SC4812 Current Mode PWM Controller with Integrated Start-up Circuit and Op Amp POWER MANAGEMENT Description Features The circuitry of the SC4812 includes an integrated high voltage start-up circuit suitable for telecom/industrial voltage applications. It is disabled during regular opera- The SC4812 is a highly integrated current mode PWM controller designed for isolated or non-isolated dc-dc converters in telecommunication and data communication applications. It minimizes the amount of external discrete components needed and leads to substantial cost and space saving converter designs. tion and improves efficiency. Current mode control with leading-edge blanking simplifies control loop design and internal ramp compensation circuit stabilizes the current loop when operating above 50% duty cycle. Internal error amplifier could be used for non-isolated applications. Wide input range 12V to 90V High-voltage start-up circuit Current mode control Transconductance error amplifier Leading-edge blanking Cycle by cycle current limit Programmable external soft-start Thermal shutdown SO-8 package. Fully WEEE and RoHS compliant Applications IP phones, PoE Telecom isolated converters Off-line isolated power supplies Instrumentation power supplies Battery chargers Typical Application Circuit Vin T1 D1 Vout C1 C2 R1 VCC 2 U1 VIN 1 R2 C4 8 C3 FB Q1 OUT 7 SC4812 3 COMP CS 5 C5 4 R3 R4 Revision: February 6, 2007 SS/SHDN GND 6 R5 C6 1 www.semtech.com SC4812 POWER MANAGEMENT Pin Configuration Ordering Information TOP VIEW VIN VCC FB OUT COMP GND SS/SHDN Part Number Top Mark P ackag e SC4812STRT(1)(2) S C 4812 SO-8 S C 4812E V B Evaluation Board Notes: (1) Only available in tape and reel packaging. A reel contains 2500 devices. (2) Lead free product. This product is fully WEEE and RoHS compliant. CS (SO - 8 PIN) Absolute Maximum Ratings Exceeding the specifications below may result in permanent damage to the device, or device malfunction. Operation outside of the parameters specified in the Electrical Characteristics section is not implied. Exposure to Absolute Maximum rated conditions for extended periods of time may affect device reliability. Parameter Symbol Maximum Units Input Voltage VIN -0.5 to 100 V Supply Voltage V CC -0.5 to 18 V Supply Current ICC 20 mA -0.5 to 7 V ±1 A FB, COMP, CS, and SS/SHDN to GND OUT Peak Current Continuous Power Dissipation PD Internally limited W Junction Temperature Range TJ -40 to +150 °C θ JA 105 °C/W Storage Temperature Range TSTG -65 to +150 °C Lead Temperature (Soldering) 10 Sec. TLEAD +300 °C Thermal Resistance (1) Note: (1) Mounted to 3” x 4.5”, 4 layer FR4 PCB in still air per JESD51 standards. 2007 Semtech Corp. 2 www.semtech.com SC4812 POWER MANAGEMENT Electrical Characteristics Unless specified: VCC = 12V, a 10uF capacitor connects VCC to GND, VCS = 0, VIN = 48V, a 0.1uF capacitor connects SS/SHDN to GND, OUT = open circuit, FB = GND, TA = TJ = -40 to +125ºC. Typical values are at TA = 25ºC Parameter Test Conditions Min Typ Max Unit 90 V Startup/Winding Regulator VIN Input Voltage Range VIN Supply Current VIN Supply Current after Startup VIN Shutdown Current VCC Output Voltage VCC Current Limit 12 VIN = 90V, VCC open, driver switching 5 7.5 mA VIN = 90V, VCC open, VFB = 3V, driver not switching 3.5 5 mA VIN = 90V 50 100 µA VIN = 90V, VSS/SHDN = 0 250 380 µA 8 V Power from VIN 6.8 7.4 10% below no load VCC output voltage 12 20 6 6.5 6.7 V 0.8 1 1.4 V 3 7.5 mA mA VCC Supply VCC Turn-on Voltage Hysteresis Operating Current VCC Zener Shunt Voltage ICC = 10mA 15.25 16.25 17.25 V close loop 2.44 2.50 2.56 V VCC = 8V to 14V 2.425 2.575 V 0.8 µA Error Amplifier Feedback Input Voltage Feedback Input Voltage Regulation Input Bias Current 0.5 Amplifier Transconductance 1000 µmho Amplifier Source Current 110 µA Amplifier Sink Current 110 µA Open Loop Voltage Gain 60 dB 28 mV/µS PWM Comparator Slope Compensation Oscillator Clock Frequency Range 235 260 285 kHz Max Duty Cycle 75 80 85 % 2007 Semtech Corp. 3 www.semtech.com SC4812 POWER MANAGEMENT Electrical Characteristics (Cont.) Unless specified: VCC = 12V, a 10uF capacitor connects VCC to GND, VCS = 0, VIN = 48V, a 0.1uF capacitor connects SS/SHDN to GND, OUT = open circuit, FB = GND, TA = TJ = -40 to +125ºC. Typical values are at TA = 25ºC Parameter Test Conditions Min Typ Max Units 419 465 510 mV 1 µA Current Limit CS Threshold Voltage CS Input Bias Current 0 ≤ V C S ≤ 2V -1 Propagation Delay to Gate 70 nS CS Blanking Time 70 nS Soft Start SS Source Current VSS/SHDN = 0 4 SS Sink Current Shutdown Threshold 6 8 1 µA mA VSS/SHDN falling 0.25 0.5 0.6 VSS/SHDN rising 0.61 0.7 0.8 V Output Peak Source Current 570 mA Peak Sink Current 1000 mA Rise Time CL = 1nF 45 nS Fall Time CL = 1nF 35 nS Thermal Shutdown Temperature 150 °C Thermal Hysteresis 25 °C Thermal Shutdow n Note: (1) This device is ESD sensitive. Use of standard ESD handling precautions is required. 2007 Semtech Corp. 4 www.semtech.com SC4812 POWER MANAGEMENT Pin Descriptions Pin # Pin Name Pin Function 1 VIN High voltage startup input. Connect directly to an input voltage between 12 to 90V. Connects internally to a high voltage linear regulator that generates VCC during startup. 