AMSCO AS1337B-BTDT

Da t as heet
AS1337
2 0 0 m A , D C - D C St e p - U p C o n v e r t e r w i t h B u c k M o d e
1 General Description
2 Key Features
The AS1337 is a synchronous, fixed frequency,
highefficiency DC-DC boost converter capable of
supplying 3.3V @ 200mA from two AA Cells. Compact size and minimum external parts requirements make these devices perfect for modern
portable devices. The AS1337 offers automatic
powersave mode to increase efficiency at light
loads. For input voltages higher than VOUT the
AS1337 will switch in a step down mode, so that a
Buck Boost function is realized.
!
Input Voltage Range: 0.65V to 4.5V
!
Low Start-Up Voltage: 0.85V
!
Output Voltage Range: 2.5V to 5.0V
!
Delivers 200mA @ 3.3V (from two AA Cell)
!
up to 97% Efficiency
!
High-Speed Fixed-Frequency: 1.2MHz
!
Single-Cell Operation
The AS1337A offers a shutdown mode where the
battery is connected directly to the output enabling
the supply of real-time-clocks or memories.
!
Internal PMOS Synchronous Rectifier
!
Automatic Powersave Operation
!
Anti-Ringing Control Minimizes EMI
!
Logic Controlled Shutdown (< 1µA)
!
TDFN (3x3mm) 8-pin Package
The AS1337 offers a POK (open-drain) feature
which detects output power fail of 10%.
The AS1337 is available in a TDFN (3x3mm) 8-pin
package.
3 Applications
The AS1337 is ideal for low-power applications
where ultra-small size is critical as in medical diagnostic equipment, hand-held instruments, pagers,
digital cameras, remote wireless transmitters, MP3
players, LCD bias supplies, cordless phones, GPS
receivers, and PC cards.
Figure 1. AS1337 - Typical Application Diagram – Dual Cell to 3.3V Synchronous Boost Converter
L1
4.7µH
3.6V
Buck Mode
2x AA Cell Range
VOUT=3.3V
VIN Curve
Boost Mode
VOUT = 3.3V
VOUT
LX
VIN = 2xAA
1.6V to 3.6V
VIN
CIN
10µF
On
Off
EN
GND
AS1337
COUT
22µF
FB
POK
PGND
1.6V
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Revision 1.03
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AS1337
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
8 FB
LX 2
7 VIN
AS1337
PGND 3
GND 4
6 POK
9 GND
5 EN
Pin Descriptions
Table 1. Pin Descriptions
Pin Name
Pin Number
VOUT
1
LX
2
PGND
3
GND
4
EN
5
POK
6
VIN
7
FB
8
GND
9
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Description
Output Voltage. Bias is derived from VOUT when VOUT exceeds VIN. PCB trace
length from VOUT to the output filter capacitor(s) should be as short and wide as
is practical.
Switch Pin. Connect an inductor between this pin and VIN. Keep the PCB trace
lengths as short and wide as is practical to reduce EMI and voltage overshoot. If
the inductor current falls to zero, or pin EN is low, an internal 100Ω anti-ringing
switch is connected from this pin to VIN to minimize EMI.
Note: An optional Schottky diode can be connected between this pin and VOUT.
Power Ground. Provide a short, direct PCB path between this pin and the output capacitor(s).
Ground
Enable Pin. Logic controlled enable input.
1 = Normal operation
0 = Shutdown
Note: In a typical application, EN should be connected to VIN through a 1MΩ
pull-up resistor.
POK. High when VOUT is within regulation.
Input Voltage. The AS1337 gets its start-up bias from VIN unless VOUT exceeds
VIN, in which case the bias is derived from VOUT. Thus, once started, operation
is completely independent from VIN. Operation is only limited by the output
power level and the internal series resistance of the supply.
Feedback Pin. Feedback input to the gm error amplifier. Connect a resistor
divider tap to this pin. The output voltage can be adjusted from 2.5V to 5V by:
VOUT = 1.23V[1 + (R1/R2)]
Exposed Pad Ground
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AS1337
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 Section 6 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
Min
Max
Units
VIN to GND
-0.3
5.5
V
FB to GND
-0.3
5
V
All other pins to GND
-0.3
6
V
Operating Temperature Range
-40
+85
ºC
Storage Temperature Range
-65
+125
ºC
Package Body Temperature
Latch-Up
Human Body Model
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-100
Notes
+260
ºC
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).
