EXAR B130

X RP7 6 7 4
2 A 1 8 V Sy n c h r o n o u s P FM / P W M St e p - D o w n R e g u l a t o r
February 2013
Rev. 1.0.0
GENERAL DESCRIPTION
APPLICATIONS
The XRP7674 is a 2A capable synchronous
current - mode PWM step down (buck) voltage
regulator
with improved
light current load
efficiency. A wide 4.5V to 18V input voltage
range allows for single supply operations from
industry standard 5V and 12V power rails.
With a 340kHz constant operating frequency
and
integrated
high
and
low - side
10PŸ
0PŸ 026)(7V
,
the
XRP7674
reduces the overall component count and
solution footprint.
Current - mode control
provides fast transient response and cycle
- by cycle OCP. An adjustable soft - start prevents
inrush current at turn
- on, and in shutdown
mode the supply current drops to 0
.1µ A. At
light current loads, the XRP7674 operates in
Discontinuous Conduction Mode (
DCM) and is
complemented
by
a
pulse
frequency
modulation mode (P FM) to provide excellent
conversion efficiency.
Built - in output over - voltage (open load) , over
temperature ,
cycle - by - cycle
over - current ,
under - voltage lockout (UVLO)
and hiccup
mode short - circuit protection
insure s safe
operation
under
abnormal
operating
conditions.
The XRP7674 is offered in a RoHS compliant,
³JUHHQ´KDORJHQIUHH
- pin SOIC package .
TYPICAL APPLICATION
x Distributed Power Architecture
x Portable
Equipment
x Point of Load Converter
x Audio - Video Equipment
FEATURES
x 2A Continuous
Output Current
x 4. 5V to 18V Wide Input
Voltage
0.925V to 16V Adjustable Output Voltage
±2% Output Voltage Accuracy
x PWM Curren
t - Mode Control
340kHz Constant Operations
Up to 9 5% Efficiency
x Light - Load efficiency
Discontinuous Conduction Mode (DCM)
Pulse Frequency Modulation
x Programmable Soft
Function
Mode (P FM)
- Start and Enable
x Built - in Thermal , Over - Current , UVLO,
Output Over - Voltage and hiccup mode
short - circuit protection
x 5R+6&RPSOLDQW³*UHHQ´+DOR
Free 8 - Pin SOIC Package
DIAGRAM
Fig. 1: XRP7674 Application Diagram
Exar Corporation
48720 Kato Road, Fremont CA 94538, USA
Tel. +1 510 668
www.exar.com
- 70 00 ±Fax. +1 510 668 - 70 01
X RP7 6 7 4
2 A 1 8 V Sy n c h r o n o u s P FM / P W M St e p - D o w n R e g u l a t o r
ABSOLUTE MAXIMUM
RATINGS
OPERATING RATINGS
Input Voltage VIN ................................
......... 4.5V to 18 V
Ambient Operating Temperature
................
- 40°C to 85 °C
Maximum Output Current ................................
.... 2A min
7KHUPDO5HVLVWDQFHLJ
................................
.....
105 °C/W
JA
These are stress ratings only and functional operation of
the device at these ratings or any other above those
indicated in the operation sections of the specifications
below is not implied. Exposure to absolute maximum
rating conditions for extend
ed periods of time may affect
reliability.
Supply Voltage VIN ................................
...... - 0.3V to 20 V
Switch Node Voltage VSW ................................
......... 21 V
Boost Voltage VBS ................................
... - 0.3 to VSW +6 V
Enable Voltage VEN ................................
......... - 0.3 to VIN
All Other Pins ................................
.............. - 0.3 to +6 V
Junction Temperature
................................
.......... 150°C
Storage Temperature ..............................
- 65°C to 150°C
Lead Temperature (Soldering, 10 sec)
...................
26 0°C
ESD Rating (HBM - Human Body Model) ....................
2kV
ESD Rating (MM - Machine Model) ...........................
200V
Moisture Sensitivity Level (MSL)
................................
