ams AS7620A-BQFT 500ma hysteretic high voltage step-down converter with dual power monitor Datasheet

Datasheet
AS7620
5 0 0 m A H y s t e r e t i c H i g h Vo l ta g e St e p - D o w n C o n v e r t e r
with Dual Power Monitor
1 General Description
2 Key Features
The AS7620 is an easy-to-use, high-efficiency, highvoltage, hysteretic step-down DC-DC converter,
operating in asynchronous mode. Its low-power
architecture extends hold-up time in battery-backed and
critical applications where maximum up-time over a wide
input supply voltage range is needed, while still
providing for high efficiencies of up to 90% during peak
current demands.
Although the AS7620 is optimized for 24V applications
found in industrial and medical systems, its ability to
support 100% Duty Cycle makes the AS7620 ideal for
applications demanding maximum up-time and soft
power fail behavior. In combination with low idle current
of only 30µA, on-demand switching reduces operating
current at low load currents.
By selecting an appropriate inductor value, operating
current can be lowered and switching frequencies tuned
to certain load conditions.
!
Low quiescent current for efficient partial load
operation
!
Wide Supply Voltage Range, 3.6V to 32V
!
100% Duty Cycle extends operating range
!
Pin-programmable cycle-by-cycle current limit
!
Integrated PMOS eliminates bootstrap capacitor
!
Resistor-programmable Early Power Fail Warning
Input
!
Power-Good Flag
!
Thermal Shutdown
!
Fixed 3.3V and adjustable output (1.2V to VIN)
!
Small 4x4mm 12-Lead MLPQ Enhanced Power
Package
!
Specified from -40ºC to +125ºC junction and 85ºC
maximum ambient temperatures
A pin-strapped current limit input minimizes inductor
peak current and thus inductor size and cost for any
given application.
3 Applications
The device further includes output short-circuit
protection and thermal shutdown. In shutdown mode,
only 1µA (typ) of current is consumed.
The AS7620 is suitable for Industrial 24VDC
applications like PLCs, robotics; Home Security and
Building Control applications; Solid-state utility meters;
Signage and LED column power; and Sensor interfaces.
Figure 1. Block Diagram
VIN
LDO
Temp
SHDN
FB
Hysteretic
Controller
Level
Shifter
Soft-Start
+
-
ISENSE
LX
ILIM
PG
VREF
+
-
PF
AS7620
VEPF
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+
-
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AS7620
Datasheet - P i n A s s i g n m e n t s
4 Pin Assignments
2
LX
3
VEPF
PF
10
AS7620
PGND
4
5
6
ILIM
GND
11
FB
1
12
GND
VIN
PG
Figure 2. Pin Assignments (Top View)
9
GND
8
GND
7
SHDN
Pin Descriptions
Table 1. Pin Descriptions
Pin Name
Pin Number
VIN
1
High Voltage Power Supply Input
GND
2
Must be connected to GND
LX
3
Power Output to Inductor
GND
4
Must be connected to GND
FB
5
Feedback input
ILIM
6
Current Limit input
SHDN
7
Shutdown input, active low
GND
8
Must be connected to GND
GND
9
Must be connected to GND
PF
10
Early Power Fail output, open drain, active LOW
VEPF
11
Comparator voltage input for early power fail warning
PG
12
Power Good, open drain, active HIGH output, monitors feedback voltage
PGND
Pad
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Description
Exposed pad. Connect to GND plane to help thermal dissipation
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AS7620
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
Min
Max
Units
VIN
-0.3
40
V
LX
-0.3
VIN+0.3
V
FB, SHDN
-0.3
VIN+0.3
or 5.5
V
All other pins except LX, FB and SHDN
-0.3
3.6
V
Latch-Up
-30
+30
mA
Norm: JEDEC 78
1
W
θJA = 32ºC/W for a 4-layer board, 4 vias,
TAMB = +70ºC
ºC
Junction temperature
Norm: HBM MIL-Std. 883E 3015.7 methods
Package Power Dissipation
Operating Temperature Range
-40
+125
Electrostatic Discharge
-1000
+1000
V
Humidity (Non-Condensing)
5
90
%R.H.
Storage Temperature
-55
125
ºC
150
ºC
Junction Temperature
Package body temperature
260
ºC
Comments
Whichever is lower
1
Norm: IPC/JEDEC J-STD-020D.
