SA57017-16D [PHILIPS]

Regulator, 1 Output, CMOS, PDSO5;
SA57017-16D
型号: SA57017-16D
厂家: PHILIPS SEMICONDUCTORS    PHILIPS SEMICONDUCTORS
描述:

Regulator, 1 Output, CMOS, PDSO5

光电二极管 输出元件 调节器
文件: 总13页 (文件大小:141K)
中文:  中文翻译
下载:  下载PDF数据表文档文件
INTEGRATED CIRCUITS  
SA57017-XX  
CapFREE 150 mA, low-noise,  
low-dropout regulator with thermal  
protection  
Product data  
2003 Aug 27  
Supersedes data of 2003 Aug 13  
Philips  
Semiconductors  
Philips Semiconductors  
Product data  
CapFREE 150 mA, low-noise, low-dropout regulator  
with thermal protection  
SA57017-XX  
GENERAL DESCRIPTION  
The CapFREE SA57017 is one of a family of unique low dropout  
regulators. It needs no external capacitors, offers a low output noise  
voltage of 25 µVrms, and an ultra-low dropout voltage of 50 mV  
max. @ 50 mA output current. Reverse battery current is extremely  
low, 0.5 µA typical.  
To accommodate high density layouts, it is packaged in the small  
footprint 5 leaded SOT23-5 (SO5) and a 5-bump Chip-Scale  
package (WL-CSP5). It is ideal for all portable and cellular phone  
applications.  
Additional features include power and thermal shutdown, output  
current limitation, power OK status via the PWROK pin, thermal  
SO5 (SOT23)  
WL-CSP5  
warning, and external logic-controlled on-off via the PWRON pin,  
and reverse battery protection.  
FEATURES  
Shutdown (standby) current <1 µA  
CapFREE: No output capacitor needed, stable for all capacitive  
Thermal-overload and short-circuit protection  
PWROK pin - both power status and thermal warning indicator.  
Reverse Battery Protection  
loads, regardless of ESR.  
5 leaded (SO5) SOT23-5 and Wafer level Chip-Scale (WL-CSP5)  
packages  
Low 25 µVrms noise without noise bypass capacitor.  
Max line regulation 0.15%/V  
Preset output voltages to 1.25, 1.8, 2.4 2.6, 2.8, 3.0, and 3.3V  
Max load regulation 0.015%/mA  
other voltages available upon request.  
1% output voltage accuracy.  
APPLICATIONS  
150 mA Maximum Output Current with current limitation.  
Typical dropout voltage 50 mV max. @ 50 mA output current  
85 µA typical ground current  
Cordless and mobile phones  
Industrial and medical equipment  
Other battery-powered equipment  
SIMPLIFIED DEVICE DIAGRAM  
R
OK  
SA57017-XX  
(5)  
A3  
(4)  
V
PWROK  
PWRON  
OUT  
C3  
(2)  
B2  
Preset output voltages:  
1.25 V to 3.3 V  
R
Load  
(1)  
A1  
(3)  
C1  
ON  
OFF  
V
IN  
GND  
DC  
1.6 V to 4.6 V  
Top view (Wafer-level CSP pin assignments using JEDEC standard matrix)  
(SOT23-5 package pin assignments in parentheses)  
SL02029  
Figure 1. Simplified device diagram.  
CapFREE is a trademark of Philips Electronics North America Corporation.  
2003 Aug 27  
2
853-2429 30264  
Philips Semiconductors  
Product data  
CapFREE 150 mA, low-noise, low-dropout  
regulator with thermal protection  
SA57017-XX  
ORDERING INFORMATION  
PACKAGE  
TEMPERATURE  
RANGE  
TYPE NUMBER  
NAME  
SO5  
DESCRIPTION  
SA57017-XXD  
plastic small outline package; 5 leads; body width 1.5 mm  
wafer-level, chip-scale 5 bump package, surface mount  
–40 to +85 °C  
–40 to +85 °C  
SA57017-XXUK  
WL-CSP5  
NOTE:  
Part marking: Each device is marked with a four letter code. The first  
three letters designate the product. The fourth, represented by an  
‘x’, designates date tracking code.  
The device has seven (7) voltage output options, indicated by the  
XX on the Type Number.  