... 3
ELECTRICAL SPECIFICA
TIONS
Specifications are for an Operating
Ambient Temperature of T A = 25°C only; limits applying over the full
Ambient Operating
THPSHUDWXUHUDQJHDUHGHQRWHGE\D³‡´0LQLPXPDQG0D[LPXPOLPLWVDUH
through test, design, or statistical
correlation. Typical values represent the most likely parametric norm at T
A = 25°C, and are provided for reference purposes
only. Unless otherwise indicated, V
IN = V EN = 12 V, V OUT=3.3V .
Typ.
Max.
Units
Shutdown Supply Current
Parameter
0.1
10
µA
VEN=0V
Quiescent Current
1. 2
1. 4
mA
VEN= 3V, V FB=1V
0.925
0.9 43
V
0.1
µA
Feedback Voltage
Min.
VFB
0.90 7
Feedback Overvoltage Threshold
1.1
Feedback Bias Current
- 0.1
Error Amplifier Voltage
Gain A EA
1
Conditions
V
VFB=1V
400
V/V
800
µA/V
COMP to Current Sense
Transconductance G CS
3.5
A/V
High - Side switch On Resistance
RDSONH 2
100
PŸ
I SW =0.2A&0.7A
Low - Side switch On Resistance
RDSONL 2
100
PŸ
I SW = - 0.2A& -0.7A
High - Side switch Leakage
Current
0.1
µA
VIN =18V, V
Error Amplifier
Transconductance G
EA
High - Side Switch Current Limit
2.7
Low - Side Switch Current Limit
Oscillator Frequency
FOSC1
Short Circuit Oscillator
Frequency FOSC2
Maximum Duty
Minimum Start
28 0
340
- up
Minimum Full Load Start
Voltage
© 2013 Exar Corporation
- up
EN=0V,
V
SW =0V
A
0
A
40 0
Drain to Source
kHz
kHz
90
%
VFB=0.85V
%
VFB=1V
10
mA
VIN ”9
5
V
I OUT=0A
4.75
V
I OUT=2A
0
MIN
- up Current
Minimum No Load Start
Voltage
3.5
90
Cycle D MAX
Minimum Duty Cycle D
10
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Rev. 1.0.0
X RP7 6 7 4
2 A 1 8 V Sy n c h r o n o u s P FM / P W M St e p - D o w n R e g u l a t o r
Parameter
EN Shutdown Threshold
EN Shutdown Hysteresis
Min.
Typ.
Max.
1.1
1.5
2
1
0.35
EN Lockout Threshold
2.2
EN Lockout Hysteresis
2.5
2.7
0.21
UVLO Threshold
3.65
UVLO Hysteresis
4.00
4.25
0.20
Units
V
V
V
5
µA
Soft - start Time 1
15
ms
160
°C
30
°C
1
Thermal Shutdown Hysteresis
1
VIN Rising
V
Soft - start Current
Thermal Shutdown
Conditions
CSS=0.1µF, I
OUT=500mA
Note 1: Guaranteed by design.
Note 2: RDSON =(V SW1 - VSW2 )/(I SW1 -I SW2 )
BLOCK DIAGRAM
Fig. 2: XRP7674 Block Diagram
© 2013 Exar Corporation
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Rev. 1.0.0
X RP7 6 7 4
2 A 1 8 V Sy n c h r o n o u s P FM / P W M St e p - D o w n R e g u l a t o r
PIN ASSIGNMENT
Fig. 3: XRP7674 Pin Assignment
(SOIC - 8)
PIN DESCRIPTION
Name
Pin Number
Description
BS
1
Bootstrap pin.
Connect a 0.01µF or greater
bootstrap capacitor between the BS pin and the SW pin.
The voltage across the bootstrap capacitor drives the internal high
- side power MOSFET.
IN
2
Power input pin.
A capacitor should be connected between the IN pin and GND pin to keep the input
voltage constant.
SW
3
Power switch output pin.
This pin is connected to the inductor and the bootstrap capacitor.
GND
4
Ground pin.
5
Feedback pin.
An external resistor divider
connected to FB programs the output voltage.
If the
feedback pin exceeds 1.1V the over
- voltage protection will trigger. If the feedback
voltage drops below 0.3V the o
scillator frequency is lowered
to achieve short - circuit
protection.
6
Compensation pin.
This is the output of transconductance e
rror amplifier and the input to the current
comparator. It is used to compensate the control loop. Connect an RC network form
this pin to GND.