The reflow peak soldering temperature (body
temperature) specified is in accordance with
IPC/JEDEC J-STD-020D “Moisture/Reflow
Sensitivity Classification for Non-Hermetic
Solid State Surface Mount Devices”.
1. Voltage on pin 7 (SHDN) limited to +5.5V
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AS7620
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
TJ = -40 to +125ºC, VOUT=3.3V, LX=10µH, CX=100µF (unless otherwise specified). Typ. values at VIN= +24V and
TAMB= +25ºC.
Table 3. Electrical Characteristics
Symbol
VIN
VCC
VST
Parameter
Input Voltage Range
Conditions
VEPF, ILIM
Start-up Voltage
VFB
Output Voltage
Feedback voltage
AS7620-B
AS7620-A
Controller
Hysteresis
AS7620-A
AS7620-B
Max
Units
24
32
V
3.6
V
-0.3
V
1.19
Initial, at 25ºC amb.
3.267
Over line, load and temperature
3.218
Initial, at 25ºC amb.
1.178
Over line and temperature
1.166
AS7620-B
VHYS
Typ
3.6
3.3
AS7620-A
VOUT
Min
3.218
At FB node
VIN
3.300
3.333
3.383
1.190
1.202
1.214
3.300
3.383
8
15
30
22
42
82
V
V
V
V
mV
VEPF
Early Power Fail Threshold
at VEPF
VPG
Power Good Threshold
of VFB at FB pin
Line Regulation
VIN=8V to 24V, RL=200Ω
0.1
%/V
Load Regulation
10% to 90% load change
0.9
%
IFB
IOUT
Input Bias
Current
AS7620-A
AS7620-B
1.19
FB pin
Output Current
1
Switch Current Limit
ILIM=VOUT
2
ILIM=open
Maximum Duty Cycle
At VIN=3.6V
tON
Minimum On-Time
Current limit is not attained to turn
off the switch before the minimum
on-time expired
tOFF
Minimum Off-Time
IQ
Quiescent Current
ISHDN
Shutdown Current
VLO
Shutdown Threshold
IIBN
Logic Input Bias Current
TSHDN
Shutdown Temperature
TAMB
%
200
nA
5
µA
ILIM/2
mA
240
288
576
720
864
800
1000
1200
0.4
0.8
Ω
100
%
mA
8
10
12
µs
0.22
0.42
0.62
µs
Non-switching
30
45
µA
IOUT=500µA
37
1
µA
5
µA
SHDN
1
V
SHDN
1
µA
175
ºC
150
TSHDN Hysteresis
Operating Temperature
95
192
P-Channel on resistance
TJ
93
3
ILIM=0V
ILIM
91
V
10
ºC
junction
-40
125
ºC
ambient
-40
85
ºC
1. LX=100µH, CX=10µF, Initial accuracy only. For temperature variation, please refer to performance graphs.
2. VOUT from 1.5V to 3.6V
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AS7620
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
Figure 3. Efficiency vs Output Current, VOUT=4.5V
Figure 4. PMOS Rdson vs. Temperature
1000
100
900
VIN=12V
800
Rdson (mohm) .
