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AME
AME5258
n General Description
The AME5258 is a high efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. The device is available in an adjustable version and fixed output voltages of 1.2V, 1.8V, 2.5V and 3.3V. Supply current with no load is 300A and drops to <1A in shutdown. The 2.5V to 5.5V input voltage range makes the AME5258 ideally suited for single Li-Ion battery-powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. PWM pulse skipping mode operation provides very low output ripple voltage for noise sensitive applications. At very light load, the AME5258 will automatically skip pulses in pulse skip mode operation to maintain output regulation. The AME5258 is simple to use. As with standard LDO's,Input and output capacitor are required. The only other element is a small, low cost, 2.2H inductor.Low output voltages are easily supported with the 0.6V feedback reference voltage. And 100% duty cycle when Vin approaches Vout.
1.5MHz, 600mA Synchronous Buck Converter
n Applications
l Cellular Phones l Digital Cameras l Portable Electronics l USB Devices l MP3 Players l LDO Replacement
n Typical Application
Fixed Output Voltage
2.2H VIN C IN 4.7F CER IN SW VOUT
AME5258
EN GND OUT C OUT 10F CER
n Features
l High Efficiency: Up to 96% l 600mA Output Current at VIN=3V l 2.5V to 5.5V Input Voltage Range l 1.5MHz Constant Frequency Operation l No Schottky Diode Required l Low Dropout Operation: 100% Duty Cycle l 0.6V Reference Allows Low Output Voltages l Shutdown Mode Draws<1A Supply Current l Current Mode Operation for Excellent Line and Load Transient Response l Overtemperature Protection l Internal Soft Start l Space Saving 5-Pin SOT-25 Package l Meet RoHS Standards
Figure 1: High Efficiency Step-Down Conventer
Adjustable Output Voltage
VIN = 2.5V to 5.5V VIN IN C IN 4.7F CER 2.2H SW 22pF FB GND R2 442K R1 887K VOUT 1.8V 600mA C OUT 10F CER
AME5258
EN
VOUT=VFB (R1+R2)/R2
Figure 2: 1.8V at 600mA Step-Down Requlator
Rev.A.05
1
AME
AME5258
n Function Diagram
1.5MHz, 600mA Synchronous Buck Converter
IN 0.6V VFB 5 + Slope COMP +
4
IN
ICOMP
0.55V
UVDET + SWITCHING LOGIC AND BLANKING CIRCUIT +
3
SW
0.65V
OVDET + IRCMP 2 GND OSC -
EN 1
0.6V VREF
Figure 3: Founction Block Diagram
2
Rev.A.05
AME
AME5258
n Pin Configuration
SOT-25 Top View
5 4
1.5MHz, 600mA Synchronous Buck Converter
( Fixed Output ) AME5258-AEVxxx 1. EN 2. GND
SOT-25 Top View
5 4
( Adjustable Output ) AME5258-BEVADJ 1. EN 2. GND
AME5258
3. SW 4. IN 5. OUT
AME5258
3. SW 4. IN 5. FB
1
2
3
1
2
3
* Die Attach: Conductive Epoxy
* Die Attach: Conductive Epoxy
n Pin Description
Pin Number Pin Name
AME5258-AEVxxx AME5258-BEVADJ Enable Control Input. Forcing this pin above 1.5V enables the part. Forcing this pin below 0.3V shuts down the device. In shutdown, all functions are disabled drawing <1A supply current. Do not leave EN floating. Ground Pin Switch Node Connection to Inductor. This pin connects to the drains of the internal main and synchronous power MOSFET switches. Main Supply Pin. Must be closely decoupled to GND, Pin2, with a 4.7F or greater ceramic capactior. Feedback Pin. Receives the feedback voltage from an external resistive divider across the output. Output Voltage for fixed version
Pin Description
1
1
EN
2
2
GND
3
3
SW
4
4
IN
N/A
5
FB
5
N/A
OUT
Rev.A.05
3
AME
AME5258
n Ordering Information AME5258 - x x x xxx
1.5MHz, 600mA Synchronous Buck Converter
