Data Sheet 1.5MHz, 2A, STEP DOWN DC-DC CONVERTER General Description Features The AUR9719 is a high efficiency step-down DC-DC voltage converter. The chip operation is optimized by peak-current mode architecture with built-in synchronous power MOS switchers. The oscillator and timing capacitors are all built-in providing an internal switching frequency of 1.5MHz that allows the use of small surface mount inductors and capacitors for portable product implementations. • • • • • • • • • • • Integrated Soft Start (SS), Under Voltage Lock Out (UVLO), Thermal Shutdown Detection (TSD) and Short Circuit Protection are designed to provide reliable product applications. AUR9719 High Efficiency Buck Power Converter Output Current: 2A Low RDS(ON) Internal Switch: 100mΩ Adjustable Output Voltage from 0.8V to 9×VIN Wide Operating Voltage Range: 2.7V to 5.5V Built-in Power Switches for Synchronous Rectification with High Efficiency 800mV Feedback Voltage 1.5MHz Constant Frequency Operation Thermal Shutdown Protection Low Drop-out Operation at 90% Duty Cycle No Schottky Diode Required Applications The device is available in adjustable output voltage versions ranging from 0.8V to 9×VIN when input voltage range is from 2.7V to 5.5V , and is able to deliver up to 2.0A. • • • • The AUR9719 is available in DFN-3×3-6 package. LCD TV Set Top Box Post DC-DC Voltage Regulation PDA and Notebook Computers DFN-3×3-6 Figure 1. Package Type of AUR9719 Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 1 Data Sheet 1.5MHz, 2A, STEP DOWN DC-DC CONVERTER AUR9719 Pin Configuration D Package (DFN-3×3-6) Pin 1 Mark 1 2 6 Exposed Pad 3 5 4 Figure 2. Pin Configuration of AUR9719 (Top View) Pin Description Pin Number Pin Name I/O 1 FB INPUT 2 GND GROUND Ground pin 3 SW OUTPUT Switch output pin 4 VIN_SW INPUT Power supply input for the MOSFET switch 5 VIN_A INPUT Supply input for the analog circuit 6 EN INPUT Enable pin. Active high Nov. 2011 Function Output voltage feedback pin Rev. 1. 0 BCD Semiconductor Manufacturing Limited 2 Data Sheet 1.5MHz, 2A, STEP DOWN DC-DC CONVERTER AUR9719 Functional Block Diagram VIN_A EN 5 6 Saw-tooth Generator Bias Generator Current Sensing + 1 + - Control Logic - + Error Amplifier Bandgap Reference Buffer & Dead Time Control Logic 3 SW Modulator + + 4 Over Current Comparator Oscillator Soft Start FB VIN_SW Reverse Inductor Current Comparator Over Voltage Comparator 2 GND Figure 3. Functional Block Diagram of AUR9719 Ordering Information AUR9719 A Package D: DFN-3×3-6 G: Green Circuit Type A: Adjustable Output 5 Package Temperature Range DFN-3×3-6 -40 to 80°C Part Number AUR9719AGD Marking ID 9719A Packing Type Tape & Reel BCD Semiconductor's Pb-free products, as designated with "G" in the part number, are RoHS compliant and green. Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 3 Data Sheet 1.5MHz, 2A, STEP DOWN DC-DC CONVERTER AUR9719 Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit Supply Input Voltage (VIN_SW) VIN_SW 0 to 6.0 V Supply Input Voltage (VIN_A) VIN_A 0 to 6.0 V VIN(SW_A) -0.3 to 0.3 -0.3 to VIN_SW+0.3 V A Voltage from VIN_SW to VIN_A Pin SW Pin Switch Voltage VSW SW Pin Switch Current ISW Enable Voltage VEN 3.2 -0.3 to VIN_A+0.3 Power Dissipation (On PCB, TA=25°C) PD 2.49 W Thermal Resistance (Junction to Ambient, Simulation) θJA 40.11 °C/W Operating Junction Temperature TJ 150 °C Operating Temperature TOP -40 to 85 °C Storage Temperature TSTG -55 to 150 °C ESD (Human Body Model) VHBM 2000 V ESD (Machine Model) VMM 200 V V V Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” 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 under “Recommended Operating Conditions” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability. Recommended Operating Conditions Parameter Symbol Min Max Unit Supply Input Voltage VIN 2.7 5.5 V Junction Temperature Range TJ -20 125 °C Ambient Temperature Range TA -40 80 °C Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 4 Data Sheet 1.5MHz, 2A, STEP DOWN DC-DC CONVERTER AUR9719 Electrical Characteristics VIN_SW=VIN_A=VEN=5V, VOUT=1.2V, VFB=0.8V, L=3.3µH, CIN=4.7µF, COUT=22µF, TA=25°C, unless otherwise specified. Parameter Symbol Test Condition Input Voltage Range VIN VIN=VIN_SW=VIN_A Shutdown Current IOFF VEN=0V Active Current Regulated Feedback Voltage ION VFB=0.95V VFB For Adjustable Output Voltage Regulated Output Voltage Accuracy Peak Current Inductor Oscillator Frequency ∆VOUT /VOUT Min Typ 2.7 0.784 VIN=2.7V to 5.5V, IOUT=10mA to 2A Max Unit 5.5 V 4 µA 460 µA 0.8 -3 IPK 2.2 3.2 fOSC 1.2 1.5 0.816 V 3 % A 1.8 MHz PMOSFET RON RON(P) ISW=0.75A 100 mΩ NMOSFET RON RON(N) ISW=0.75A 100 mΩ EN Input High Threshold Voltage EN Input Low Threshold Voltage EN Input Current Soft-start Time Maximum Duty Cycle Under Voltage Lock Out Threshold Thermal Shutdown Nov. 2011 1.5 VEN_H V VEN_L 0.4 V IEN 2 µA tSS 450 µs DMAX VUVLO TSD 90 % Rising 2.4 Falling 2.3 Hysteresis 0.1 Hysteresis=30°C 150 Rev. 1. 0 V °C BCD Semiconductor Manufacturing Limited 5 Data Sheet 1.5MHz, 2A, STEP DOWN DC-DC CONVERTER AUR9719 100 100 90 90 80 80 70 70 Efficiency (%) Efficiency (%) Typical Performance Characteristics 60 50 40 VIN=3.3V VIN=4.2V 30 VIN=5.0V 20 VOUT=1.0V 40 VIN=3.3V 30 VIN=4.2V VIN=5.0V VIN=5.5V 10 VOUT=1.2V 0 0 0.0 50 20 VIN=5.5V 10 60 0.5 1.0 1.5 2.0 0.0 0.5 Output Current (A) 1.5 2.0 Figure 5. Efficiency vs. Output Current (VOUT=1.2V) 100 100 90 90 80 80 70 70 Efficiency (%) Efficiency (%) Figure 4. Efficiency vs. Output Current (VOUT=1.0V) 60 50 40 VIN=3.3V 30 VIN=4.2V VIN=5.0V 20 60 50 40 VIN=3.3V 30 VIN=4.2V VIN=5.0V 20 VIN=5.5V 10 1.0 Output Current (A) VIN=5.5V 10 VOUT=1.8V VOUT=2.5V 0 0 0.0 0.5 1.0 1.5 0.0 2.0 Figure 6. Efficiency vs. Output Current (VOUT=1.8V) Nov. 2011 0.5 1.0 1.5 2.0 Output Current (A) Output Current (A) Figure 7. Efficiency vs. Output Current (VOUT=2.5V) Rev. 1. 