100
mA
@85°C, JEDEC 78
kV
HBM MIL-Std. 883E 3015.7 methods
2
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AS1337
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 = VEN = +1.2V, VOUT = +3.3V, Typ values @ TAMB = +25ºC, TAMB = -40 to +85ºC (unless otherwise specified);
Table 3. Electrical Characteristics
Symbol
Parameter
Conditions
Min
Typ
Max
Units
0.85
1.15
V
0.65
0.85
V
4.5
V
5
V
1.268
V
Input
Minimum Start-Up Voltage
Minimum Operating Voltage
VIN
ILOAD = 1mA
EN = VIN
1
Maximum Input Voltage
Output Voltage Adjust Range
2.5
Regulation
VFB
Feedback Voltage
IFB
Feedback Input Current
1.192
VFB = 1.25V
1.23
1
nA
Operating Current
2
IQPWS
Quiescent Current
VFB = 1.4V
ISHDN
Shutdown Current
EN = GND, VIN = 3.3V
20
35
µA
0.01
1
µA
0.01
1
µA
Switches
INMOSSWL NMOS Switch Leakage
RONNMOS NMOS Switch On Resistance
RONPMOS PMOS Switch On Resistance
INMOS
0.35
VOUT = 5V
0.20
VOUT = 3.3V
0.45
VOUT = 5V
0.30
NMOS Current Limit
Max Duty Cycle
fSW
VOUT = 3.3V
VFB = 1V
Switching Frequency
Ω
Ω
850
mA
80
87
%
0.95
1.2
1.5
MHz
Shutdown
VIH
1
Enable Input Threshold
IEN
V
0.3
VIL
EN Input Current
EN = 5.0V
0.01
1
µA
POK Voltage Low
IPOK=1mA
0.1
0.4
V
POK Leakage Current
VPOK = VIN or VOUT
1
100
nA
Power-OK Threshold
Falling Edge
88
91
%
Power-OK
86
Thermal Protection
TENM
Overtemperature Protection
145
ºC
ΔTENM
Overtemperature Protection
Hysteresis
10
ºC
1. Minimum VIN operation after start-up is only limited by the battery’s ability to provide the necessary power as it
enters a deeply discharged state.
2. IQPWS is measured at VOUT. Multiply this value by VOUT/VIN to get the equivalent input (battery) current.
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AS1337
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
VOUT = 3.3V, CIN = 10µF, COUT = 22µF, L1 = 4.7µH, TAMB = +25°C (unless otherwise specified).
Figure 4. Efficiency vs. IOUT - Step-up Mode
100
100
90
90
80
80
Efficiency (%)
Efficiency (%)
Figure 3. Efficiency vs. IOUT - Down Conversion Mode
70
60
50
70
60
50
Vin = 1.5V
Vin = 3.5V
40
40
Vin = 4.0V
Vin = 2.0V
Vin = 3.0V
30
30
0.1
1
10
100
1000
0.1
1
Output Current (mA)
10
100
1000
Output Current (mA)
Figure 5. Efficiency vs. Input Voltage
Figure 6. Output Current vs. Input Voltage
500
100
Output Current (mA)
Efficiency (%)
90
80
70
60
Iout = 1mA
50
Iout = 10mA
Iout = 30mA
40
400
300
200
100
Iout = 100mA
Iout = 200mA
30
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
0.5
4.5
1
1.5
Input Voltage (V)
Figure 7. Min. Operating Voltage vs. Temperature
3
3.5
4
4.5
1.5
Switching Frequency (MHz)
Minimum Operating Voltage (V)
2.5
Figure 8. Switching Frequency vs. Temperature
0.85
0.75
0.65
0.55
0.45
0.35
-45 -30 -15
2
Input Voltage (V)
0
15
30
45
60
75
90
1.4
1.3
1.2
1.1
1
0.9
-45 -30 -15
Temperature (°C)
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0
15
30
45
60
75
90
Temperature (°C)
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AS1337
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. Output Voltage vs. Temp.; ILOAD = 1mA
Figure 10. Load Transient Response; VIN = 1.8V
3.5
100mV/Div
VOUT
3.4
3.35
3.25
100mA
3.3
IOUT
3.2
10mA
Output Voltage (V)
3.45
3.15
3.1
-45 -30 -15
0
15
30
45
60
75
90
1ms/Div
Temperature (°C)
100mA
VOUT
10mA
10mA
IOUT
100mA
VOUT
IOUT
100mV/Div
Figure 12. Load Transient Response; VIN = 3.6V
100mV/Div
Figure 11. Load Transient Response; VIN = 3.0V
1ms/Div
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1ms/Div
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AS1337
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The AS1337 can operate from a single-cell input voltage (VIN) below 1V, and features fixed frequency (1.2MHz) and
current mode PWM control for exceptional line- and load-regulation. With low RDS(ON) and gate charge internal NMOS
and PMOS switches, the device maintains high-efficiency from light to heavy loads.