EN
7
Control input pin.
Drive EN high/low in order to turn on/off the regulator
. When the IC is in shutdown
mode all functions are disabled to decrease the supply current below 1µA.
This input
FDQEHFRQQHFWHGWR9,1SLQWKURXJKDNƻUHVL
operations.
SS
8
Soft - start control input pin.
Connect a capacitor from SS to GND to set th
e soft - start period. A 0.1µF capacitor sets
the soft start period to 1
5ms. To disable the soft - start feature, leave SS unconnected.
FB
COMP
ORDERING INFORMATION
Part Number
XRP7674 IDTR -F
XRP7674 EVB
Temperature
Range
Marking
XRP7674 I
YYWWF
X
XRP7674 Evaluation Board
- ƒ&”7
A”ƒ&
Packing
Quantity
Package
SOIC -8
2.5 K/Tape & Reel
Note 1
Note 2
RoHS Compliant
Halogen Free
³<<´ <HDU
±³::´ :RUN:HHN
±³;´ /RW1XPEHU
; when applicable.
© 2013 Exar Corporation
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Rev. 1.0.0
X RP7 6 7 4
2 A 1 8 V Sy n c h r o n o u s P FM / P W M St e p - D o w n R e g u l a t o r
TYPICAL PERFORMANCE
CHARACTERISTICS
All data taken at V IN = 12 V, VOUT=3.3V,
Information section of this datasheet.
TJ = T
A
= 25°C, unless otherwise specified
Fig. 5: Quiescent current
Fig. 4: Efficiency versus output current
Fig. 6: Feedback voltage
Fig. 8: Output voltage
- Schematic and BOM from Application
Fig. 7: Output voltage versus
versus temperature
load current
versus input voltage
Fig. 9: Minimum Start
© 2013 Exar Corporation
versus temperature
5/ 12
- Up Voltage vs Output Current
Rev. 1.0.0
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2 A 1 8 V Sy n c h r o n o u s P FM / P W M St e p - D o w n R e g u l a t o r
Fig. 10 : Output voltage ripple
I OUT=2A
Fig. 11 : Load transient
I OUT= 1A to 2A
Fig. 12 : Enable turn on Characteristics
VIN =12V, VEN=3.3V, VOUT=3.3V, I OUT=2A
Fig. 13 : Enable turn off
VIN =12V, V EN=3.3V, V OUT=3.3V, I
Fig. 14 : Short - circuit protection
I OUT=2A
© 2013 Exar Corporation
OUT=2A
Fig. 15 : Short - circuit recovery
I OUT=2A
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Rev. 1.0.0
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2 A 1 8 V Sy n c h r o n o u s P FM / P W M St e p - D o w n R e g u l a t o r
THEORY OF OPERATION
F UNCTIONAL
OVERCURRENT PROTECTI
MODE
D ESCRIPTION
The OCP protects against accidental increase
in load current
or a short circuit.
The current
of internal switch M1 is monitored. If this
current exceed s 3.5A typical then a hiccup
mode is triggered . In hiccup mode, internal
power FETs are turned off and the SS pin is
discharged. When SS reaches 0.2V a softstar
t
is initiated. The regul ator will stay in hiccup
mode until overcurrent is removed. Note that
when the soft start pin
is below approximately
0.5V the
regulator switching frequency is
90kHz.
The XRP7674 is a synchronous, current
- mode,
step - down regulator with light - load efficiency .
The light - load efficiency
is achiev ed by
monitoring the current throu gh M2 and turning
it off when current drops below 0A.
The
XRP7674 regulates input voltages from
4.5V to
18V and supplies up to 2A of load current
. It
uses current - mode control to regulate the
output voltage. The output voltage is
measured at FB through a resistive voltage
divider and input to a transconductance error
amplifier. The high - side switch current is
compared to the output of the error amplifi
er
to control the output voltage.
The regulator
utilizes internal N - channel MOSFETs to step down the input voltage. A bootstrapping
capacitor connected between BS and SW acts
as a supply for high - side MOSFET. This
capacitor is charge d from the internal 5V
supply when SW node is low.
The XRP7674
has several powerful protection fe
atures
including OCP, OVP, OTP,
UVLO and output
short - circuit .
