RT9703 80mΩ Ω, 3A Smart Universal Power Switch with Flag General Description The RT9703 is a low voltage, high performance single N-MOSFET power switch, designed for power rail on/off control with low RDS(ON) ≈ 80mΩ and full protection functions. The RT9703 equipped with a charge pump circuitry to drive the internal MOSFET switch and a flag output is available to indicate fault conditions against large di/dt which may cause the supply to fall out of regulation. In order to fit different application, an IP pin is offered for current limit point setting, a resistor from IP to ground sets the current limit for the switch. Features z z z z z z z Additional features include soft-start to limit inrush current during plug-in, thermal shutdown to prevent catastrophic z switch failure from high-current loads, under-voltage lockout (UVLO) to ensure that the device remains off unless there is a valid input voltage present, a precision resistor-programmable output current limit up to 3.5A. Besides, the lower quiescent current as 30μA making this device ideal for portable battery-operated equipment. z The RT9703 is available in SOP-8 package requiring minimum board space and smallest components. z z z z Applications z z z Ordering Information z RT9703 z Package Type S : SOP-8 Lead Plating System P : Pb Free G : Green (Halogen Free and Pb Free) Adjustable Current Limiting up to 3.5A Ω) N-MOSFET Built-In (Typically 80mΩ Reverse Current Flow Blocking (no body diode) i.e. Output Can Be Forced Higher than Input (Off-State) Low Supply Current : ` 30μ μA Typical at Switch on State μA Typical at Switch Off State ` Less than 1μ Guaranteed 3A Continuous Load Current Wide Input Voltage Ranges : 2V to 5.5V Open-Drain Fault Flag Output Hot Plug-In Application (Soft-Start) 1.7V Typical Under-Voltage Lockout (UVLO) Thermal Shutdown Protection Smallest SOP-8 Package Minimizes Board Space RoHS Compliant and 100% Lead (Pb)-Free z z z LCD Monitor, LCD-TV USB Power Module for ADSL Information Appliance and Set-Top Box Battery-Powered Equipment Hot-Plug Power Supplies ACPI Power Distribution PCI Bus Power Switching Motherboard & Notebook PCs PC Card Hot Swap Application Pin Configurations Note : (TOP VIEW) Richtek products are : ` ` RoHS compliant and compatible with the current require- FLG 8 IP ments of IPC/JEDEC J-STD-020. VOUT 2 7 VIN Suitable for use in SnPb or Pb-free soldering processes. VOUT 3 6 VIN GND 4 5 EN SOP-8 DS9703-09 April 2011 www.richtek.com 1 RT9703 Typical Application Circuit Pull-Up Resistor (10K to 100K) Supply Voltage VIN RSET IP 10µF RT9703 EN VOUT GND + Chip Enable Fault Flag FLG Peripheral 33µF Functional Pin Description Pin Name Pin Function VIN Power Input Voltage. VOUT Output Voltage. GND Ground. EN Chip Enable (Active High). FLG Open-Drain Fault Flag Output. IP Current Limit Programming Input. Function Block Diagram EN Bias + Oscillator Charge Pump Thermal Protection IP - UVLO - + VIN VREF Gate Control Output Voltage Detection VOUT FLG Delay www.richtek.com 2 DS9703-09 April 2011 RT9703 Test Circuits 1 2 RFG ISUPPLY VIN VIN + A CIN FLG S1 RT9703 GND A IP VIN A FLG VOUT Chip Enable RL COUT RSET ILEAKAGE RT9703 VOUT + EN CIN VIN IOUT VOUT Chip Enable VFLG + ISUPPLY EN IL 3 A RL GND IP RSET 4 RFG VRDS(ON) V IOUT VIN + CIN VIN COUT RT9703 GND COUT RT9703 FLG EN VFLG FLG VOUT + CIN + + VIN VOUT VIN RL VOUT IL EN IP GND VCE RSET IP RSET 5 S2 + VIN FLG RT9703 IOUT VOUT + VIN CIN COUT EN VOUT A S3 RL IL GND IP RSET Note: Above test circuits reflected the graphs shown on “ Typical Operating Characteristics” are as follows: 1–Turn-On Rising & Turn-Off Falling Time vs. Temperature, Turn-On & Off Response, Flag Response at Chip Enable, Flag Response (Enable into Current