Current VIN IQ ISHDN Switches IMOS MOS Switch Leakage NMOS B, C RON PMOS A PMOS D IPEAK Enable VENH VENL IEN EN Input High EN Input Low EN Input Current EN = 5.5V, TAMB = 25C 1 1.4 0.4 100 V V nA Peak Current Limit VIN = 5V, TAMB=25C, Switches A-D VIN = 5V VIN = 5V VOUT = 3.3V L = 6.8H, VIN = 5V 450 0.01 0.13 0.17 0.21 600 750 1 A mA Quiescent Current VOUT Shutdown Current VIN = 5V VIN = 5V, VOUT = 3.6V, VFB = 1.3V EN = 0V, VOUT = 0V, TAMB = +25C 2 20 0.01 6 32 1 A A A
2
2.50 3.201 No Load 2.910 2.425 No Load VFB = 1.3V, TAMB = 25C Rising Edge 2.0 1.212 3.3 3.0 2.5 1.25 1 2.15
3.30 3.399 3.090 2.575 1.288 100 2.3
V V V V V nA V
Low Battery & Power-OK LBI Threshold LBI Hysteresis LBI Leakage Current LBO Voltage Low
3
Falling Edge
1.212
1.25 10
1.288
V mV
LBI = 5.5V, TAMB = 25C ILBO = 1mA LBO = 5.5V, TAMB = 25C LBI = 0V, Falling Edge 90
1 0.05 1 92.5
100 0.2 100 95
nA V nA %
LBO Leakage Current Power-OK Threshold
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AS1331
Datasheet - E l e c t r i c a l C h a r a c t e r i s t i c s
Table 3. Electrical Characteristics Symbol Thermal Protection Thermal Shutdown 10C Hysteresis 145 C Parameter Conditions Min Typ Max Units
1. If the input voltage falls below this value during normal operation the device goes in startup mode. 2. The regulator is in startup mode until this voltage is reached. Caution: Do not apply full load current until the device output > 2.3V 3. LBO goes low in startup mode as well as during normal operation if: 1) The voltage at the LBI pin is below LBI threshold. 2) The voltage at the LBI pin is below 0.1V and VOUT is below 92.5% of its nominal value.
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AS1331
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
7 Typical Operating Characteristics
Circuit of Figure 24 on page 12, VIN = 2.4V, VOUT = 3.3V, TAMB = +25C, unless otherwise specified. Figure 3. Efficiency vs. Output Current; VOUT = 2.5V
100 90 80 70 60 50
Vi n = 1.8V
Figure 4. Efficiency vs. Output Current; VOUT = 3.0V
100 90 80 70 60 50
Vi n = 1.8V
Efficiency (%)
40 30 0.1 1 10 100
Efficiency (%)
Vi n = 3.6V Vi n = 5.5V
40 30 1000 0.1 1 10 100
Vi n = 3.6V Vi n = 5.5V
1000
Output Current (mA) Figure 5. Efficiency vs. Output Current; VOUT = 3.3V
100 90 80 70 60 50
Vi n = 1.8V
Output Current (mA) Figure 6. Efficiency vs. Input Voltage
100 90 80 70 60 50
Iout = 10mA Vi n = 3.6V Vi n = 5.5V
Efficiency (%)
40 30 0.1 1 10 100
Efficiency (%)
40 30 1000
Iout = 100mA Iout = 300mA
1.8 2.2 2.6 3.0 3.4 3.8 4.2 4.6 5.0 5.4
Output Current (mA) Figure 7. IOUT max vs. Input Voltage
500
Input Voltage (V) Figure 8. Sleep Currents vs. Input Voltage
30 25
Output Current max (mA)
400
Sleep Current (A)
IVOUT
20 15 10 5
IVIN
300
200
100
0 1.8 2.2 2.6 3.0 3.4 3.8 4.2 4.6 5.0 5.4
0 1.8 2.2 2.6 3.0 3.4 3.8 4.2 4.6 5.0 5.4
Input Voltage (V) www.austriamicrosystems.com Revision 1.03
Input Voltage (V) 6 - 16
AS1331
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