PROGRAMMABLE SOFT
ON AND HICCUP
OVERVOLTAGE PROTECTI
ON OVP
The XRP7674 has internal OVP. When V OUT
exceeds the OVP thre shold (when V FB exceeds
1.1V) the power switching
will be turned off .
The XRP7674 will restart when
overvoltage
condition is removed .
OVER - TEMPERATURE PROTECTI
ON OTP
If the junction temperature exceeds 160
OTP circuit is triggered, turning off the in
control circuit and switched M1 and M2.
junction temperature drops below 1
XRP7674 will restart.
- START
The soft - start time is fully programmable via
CSS capacitor , placed between the SS and
GND pin . The CSS is charged by a
5µA
constant - current source, generating a ramp
signal fed into non - inverting input of the error
amplifier. This ramp regulates the voltage on
comp pin during the regulator startup, thus
realizing soft - start. Calculate the required CSS
from:
° C the
ternal
When
30° C the
ͷɊ‫ܣ‬
‫ܵܵܥ‬
ൎ‫ݏݏݐ‬
ൈ
ܸ
ி஻
Where:
tss is the required soft
- start time
VFB is the feedback voltage
(0.925V nominal)
Please no te that the above is a simplified
equation and will provide an approximate CSS
value. For a required soft
- start, a more
accurate CSS can be determined based on
empirical data.
© 2013 Exar Corporation
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Rev. 1.0.0
X RP7 6 7 4
2 A 1 8 V Sy n c h r o n o u s P FM / P W M St e p - D o w n R e g u l a t o r
APPLICATION INFORMAT
SETTING THE OUTPUT V
ION
VOUT(V)
OLTAGE
3.3
2.5
1.8
1.5
1.2
Use an external resistor divider to set the
output voltage. Program the output voltage
from:
Ʃ,
L(p - p) (A)
L(µH)
0.70
0.78
0. 72
0.66
0. 57
4.7
4.7
4.7
4.7
4.7
Where:
OUTPUT CAPACITOR
OUT
and FB
R2 is the resistor between FB and GND
QRPLQDOO\NŸ
0.925V is the nominal feedback voltage
DR74 -4R7 - R
DR74 -4R7 - R
DR74 -4R7 - R
DR74 -4R7 - R
DR74 -4R7 - R
Table 2: Suggested inductor values
for VIN=5V and IOUT=2A
ܸ
ை௎்
ܴͳൌܴʹൈ൬
െͳ൰
ͲǤ
ͻʹͷ
ܸ
R1 is the resistor between V
Inductor
Example
.
OUTPUT INDUCTOR
Select the output inductor for inductance L, DC
current rating I DC and saturation current rating
I SAT. I DC should be larger than regulator output
current. I SAT, as a rule of thumb, should be
50% higher than the
regulator output current.
Since the regulator is rated at 2A then
I DC•$
and I SAT•$
Calculate the inductance f
rom:
ܸ
ை௎்
ሻ൬
‫ܮ‬ൌሺ
ܸ
൰
ூேെܸ
ை௎்
߂‫ܫ‬
௅ൈ݂
௦ൈܸ
ூே
COUT
Select the output capacitor for
voltage rating,
capacitance C OUT and
Equivalent Series
Resistance ESR . The voltage rating, as a rule
of thumb, should be at least twice the output
voltage. When calculating
the
required
capacitance,
usually
the
overriding
requirement is current load
- step transient. If
the unloading transient (i.e., when load
transitions from
a high to a low
current ) is
met, then usually the loading transient (when
load transitions from a low to a high
current )
is met as well.
Therefore c alculate the C OUT
based on the unload ing transient requirement
from:
ଶ
ଶ
‫ܫ‬
ு௜௚
௛ െ‫ܫ‬
௅௢௪
‫ܥ‬ை௎்ൌ‫ܮ‬ൈቆ
ቇ
ଶെܸ ଶ
ሺ
ሻ
ܸ
ை௎
் ൅ܸ
௧௥௔௡௦௜௘௡௧
ை௎்
Where:
Where:
Ʃ,
L is peak - to - peak inductor current ripple
nominally set to 30%
- 40% of I OUT
L is the inductance calculated in the preceding
step
f S is nominal switching frequency (340kHz)
I High is the value of load - step prior to
unloading. This is nominally set equal to
regulator current rating (2A).