Limit) 2–On-State & Off-State Supply Current vs. Input Voltage/Temperature, Turn-Off Leakage Current vs. Temperature 3–On-Resistance vs. Input Voltage/Temperature 4–EN Threshold Voltage vs. Input Voltage/Temperature, Flag Delay Time vs. Input Voltage/Temperature, UVLO Threshold vs. Temperature, UVLO at Rising & Falling 5–Current Limit vs. Input Voltage/Temperature/RSET, Current Limit Factor vs. RSET, Short Circuit Current vs. Input Voltage, Inrush Current Response, Soft-Start Response, Current-Limit & Short Circuit with Thermal Shutdown, Short-Circuit Response DS9703-09 April 2011 www.richtek.com 3 RT9703 Absolute Maximum Ratings z z z z z z z z z (Note 1) Supply Voltage ------------------------------------------------------------------------------------------------------Chip Enable Input Voltage ----------------------------------------------------------------------------------------Flag Voltage ----------------------------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25°C SOP-8 -----------------------------------------------------------------------------------------------------------------Package Thermal Resistance SOP-8, θJA -----------------------------------------------------------------------------------------------------------Junction Temperature ----------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------Storage Temperature Range --------------------------------------------------------------------------------------ESD Susceptibility (Note 2) HBM (Human Body Mode) ----------------------------------------------------------------------------------------MM (Machine Mode) ------------------------------------------------------------------------------------------------ Recommended Operating Conditions z z z 6.5V −0.3V to 6.5V 6.5V 0.95W 104°C/W 125°C 260°C −65°C to 150°°C 8kV 800V (Note 3) Supply Input Voltage ------------------------------------------------------------------------------------------------ 2V to 5.5V Chip Enable Input Voltage ----------------------------------------------------------------------------------------- 0V to 5.5V Junction Temperature Range -------------------------------------------------------------------------------------- −20°C to 100°C Electrical Characteristics (VIN = 5V, CIN = COUT = 1μF, TA = 25°C, unless otherwise specified) Parameter Switch On Resistance Supply Current Symbol Test Conditions Min Typ Max Unit mΩ RDS(ON) IOUT = 3A (Note 8) -- 80 100 ISW_ON Switch On, VOUT = Open -- 30 50 ISW_OFF Switch Off, VOUT = Open -- 0.1 1 μA CE Threshold Logic-Low Voltage VIL (Note 7) Logic-High Voltage VIH Switch Off -- -- 0.8 V Switch On 2.0 -- -- V CE Input Current ICE VCE = 0V to 5.5V -- 0 -- μA Output Leakage Current ILEAKAGE VCE = 0V, RLOAD = 0Ω -- 0.5 10 μA Output Turn-On Rise Time TON_RISE 10% to 90% of VOUT rising -- 1.5 -- ms ILIM x RSET -- 210k -- AΩ VIN = 3.3V to 5.5V, RSET = 60kΩ -- -- 3.5 A −20 -- +20 % -- 15 400 Ω Current Limit Factor (Note 5) Max. Current Limit Setting (Note 6) ILIMSET Current Limit Setting Accuracy ΔI LIMSET I LIMSET = 0.5A to 3A (RSET = 420kΩ to 70kΩ) FLAG Output Resistance RFLG ISINK = 1mA FLAG Off Current IFLG_OFF VFLG = 5V -- 0.01 1 μA FLAG Delay Time (Note 4) tD 2 4.6 8 ms Under-Voltage Lockout VUVLO VIN increasing 1.3 1.7 -- V Under-Voltage Hysteresis ΔVUVLO VIN decreasing -- 0.1 -- V www.richtek.com 4 Form fault condition to FLG assertion DS9703-09 April 2011 RT9703 Parameter Symbol Test Conditions Min Typ Max Unit Thermal Shutdown Protection TSD -- 130 -- °C Thermal Shutdown Hysteresis ΔTSD -- 10 -- °C Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. Note 2. Devices are ESD sensitive. Handling precaution recommended. Note 3. The device is not guaranteed to function