Figure 9. IIN Short Circuit vs. Input Voltage
30
Figure 10. VOUT Ripple vs. Input Voltage
250
Vout Ripple Voltage (mV)
25
200
Input Current (mA)
20 15 10 5 0 1.8 2.2 2.6 3.0 3.4 3.8 4.2 4.6 5.0 5.4
150
100
50
10uF / Vpp 22uF / Vpp 47uF / Vpp
0 1.5 2 2.5 3 3.5 4 4.5 5 5.5
Input Voltage (V)
Input Voltage (V)
Figure 11. Load Regulation vs. Load Current
3.38 3.36
Figure 12. VOUT Regulation vs. Temperature
3.5
VOUT = 3.3V
3.25
Output Voltage (V)
Output Voltage (V)
3.34 3.32 3.3 3.28 3.26 3.24 0.1 1 10 100 1000
Vout - 10uF Vout - 22uF Vout - 47uF
VOUT = 3.0V
3 2.75 2.5 2.25 2 -45 -30 -15
VOUT = 2.5V
0
15
30
45
60
75
90
Load Current (mA)
Temperature (C)
Figure 13. IFB vs. Temperature; VIN = 5V
0.4
3.6V 5.0V
Figure 14. EN Pin Threshold
1
Threshold Voltage (V)
0.3
5.5V
FB Input Current (A)
0.9
0.2 0.1 0 -0.1 -0.2 -45 -30 -15
0.8
0.7
up-ON down-OFF
0
15
30
45
60
75
90
0.6 -45 -30 -15
0
15
30
45
60
75
90
Temperature (C)
Temperature (C)
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AS1331
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
Figure 15. VIN = 4.4V, VOUT = 3.3V, IOUT = 200mA
200mV/Div 5V/Div 5V/Div
Figure 16. VIN = 4.4V, VOUT = 3.3V, IOUT = 50mA
200mV/Div 5V/Div 5V/Div 5s/Div 5s/Div 5s/Div 200mA/Div 200mV/Div 5V/Div 5V/Div 200mA/Div 200mV/Div 5V/Div 5V/Div 200mA/Div
SW2 SW1
VOUT
200mA/Div
ICOIL
5s/Div
Figure 17. VIN = 3.6V, VOUT = 3.3V, IOUT = 200mA
200mV/Div 5V/Div 5V/Div
Figure 18. VIN = 3.6V, VOUT = 3.3V, IOUT = 50mA
SW2 SW1
VOUT
200mA/Div
ICOIL
5s/Div
Figure 19. VIN = 2.5V, VOUT = 3.3V, IOUT = 200mA
200mV/Div 5V/Div 5V/Div
Figure 20. VIN = 2.5V, VOUT = 3.3V, IOUT = 50mA
SW2 SW1
VOUT
200mA/Div
ICOIL
5s/Div
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ICOIL
VOUT
SW2 SW1
ICOIL
VOUT
SW2 SW1
ICOIL
VOUT
SW2 SW1
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AS1331
Datasheet - Ty p i c a l O p e r a t i n g C h a r a c t e r i s t i c s
Figure 21. Shorted Output; VIN = 3.6V
5V/Div 5V/Div
Figure 22. Startup; VIN = 3.6V, Rload = 3.3k
5V/Div 500s/Div 200mA/Div 2V/Div 5V/Div
VOUT SW2 SW1
200mV/Div
200mA/Div
ICOIL
1s/Div
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ICOIL
VOUT
SW2 SW1
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AS1331
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The synchronous buck-boost converter AS1331 uses a Power Save Mode control technique to reach a high efficiency over a wide dynamic range of load currents. The output voltage is monitored by a comparator with 3% accuracy. The Power Save Mode puts the device into "sleep mode" when VOUT is above its programmed reference threshold. Meaning, the switching is stopped and only quiescent current is drawn from the power source. The switching is started again when VOUT drops below the reference threshold and the output capacitor is charged again. The numbers of current pulses which are necessary to load the output capacitor are set by the value of the output capacitor, the load current, and the comparator hysteresis (~1%).