0 BCD Semiconductor Manufacturing Limited 6 Data Sheet 1.5MHz, 2A, STEP DOWN DC-DC CONVERTER AUR9719 Typical Performance Characteristics (Continued) 100 1.03 90 1.02 80 Output Voltage (V) Efficiency (%) 70 60 50 40 30 VIN=4.2V 20 VIN=5.0V 1.00 VIN=3.3V 0.99 VIN=4.2V VIN=5.0V VIN=5.5V 0.98 VIN=5.5V 10 1.01 VOUT=1.0+0.03V VOUT=3.3V 0 0.97 0.0 0.5 1.0 1.5 2.0 0.0 0.5 Output Current (A) 1.0 1.5 2.0 Output Current (A) Figure 8. Efficiency vs. Output Current (VOUT=3.3V) Figure 9. Load Regulation (VOUT=1.0±0.03V) 1.24 1.85 1.23 1.84 1.83 Output Voltage (V) Output Voltage (V) 1.22 1.21 1.20 1.19 VIN=3.3V VIN=4.2V 1.18 VIN=5.0V VIN=5.5V 1.17 VOUT=1.2+0.03V 1.82 1.81 1.80 1.79 VIN=3.3V 1.78 VIN=4.2V VIN=5.0V 1.77 VIN=5.5V 1.76 1.16 VOUT=1.8+0.03V 1.75 0.0 0.5 1.0 1.5 2.0 Output Current (A) 0.5 1.0 1.5 2.0 Output Current (A) Figure 10. Load Regulation (VOUT=1.2±0.03V) Nov. 2011 0.0 Figure 11. Load Regulation (VOUT=1.8±0.03V) Rev. 1. 0 BCD Semiconductor Manufacturing Limited 7 Data Sheet 1.5MHz, 2A, STEP DOWN DC-DC CONVERTER AUR9719 Typical Performance Characteristics (Continued) 3.40 2.56 3.38 3.36 Output Voltage (V) Output Voltage (V) 2.54 2.52 2.50 2.48 VIN=3.3V VIN=4.2V VIN=5.0V 2.46 VIN=5.5V 3.34 3.32 3.30 3.28 3.26 VIN=4.2V VIN=5.0V 3.24 VIN=5.5V 3.22 VOUT=2.5+0.03V VOUT=3.3+0.03V 3.20 2.44 0.0 0.5 1.0 1.5 0.0 2.0 0.5 Output Current (A) 1.0 1.5 2.0 Output Current (A) Figure 12. Load Regulation (VOUT=2.5±0.03V) Figure 13. Load Regulation (VOUT=3.3±0.03V) 1.24 1.03 1.23 1.02 Output Voltage (V) Output Voltage (V) 1.22 1.01 1.00 0.99 IOUT=0A IOUT=2A VOUT=1.0+0.03V 0.98 1.20 1.19 IOUT = 0A IOUT = 2A 1.18 VOUT=1.2+0.03V O TA= 25 C 1.17 O TA=25 C 1.16 0.97 3.0 3.5 4.0 4.5 5.0 3.0 5.5 3.5 4.0 4.5 5.0 5.5 Input Voltage (V) Input Voltage (V) Figure 14. Line Regulation (VOUT=1.0±0.03V) Nov. 2011 1.21 Figure 15. Line Regulation (VOUT=1.2±0.03V) Rev. 1. 0 BCD Semiconductor Manufacturing Limited 8 Data Sheet 1.5MHz, 2A, STEP DOWN DC-DC CONVERTER AUR9719 Typical Performance Characteristics (Continued) 2.56 1.85 1.84 2.54 1.82 Output Voltage (V) Output Voltage (V) 1.83 1.81 1.80 1.79 IOUT=0A 1.78 IOUT=2A 1.77 VOUT=1.8+0.03V 1.76 TA= 25 C 3.5 4.0 4.5 2.50 2.48 IOUT=0A IOUT=2A 2.46 O 1.75 3.0 2.52 VOUT=2.5+0.03V O TA= 25 C 5.0 2.44 3.5 5.5 4.0 3.40 1.10 3.38 1.05 3.36 1.00 3.34 3.32 3.30 3.28 IOUT = 0A 3.26 IOUT = 2A 3.24 VOUT=3.3+0.03V O TA= 25 C 3.22 3.20 4.5 5.0 5.5 Input Voltage (V) 5.5 0.95 High Level 0.90 0.85 Low Level 0.80 0.75 0.70 VOUT=1.2V 0.65 TA=25 C IOUT=500mA o 0.60 3.0 3.5 4.0 4.5 5.0 5.5 Input Voltage (V) Figure 18. Line Regulation (VOUT=3.3±0.03V) Nov. 2011 5.0 Figure 17. Line Regulation (VOUT=2.5±0.03V) EN Threshold Voltage (V) Output Voltage (V) Figure 16. Line Regulation (VOUT=1.8±0.03V) 4.0 4.5 Input Voltage (V) Input Voltage (V) Figure 19.EN Threshold Voltage vs. Input Voltage Rev. 1. 0 BCD Semiconductor Manufacturing Limited 9 Data Sheet 1.5MHz, 2A, STEP DOWN DC-DC CONVERTER AUR9719 Typical Performance Characteristics (Continued) 1.8 50 1.7 45 VIN=5.0V Temperature ( C) o Frequency (MHz) VOUT=3.3V 1.6 1.5 1.4 VOUT=1.2V IOUT=1A 1.3 VOUT=1.0V 40 35 30 o TA=25 C 1.2 3.0 3.5 4.0 4.5 5.0 25 0.0 5.5 Input Voltage (V) 1.0 1.5 2.0 Output Current (A) Figure 20.Frequency vs. Input Voltage Figure 21.Temperature vs. Output Current Figure 22. Start Up through EN (VIN=5V, VEN=0V to 5V, VOUT=3.3V, IOUT=2.0A) Nov. 2011 0.5 Figure 23. Shut Down through EN (VIN=5V, VEN=5V to 0V, VOUT=3.3V, IOUT=2.0A) Rev. 1. 