Modern portable devices frequently spend extended time in low-power or standby modes, switching to high powerdrain only when certain functions are enabled. The AS1337 is ideal for portable devices since they maintain highpower conversion efficiency over a wide output power range, thus increasing battery life in these types of devices.
In addition to high-efficiency at moderate and heavy loads, the AS1337 includes an automatic powersave mode that
improves efficiency of the power converter at light loads. The powersave mode is initiated if the output load current
falls below a factory programmed threshold.
The Overtemperature protection circuitry turn-off both switches for a short time when the temperature reaches 145ºC
in the device .
Figure 13. AS1337 - Block Diagram
L1
4.7µH
1 SW
4
POK
1.5V
Single
Cell
6
VIN
CIN
1µF
Start Up
OSC
A
B
PWM
Control
Sync Drive
Control
1.2MHz
Ramp
Generator
Slope
Compensator
Σ
EN
Shutdown
Control
Powersave
Shutdown
Powersave
Operation
Control
RC
80kΩ
CC
150pF
3.3V
Output
5
VOUT
0.45Ω
0.35Ω
CFF*
Current
Sense
+
PWM –
Comp
–
4
2.3V
–
VOUT
Good
+
A/B
MUX
3
–
gm Error
Amp
+
R1
1.02MΩ
1%
COUT
4.7µF
FB
CP2
2.5pF
1.23V
Ref
R2
640kΩ
1%
AS1337
2 GND
* Optional
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AS1337
Datasheet - D e t a i l e d D e s c r i p t i o n
Low-Voltage Start-Up and Soft Start
The AS1337 requires a VIN of only 0.85V (typ) or higher to start up. The low-voltage start-up circuitry controls the internal switches and provides a soft start function, where the inductor current during start up is limited to about 300mA.
This soft start and in rush current limitation feature provides also a smooth curve of VOUT after start up and makes the
overshoot of VOUT minimal.
After a certain time a bigger inductor current is allowed and the soft start is disabled.
Low-Noise Fixed-Frequency Operation
Oscillator
The AS1337 switching frequency is internally fixed at 1.2MHz allowing the use of very small external components.
Current Sensing
A signal representing the internal NMOS-switch current is summed with the slope compensator. The summed signal is
compared to the error amplifier output to provide a peak current control command for the PWM. Peak switch current is
limited to approximately 850mA independent of VIN or VOUT.
Zero Current Comparator
The zero current comparator monitors the inductor current to the output and shuts off the PMOS synchronous rectifier
once this current drops to 20mA (approx.). This prevents the inductor current from reversing polarity and results in
improved converter efficiency at light loads.
Anti-Ringing Control
Anti-ringing control circuitry prevents high-frequency ringing on pin LX as the inductor current approaches zero. This is
accomplished by damping the resonant circuit formed by the inductor and the capacitance on pin LX.
Setting Output Voltage
A voltage divider from VOUT to GND programs the output voltage from 2.5V to 5V via pin FB as:
VOUT = 1.23V(1 + (R1/R2))
(EQ 1)
Powersave Operation
In light load conditions, the integrated powersave feature removes power from all circuitry not required to monitor
VOUT. When VOUT has dropped approximately 1% from nominal, the AS1337 powers up and begins normal PWM
operation.
COUT (see Figure 13 on page 7) recharges, causing the AS1337 to re-enter powersave mode as long as the output
load remains below the powersave threshold. The frequency of this intermittent PWM is proportional to load current;
i.e., as the load current drops further below the powersave threshold, the AS1337 turns on less frequently. When the
load current increases above the powersave threshold, the AS1337 will resume continuous, seamless PWM operation.
Note: An optional capacitor (CFF) between pins VOUT and FB in some applications can reduce VOUTp-p ripple and
input quiescent current during powersave mode. Typical values for CFF range from 15pF to 220pF.