Output Voltage Number of Pins Package Type Pin Configuration
Pin Configuration A
(SOT-25)
Package Type E: SOT-2X
Number of Pins V: 5
Output Voltage
1. EN 2. GND 3. SW 4. IN 5. OUT 1. EN 2. GND 3. SW 4. IN 5. FB
120: 180: 250: 330:
1.2V 1.8V 2.5V 3.3V
B
(SOT-25)
E: SOT-2X
V: 5
ADJ: Adjustable
4
Rev.A.05
AME
AME5258
n Available Options
Part Number
AME5258-BEVADJ AME5258-AEV120 AME5258-AEV180 AME5258-AEV250 AME5258-AEV330
1.5MHz, 600mA Synchronous Buck Converter
Marking*
BWMMXX BYRMXX BYJMXX BYNMXX BYFMXX
Output Voltage
ADJ 1.2V 1.8V 2.5V 3.3V
Package
SOT-25 SOT-25 SOT-25 SOT-25 SOT-25
Operating Ambient Temperature Range
-40OC to +85OC -40OC to +85OC -40OC to +85OC -40OC to +85OC -40OC to +85OC
Note: 1. The first 3 places represent product code. It is assigned by AME such as BWM. 2. A bar on top of first letter represents Green Part such as BWM. 3. The last 3 places MXX represent Marking Code. It contains M as date code in "month", XX as LN code and that is for AME internal use only. Please refer to date code rule section for detail information. 4. Please consult AME sales office or authorized Rep./Distributor for the availability of output voltage and package type.
n Absolute Maximum Ratings
Parameter
Input Supply Voltage EN, FB Voltages SW Voltage P-Channel Switch Source Current (DC) N-Channel Switch Sink Current (DC) ESD Classification
Symbol
VIN VEN ,VFB VSW ISW ISW
Maximum
6 VIN -0.3 to (V IN +0.3) 900 900 C*
Unit
V V V mA mA
Caution: Stress above the listed in absolute maximum ratings may cause permanent damage to the device. * HBM C: 4000V ~ 6000V
Rev.A.05
5
AME
AME5258
n Recommended Operating Conditions
Parameter
Ambient Temperature Range Junction Temperature Range Storage Temperature Range
1.5MHz, 600mA Synchronous Buck Converter
Symbol
TA TJ TSTG
Rating
-40 to +85 -40 to +125 -65 to +150
Unit
o
C C C
o
o
n Thermal Information
Parameter
Thermal Resistance* (Junction to Case) Thermal Resistance (Junction to Ambient) Internal Power Dissipation Solder Iron (10 Sec)**
Package
SOT-25
Die Attach
Symbol
JC JA PD
Maximum
81
Unit
o
C/W
SOT-25
Conductive Epoxy
260
o
C/W mW
o
SOT-25
400 350
C
* Measure JC on center of molding compound if IC has no tab. ** MIL-STD-202G 210F
6
Rev.A.05
AME
AME5258
n Electrical Specifications
TA=25oC. VIN=3.6V unless otherwise specified.
Parameter Input Volatge Feedback Current Regulated Feedback Voltage Reference Voltage Line Regulation Symbol VI N IFB V FB VFB
1.5MHz, 600mA Synchronous Buck Converter
Test Condition
Min 2.5
Typ
Max 5.5 30
Units V nA V %/V
AME5258-BEVADJ VIN =2.5V to 5.5V VOUT=1.2V, IOUT=100mA VOUT=1.8V, AME5258-BEVADJ
0.5880
0.6 0.04
0.6120 0.4 1.236 1.854
1.164 1.746 AME5258-AEVxxx 2.425 3.201
1.2 1.8 2.5 3.3 0.04
Regulated Output Voltage
VOUT
IOUT=100mA VOUT=2.5V, IOUT=100mA VOUT=3.3V, IOUT=100mA
V 2.575 3.399 0.4 %/V
Output Voltage Line Regulation
REGLINE
VIN =2.5V to 5.5V VI N=3V, VFB=0.5V Duty Cycle < 35% VI N=3V, VOUT=90% Duty Cycle < 35% AME5258-BEVADJ 0.75 AME5258-AEVxxx
Switch Current Limit
ICL
1
A
Output Voltage Load Regulation Shutdown Current Quiescent Current
VLOADREG ISD IQ VEN =0V, VI N=4.2V V FB=0.5V or V OUT=90% VEN =VI N=4.2V VI N=2.5V & IOUT=100mA 1.2
0.5 0.1 300 1.5 210 0.4 0.35 0.6 0.5 1 1.5 0.3 1 1 450 1.8
%
A
MHz kHz A
Oscillator Frequency RDSON of P-Channel FET RDSON of N-Channel FET Switch Leakage Current EN Input Threshold (High) EN Input Threshold (Low) EN Input Current