Figure 23. AS1331 - Block Diagram - Fixed Output Voltage
SW1 SW A Gate Drivers and Anticross Conduction SW2 SW D
VIN
VOUT
SW B
IZERO Detect
AS1331
Peak Current 600mA Limit
SW C
VBEST VIN State Machine and Logic VBEST VOUT FB
VOUT Comp 1.25V
VIN
UVLO
1.6V EN
Shutdown Thermal Shutdown
R2
R1
PGND
GND
Modes of Operation
When VOUT drops below the reference threshold, the AS1331 switches on the transistors SW A and SW C until the inductor current reaches approximately 400mA. In the next step SW A and SW D are closed and depending on the difference between VIN and VOUT the inductor current raises, falls or stays constant. VIN > VOUT: The inductor current is going up to 600mA. VIN ~ VOUT: The device stops after 2s. VIN < VOUT: The inductor current falls down to 0mA. If the inductor current is not 0mA, the transistors SW B and SW D are closed to ramp down the current to zero. If VOUT is still below the threshold voltage the next cycle is started. If IMAX (600mA) wasn't reached in the previous cycle, SW A and SW D are closed until the inductor current is 600mA.
Note: The 4-switch-mode (SW A+SW C => SW B+SW D => SW A + SW C...) and also the buck-mode (SW A+SW D => SW B+SW D => SW A+SW D...) are never used.
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AS1331
Datasheet - D e t a i l e d D e s c r i p t i o n
Start-Up Mode
At start-up the switch SW D is disabled and its diode is used to transfer current to the output capacitor until VOUT reaches approximately 2.15V. The inductor current is controlled by an alternate algorithm during start-up.
Note: Do not apply loads >1mA until VOUT = 2.3V is reached.
Other AS1331 Features
Shutdown
The part is in shutdown mode while the voltage at pin EN is below 0.4V and is active when the voltage is higher than 1.4V.
Note: EN can be driven above VIN or VOUT, as long as it is limited to less than 5.5V. Output Disconnect and Inrush Limiting
During shutdown VOUT is going to 0V so that no current from the input source is running thru the device. The inrush current is also limited at turn-on mode to minimize the surge currents seen by the input supply. These features of the AS1331 are realized by opening both P-channel MOSFETs of the rectifiers, allowing a true output disconnect.
Power-OK and Low-Battery-Detect Functionality
LBO goes low in startup mode as well as during normal operation if: 1) The voltage at the LBI pin is below LBI threshold (1.25V). This can be used to monitor the battery voltage. 2) LBI pin is connected to GND and VOUT is below 92.5% of its nominal value. LBO works as a power-OK signal in this case. The LBI pin can be connected to a resistive-divider to monitor a particular definable voltage and compare it with a 1.25V internal reference. If LBI is connected to GND an internal resistive-divider is activated and connected to the output. Therefore, the Power-OK functionality can be realised with no additional external components. The Power-OK feature is not active during shutdown and provides a power-on-reset function that can operate down to VIN = 1.8V. A capacitor to GND may be added to generate a power-on-reset delay. To obtain a logic-level output, connect a pull-up resistor from pin LBO to pin VOUT. Larger values for this resistor will help to minimize current consumption; a 100k resistor is perfect for most applications (see Figure 25 on page 12). For the circuit shown in the left of Figure 24 on page 12, the input bias current into LBI is very low, permitting largevalue resistor-divider networks while maintaining accuracy. Place the resistor-divider network as close to the device as possible. Use a defined resistor for R2 and then calculate R1 as: VIN (EQ 1) R1 = R2 ------------------- - 1 VSENSE
Where:
VSENSE (the internal sense reference voltage) is 1.25V. R2 (the predefined resistor in the resistor devider) has to be 270k. In case of the LBI pin is connected to GND, an internal resistor-devider network is activated and compares the output voltage with a 92.5% voltage threshold. For this particular Power-OK application, no external resistive components are necessary.