0 BCD Semiconductor Manufacturing Limited 10 Data Sheet 1.5MHz, 2A, STEP DOWN DC-DC CONVERTER AUR9719 Typical Performance Characteristics (Continued) Figure 24. Output Ripple Voltage (VIN=5.0V, VOUT=1.0V, IOUT=1.0A) Figure 25. Output Ripple Voltage (VIN=5.0V, VOUT =1.0V, IOUT=2.0A) Figure 26. Output Ripple Voltage (VIN=5.0V, VOUT=3.3V, IOUT=1.0A) Nov. 2011 Figure 27. Output Ripple Voltage ( VIN=5.0V, VOUT=3.3V, IOUT=2.0A) Rev. 1. 0 BCD Semiconductor Manufacturing Limited 11 Data Sheet 1.5MHz, 2A, STEP DOWN DC-DC CONVERTER AUR9719 Typical Performance Characteristics (Continued) Figure 28. Load Transition Figure 29. Load Transition (VIN=5.0V, VOUT=1.0V, IOUT =0.1 to 1A) (VIN=5.0V, VOUT=1.0V, IOUT =0.1 to 2A) Figure 30. Load Transition (VIN=5.0V, VOUT=3.3V, IOUT=0.1A to 1.0A) Nov. 2011 Figure 31. Load Transition (VIN=5.0V, VOUT=3.3V, IOUT=0.1A to 2.0A) Rev. 1. 0 BCD Semiconductor Manufacturing Limited 12 Data Sheet 1.5MHz, 2A, STEP DOWN DC-DC CONVERTER AUR9719 Typical Performance Characteristics (Continued) Figure 32. Short Circuit Protection (VIN=5V, VOUT=3.3V, IOUT=2.0A) Nov. 2011 Figure 33. Short Circuit Recovery (VIN=5V, VOUT=3.3V, IOUT=2.0A) Rev. 1. 0 BCD Semiconductor Manufacturing Limited 13 Data Sheet 1.5MHz, 2A, STEP DOWN DC-DC CONVERTER AUR9719 Application Information deviations do not much relieve. The selection of COUT is determined by the Effective Series Resistance (ESR) that is required to minimize output voltage ripple and load step transients, as well as the amount of bulk capacitor that is necessary to ensure that the control loop is stable. Loop stability can be also checked by viewing the load step transient response as described in the following section. The output ripple, △VOUT, is determined by: The basic AUR9719 application circuit is shown in Figure 36, external components selection is determined by the load current and is critical with the selection of inductor and capacitor values. 1. Inductor Selection For most applications, the value of inductor is chosen based on the required ripple current with the range of 1µH to 6.8µH. ∆VOUT ≤ ∆I L [ ESR + V 1 ∆I L = VOUT (1 − OUT ) f ×L VIN The output ripple is the highest at the maximum input voltage since △IL increases with input voltage. The largest ripple current occurs at the highest input voltage. Having a small ripple current reduces the ESR loss in the output capacitor and improves the efficiency. The highest efficiency is realized at low operating frequency with small ripple current. However, larger value inductors will be required. A reasonable starting point for ripple current setting is △IL=40%IMAX . For a maximum ripple current stays below a specified value, the inductor should be chosen according to the following equation: L =[ 3. Load Transient A switching regulator typically takes several cycles to respond to the load current step. When a load step occurs, VOUT immediately shifts by an amount equal to △ILOAD×ESR, where ESR is the effective series resistance of output capacitor. △ILOAD also begins to charge or discharge COUT generating a feedback error signal used by the regulator to return VOUT to its