outside its operating conditions. Note 4. The FLAG delay time is input voltage dependent, see “ Typical Operating Characteristics” graph for further details. Note 5. Current limit is determined by: ILIMIT = 210k/RSET, where RSET is in ohms. Note 6. It is important to note that the maximum current limit value shall be set properly in accordance with its supply voltage otherwise which it may result in the failure occurrence. See “ Maximum Current Limit vs. Supply Voltage” graph shown on the applications information section for further details. Note 7. For input voltage lower than 5V, the threshold level will subject to ±0.6V deviation throughout the operating junction temperature range. Refer to the “ Typical Operating Characteristics” graph for further details. Note 8. RDS(ON) is measured at constant junction temperature by using a 1ms current pulse. DS9703-09 April 2011 www.richtek.com 5 RT9703 Typical Operating Characteristics 2 On-State Supply Current vs. Input Voltage 50 VEN = 5V 1.5 Supply Current (uA) A CIN = 10μF RL = Open 40 Off-State Supply Current vs. Input Voltage 2 VEN = 5V 45 Supply Current (uA) A 2 RSET = 100kΩ 35 30 25 20 CIN = 10μF COUT = 33μF 1 RL = Open 0.5 0 -0.5 -1 -1.5 15 -2 10 1.5 2 2.5 3 3.5 4 4.5 5 1.5 5.5 2 2.5 On-State Supply Current vs. Temperature 50 COUT = 33μF RL = Open 35 RSET = 100kΩ 30 25 20 15 5 5.5 CIN = 10μF COUT = 33μF 1 RL = Open 0.5 RSET = 100kΩ 0 -0.5 -1 -1.5 10 -2 -40 -20 0 20 40 60 80 100 120 -40 Temperature (° C) 5 -20 0 20 5 60 80 100 120 Current Limit vs. Temperature 2.1 CIN = 10μF, COUT = 33μF VIN = 5V CIN = 10μF, COUT = 33μF RL = 0.5Ω, RSET = 116kΩ 2 40 Temperature (° C) Current Limit vs. Input Voltage 2.1 2 S2 = ON, S3 = OFF Current Limit (A) Current Limit (A) 4.5 VIN = 5V, VEN = 0V 1.5 CIN = 10μF 40 4 Off-State Supply Current vs. Temperature 2 Supply Current (uA) A Supply Current (uA) A 2 VIN = VEN = 5V 45 3.5 Input Voltage (V) Input Voltage (V) 2 3 1.9 1.8 1.7 RL = 0.5Ω , RSET = 116kΩ S2 = ON, S3 = OFF 1.9 1.8 1.7 1.6 1.6 2 2.5 3 3.5 4 Input Voltage (V) www.richtek.com 6 4.5 5 5.5 -40 -20 0 20 40 60 80 100 120 Temperature (° C) DS9703-09 April 2011 RT9703 3 5 Current Limit vs. RSET 4 VIN = 5V, RL = 0.5Ω 3.5 On-Resistance (mΩ) S2 = ON, S3 = OFF 2.5 2 1.5 1 IOUT = 0.5A, RSET = 50kΩ 69 CIN = 10μF, COUT = 33μF 3 Current Limit (A) On-Resistance vs. Input Voltage 70 0.5 CIN = 10μF, COUT = 33μF 68 67 66 65 64 63 0 62 50 100 150 200 250 300 350 400 450 500 2 2.5 3 RSET (k Ω) 3 On-Resistance vs. Temperature 88 5 4 4.5 5 5.5 Short Circuit Current Response IOUT = 0.5A, RSET = 50kΩ VIN = 5V, CIN = 10μF, COUT = 0.1μF RSET = 175kΩ, S2 = S3 = ON CIN = 10μF, COUT = 33μF On-Resistance (mΩ) 3.5 Input Voltage (V) VIN = 5V 78 VOUT (5V/Div) 68 58 IOUT (0.5A/Div) 48 -40 -20 0 20 40 60 80 100 Time (10ms/Div) 120 Temperature (° C) Inrush Current Response COUT = 1000μF COUT = 470μF COUT = 1μF (1A/Div) VIN = 5V, CIN = 10μF RL = 0.5Ω, RSET = 175kΩ, S2 = ON, S3 = OFF EN Pin Threshold vs.Voltage Input CE Threshold VoltageVoltage vs. Input 4 2.4 EN Pin Threshold Voltage (V) EN CE Threshold Voltage (V) 5 CIN = 10μF, COUT = 33μF IL = 100mA, RSET = 100kΩ 2 1.6 1.2 0.8 0.4 0 Time (5ms/Div) 2 2.5 3 3.5 4 4.5 5 5.5 Input Voltage (V) DS9703-09 April 2011 www.richtek.com 7 RT9703 CE Threshold Voltage vs. Temperature EN Pin Threshold Voltage vs. 4 Turn-On Rising Time vs. Temperature 1 4 VIN = 5V, IL = 100mV CIN = 10μF, COUT = 33μF 2 Turn-On Rising Time (ms) ENCE PinThresold Threshold Voltage Voltage (V)(V) 2.4 RSET = 100kΩ 1.6 1.2 0.8 0.4 VIN = VEN = 5V 3.5 CIN = 10μF, COUT = 1μF RL = 30Ω, RSET = 200kΩ 3 S1 = ON 2.5 2 1.5 1 0.5 0 0 -40 -20 0 20 40 60 80 100 120 -40 -20 0 Turn-Off Falling Time vs. Temperature 6 CIN = 10μF, COUT = 1μF RL = 30Ω, RSET = 200kΩ S1 = ON 4 3 2 1 60 80 100 120 0.2 VIN = 5V, VEN = 0V CIN = 10μF, COUT = 33μF RL = 0Ω, RSET = 100kΩ 0.1 0 -0.1 -0.2 -0.3 0 -40 -20 0 20 40 60 80 100 -40 120 -20 0 4 4 Flag Dealy Time vs. Input Voltage 10 40 60 80 100 120 Flag Delay Time vs. Temperature 9 VEN = 5V CIN = 10μF, COUT = 33μF 8 20 Temperature (° C) Temperature (° C) VIN = VEN = 5V CIN = 10μF, COUT = 33μF RL = 0.5Ω, RSET = 100kΩ Flag Delay Time (ms) Flag Delay Time (ms) 40 Turn-Off Leakage Current vs. Temperature 0.3 VIN = 5V, VEN = 0V 5 2 Turn-Off Leakage Current (uA) a Turn-Off Falling Time (us) 1 20 Temperature (° C) Temperature (° C) RFG = 1kΩ 6 4 2 0 8 RL = 0.5Ω, RSET = 100kΩ RFG = 1kΩ 7 6 5 4 2 2.5 3 3.5 4 Input Voltage (V) www.richtek.com 8 4.5 5 5.5 -40 -20 0 20 40 60 80 100 120 Temperature (° C) DS9703-09 April 2011 RT9703 4 3 UVLO Threshold (V) 1 UVLO Threshold vs. Temperature 3.5 Turn-On Response CIN = 10μF, COUT = 33μF RL = 1kΩ, RSET = 100kΩ 2.5 VEN (5V/Div) 2 1.5 1 VIN = 5V, S1 = ON 0.5 CIN = 10μF, COUT = 1μF VOUT (1V/ 0 -40 -20 0 20 40 60 80 100 RL = 33Ω, RSET = 200kΩ Time (250μs/Div) 120 Temperature (° C) 1 Turn-Off Response 4 UVLO at Rising VIN = 5V, S1 = OFF CIN = 10μF, COUT = 1μF RL = 30Ω, RSET = 200kΩ VEN (5V/Div) VOUT (5V/Div) VIN (1V/Div) VOUT (1V/Div) IL (100mA/Div) CIN = 1000μF, COUT = 1μF Time (1ms/Div) Time (100μs/Div) 4 VIN = VEN = 5V 1 UVLO at Falling FLAG Response when Enable into Current Limit VIN = VEN = 5V CIN = 1000μF, COUT = 1μF RL = 30Ω, RSET = 200kΩ VEN (5V/Div) VFLG (5V/Div) VIN = 5V VIN (1V/Div) VOUT (1V/Div) Time (25ms/Div) DS9703-09 April 2011 IL (1A/Div) CIN = 1μF, COUT = 33μF RL = 0.5Ω, RSET = 175kΩ Time (1ms/Div) www.richtek.com 9 RT9703 1 FLAG Response at Chip Enable 5 Current Limit with Thermal Shutdown VIN = 5V CIN = 10μF RL = 0.5Ω, RSET = 116kΩ S2 = ON, S3 = OFF COUT = 33μF VEN (5V/Div) VFLG (5V/Div) VEN (5V/Div) VIN = 5V IL (0.5A/Div) CIN = 1μF, COUT = 33μF RL = 0.5Ω, RSET = 420kΩ IL (1A/Div) Time (50ms/Div) Time (10ms/Div) 5 Short- Circuit with Thermal Shutdown 5 Soft-Start Response with Current Limit VIN = 5V, CIN = 10μF, COUT = 33μF RSET = 140kΩ, S2 = ON, S3 = ON VIN (5V/Div) VTRIGGER (5V/Div) VEN (5V/Div) VOUT (5V/Div) CIN = 10μF, COUT = 1μF IL (2A/Div) IL (0.5A/Div) Time (10ms/Div) www.richtek.com 10 RL = 0.5Ω, RSET = 70kΩ Time (1ms/Div) DS9703-09 April 2011 RT9703 Applications Information The RT9703 is a high-side, N-Channel, power switch ≈ available with active high enable input. Low RDS(ON)dd 80mΩ and full protection functions make it optimized to replace complex discrete on/off control circuitry. Input and Output VIN (input) is the power source connection to the internal circuitry and the drain of the MOSFET. VOUT (output) is the source of the MOSFET. In a typical application, current flows through the switch from VIN to VOUT toward the load. If VOUT is greater than VIN, current will flow from VOUT to VIN since the MOSFET is bidirectional when on. Unlike a normal MOSFET, there is no a parasitic body diode between drain and source of the MOSFET, the RT9703 prevents reverse current flow if VOUT being externally forced to a higher voltage than VIN when the output disabled (VEN < 0.8V). D S S D Fault Flag The RT9703 provides a FLG signal pin which is an N-Channel open drain MOSFET output. This open drain output goes low when VOUT < VIN −1V, current limit or the die temperature exceeds 130°C approximately. The FLG output is capable of sinking a 10mA load to typically 150mV above ground. The FLG pin requires a pull-up resistor, this resistor should be large in value to reduce energy drain. A 100kΩ pull-up resistor works well for most applications. In the case of an over-current condition, FLG will be asserted only after the flag response