Efficiency (%)
90
VIN=5V
VIN=24V
80
VIN=32V
70
60
50
700
600
500
400
300
200
40
100
0
-40 -20
30
1
10
100
1000
0
Figure 5. GND Current vs. IOUT @ TAMB
40
60
80 100 120
Figure 6. GND Current vs. Temperature @ IOUT=0A
42.0
10000
VIN=24V
1000
38.0
VIN=12V
VIN=5V
100 VIN=32V
VIN=24V
40.0
IGND (uA)
IGND (uA)
20
Temp (C)
Iout (mA)
36.0
34.0
32.0
10
VIN=12V
VIN=32V
30.0
80
10
0
12
0
Temp (C)
Iout (mA)
Figure 7. Current Limit Threshold vs VIN
1300
1200
1100
1000
900
800
700
600
500
400
300
200
100
0
60
1000.0
40
100.0
0
10.0
-4
0
-2
0
1.0
20
VIN=5V
28.0
1
Figure 8. Average Switching Frequency vs VIN
1000000
IOUT=500mA
100000
Fsw (Hz)
CL (mA)
ILIM FLOATING
ILIM VOUT
IOUT=50mA
10000
IOUT=5mA
1000
ILIM GND
IOUT=500µA
100
5
10
15
20
25
5 7 9 11 13 15 1719 21 23 25 27 29 31
30
Vin (V)
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Vin (V)
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AS7620
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. Average Switching Frequency vs IOUT
(ILIM=open)
Figure 10. Shutdown Current vs. Temperature
1.8
330000
VIN=24V
1.7
300000
1.6
270000
VIN=12V
210000
Fsw (Hz)
ISHDN (uA)
240000
180000
150000
VIN=32V
120000
VIN=5V
VIN=32V
1.5
1.4
VIN=24V
1.3
1.2
VIN=12V
1.1
90000
1
60000
VIN=5V
0.9
30000
0.8
-40 -20
0
0
100
200
300
400
500
0
20
Figure 11. Line Regulation @ IOUT=10mA
60
80 100 120
Figure 12. Line Regulation @ IOUT=500mA
0.800%
0.400%
0.600%
0.300%
Vout Variation (%)
Vout Variation (%)
40
Temp (C)
Iout (mA)
0.400%
0.200%
0.000%
-0.200%
-0.400%
0.200%
0.100%
0.000%
-0.100%
-0.200%
-0.600%
-0.300%
-0.800%
-0.400%
-10%
-10%
10%
10%
Vin Variation (%)
Vin Variation (%)
Figure 13. Load Regulation
Figure 14. Line Regulation VOUT=5V @ 10mA
1.000%
0.800%
Vout Variation %
0.600%
VOUT
0.400%
0.200%
0.000%
-0.200% 0.1
1
10
100
1000
-0.400%
VIN
-0.600%
-0.800%
-1.000%
Iout (mA)
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AS7620
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. Line Regulation VOUT=5V @ 10mA
Figure 16. Load Regulation VOUT=5V 10mA→500mA
VOUT
VIN
Note: All measurements taken at VIN=24V, VOUT=3.3V, and TAMB=25ºC using the typical application circuit specified
in Figure 17, unless otherwise specified.
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AS7620
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
Figure 17. System Diagram of AS7620-A with Early Power Fail Warning
3.6V to 32V
VIN
3.3V
CIN
2.2µF
R6
R3
VIN
R7
VHYS
10µH
LX
VOUT
R4
VEPF
R5
AS7620-A
FB
D1 COUT
100µF
SHDN
ILIM
PF
PG
R1
C1
R3
J1
J2
Table 4. AS7620 Output Voltage Options
AS7620
AS7620A-BQFT
AS7620B-BQFT
VOUT
ADJ.
3.3V
Shut Down
The device can be shut down by providing a voltage lower than 1V at the SHDN pin (7). In this condition, the
consumption is only 1µA (typ.). The AS7620 is providing an internally regulated pull-up circuit. No external pull-up
resistor shall be used, which could otherwise damage the shutdown input. Connect the SHDN input directly to an open
drain port only.
Soft Start
The device implements a soft start by limiting the inrush current into the output choke. Initially, the internal PMOS is
turned on until the current reaches the programmed current limit (see Current Limit on page 9) and then is immediately
turned off. It will be turned on again when the current approaches 0A. In this time frame, the FB voltage (VFB) will be
lower than the reference and so the duty cycle will be driven by the current limit only.
Regulation
Both AS7620-A and AS7620-B are based on a hysteretic control method. Moreover, the switch current is monitored to
make the converter always work in discontinuous current mode (DCM). The advantages of this type of control system
can be summarized as following:
!
High efficiency even at light load
!
Intrinsically stable
!
Simplicity
!
Readiness during the load transient
The internal PMOS is switched on when the VFB is lower than VREF-VHYST/2 and the current is 0A (DCM). The on time
will be terminated if the VFB is over VREF+VHYST/2 or if the current limit (CL) is triggered. In practice, considering the
most common application conditions (L=10µH ÷ 100µH; C=10µF - 100µF) and setting the CL threshold according to
the load, the on time is normally terminated by the CL intervention and the output voltage ripple will stay within 1.25%
of the output voltage (typ.) or VHYST * VOUT / VREF.