As an example , inductor values for
common output voltages are shown in
and 2 .
VOUT(V)
5.0
3.3
2.5
1.8
1.5
1.2
Ʃ,
L( p - p ) (A)
L( µ H)
0.86
0.70
0.70
0.66
0.57
0.68
10
10
8.2
6.8
6.8
4.7
several
table s 1
I Low is the value of load - step after unloading.
This is nominally set equal to
50% of regulator
current rating ( 1A).
Inductor
Example
Vtransient is the maximum permissible voltage
transient corresponding to the load step
mentioned above. V transient is typically specified
from 3% to 5% of VOUT.
DR74 -100 - R
DR74 -100 - R
DR74 -8R2 - R
DR74 -6R8 - R
DR74 -6R8 - R
DR74 -4R7 - R
ESR of the capacitor ha s to be selected such
that the output voltage ripple requirement
Ʃ9
OUT, nominally 1% of V
OUT, is met. Voltage
ripple Ʃ9
is mainly composed of t wo
OUT
components : the resistive ripple due to ESR
and capacitive ripple due to
COUT charge
transfer. For applications requiring low
voltage
ripple , ceramic capacitors are recommended
Table 1: Suggested inductor values
for VIN=12V and IOUT=2A
© 2013 Exar Corporation
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Rev. 1.0.0
X RP7 6 7 4
2 A 1 8 V Sy n c h r o n o u s P FM / P W M St e p - D o w n R e g u l a t o r
because of their low ESR
which is typically
in
the range of PŸ
. Therefore Ʃ9
is
mainly
OUT
capa citive. For ceramic capacitors c alculate
the Ʃ9
OUT from:
߂ܸ
ை௎்ൌ
EXTERNAL BOOTSTRAP D
A low - cost diode , such as 1N4148 , may
provide
higher efficiency when
the input
voltage is 5V or the output is 5V or 3.3V.
Circuit configuration is
shown in figures 16 and
17. The external bootstrap diode is also
recommended where duty cycle
(V OUT/V IN ) is
larger than 65%.
߂‫ܫ‬
௅
ͺൈ‫ܥ‬ை௎்ൈ݂
௦
Where:
Ʃ,
L is from table 1
IODE
or 2 in previous section
1N4148
COUT is the value calculated above
VI N = 5V
f s is nominal switching frequency (340kHz)
IN
If tantalum or electrolytic
capacitors are used
WKHQƩ
VOUT is essentially a function of ESR:
BS
SW
߂ܸ
‫ܫ‬
ை௎்ൌ߂
௅ൈ‫ܴܵܧ‬
INPUT CAPACITOR
10nF
XRP7 6 7 4
CIN
Fig. 16 : Optional external bootstrap diode
where input voltage is fixed 5V
Select the input capacitor for voltage rating,
RMS current rating and capacitance. The
voltage rating
should be at least 50% higher
1N4148
than the regul ator ¶V
maximum input voltage.
BS
&DOFXODWHWKHFDSDFLWRU¶VFXUUHQWUDWLQJIURP
10nF
XRP7 6 7 4
‫ܫ‬
ൈඥ‫ܦ‬ൈሺ
ͳെ‫ܦ‬ሻ
஼ூே
ǡ
ோெௌൌ‫ܫ‬
ை௎்
VOUT = 5V
or 3.3V
SW
Where:
I OUT LVUHJXODWRU¶VPD[LPXPFXUUHQW$
D is duty cycle (D=V
Calculate the C
‫ܥ‬ூேൌ
IN
OUT /V IN )
capacitance from:
Fig. 17 : Optional external bootstrap diode
where output voltage is 5V or
3.3V
ሻ
‫ܫ‬
ൈܸ
ൈሺ
ܸ
ை௎்
ை௎்
ூேെܸ
ை௎்
ଶ
݂
ܸ
௦ൈܸ
ூே ൈ߂
ூே
LOOP COMPENSATION
Where:
XRP7674 utilizes current - mode control . This
allows using a minimum of external
components to compensate the regulator. In
general only two components are needed: RC
and CC. Proper compensation of the regulator
(determining RC and CC)
results in optimum
transient response.