delay time, tD, has elapsed. This ensures that FLG is asserted only upon valid over-current conditions and that erroneous error reporting is eliminated. For example, false over-current conditions may occur during hot-plug events when a highly large capacitive load is connected and causes a high transient inrush current that exceeds the current limit threshold. The FLG response delay time tD is typically 4.6ms. Under-voltage Lockout G Normal MOSFET G RT9703 Chip Enable Input The switch will be disabled when the EN pin is in a logic low condition. During this condition, the internal circuitry and MOSFET are turned off, reducing the supply current to 0.1μA typically. The maximum guaranteed voltage for a logic low at the EN pin is 0.8V. A minimum guaranteed voltage of 2V at the EN pin will turn the RT9703 back on. Floating the input may cause unpredictable operation. EN should not be allowed to go negative with respect to GND. The EN pin may be directly tied to VIN to keep the part on. Under-voltage lockout (UVLO) prevents the MOSFET switch from turning on until input voltage exceeds approximately 1.7V. If input voltage drops below approximately 1.3V, UVLO turns off the MOSFET switch, FLG will be asserted accordingly. Under- voltage detection functions only when the chip enable input is enabled. Current Limiting and Short-Circuit Protection The current limit circuitry prevents damage to the MOSFET switch and external load. It is user adjust- able with an external set resistor, RSET, ILIMIT = 210kΩ/RSET in the range of 0.5A to 3A. The accuracy of current limit set point may vary with operating temperature and supply voltage. See “Typical Operating Characteristics” graph for further details. Soft-Start for Hot Plug-In Applications In order to eliminate the upstream voltage droop caused by the large inrush current during hot-plug events, the “soft-start” feature effectively isolates the power source from extremely large capacitive loads. DS9703-09 April 2011 www.richtek.com 11 RT9703 The normal current limit value, ILIMIT, is set with an external resistor between IP (pin 8) and GND (pin 4). When a heavy load or short circuit is applied to an enabled switch, a large transient current may flow until the current limit circuitry responds. Once this current limit threshold is exceeded, the device enters constant current mode until the thermal shutdown occurred or the fault is removed. It is important to note that the maximum current limit value shall be set properly in accordance with its supply voltage otherwise it may result in the failure occurrence. The graph below shows the maximum current limit and supply voltage on the safe operation area. Maximun Current Limit vs. Supply Voltage Maximun Current Limit (A) A 5 TA = 25°C the junction temperature does not exceed 100°C. With all possible conditions, the junction temperature must be within the range specified under operating conditions. Power dissipation can be calculated based on the output current and the RDS(ON) of switch as below. PD = RDS(ON) x IOUT2 Although the devices are rated for 3A of output current, but the application may limit the amount of output current based on the total power dissipation and the ambient temperature. The final operating junction temperature for any set of conditions can be estimated by the following thermal equation : PD(MAX) = ( TJ(MAX) - TA ) / θJA Where TJ(MAX) is the maximum junction temperature of the die (100°C) and TA is the maximum ambient temperature. The junction to ambient thermal resistance (θJA) for SOP8 package at recommended minimum footprint is 104°C/ W (θJA is layout dependent). 