fOSC RDSON(P) RDSON(N) ISW V EH VEL IEN
VF B=0V or V OUT=0V ISW =100mA ISW = -100mA VEN =0V, VSW =0V or 5V,VI N=5V
V A
Rev.A.05
7
AME
AME5258
n Detailed Description
Main Control Loop The AME5258 uses a constant frequency, current modestep-down architecture. Both the main (P-channel MOSFET) and synchronous (N-channel MOSFET) switches are internal. During normal operation, the internal top power MOSFET is turned on each cycle when the oscillator sets the RS latch, and turned off when the current comparator, ICOMP, resets the RS latch. The peak inductor current at which ICOMP resets the RS latch, is controlled by the output of error amplifier EA. When the load current increases, it causes a slight decrease in the feedback voltage, FB, relative to the 0.6V reference, which in turn,causes the EA amplifier's output voltage to increase until the average inductor current matches the new load current. While the top MOSFET is off, the bottom MOSFET is turned on until either the inductor current starts to reverse, as indicated by the current reversal comparator IRCMP, or the beginning of the next clock cycle. The comparator OVDET guards against transient overshoots >7.8% by turning the main switch off and keeping it off until the fault is removed. Pulse Skipping Mode Operation At light loads, the inductor current may reach zero or reverse on each pulse. The bottom MOSFET is turned off by the current reversal comparator, IRCMP, and the switch voltage will ring. This is discontinuous mode operation, and is normal behavior for the switching regulator. Short-Circuit Protection When the output is shorted to ground, the frequency of the oscillator is reduced to about 210kHz, 1/7 the nominal frequency. This frequency foldback ensures that the inductor current has more time to decay, thereby preventing runaway. The oscillator's frequency will progressively increase to 1.5MHz when VFB or VOUT rises above 0V.
1.5MHz, 600mA Synchronous Buck Converter
Dropout Operation As the input supply voltage decreases to a value approaching the output voltage, the duty cycle increases toward the maximum on-time. Further reduction of the supply voltage forces the main switch to remain on for more than one cycle until it reaches 100% duty cycle. The output voltage will then be determined by the input voltage minus the voltage drop across the P-channel MOSFET and the inductor. An important detail to remember is that at low input supply voltages, the RDS(ON) of the P-channel switch increases (see Typical Performance Characteristics). Therefore, the user should calculate the power dissipation when the AME5258 is used at 100% duty cycle with low input Voltage.
n Application Information
Inductor Selection For most applications, the value of the inductor will fall in the range of 1H to 4.7H. Its value is chosen based on the desired ripple current. Large value inductors lower ripple current and small value inductors result in higher ripple currents. Higher V IN or V OUT also increases the ripple current as shown in equation 1. A reasonable starting point for setting ripple current is IL = 240mA (40% of 600mA).
IL=
VOUT 1 VOUT (1 - ) f L VIN
The DC current rating of the inductor should be at least equal to the maximum load current plus half the ripple current to prevent core saturation. Thus, a 720mA rated inductor should be enough for most applications (600mA+ 120mA). For better efficiency, choose a low DC-resistance inductor.