steady-state value. During the recovery time, VOUT can be monitored for overshoot or ringing that would indicate a stability problem. VOUT VOUT ][1 − ] f × ∆I L ( MAX ) VIN ( MAX ) 4. Output Voltage Setting The DC current rating of the inductor should be at least equal to the maximum output current plus half the highest ripple current to prevent inductor core saturation. For better efficiency, a lower DC-resistance inductor should be selected. The output voltage of AUR9719 can be adjusted by a resistive divider according to the following formula: VOUT = V REF × (1 + 2. Capacitor Selection I RMS = I OMAX VOUT R1 FB 1 2 AUR9719 R2 GND It indicates a maximum value at VIN=2VOUT, where IRMS=IOUT/2. This simple worse-case condition is commonly used for design because even significant Nov. 2011 R1 R ) = 0.8V × (1 + 1 ) R2 R2 The resistive divider senses the fraction of the output voltage as shown in Figure 34. 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 must be used. The maximum RMS capacitor current is given by: [V (V − VOUT )] × OUT IN VIN 1 ] 8 × f × COUT Figure 34. Setting the Output Voltage Rev. 1. 0 BCD Semiconductor Manufacturing Limited 14 Data Sheet 1.5MHz, 2A, STEP DOWN DC-DC CONVERTER AUR9719 Application Information (Continued) When AUR9719 output node is shorted to GND, as VFB drop under 0.4V, chip will enter soft-start to protect itself, when short circuit is removed, and VFB rise over 0.4V, AUR9719 enter normal operation again. If AUR9719 reach OCP threshold while short circuit, AUR9719 will enter soft-start cycle until the current under OCP threshold. 6.2 I2R losses are calculated from internal switch resistance, RSW and external inductor resistance RL. In continuous mode, the average output current flowing through the inductor is chopped between power PMOSFET switch and NMOSFET switch. Then, the series resistance looking into the LX pin is a function of both PMOSFET RDS(ON) and NMOSFET RDS(ON) resistance and the duty cycle (D): 6. Efficiency Considerations RSW = RDS (ON )P × D + RDS (ON ) N × (1 − D ) 5. Short-Circuit Protection The efficiency of switching regulator is equal to the output power divided by the input power times 100%. It is usually useful to analyze the individual losses to determine what is limiting efficiency and which change could produce the largest improvement. Efficiency can be expressed as: Therefore, to obtain the I2R losses, simply add RSW to RL and multiply the result by the square of the average output current. Other losses including CIN and COUT ESR dissipative losses and inductor core losses generally account for less than 2 % of total additional loss. Efficiency=100%-L1-L2-….. 