4.5 4 3.5 3 2.5 2 Supply Filter/Bypass Capacitor 1.5 1 0.5 0 2 2.5 3 3.5 4 4.5 5 5.5 Supply Voltage (V) Thermal Shutdown Thermal shutdown is employed to protect the device from damage if the die temperature exceeds approximately 130°C. If enabled, the switch automatically restarts when the die temperature falls 10°C. The output and FLG signal will continue to cycle on and off until the device is disabled or the fault is removed. Power Dissipation The device's junction temperature depends on several factors such as the load, PCB layout, ambient temperature and package type. The output pin of RT9703 can deliver a current of up to 3A over the full operating junction temperature range. However, the maximum output current must be derated at higher ambient temperature to ensure www.richtek.com 12 A 10μF low-ESR ceramic capacitor from VIN to GND (the amount of the capacitance may be increased without limit), located at the device is strongly recommended to prevent the input voltage drooping during hot-plug events. However, higher capacitor values will further reduce the voltage droop on the input. Furthermore, without the bypass capacitor, an output short may cause sufficient ringing on the input (from source lead inductance) to destroy the internal control circuitry. An important note to be award of is the parasitic inductance of PCB traces can cause over-voltage transients if the PCB trace has even a few tens of nH of inductance. It is recommended to use aluminum electrolytic acted the supply capacitor to prevent the device from being damaged. The input transient MUST not exceed 6.5V of the absolute maximum supply voltage even for a short duration. DS9703-09 April 2011 RT9703 Fault Flag Filtering (Optional) The transient inrush current to downstream capacitance may cause a short-duration error flag, which may cause erroneous over-current reporting. A simple 1ms RC lowpass filter (10kΩ and 0.1μF) in the flag line eliminates short-duration transients. GND VIN IP EN PCB Layout In order to meet the voltage drop, droop, and EMI requirements, careful PCB layout is necessary. The following guidelines must be considered: z z z z Keep all input and output traces as short as possible and use at least 150-mil & 2 ounce copper for all races. GND FLG VOUT Avoid vias as much as possible. If vias are necessary, make them as large as feasible. Place a ground plane under all circuitry to lower both resistance and inductance and improve DC and transient performance (Use a separate ground and power plans if possible). GND Board Layout Locate the bypass capacitors as close as possible to the input and output pin of the RT9703. DS9703-09 April 2011 www.richtek.com 13 RT9703 Outline Dimension H A M J B F C I D Dimensions In Millimeters Dimensions In Inches Symbol Min Max Min Max A 4.801 5.004 0.189 0.197 B 3.810 3.988 0.150 0.157 C 1.346 1.753 0.053 0.069 D 0.330 0.508 0.013 0.020 F 1.194 1.346 0.047 0.053 H 0.170 0.254 0.007 0.010 I 0.050 0.254 0.002 0.010 J 5.791 6.200 0.228 0.244 M 0.400 1.270 0.016 0.050 8-Lead SOP Plastic Package Richtek Technology Corporation Richtek Technology Corporation Headquarter Taipei Office (Marketing) 5F, No. 20, Taiyuen Street, Chupei City 5F, No. 95, Minchiuan Road, Hsintien City Hsinchu, Taiwan, R.O.C. Taipei County, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Tel: (8862)86672399 Fax: (8862)86672377 Email: [email protected] Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit design, specification or other related things if necessary without notice at any time. No third party intellectual property infringement of the applications should be guaranteed by users when integrating Richtek products into any application. No legal responsibility for any said applications is assumed by Richtek. www.richtek.com 14 DS9703-09 April 2011