8
Rev.A.05
AME
AME5258
Inductor Core Selection Once the value for L is known, the type of inductor must be selected. High efficiency converters generally cannot afford the core loss found in low cost powdered iron cores, forcing the use of more expensive ferrite or mollypermalloy cores. Actual core loss is independent of core size for a fixed inductor value but it is very dependent on the inductance selected. As the inductance increases, core losses decrease. Unfortunately, increased inductance requires more turns of wire and therefore copper losses will increase. Ferrite designs have very low core losses and are preferred at high switching frequencies, so design goals can concentrate on copper loss and preventing saturation. Ferrite core material saturates "hard", which means that inductance collapses abruptly when the peak design current is exceeded. This result in an abrupt increase in inductor ripple current and consequent output voltage ripple. Do not allow the core to saturate! Different core materials and shapes will change the size/current and price/current relationship of an inductor. Toroid or shielded pot cores in ferrite or permalloy materials are small and don't radiate energy but generally cost more than powdered iron core inductors with similar characteristics. The choice of which style inductor to use mainly depends on the price vs. size requirements and any radiated field/EMI requirements. CIN and COUT Selection The input capacitance, CIN, is needed to filter the trapezoidal current at the source of the top MOSFET. To prevent large ripple voltage, a low ESR input capacitor sized for the maximum RMS current should be used.RMS current is given by :
1.5MHz, 600mA Synchronous Buck Converter
Several capacitors may also be paralleled to meet size or height requirements in the design. The selection of COUT is determined by the effective series resistance (ESR) that is required to minimize voltage ripple and load step transients, as well as the amount of bulk capacitance that is necessary to ensure that the control loop is stable. Loop stability can be checked by viewing the load transient response as described in a later section. The output ripple, VOUT, is determined by :
1 VOUT IL ESR + 8 f C OUT
The output ripple is highest at maximum input voltage since IL increases with input voltage. Multiple capacitors placed in parallel may be needed to meet the ESR and RMS current handling requirements. Dry tantalum, special polymer, aluminum electrolytic and ceramic capacitors are all available in surface mount packages. Special polymer capacitors offer very low ESR but have lower capacitance density than other types. Tantalum capacitors have the highest capacitance density but it is important to only use types that have been surge tested for use in switching power supplies. Aluminum electrolytic capacitors have significantly higher ESR but can be used in cost-sensitive applications provided that consideration is given to ripple current ratings and long term reliability. Ceramic capacitors have excellent low ESR characteristics but can have a high voltage coefficient and audible piezoelectric effects. The high Q of ceramic capacitors with trace inductance can also lead to significant ringing Using Ceramic Input and Output Capacitors Higher values, lower cost ceramic capacitors are now becoming available in smaller case sizes. Their high ripple current, high voltage rating and low ESR make them ideal for switching regulator applications. However, care must be taken when these capacitors are used at the input and output. When a ceramic capacitor is used at the input and the power is supplied by a wall adapter through long wires, a load step at the output can induce ringing at the input, VIN. At best, this ringing can couple to the output and be mistaken as loop instability. At worst, a sudden inrush of current through the long wires can potentially cause a voltage spike at VIN large enough to damage the part.
9
IRMS = I OUT ( max )
VOUT VIN
VIN VOUT
-1
This formula has a maximum at V IN = 2V OUT, where IRMS = IOUT/2. This simple worst-case condition is commonly used for design because even significant deviations do not offer much relief. Note that ripple current ratings from capacitor manufacturers are often based on only 2000 hours of life which makes it advisable to further derate the capacitor, or choose a capacitor rated at a higher temperature than required.
Rev.A.05
AME
AME5258
Output Voltage Programming The output voltage is set by an external resistive divider according to the following equation :
1.5MHz, 600mA Synchronous Buck Converter
VIN 2.5V to 5.5V IN AME5258 EN COUT 4.7F CER GND 604K FB 604K SW 22pF
2.2H
VOUT 1.2V C OUT 10F CER
VOUT = V REF (1 +
R2 ) R1
Where VREF equals to 0.6V typical. The resistive divider allows the FB pin to sense a fraction of the output voltage as shown in Figure 4.