XX  
12  
16  
18  
20  
22  
24  
26  
28  
30  
33  
VOLTAGE (Typical)  
1.25 V  
1.6 V  
Part  
Marking  
A C B X  
A B V X  
A B U X  
A B T X  
A B S X  
A B R X  
A C D X  
A C E X  
A C F X  
A C G X  
SA57017-12D, UK  
SA57017-16D, UK  
SA57017-18D, UK  
SA57017-20D, UK  
SA57017-22D, UK  
SA57017-24D, UK  
SA57017-26D, UK  
SA57017-28D, UK  
SA57017-30D, UK  
SA57017-33D, UK  
1.8 V  
2.0 V  
2.2 V  
2.4 V  
2.6 V  
2.8 V  
3.0 V  
3.3 V  
PIN CONFIGURATION  
PIN DESCRIPTION  
PIN  
NO.  
BALL  
NO.  
SYM-  
BOL  
DESCRIPTION  
SA57017-XX  
1
A1  
V
IN  
Regulator input.  
+0.5V to 4.6 V.  
PWROK  
V
A3  
A1  
C3  
V
OUT(nom)  
OUT  
Minimum input voltage required  
is 1.6 V. No capacitor required.  
B2  
2
3
B2  
C1  
GND  
Ground  
GND  
V
PWRON  
SL02030  
C1  
IN  
PWRON Power on input.  
Active HIGH. A logic LOW  
powers down the regulator. The  
shutdown quiescent current is  
typically 50 nA. Connect to VIN  
for normal operation.  
Figure 2. Pin configuration, top view (balls are on the bottom)  
4
C3  
PWROK Connect a 10 kup to 100 kΩ  
resistor between PWROK and  
V
. Active LOW open-drain  
OUT  
1
2
5
4
V
V
output indicates an  
out-of-regulation condition when  
power falls typically 6% below  
OUT  
IN  
SA57017-XX  
GND  
V
, or thermal warning  
OUT(NOM)  
(trips at 133 °C ± 2 °C).  
If not used, leave this pin  
unconnected.  
3
PWROK  
PWRON  
5
A3  
V
OUT  
Regulator output.  
SL02031  
Sources up to 150 mA. No  
capacitor required.  
Figure 3. Pin configuration, top view  
3
2003 Aug 27  
Philips Semiconductors  
Product data  
CapFREE 150 mA, low-noise, low-dropout  
regulator with thermal protection  
SA57017-XX  
MAXIMUM RATINGS  
SYMBOL  
PARAMETER  
MIN.  
–0.3  
–0.3  
–0.3  
–40  
MAX.  
4.6  
UNIT  
Vdc  
Vdc  
Vdc  
°C  
VIN  
VIN to GND voltage  
V
PWRON to GND voltage  
OUT to GND voltage  
4.6  
PWRON  
OUT  
V
V
+ 0.3  
IN  
T
Operating ambient temperature  
Junction temperature  
+85  
amb  
Tj  
+125  
+160  
637  
°C  
T
stg  
Storage temperature  
–65  
°C  
Power dissipation (T  
= 25 °C)  
mW  
amb  
P
D
Power dissipation degrading factor above 25 °C = 5.1 mW/°C  
R
Thermal resistance from junction to ambient  
140  
°C/W  
th(j-a)  
NOTE:  
1. Maximum Ratings are those values beyond which damage to the device may occur. Exposure to these conditions or conditions beyond  
those indicated may adversely affect device reliability. Functional operation under absolute maximum-rated condition is not implied.  
Functional operation should be restricted to the Recommended Operating Condition.  