Buck Mode
The AS1337A offers a low power buck mode for VIN > VOUT operation.
Shutdown
When pin EN is low the AS1337 is switched off and <1µA current is drawn from battery; when pin EN is high the device
is switched on. If EN is driven from a logic-level output, the logic high-level (on) should be referenced to VOUT to avoid
intermittently switching the device on.
Note: If pin EN is not used, it should be connected directly to pin VOUT.
Caution: Because of the feedthrough the output voltage is the same as the input voltage during shutdown. If VIN >
VOUT the output voltage will jump to the value of the input voltage when the device switches into shutdown. During normal operation the device is in down conversion mode.
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AS1337
Datasheet - D e t a i l e d D e s c r i p t i o n
Shutdown Battery Feedthrough (AS1337A)
In shutdown the battery input of the AS1337A is connected to the output through the inductor and the small internal
synchronous rectifier P-FET. This allows the input battery to provide backup power for devices such as an idle microcontroller, memory, or real-time-clock, without the usual diode forward drop. In this way a separate backup battery is
not needed.
Future Version (on request): Shutdown Battery Disconnect (AS1337B)
The AS1337B is designed to allow true output disconnect by opening both P-channel MOSFET rectifiers. This means
that VOUT is discharged and connected to GND.
POK Function
The POK output indicates if the output voltage is within 88% (typ.) of the nominal voltage level. As long as the output
voltage is within regulation the open-drain POK output is high impedance. The POK output can be tied to VIN or to
VOUT or to any external voltage up to VIN or VOUT via a pull-up resistance (see Figure 1 on page 1). If the output voltage drops below 88% (typ.) of the nominal voltage the POK pin is pulled to GND.
Note: It is important to consider that in shutdown mode the POK output is pulled to VIN in order to save current.
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AS1337
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
The AS1337 is perfectly suited for LED matrix displays, bar-graph displays, instrument-panel meters, dot matrix displays, set-top boxes, white goods, professional audio equipment, medical equipment, industrial controllers to name a
few applications.
Along with Figure 1 on page 1, Figure 14 and Figure 15 depict a few of the many applications for which the AS1337
converters are perfectly suited.
Figure 14. Single AA Cell to 3.3V Synchronous Boost Converter
L1
4.7µH
VOUT = 3.3V
LX
VOUT
R1
1.02MΩ
FB
R2
640kΩ
VIN = 1.5V
VIN
CIN
10µF
On
Off
AS1337
EN
COUT
22µF
POK
GND
PGND
Figure 15. Single Lithium Cell to 5V
L1
4.7µH
VOUT = 5.0V
VOUT
LX
Lithium-Ionen Cell
VIN
CIN
10µF
On
Off
EN
GND
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FB
AS1337
R1
2MΩ
COUT
22µF
R2
640kΩ
POK
PGND
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AS1337
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Component Selection
Only three power components are required to complete the design of the buck-boost converter, except the additional
two resistors for the voltage divider to set VOUT. The high operating frequency and low peak currents of the AS1337
allow the use of low value, low profile inductors and tiny external ceramic capacitors.
Inductor Selection
The inductor should have low ESR to reduce the I²R power losses, and must be able to handle the peak inductor
current without saturating. High-frequency ferrite core inductor materials reduce frequency dependent power losses
compared to less expensive powdered iron types, which result in improved converter efficiency.
A 4.7µH to 15µH inductor value with a >850mA current rating and low DCR is recommended. For applications where
radiated noise is a concern, a toroidal or shielded inductor can be used.
Capacitor Selection
A 10µF capacitor is recommend for CIN as well as a 22µF for COUT. Small-sized ceramic capacitors are recommended.
X5R and X7R ceramic capacitors are recommend as they retain capacitance over wide ranges of voltages and temperatures.
Output Capacitor Selection
Low ESR capacitors should be used to minimize VOUT ripple. Multi-layer ceramic capacitors are recommended since
they have extremely low ESR and are available in small footprints. A 1 to 10µF output capacitor is sufficient for most
applications. Larger values up to 22µF may be used to obtain extremely low output voltage ripple and improve transient response.
An additional phase lead capacitor may be required with output capacitors larger than 10µF to maintain acceptable
phase margin. X5R and X7R dielectric materials are recommended due to their ability to maintain capacitance over
wide voltage and temperature ranges.