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AS7620
Datasheet - D e t a i l e d D e s c r i p t i o n
VOUT Selection
The AS7620-B features a 3.3V fixed output voltage. The AS7620-A provides an adjustable output from 1.2V (VREF) up
to virtually VIN (see 100% Duty Cycle Operation on page 11). To select the desired VOUT, the related resistor divider
has to be tuned according to the following formula:
Rh
V OUT = V REF • ⎛ 1 + -------⎞
⎝
Rl ⎠
(EQ 1)
Where:
Rh is the high side resistor of the output divider
Rl is the resistor of the output divider
Note: It is suggested to select resistors in the range of hundreds of kΩ in order to limit the current consumption.
Current Limit
The current is sensed during the on time of the internal PMOS. Three different current limit thresholds can be selected
by the ILIM pin:
1. 240mA (typ.) ILIM shorted to GND
2. 720mA (typ.) ILIM shorted to VOUT (from 1.5V to 3.6V)
3. 1000mA (typ.) ILIM floating
This threshold is intended as peak current limit. If the current reaches the threshold during the on time, the PMOS is
turned off and it will be turned on again only when the current approaches 0A and the feedback voltage is equal or
lower than VREF. The maximum output current is ILIM/2.
Switching Frequency
The switching frequency (fsw) changes according to the application conditions and, in particular, to the output current in
order to optimize the efficiency in any load condition. Anyway, it is always possible to estimate the fsw during the design
process. As described in the Regulation (refer to page 8) – the converter always works in DCM and, normally, the peak
current into the inductor is the CL threshold (ILIM). The average of the inductor current must be equal to the output
current. The following formula provides the relationship between inductor current and output current:
1
Tsw
2
ILIM • L • V
( V IN – V OUT ) • V OUT
1
2
IN
IOUT = ---------- • --- • --------------------------------------------------
(EQ 2)
Consequently, the fsw can be expressed as following:
2 • I OUT • ( V IN – V OUT ) • V OUT
Fsw = --------------------------------------------------------------------------2
ILIM • L • V IN
(EQ 3)
Figure 18. Chart Illustrating the Fsw vs. IOUT in a Standard Application (VIN=24V, VOUT=3.3V, L=10µH, ILIM=1A)
Fsw vs. Iout
300
Fsw (KHz)
250
200
150
100
50
0
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
0.45
0.5
Iout (A)
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AS7620
Datasheet - D e t a i l e d D e s c r i p t i o n
Power Fail / Power Good
AS7620A-B monitors input and output voltage by VEPF (pin 11) and VFB (pin 5) respectively. Two dedicated flags PF
(pin 10) and PG (pin 12) are provided outside to inform about early input power fail (active low) and output within
regulation. Figure 19 illustrates the typical connection for VEPF. During start up, PF is initially low. By selecting R3, R4,
R5 and R6, it is possible to set the desired input voltage threshold above which the input power is considered stable.
Once VIN (VDDH in Figure 19) reaches Vinth, PF is released and so an additional voltage contribution from VDD is
added at the VPF pin, realizing in fact a hysteresis to eliminate PF oscillation due to power supply noise.
Figure 19. Open-Drain Output Stage for Comparator
VDD
1.2…3.6
VDDH
3.6…32V
R6
Power Fail
RON
VREF
R3
INV
+
R4
R5
Table 5 provides the resistors values covering all the standard input BUS. The resistors values are 1% commercial
values. It is mandatory to use the correct resistors values to guarantee the respect of maximum absolute voltages at
EPF and PF pin. VDD has been considered 3.3V. Otherwise EPF pin should be shorted to GND and PF left floating.
Terminology:
VRST: Reset voltage for the EPF. It is 90% of the Input BUS voltage.
VTRIP: Trip voltage for the EPF. It is 80% of the Input BUS voltage.
Table 5. EPF Network Selection with Different Input BUS
VIN (V)
VRST (V)
VTRIP (V)
R3 (KΩ)
R4 (KΩ)
R5 (KΩ)
R6 (KΩ)
5
4.5
4
365
143
1740
1370
6
5.4
4.8
464
143
1870
1430
9
8.1
7.2
768
140
2050
1580
12
10.8
9.6
1070
140
2100
1650
15
13.5
12
1370
140
2150
1690
20
18
16
1870
140
2210
1740
24
21.6
19.2
2260
140
2260
1740
28
25.3
22.5
2670
140
2260
1740
Thermal Protection
The internal junction temperature is continuously monitored. If it reaches 150ºC (min), the PMOS is turned off. The
device can switch again if the temperature is decreased by at least 10ºC. If the over-temperature persists, the device
will be shut down again resulting in a hiccup mode for the output power.