0.6V VOUT 5.5V
Figure 5: 1.2V Step-Down Regulator
R2 FB
VIN 3.3V to 5.5V 2.2H IN AME5258 EN FB 475K GND 316K SW 22pF VOUT 1.5V C OUT 10F CER
AME5258
GND
R1
Figure 4: Setting the AME5258 Output Voltage Thermal Considerations In most applications the AME5258 does not dissipate much heat due to its high efficiency. But, in applications where the AME5258 is running at high ambient temperature with low supply voltage and high duty cycles, such as in dropout, the heat dissipated may exceed the maximum junction temperature of the part. If the junction temperature reaches approximately 160O C, both power switches will be turned off and the SW node will become high impedance. To avoid the AME5258 from exceeding the maximum junction temperature, the user will need to do some thermal analysis. The goal of the thermal analysis is to determine whether the power dissipated exceeds the maximum junction temperature of the part. The temperature rise is given by:
COUT 4.7F CER
Figure 6: 1.5V Step-Down Regulator
VIN 2.7V to 5.5V
2.2H IN AME5258 EN FB 1M GND 316K SW 22pF
VOUT 2.5V C OUT 10F CER
C OUT 4.7F CER
TR = ( PD)( JA )
Where PD is the power dissipated by the regulator and JA is the thermal resistance from the junction of the die to the ambient temperature. Figure 7: 2.5V Step-Down Regulator
10
Rev.A.05
AME
AME5258
VIN 3.3V to 5.5V 2.2H IN AME5258 EN COUT 4.7F CER GND 240K FB 960K SW 22pF VOUT 3V C OUT 10F CER
1.5MHz, 600mA Synchronous Buck Converter
VIN 3.6V to 5.5V 2.2H IN AME5258 EN C OUT 4.7F CER GND 196K FB 887K SW 22pF VOUT 3.3V C OUT 10F CER
Figure 8: 3V Step-Down Regulator PC Board Layout Checklist
Figure 9: 3.3V Step-Down Regulator
When laying out the printed circuit board, the following checklist should be used to ensure proper operation of the AME5258. These items are also illustrated graphically in Figures 10 and Figures 11 . Check the following in your layout: 1. The power traces, consisting of the GND trace, the SW trace and the V IN trace should be kept short, direct and wide. 2. Does the V FB pin connect directly to the feedback resistors? The resistive divider R1/R2 must be connected between the (+) plate of COUT and ground. 3. Does the (+) plate of CIN connect to V IN as closely as possible? This capacitor provides the AC current to the internal power MOSFETs. 4. Keep the switching node, SW, away from the sensitive VFB node. 5. Keep the (-) plates of CIN and COUT as close as possible.
VIN
L1 IN SW CFWD VOUT
VIN
L1 IN SW
VOUT
AME5258
EN FB
+
COUT
AME5258
EN
+
COUT
R2
V OUT
GND
-
+
CIN
GND R1
+
CIN
-
-
Figure 10: AME5258 Adjustable Voltage Regulator Layout Diagram
Rev.A.05
Figure 11: AME5258 Fixed Voltage Regulator Layout Diagram
11
AME
AME5258
Start-UP form Shutdown
1.5MHz, 600mA Synchronous Buck Converter
Pluse Skipping Mode
RUN 2V /Div
SW 5V /Div
VOUT 1V/Div
VOUT 10mV/Div
IL 500mA/Div
IL 20mA/Div VIN=3.6V VOUT=1.8V IOUT =50mA 1S/Div
VIN=3.6V VOUT=1.8V ILOAD=600mA
200S/Div
Pluse Skipping Mode
Pluse Skipping Mode
SW 5V/Div
SW 5V/Div
VOUT 10mV/Div IL 20mA/Div
VOUT 10mV/Div IL 20mA/Div
VIN=3.6V VOUT=1.8V IOUT=10mA
1S/Div
VIN=3.6V VOUT=1.8V IOUT=20mA
1S/Div
Load Step
100 95
Efficiency vs Input voltage
IOUT=100mA IOUT=200mA
Efficiency(%)
VOUT 100mV/Div AC COUPLED
90 85 80 75 70 65
IL 500mA/Div
IOUT =600mA
IOUT =10mA
IOUT 500mA/Div 20S/Div VIN=3.6V VOUT=1.8V ILOAD=0mA to 600mA
60 55 50 2.5 3 3.5 4 4.5 5 5.5
Input Voltage(V)
12
Rev.A.05
AME
AME5258