Input Capacitor Selection
Low ESR input capacitors reduce input switching noise and reduce the peak current drawn from the battery. Ceramic
capacitors are recommended for input decoupling and should be located as close to the device as is practical. A 4.7µF
input capacitor is sufficient for most applications. Larger values may be used without limitations.
Table 4. Recommended External Components
Name
Part Number
Value
Rating
Type
Size
CIN
GRM219R60J106KE19
10µF
6.3V
X5R
0805
COUT
GRM21BR60J226ME39
22µF
6.3V
X5R
0805
L1
MOS6020-472ML
4.7µH
1.82A
50mΩ
Manufacturer
Murata
www.murata.com
Coilcraft
6.8x6.0x2.4mm www.coilcraft.com
PCB Layout Guidelines
The high-speed operation of the AS1337 requires proper layout for optimum performance.
!
A large ground pin copper area will help to lower the device temperature.
!
A multi-layer board with a separate ground plane is recommended.
!
Traces carrying large currents should be direct.
!
Trace area at pin FB should be as small as is practical.
!
The lead-length to the battery should be as short as is practical.
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AS1337
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 devices are available in a TDFN (3x3mm) 8-pin package.
Figure 16. TDFN (3x3mm) 8-pin Package
D2
SEE
DETAIL B
A
D
D2/2
B
aaa C 2x
E
E2
E2/2
L
PIN 1 INDEX AREA
(D/2 xE/2)
K
PIN 1 INDEX AREA
(D/2 xE/2)
aaa C
N N-1
2x
b
e
TOP VIEW
(ND-1) X e
e
BTM VIEW
Terminal Tip
ddd
bbb
C
C A B
DETAIL B
e/2
A3
ccc C
A
C
SIDE VIEW
A1
0.08 C
SEATING
PLANE
Datum A or B
EVEN TERMINAL SIDE
Symbol
A
A1
A3
L1
L2
aaa
bbb
ccc
ddd
eee
ggg
Min
0.70
0.00
Typ
0.75
0.02
0.20 REF
0.03
Max
0.80
0.05
0.15
0.13
0.15
0.10
0.10
0.05
0.08
0.10
Notes
1, 2
1, 2
1, 2
1, 2
1, 2
1, 2
1, 2
1, 2
1, 2
1, 2
1, 2
Symbol
D BSC
E BSC
D2
E2
L
θ
K
b
e
N
ND
Min
1.60
1.35
0.30
0º
0.20
0.18
Typ
3.00
3.00
0.40
0.25
0.65
8
4
Max
2.50
1.75
0.50
14º
0.30
Notes
1, 2
1, 2
1, 2
1, 2
1, 2
1, 2
1, 2
1, 2, 5
1, 2
1, 2, 5
Notes:
1. Figure 16 is shown for illustration only.
2. All dimensions are in millimeters; angles in degrees.
3. Dimensioning and tolerancing conform to ASME Y14.5 M-1994.
4. N is the total number of terminals.
5. The terminal #1 identifier and terminal numbering convention shall conform to JEDEC 95-1, SPP-012. Details of terminal #1 identifier are optional, but must be located within the zone indicated. The terminal #1 identifier may be either
a mold or marked feature.
6. Dimension b applies to metallized terminal and is measured between 0.15mm and 0.30mm from the terminal tip.
7. ND refers to the maximum number of terminals on side D.
8. Unilateral coplanarity zone applies to the exposed heat sink slug as well as the terminals
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AS1337
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 listed in Table 5.
Table 5. Ordering Information
Ordering Code
Marking
Descriptiom
Delivery Form
AS1337A-BTDT
ASSE
200mA, DC-DC Step-Up Converter with Buck
Mode; Battery Connect in Shutdown
Tape and Reel
Package
TDFN (3x3mm)
8-pin
AS1337B-BTDT*
ASSF
200mA, DC-DC Step-Up Converter with Buck
Mode; Battery Disconnect in Shutdown
Tape and Reel
TDFN (3x3mm)
8-pin
*) on request
Note: All products are RoHS compliant and Pb-free.
Buy our products or get free samples online at ICdirect: http://www.austriamicrosystems.com/ICdirect
For further information and requests, please contact us mailto:[email protected]
or find your local distributor at http://www.austriamicrosystems.com/distributor
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AS1337
Datasheet
Copyrights
Copyright © 1997-2009, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe.
Trademarks Registered ®. 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.
Disclaimer
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
www.austriamicrosystems.com
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