4
2003 Aug 27  
Philips Semiconductors  
Product data  
CapFREE 150 mA, low-noise, low-dropout  
regulator with thermal protection  
SA57017-XX  
ELECTRICAL CHARACTERISTICS  
V
IN  
= V  
+ 0.5 V, T  
= –40 °C to +85 °C, unless otherwise noted (Note 1)  
OUT(nom)  
amb  
Symbol  
Parameter  
Input voltage  
Conditions  
Min  
Typ  
Max  
Units  
V
VIN  
V
4.6  
OUT(nom)  
Output Voltage Accuracy (Note 2)  
%
1.6 V t V  
3.3 V  
OUT(nom)  
I
= 1 mA to 150 mA  
OUT  
T
= +25 °C  
–1  
+1  
1.5  
amb  
–40 °C T  
+85 °C  
–3.0  
amb  
1.25 V V  
1.6 V  
OUT(nom)  
I
= 1 mA  
–3.0  
–4.0  
160  
2.5  
1.5  
OUT  
I
= 150 mA  
OUT  
ILIM  
IQ  
Current Limit  
300  
250  
0.5  
500  
400  
mA  
µA  
Ground Pin Current  
I
= 1 mA to 150 mA  
OUT  
IRBC  
Reverse Battery Current  
Dropout Voltage (Note 2, and 6)  
µA  
mV  
I
= 50 mA  
50  
OUT  
I
I
= 100 mA  
= 150 mA  
100  
150  
OUT  
OUT  
VLNR  
Line Regulation  
%/V  
1.6 V t V  
3.3 V  
OUT(nom)  
V
0.5 V VIN 3.6 V  
0.5 V VIN 4.2 V  
0.15  
0.25  
out(nom) +  
V
out(nom) +  
1.25 V t V  
1.6 V  
OUT(nom)  
V
0.5 V VIN 3.6 V  
0.5 V VIN 4.2 V  
0.25  
0.35  
out(nom) +  
V
out(nom) +  
VLDR  
Load Regulation  
%/ mA  
1.6 V t V  
3.3 V  
OUT(nom)  
I
= 1 mA to 150 mA  
0.015  
OUT  
1.25 V t V  
1.6 V  
OUT(nom)  
I
= 1 mA to 150 mA  
0.02  
OUT  
en  
Output Voltage Noise  
f = 10 Hz to 100 kHz,  
25  
µVRMS  
I
= 150 mA  
OUT  
Shutdown  
PWRON input Threshold (HI On)  
PWRON input Bias Current  
V
V 4.6 V  
V
VIH  
VIL  
0.7 x VIN  
0.3 x VIN  
out(nom)  
IN  
I
V
= VIN  
1
nA  
nA  
µs  
%
PWRON  
PWRON  
IQ(SHDN) Shutdown Supply Current  
V
= 0 V  
40  
30  
–1  
2
OUT  
t
PWRON Startup Time (Note 3)  
I
= 1 to 50 mA, T =  
amb  
–40 °C to +85 °C  
50  
–4  
PWRON  
OUT  
Load transient, under–voltage  
(Note 5)  
I
= 1 to 50 mA in 2 µs  
OUT  
Load transient, overshoot (Note 5)  
Recovery Time (Note 4, 5)  
I
= 50 to 1 mA in 2 µs  
= 1 to 50 mA in 2 µs  
4
2
1
1
%
µs  
µs  
µs  
OUT  
t
r
I
OUT  
I
= 50 to 100 mA in 2 µs  
OUT  
I
= 100 to 150 mA in 2 µs  
OUT  
5
2003 Aug 27  
Philips Semiconductors  
Product data  
CapFREE 150 mA, low-noise, low-dropout  
regulator with thermal protection  
SA57017-XX  
Symbol  
Parameter  
Conditions  
Min  
Typ  
Max  
Units  
Thermal Protection  
TSHDN  
Thermal Shutdown Temperature  
163  
10  
°C  
°C  
TSHDN Thermal Shutdown Hysteresis  
Output (Power & Temperature OK) (Note 2)  
PWROK Trip Temperature  
133  
10  
°C  
°C  
PWROK Trip Temperature  
Hysteresis  
PWROK Trip as percentage of  
–3  
–6  
–10  
0.4  
%
V
V
(Note 5)  
OUT(nom)  
PWROK Output (when tripped)  
Pull–up resistor = 10 KΩ  
0.1  
ISINK = 0.5 mA  
NOTES:  
1. Limits are production tested at worst case ambient temperature (85 °C)  
2. The dropout voltage is defined as V -V , where V is 100 mV below the value of V  
for V = V +0.5 V (only applicable for  
OUT  
IN OUT  
OUT  
OUT  
IN  
1.6 V t V  
3.3 V).  
OUT(NOM)  
3. Time needed for V  
to reach 95% of V  
OUT  
OUT(nom)  
4. Output settling time, to within accuracy limits, when there is a pulsed load current.  
5. The PWROK has a 10 µs blanking time to allow transient responses to settle within accuracy limits.  
6. Minimum input voltage is 1.6 V if selected the 1.25 V preset output voltage.  
6
2003 Aug 27  
Philips Semiconductors  
Product data  
CapFREE 150 mA, low-noise, low-dropout  
regulator with thermal protection  
SA57017-XX  
TYPICAL PERFORMANCE CURVES  
SA57017-18 (1.8 volt output). V = V  
+ 0.5 V, C  
= C = 0 µF, T  
amb  
= –40 to +85 °C, unless otherwise specified.  