Thermal Shutdown
To prevent the AS1331 from short-term misuse and overload conditions the chip includes a thermal overload protection. To block the normal operation mode all switches will be turned off. The device is in thermal shutdown when the junction temperature exceeds 145C. To resume the normal operation the temperature has to drop below 135C. A good thermal path has to be provided to dissipate the heat generated within the package. Otherwise it's not possible to operate the AS1331 at its useable maximal power. To dissipate as much heat as possible away from the package into a copper plane with as much area as possible, it's recommended to use multiple vias in the printed circuit board. It's also recommended to solder the Exposed Pad (pin 11) to the GND plane.
Note: Continuing operation in thermal overload conditions may damage the device and is considered bad practice.
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AS1331
Datasheet - D e t a i l e d D e s c r i p t i o n
Output Voltage Selection
The AS1331 is available in two versions (see Ordering Information on page 15). One version can only operate at one fixed output voltage (see Figure 25) and the other version can operate with user-adjustable output voltages from 2.5V to 3.3V by connecting a voltage divider between the pins VOUT and FB (see Figure 24).
Figure 24. LiIon to Adjustable Output Voltage
L1 6.8H
4 SW1 LiIon C1 10F
5
2
SW2
8
VIN
7
LBO
R3 VOUT 2.5V to 3.3V R1 C2 22F
LBI On Off
6
AS1331-AD
1
VOUT
10
EN 3 PGND 9 GND
FB R2
The output voltage can be adjusted by selecting different values for R1 and R2. Calculate VOUT by:
R1 V OUT = V FB x 1 + ----- R 2 Where: (EQ 2)
VFB = 1.25V, VOUT = 2.5V to 3.3V;
Figure 25. LiIon to 3.3V with POK - Fixed Output Voltage
L1 6.8H
4 SW1 LiIon C1 10F
5
2 SW2
8
VIN
7
LBO
R3 C2 22F
LBI On Off
6
AS13313.3V
1
VOUT
10
VOUT 3.3V 300mA
EN 3 PGND 9 GND
FB
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AS1331
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
9 Application Information
Component Selection
Only three power components are required to complete the design of the buck-boost converter. For the adjustable version VOUT programming resistors are needed. The high operating frequency and low peak currents of the AS1331 allow the use of low value, low profile inductors and tiny external ceramic capacitors.
Inductor Selection
For best efficiency, choose an inductor with high frequency core material, such as ferrite, to reduce core losses. The inductor should have low DCR (DC resistance) to reduce the IR losses, and must be able to handle the peak inductor current without saturating. A 6.8H inductor with a >600mA current rating and <400m DCR is recommended.
Table 4. Recommended Inductors Part Number L DCR Current Rating Dimensions (L/W/T) Manufacturer Coilcraft www.coilcraft.com
LPS3015-682M EPL2014-682M XPL2010-682M
6.8H 6.8H 6.8H
300m 287m 336m
0.89A 0.80A 0.73A
3.0x3.0x1.5mm 2.0x2.0x1.4mm 2.0x1.9x1.0mm
Capacitor Selection
The buck-boost convertor requires two capacitors. Ceramic X5R or X7R types will minimize ESL and ESR while maintaining capacitance at rated voltage over temperature. The VIN capacitor should be at least 2.2F. The VOUT capacitor should be between 10F and 47F. A larger output capacitor should be used if lower peak to peak output voltage ripple is desired. A larger output capacitor will also improve load regulation on VOUT. See Table 5 for a list of capacitors for input and output capacitor selection.