Oscillator Frequency VS Temperature
2.0 1.9 1.8 1.7 1.6 1.5 1.4 1.3 1.2 -50
1.5MHz, 600mA Synchronous Buck Converter
Oscillator Frequency VS Supply Voltage
2.0 1.9 1.8
Frequency(MHz)
-25 0 +25 +50
o
Frequency(MHz)
1.7 1.6 1.5 1.4 1.3 1.2
+75
+100
+125
1.1 2.5
3.5
4.5
5.5
Temperature( C)
Supply Voltage (V)
VFB vs Temperature
0.615 0.612
RDS(ON) vs Input voltage
0.7 0.6
0.609
Main Switch
VFB(V)
0.603 0.600 0.597 0.594 0.591 0.588 0.585 -50 -25 0 +25 +50
o
RDS(ON) (m)
0.606
0.5 0.4
0.3 0.2
Synchronous Switch
0.1 0 2.5
+75
+100
+125
3.5
4.5
5.5
6.5
Temperature( C)
Input Voltage(V)
RDS(ON) vs Temperature
0.80 0.75 0.70 0.65 VIN=3.6V VIN =4.2V VIN =2.7V
Efficiency vs Load Current
100 90 80 V IN =2.7V
RDS(ON) (m)
Efficiency(%)
0.60 0.55 0.50 0.45 0.40 0.35 0.30 0.25 0.20 -50 -25 0 +25 +50 +75 +100 +125
70 60 50 40 V IN =3.3V V IN =4.2V
Main Switch Synchronous Switch
30 20 1
V OUT=1.2V
10 100 1000
Temperature( oC)
I OUT (mA)
13
Rev.A.05
AME
AME5258
Efficiency vs Load Current
100 90 V IN =2.7V 80
1.5MHz, 600mA Synchronous Buck Converter
Efficiency vs Load Current
95 90 85 VIN =2.7V
Efficiency(%)
Efficiency(%)
70 60 50 40 VIN=3.3V
80 75 70 V IN =4.2V 65 60
V IN =3.6V
V IN =4.2V
30 20 1
VOUT =1.5V
10 100 1000
55 50 1 10 100
VOUT =1.8V
1000
IOUT (mA)
IOUT (mA)
Efficiency vs Load Current
100 95 90 VIN=2. 7V
Output Voltage vs Load Current
1.844 1.834 1.824
Efficiency(%)
85
VOUT (V)
VOUT =2.5V
1000
80 75 70 65 60 55 50 1 10 100 V IN =3.6V V IN =4.2V
1.814 1.804 1.794 1.784 1.774 0 100 200 300 400 500 600 700 800 900
IOUT (mA)
I OUT (mA)
Current Limit vs Input Voltage
1800 1700
Current Limit (A)
1600 1500 1400 1300 1200 1100 1000 2.5
3.0
3. 5
4.0
Temperature ( C)
4.5 o
5. 0
5.5
14
Rev.A.05
AME
AME5258
n Date Code Rule
Month Code 1: January 7: July 2: February 8: August 3: March 9: September 4: April A: October 5: May B: November 6: June C: December
1.5MHz, 600mA Synchronous Buck Converter
A A A A A A A A A A
A A A A A A A A A A
Marking A M A M A M A M A M A M A M A M A M A M
X X X X X X X X X X
X X X X X X X X X X
Year xxx0 xxx1 xxx2 xxx3 xxx4 xxx5 xxx6 xxx7 xxx8 xxx9
n Tape and Reel Dimension
SOT-25
P
W AME PIN 1 AME
Carrier Tape, Number of Components Per Reel and Reel Size Package SOT-25 Carrier Width (W) 8.00.1 mm Pitch (P) 4.00.1 mm Part Per Full Reel 3000pcs Reel Size 1801 mm
Rev.A.05
15
AME
AME5258
n Package Dimension
SOT-25
Top View D c 1 Side View
1.5MHz, 600mA Synchronous Buck Converter
SYMBOLS A A1 b D E e H L 1 S1
A L
MILLIMETERS MIN
0.90 0.00 0.30 2.70 1.40
INCHES MIN
0.0354 0.0000 0.0118 0.1063 0.0551
MAX
1.30 0.15 0.55 3.10 1.80
MAX
0.0512 0.0059 0.0217 0.1220 0.0709
H
E
1.90 BSC 2.60 3.00
0.07480 BSC 0.10236 0.11811 0.0146BSC
o
PIN1
S1 e Front View
0.37BSC 0
o
10
0
o
10
o
0.95BSC
0.0374BSC
b
16
A1
Rev.A.05
www.ame.com.tw
E-Mail: sales@ame.com.tw
Life Support Policy: These products of AME, Inc. are not authorized for use as critical components in life-support devices or systems, without the express written approval of the president of AME, Inc. AME, Inc. reserves the right to make changes in the circuitry and specifications of its devices and advises its customers to obtain the latest version of relevant information. (c) AME, Inc. , February 2009 Document: 1265-DS5258-A.05
Corporate Headquarter
AME, Inc.
2F, 302 Rui-Guang Road, Nei-Hu District Taipei 114, Taiwan. Tel: 886 2 2627-8687 Fax: 886 2 2659-2989

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