IN  
OUT(nom)  
OUT  
IN  
1.784  
1.782  
1.780  
1.778  
1.776  
1.774  
1.772  
1.770  
1.768  
1.796  
1.794  
1.792  
1.790  
1.788  
1.786  
1.784  
1.782  
1.780  
I
= 150 mA  
I
= 1 mA  
LOAD  
LOAD  
–40  
–20  
0
20  
40  
60  
80  
100  
–40  
–20  
0
20  
40  
60  
80  
100  
T
amb,  
TEMPERATURE °C  
T
amb,  
TEMPERATURE °C  
SL02033  
SL02032  
Figure 4. Output voltage versus temperature.  
Figure 5. Output voltage versus temperature.  
90  
85  
80  
75  
70  
65  
60  
–40  
–20  
0
20  
40  
60  
80  
100  
T
amb,  
TEMPERATURE °C  
SL02034  
Figure 6. Drop-out voltage versus temperature.  
7
2003 Aug 27  
Philips Semiconductors  
Product data  
CapFREE 150 mA, low-noise, low-dropout  
regulator with thermal protection  
SA57017-XX  
TECHNICAL DISCUSSION  
The SA57017 is a low drop-out, low-quiescent current linear  
Bias Circuit  
regulator designed primarily for battery-powered applications and  
stabilizes with or without input/output capacitors. The device delivers  
up to 150 mA and is available with preset output voltages of 1.25 V,  
1.6 V, 1.8 V, 2.0 V, 2.2 V, 2.4 V, and 2.6 V, 2.8 V, 3.0 V, and 3.3 V for  
both SOT 23-5 and WL-CSP packages.  
The bias block provides bias currents and voltages for the other  
blocks. It has a self start-up circuit and it can establish the bias  
currents and voltages very fast.  
Temperature Sensor  
The temperature sensor block monitors the die temperature and  
flags Power OK when the temperature crosses 133 °C. If the die  
temperature goes beyond 165 °C typical value the output amplifier is  
shut down. Both the temperatures corresponding to PWROK or  
PWRON have a hysteresis of 10 °C.  
The 1.25 band-gap reference is connected to the error amplifier’s  
inverting input. The error amplifier compares this reference with the  
feedback voltage and amplifies the difference. If the feedback  
voltage is lower than the reference voltage, the pass-transistor gate  
is pulled lower, which allows more current to pass to the output. The  
output voltage is fed back through an internal resistor voltage divider  
connected to the Vout pin.  
Reverse Battery Protection  
The reverse battery protection circuit prevents damage to the device  
if the supply battery is accidentally installed backwards. This circuit  
compares VIN and PWRON to ground and disconnects the device’s  
internal circuits if it detects reversed polarity. Reverse supply current  
is limited to 1mA when this protective circuit is active, preventing the  
battery from rapidly discharging through the device. Reverse  
battery current is extremely low, 0.5 mA typical.  
Band-gap  
The band-gap circuitry generates a temperature independent  
voltage by properly adding two voltages with negative and positive  
temperature coefficient. The band-gap voltage is typically 1.25 volts  
with a temperature variation of 5 mV over the temperature range  
from –40 °C to 125 °C.  
PWROK Output  
Low Pass Filter  
PWROK goes low when the output voltage goes out of regulation as  
during drop-out, current limit or thermal shutdown. PowerOK is an  
open-drain N-channel MOSFET. To obtain a logic-level output,  
Low pass filter is basically an RC filter with a low cutoff frequency.  
No external capacitor is used. There is one comparator, which  
turns on the bypass paths to charge or discharge the capacitor if the  
output of the filter is higher or lower than the band-gap voltage by a  
specified amount.  
connect a 10 kpull-up resistor from PWROK pin to V  
pin. To  
OUT  
minimize current consumption, make this resistor as large as  
practical. A 100 kresistor works well for most applications. The  
PowerOK is not active during shutdown. PWROK has a 10 µs  
blanking time to allow transient responses to settle within accuracy  
limits.  