In terms of power supply
control theory, t he goals of compensation are
to choose RC and CC such that the regulator
loop gain has a crossover frequency fc
between 15kHz and 34kHz. The corresponding
phase - margin should be between 45 degrees
and 65 degrees. An important characteristic of
current - mode buck regulator is its dominant
pole. The frequency of the
dominant pole is
given by:
Ʃ9
IN is the permissible input voltage ripple,
nominally set at 1% of V
IN
O PTIONAL S CHOTTKY DIODE
An optional Schottky diode may be paralleled
between the GND pin and SW pin to improve
the regulator efficiency.
See Table 3.
Part Number
COUT
Voltage/Current
Rating
B130
SK13
30V/1A
30V/1A
MBRS130
30V/1A
Vend or
Diodes, Inc.
Diodes, Inc.
International
Rectifier
Table 3: Optional Schottky diode
© 2013 Exar Corporation
9/ 12
Rev. 1.0.0
X RP7 6 7 4
2 A 1 8 V Sy n c h r o n o u s P FM / P W M St e p - D o w n R e g u l a t o r
݂
௣ൌ
where R
load
ͳ
ʹߨൈ‫ܥ‬ை௎்ൈܴ௟௢௔ௗ
is the output load resistance
݂
௭ൌ
.
The uncompensated regulator has a constant
gain up to its pole frequency, beyond which
the gain decreases at
- 20dB/decade. The zero
arising from the output capacitor
¶
s ESR is
inconsequential if ceramic C
is
used.
This
OUT
simplifies the compensation.
The RC and CC,
which are placed between the output of
XRP7674 ¶V (UURU $PSOLILHU
constitute a zero. The frequency of this
compensating zero is given by:
ͳ
ʹߨൈܴ‫ܥ‬ൈ‫ܥܥ‬
For the typical application circuit,
RC= 13 NŸ
and
CC= 4.7 nF
provide
a
satisfactory
compensation . The XRP7674 can also be used
as a pin to pin upgrade
replacement for
XRP7664 based designs; in this instance, the
recommended RC network for XRP7664,
RC=5.6k and CC=3.3nF , can be used with
satisfactory results
with the XRP7674 . Please
contact EXAR if you need assistance with the
DQG JURXQG
compensation
of your particular circuit.
TYPICAL APPLICATIONS
Fig. 18 : XRP7674 Typical Application Diagram
© 2013 Exar Corporation
10 / 12
- 12V to 3.3V Conversion
Rev. 1.0.0
X RP7 6 7 4
2 A 1 8 V Sy n c h r o n o u s P FM / P W M St e p - D o w n R e g u l a t o r
PACKAGE SPECIFICATIO
N
8 - P IN SOIC
Unit: mm
(inch)
© 2013 Exar Corporation
11 / 12
Rev. 1.0.0
X RP7 6 7 4
2 A 1 8 V Sy n c h r o n o u s P FM / P W M St e p - D o w n R e g u l a t o r
REVISION HISTORY
Revision
Date
1.0.0
02/28 /2013
FOR FURTHER ASSISTAN
Description
Initial release of datasheet
CE
Email:
[email protected]
[email protected]
Exar Technical Documentation:
http://www.exar.com/TechDoc/default.aspx?
EXAR CORPORATION
H EADQUARTERS AND
S ALES O FFICES
48720 Kato Road
Fremont, CA 94538
±USA
Tel.: +1 (510) 668
- 70 00
Fax: +1 (510) 668
- 7030
www.exar.com
NOTICE
EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve
design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein,
conveys no li cense under any patent or other right, and makes no representation that the circuits are free of patent
infringement. Charts and schedules contained here in are only for illustration purposes and may vary depending upon a
XVHU¶VVSHFLILFDSSOLFDWLRQ:KLOH
the information in this publication has been carefully checked; no responsibility, however,
is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or
malfunction of th e product can reasonably be expected to cause failure of the life support system or to significantly affect its
safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation receives, in
writing, assurances to it
s satisfaction that: (a) the risk of injury or damage has been minimized; (b) the user assumes all
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