Table 5. Recommended Input Capacitor Part Number C TC Code Rated Voltage Dimensions (L/W/T) Manufacturer Murata www.murata.com
GRM188R61A225KE34 GRM188R60J475KE19 GRM219R60J106KE19
2.2F 4.7F 10F
X5R X5R X5R
10V 6.3V 6.3V
0603, T=0.87mm 0603, T=0.87mm 0805, T=0.95mm
Table 6. Recommended Output Capacitor Part Number C TC Code Rated Voltage Dimensions (L/W/T) Manufacturer Murata www.murata.com
GRM21BR61A106KE19 GRM319R61A106KE19 GRM319R61A106KE19 GRM31CR61C226KE15 GRM31CR60J475ME19
10F 10F 10F 22F 47F
X5R X5R X5R X5R X5R
10V 10V 10V 16V 6.3V
0805, T=1.35mm 1206, T=0.95mm 1210, T=0.95mm 1206, T=1.8mm 1206, T=1.75mm
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AS1331
Datasheet - P a c k a g e D r a w i n g s a n d M a r k i n g s
10 Package Drawings and Markings
The device is available in a 10-pin 3x3mm TDFN package.
Figure 26. 10-pin 3x3mm TDFN package Diagram
D D2 SEE DETAIL B B A L E2/2
2x aaa C PIN 1 INDEX AREA (D/2 xE/2)
D2/2
E2 K N N-1 e (ND-1) X e b ddd bbb C CAB
BTM VIEW
PIN 1 INDEX AREA (D/2 xE/2)
aaa C
2x
TOP VIEW
e DETAIL B
Terminal Tip
ccc C
E
A3
C
SEATING PLANE
0.08 C
A
Datum A or B ODD TERMINAL SIDE
Table 7. 10-pin 3x3mm TDFN package Dimensions Symbol Min Typ Max A 0.70 0.75 0.80 A1 0.00 0.02 0.05 A3 0.20 REF L1 0.03 0.15 L2 0.13 aaa 0.15 bbb 0.10 ccc 0.10 ddd 0.05 eee 0.08 ggg 0.10 Note:
Symbol D BSC E BSC D2 E2 L K b e N ND
Min
Typ 3.00 3.00
A1
SIDE VIEW
Max
2.20 1.40 0.30 0.20 0.18
0.40 0.25 0.50 10 5
2.70 1.75 0.50 0.30
0
14
1. 2. 3. 4. 5.
Figure 26 is shown for illustration only. All dimensions are in millimeters, angle is in degrees. Dimensioning and tolerancing conform to ASME Y14.5M-1994. N is the total number of terminals. Terminal #1 identifier and terminal numbering convention shall conform to JESD 95-1 SPP-012. Details of terminal #1 identifier are optional, but must be located within the area indicated. The terminal #1 identifier may be either a mold, embedded metal or mark feature. 6. Dimension b applies to metallized terminal and is measured between 0.15 and 0.30mm from terminal tip. 7. ND refers to the maximum number of terminals on D side. 8. Unilateral coplanarity zone applies to the exposed heat sink slug as well as the terminals.
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AS1331
Datasheet - O r d e r i n g I n f o r m a t i o n
11 Ordering Information
The device is available as the standard products shown in Table 8.
Table 8. Ordering Information Ordering Code Marking Output Description Delivery Form Package
AS1331-BTDT-AD AS1331-BTDT-25* AS1331-BTDT-30* AS1331-BTDT-33
* on request
ASRP ASRR ASRT ASRU
300mA Buck-Boost adjustable Synchronous DC/DC Converters 300mA Buck-Boost 2.5V Synchronous DC/DC Converters 300mA Buck-Boost 3.0V Synchronous DC/DC Converters 300mA Buck-Boost 3.3V Synchronous DC/DC Converters
Tape and Reel 10-pin 3x3mm TDFN Tape and Reel 10-pin 3x3mm TDFN Tape and Reel 10-pin 3x3mm TDFN Tape and Reel 10-pin 3x3mm TDFN
Note: All products are RoHS compliant and Pb-free. Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect
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AS1331
Datasheet
Copyrights
Copyright (c) 1997-2009, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered (R). All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies.
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Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services.
Contact Information
Headquarters austriamicrosystems AG Tobelbaderstrasse 30 A-8141 Unterpremstaetten, Austria Tel: +43 (0) 3136 500 0 Fax: +43 (0) 3136 525 01 For Sales Offices, Distributors and Representatives, please visit: http://www.austriamicrosystems.com/contact
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Price & Availability of AS1331-BTDT-25

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