Output Amplifier  
The output amplifier is a folded cascode PMOS amplifier which  
controls the gate of the output transistor and sources the load  
current. A portion of the output voltage is compared to the reference  
voltage and a constant voltage is maintained at output. The output is  
also monitored by a comparator which trips the PWROK if the output  
voltage falls below the nominal output level by a specified amount  
due to low battery condition or any other reason. The current limiter  
circuit monitors the output current and limits the load current to a  
certain value to avoid any damage due to short circuit.  
Current Limit  
The SA57017 includes a current limiter that monitors and controls  
the pass transistor’s gate voltage, limiting the output current to  
300 mA typical value. For design purposes, consider the current  
limit to be 160 mA minimum value. The output can be shorted to  
ground for an indefinite period of time without damaging the part.  
8
2003 Aug 27  
Philips Semiconductors  
Product data  
CapFREE 150 mA, low-noise, low-dropout  
regulator with thermal protection  
SA57017-XX  
SIMPLIFIED BLOCK DIAGRAM  
REVERSE  
BATTERY  
PROTECTION  
PWRON  
3
TEMP.  
SENSOR  
LOGIC  
CONTROL  
4
5
PWROK  
LOW  
PASS  
FILTER  
BAND GAP  
OUTPUT  
AMP  
OUT  
GND  
2
1
BIAS  
NETWORK  
V
IN  
SA57017-XX  
SL02061  
Figure 7. Simplified block diagram.  
TIMING DIAGRAM  
V
+ 0.5 V  
OUT(nom)  
V
IN  
V
+ V  
DROPOUT  
OUT(nom)  
V
OUT(nom)  
–6%  
2% HYSTERESIS  
–8%  
10 µs blanking time  
to avoid heavy loads  
transient response  
PWROK  
LOGIC_ON  
LOGIC_ON  
LOGIC_ON  
LOGIC_OFF  
LOGIC_OFF  
SL02062  
Figure 8. Timing diagram.  
9
2003 Aug 27  
Philips Semiconductors  
Product data  
CapFREE 150 mA, low-noise, low-dropout  
regulator with thermal protection  
SA57017-XX  
WL-CSP5: wafer level, chip-scale package; 5 bumps  
X3  
X2  
X4  
X5  
X1  
X6  
X7  
BUMP  
DIMENSIONS (mm are the original dimensions)  
UNIT  
X1  
X2  
X3  
X4  
X5  
X6  
X7  
1.30  
1.24  
0.87  
0.81  
0.195  
0.165  
0.568  
0.548  
0.145  
0.115  
mm  
0.5  
0.5  
SL02067  
10  
2003 Aug 27  
Philips Semiconductors  
Product data  
CapFREE 150 mA, low-noise, low-dropout  
regulator with thermal protection  
SA57017-XX  
SOT23-5: plastic small outline package; 5 leads; body width 1.5 mm  
0.15  
0.05  
1.2  
1.0  
0.55  
0.41  
0.22  
0.08  
3.00  
2.70  
1.70  
1.50  
0.55  
0.35  
0.25  
1.35  
11  
2003 Aug 27  
Philips Semiconductors  
Product data  
CapFREE 150 mA, low-noise, low-dropout  
regulator with thermal protection  
SA57017-XX  
CSP TAPE AND REEL  
LOADED TAPE DIRECTION OF FEED  
NOTES:  
All dimensions in millimeters.  
10 sprocket hole pitch cumulative tolerance ±0.20  
Material: conductive polystyrene  
Camber not to exceed 1.0 mm in 100 mm.  
Cover tape shown for illustrative purposes only.  
P
+0.1  
+0.0  
4.00  
2.00 ±0.01  
1.5  
1.75  
X
X
3.50 ±0.01  
W
Ao  
CENTER LINES OF CAVITY  
BOTTOM  
COVER  
TAPE  
TOP COVER TAPE  
T
DIMENSIONS (mm are the original dimensions)  
UNIT  
Ao  
Bo  
T
T1  
P
W
TOP COVER TAPE  
1.09  
0.99  
1.598  
1.498  
0.76  
0.74  
0.10  
(max.)  