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AS7620
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
Input Capacitors
An input capacitor is required to sustain the peak current requested by the turning on of the internal PMOS. When
used, the capacitor helps to reduce the noise and saves the input battery life. The input capacitor has to withstand the
input RMS current, which can be calculated by the following formula:
V OUT • ( V IN – V OUT )
Irms = I OUT • -------------------------------------------------V IN
(EQ 4)
While designing for wide input/output voltage range, the worst case of Irms=1/2*IOUT must be considered. Suggested
capacitors are low ESR OSCON, polymer, aluminum or MLCCs. Tantalum types are not recommended for their
weakness in withstanding big inrush currents.
Output Inductor
The inductor together with the output capacitor represents the output filter. Using the AS7620, the inductor is charged
and completely discharged at every switching cycle being that the converter is forced to work in DCM. Values from
10µH to 100µH are suitable to work with AS7620 and its selection should consider the following statements:
!
Bigger inductor implies lower fsw
!
Bigger inductor implies lower bandwidth
2
The inductor must be rated to withstand the peak current (ILIM) and the RMS current Irms =
ΔIL
2
I OUT + ----------3
Output Capacitor
The output capacitor together with the inductor represents the output filter. The bigger the capacitance is, the lower will
be the output ripple. Usually, low ESR MLCCs are preferred as they are inexpensive and small in size. Any value from
10µF is suitable, considering the load transient specifications of the application as well.
Free Wheeling Diode
The inductor current is forced through the diode during the off-times. The average current flowing through it is
2
1
ILIM • L
--- • fsw • -----------------------2
V OUT
The reverse voltage must be higher than the input voltage and safely it is common to consider 30% more. Normally, a
schottky diode is preferred because of its low forward voltage.
Stability
Even though the hysteretic voltage mode is intrinsically stable, an excessive noise at the FB could cause instability. For
this reason care must be taken drawing the layout, reducing the noise and shielding the FB path from it. The main
noise generator is the switching node, which is commutated from GND to VIN by the internal PMOS and the free
wheeling diode and through which a pulse current flows. It is wise to add a MLCC capacitor as close as possible to the
VIN pin of the device and provide a wide/short path between the LX pin and the external components (inductor and
diode). It is preferable to draw the FB path as far as possible from the LX node and, perhaps, shielding it with a GND
track. Another recommendation is to use low ESL output capacitors, thus avoiding electrolytic parts. A big ESL adds a
square wave contribution on the FB that can make the device work improperly.
100% Duty Cycle Operation
Thanks to the PMOS structure of the internal switch, the device can actually work at 100% duty cycle. This feature is
very helpful during the load transient, because the maximum power can be transferred to the output in order to recover
as fastest. The device will try to work at 100% duty whenever the FB voltage is lower than the upper window’s
threshold. Moreover, in this condition, the safety is always guaranteed by the current limit.
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AS7620
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
Demo Board
A demonstration board is available to test the device functionalities and performance in a standard application. For
further information, please refer to the AS7620EB datasheet.
Figure 20. Demo Board Photograph
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AS7620
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 12-Lead MLPQ package.
Figure 21. 4x4mm MLPQ Package Drawings
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AS7620
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
Table 6. 4x4mm MLPQ Package Dimensions
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AS7620
Datasheet - O r d e r i n g I n f o r m a t i o n
11 Ordering Information
The devices are available as the standard products shown in Table 7.
Table 7. Ordering Information
Ordering Code
Marking
Description
Delivery Form
Package
AS7620A-BQFT
AS7620 or
AS7620A
500mA hysteretic buck converter,
adjustable output
Tape and Reel
12-Lead MLPQ, 4x4mm
AS7620B-BQFT*
AS7620B
500mA hysteretic buck converter,
3.3V output
Tape and Reel
12-Lead MLPQ, 4x4mm
*) on request
Note: All products are RoHS compliant and Pb-free.
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AS7620
Datasheet
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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,
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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
Revision 1.13
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