7. Thermal Characteristics Where L1, L2, etc. are the individual losses as a percentage of input power. In most applications, the part does not dissipate much heat due to its high efficiency. However, in some conditions when the part is operating in high ambient temperature with high RDS(ON) resistance and high duty cycles, such as in LDO mode, the heat dissipated may exceed the maximum junction temperature. To avoid the part from exceeding maximum junction temperature, the user should do some thermal analysis. The maximum power dissipation depends on the layout of PCB, the thermal resistance of IC package, the rate of surrounding airflow and the temperature difference between junction and ambient. Although all dissipative elements in the regulator produce losses, two major sources usually account for most of the power losses: VIN quiescent current and I2R losses. The VIN quiescent current loss dominates the efficiency loss at very light load currents and the I2R loss dominates the efficiency loss at medium to heavy load currents. 6.1 The VIN quiescent current loss comprises two parts: the DC bias current as given in the electrical characteristics and the internal MOSFET switch gate charge currents. The gate charge current results from switching the gate capacitance of the internal power MOSFET switches. Each cycle the gate is switched from high to low, then to high again, and the packet of charge, dQ moves from VIN to ground. The resulting dQ/dt is the current out of VIN that is typically larger than the internal DC bias current. In continuous mode, 8. PCB Layout Considerations When laying out the printed circuit board, the following checklist should be used to optimize the performance of AUR9719. 1) The power traces, including the GND trace, the LX trace and the VIN trace should be kept direct, short and wide. 2) Put the input capacitor as close as possible to the VIN and GND pins. 3) The FB pin should be connected directly to the feedback resistor divider. 4) Keep the switching node, LX, away from the sensitive FB pin and the node should be kept small area. I GATE = f × (Q P + Q N ) Where QP and QN are the gate charge of power PMOSFET and NMOSFET switches. Both the DC bias current and gate charge losses are proportional to the VIN and this effect will be more serious at higher input voltages. Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 15 Data Sheet 1.5MHz, 2A, STEP DOWN DC-DC CONVERTER AUR9719 Application Information (Continued) Figure 35. Layout Example of AUR9719 Nov. 2011 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 16 Data Sheet 1.5MHz, 2A, STEP DOWN DC-DC CONVERTER AUR9719 AUR9719 Typical Application Note 2: VOUT = V REF × (1 + R1 ). R2 Figure 36. Typical Application Circuit of AUR9719 Table 1. Component Guide Nov. 2011 VOUT(V) R1 (kΩ) R2 (kΩ) L1 (µH) 3.3 31.25 10 3.3 2.5 21.5 10 3.3 1.8 12.5 10 3.3 1.2 5 10 3.3 1.0 3 10 3.3 Rev. 1. 0 BCD Semiconductor Manufacturing Limited 17 Data Sheet 1.5MHz, 2A, STEP DOWN DC-DC CONVERTER AUR9719 Mechanical Dimensions DFN-3×3-6 Nov. 2011 Rev. 1. 0 Unit:mm(inch) BCD Semiconductor Manufacturing Limited 18 BCD Semiconductor Manufacturing Limited http://www.bcdsemi.com IMPORTANT NOTICE IMPORTANT NOTICE BCD Semiconductor BCD Semiconductor Manufacturing Manufacturing Limited Limited reserves reserves the the right right to to make make changes changes without without further further notice notice to to any any products products or or specifispecifications herein. cations herein. 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