4.05  
3.95  
8.3  
7.9  
Bo  
mm  
Heat seal cover tape for carrier tape width 8 mm  
BOTTOM  
COVER  
TAPE  
Type tape:  
clear static dissipative tape  
transparent polyester  
Base material:  
T1  
Cover tape width: 5.3 ± 0.1 mm  
Cover tape length: 480 m/reel  
T1  
SECTION ‘X – X’  
Supplier:  
Advanced Integrated Materials (AIM)  
CT5–00530–0480  
Part Number:  
SL02056  
12  
2003 Aug 27  
Philips Semiconductors  
Product data  
CapFREE 150 mA, low-noise, low-dropout  
regulator with thermal protection  
SA57017-XX  
REVISION HISTORY  
Rev  
Date  
Description  
_3  
2003 Aug 27  
Product data (9397 750 11971); ECN 853-2429 30264 of 27 August 2003  
Modifications:  
– Adjusted part marking code table  
– Adjusted voltage output options table  
_2  
_1  
2003 Aug 13  
2003 May 29  
Product data (9397 750 11912); ECN 853-2429 30151 of 28 July 2003  
Product data (9397 750 11567); ECN 853-2429 29965 of 29 May 2003  
Data sheet status  
Product  
status  
Definitions  
[1]  
Level  
Data sheet status  
[2] [3]  
I
Objective data  
Development  
This data sheet contains data from the objective specification for product development.  
Philips Semiconductors reserves the right to change the specification in any manner without notice.  
II  
Preliminary data  
Qualification  
Production  
This data sheet contains data from the preliminary specification. Supplementary data will be published  
at a later date. Philips Semiconductors reserves the right to change the specification without notice, in  
order to improve the design and supply the best possible product.  
III  
Product data  
This data sheet contains data from the product specification. Philips Semiconductors reserves the  
right to make changes at any time in order to improve the design, manufacturing and supply. Relevant  
changes will be communicated via a Customer Product/Process Change Notification (CPCN).  
[1] Please consult the most recently issued data sheet before initiating or completing a design.  
[2] The product status of the device(s) described in this data sheet may have changed since this data sheet was published. The latest information is available on the Internet at URL  
http://www.semiconductors.philips.com.  
[3] For data sheets describing multiple type numbers, the highest-level product status determines the data sheet status.  
Definitions  
Short-form specification — The data in a short-form specification is extracted from a full data sheet with the same type number and title. For detailed information see  
the relevant data sheet or data handbook.  
LimitingvaluesdefinitionLimiting values given are in accordance with the Absolute Maximum Rating System (IEC 60134). Stress above one or more of the limiting  
values may cause permanent damage to the device. These are stress ratings only and operation of the device at these or at any other conditions above those given  
in the Characteristics sections of the specification is not implied. Exposure to limiting values for extended periods may affect device reliability.  
Application information — Applications that are described herein for any of these products are for illustrative purposes only. Philips Semiconductors make no  
representation or warranty that such applications will be suitable for the specified use without further testing or modification.  
Disclaimers  
Life support — These products are not designed for use in life support appliances, devices, or systems where malfunction of these products can reasonably be  
expected to result in personal injury. Philips Semiconductors customers using or selling these products for use in such applications do so at their own risk and agree  
to fully indemnify Philips Semiconductors for any damages resulting from such application.  
Right to make changes — Philips Semiconductors reserves the right to make changes in the products—including circuits, standard cells, and/or software—described  
or contained herein in order to improve design and/or performance. When the product is in full production (status ‘Production’), relevant changes will be communicated  
viaaCustomerProduct/ProcessChangeNotification(CPCN).PhilipsSemiconductorsassumesnoresponsibilityorliabilityfortheuseofanyoftheseproducts,conveys  
nolicenseortitleunderanypatent, copyright, ormaskworkrighttotheseproducts, andmakesnorepresentationsorwarrantiesthattheseproductsarefreefrompatent,  
copyright, or mask work right infringement, unless otherwise specified.  
Koninklijke Philips Electronics N.V. 2003  
Contact information  
All rights reserved. Printed in U.S.A.  
For additional information please visit  
http://www.semiconductors.philips.com.  
Fax: +31 40 27 24825  
Date of release: 08-03  
9397 750 11971  
For sales offices addresses send e-mail to:  
sales.addresses@www.semiconductors.philips.com.  
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Semiconductors  

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