2 FB Feedback input to the internal transconductance error amplifier. VFB sensed the regulated output voltage through an external resistor divider. 3 COMP Internal transconductance error amplifier output. Compensation network of the overall loop is placed between this pin and GND. 4 SS/SHDN Soft start timing capacitor connection. Ramp time to full current limit is approximately TBD ms/nF. This pin is also the reference voltage output. Bypass with a minimum 10nF capacitor to GND. The device goes into shutdown when VSS_SHDN is pulled below 0.25V. 5 CS Current sense input. Turns power switch off if VCS rises above 465mV for cycle-by-cycle current limiting. CS is also the feedback for the current mode controller. CS is connected to the PWM comparator through a leading edge blanking circuit. 6 GND Ground. 7 OUT Gate drive. Drives a high voltage external N-channel power MOSFET. 8 VC C Supply voltage. Provides power for entire IC. VCC is regulated from VIN during startup. Bypass VCC with a 10uF tantalum capacitor in parallel with 0.1uF ceramic capacitor to GND. 2007 Semtech Corp. 5 www.semtech.com SC4812 POWER MANAGEMENT Block Diagram 7.4V 2007 Semtech Corp. 6 www.semtech.com SC4812 POWER MANAGEMENT Application Information Introduction The SC4812 is a 8 pin peak current mode controlled PWM controller for isolated or non-isolated DC-DC switching power supplies. It features an internal startup regulator, programmable external soft start and programmable cycle -by-cycle current limit It operates in a fixed frequency at 260KHz. The SC4812 can be applied in a flyback or forward topology with the input voltage ranging from 36V to 75V. RS = 0.465V/(1.2xILIM_PRI) where, ILIM_PRI is the maximum peak primary-side current. When VCS > 465mV, the power MOSFET turns off after 70nS propagation delay from the switch current reaches the trip point to the driver. PWM Comparator and Slope Compensation The SC4812 runs fixed 260 KHz frequency by an internal oscillator. At the beginning of each switching cycle, the OUT pin switches the MOSFET on. the OUT pin switches off after the 80% maximum duty cycle has been reached, regardless of the feedback. Since an artificial slope is required for current-mode operation when duty cycle is larger than 50%, the SC4812 uses an internal ramp generator for slope compensation. The internal ramp signal is reset at the beginning of each cycle and slews at 26mV/µS. The PWM comparator compares the instantaneous primary peak current to the feedback error signal through the opto-coupler, the internal offset and slope compensation and determine when to turn off the MOSFET. In steady state operation, the MOSFET turns off when: Startup Regulator The internal startup regulator of the SC4812 makes its initial startup without a lossy startup resistor or external startup circuitry to save cost and board space. As input voltage exceeds 12V, it provides regulated 7.4V to VCC which is with the maximum turn-on voltage 6.7V. Soft-Start/Shutdown and VCC Lockout During power startup, the output voltage has to ramp up in a controlled manner to avoid overshoot. The SC4812 internal non-inverting terminal to the error amplifier is connected to the soft-start pin, which forces the internal 2.5V reference to gradually ramp up during power startup. In a non-isolated application, as the internal error amplifier is used, output voltage of a converter ramps up with close loop startup fashion smoothly. In case of an isolated application in which the internal error amplifier may not be used, isolated voltage feedback is through an opto-coupler and connected to the COMP pin. During power startup, the COMP pin will follow the soft-start pin voltage through an internal diode. Soft-start operation begins when SS/SHDN ramps above 0.7V. When soft-start completed, SS/SHDN is regulated to 2.50V, the internal voltage reference. Pull SS/SHDN below 0.5V to disable the controller. Undervoltage lockout shuts down the controller when VCC is less than 5.5V. The internal startup regulator and the reference remain on during shutdown. ILIM_PRI · RS > VOPTO – VOFFSET - VSLOPE where ILIM_PRI is the current on the primary side through the MOSFET. VOFFSET is 1.5V internal offset voltage and VSLOPE is the artificial ramp starting at with slew rate 26mV/ µ S. When selecting an inductor in a forward-converter or magnetizing inductance in a flyback-converter, the following condition must be met to avoid control-loop subharmonic oscillations: NS K × RS × VO × = 26mV / µS NP L Current-Sense The function of the CS pin is to limit the peak current through the MOSFET. Current is sensed at CS as a voltage across a sense resistor between the source of the MOSFET and GND. An RC filter is recommended to connect CS to the sense resistor to reduce effect of the MOSFET turn-on leading edge spike and noise. Select the current-sense resistor with the following equation: 2007 Semtech Corp. where K = 0.5 TO 1, AND NS and NP are the turns of the main transformer on secondary and primary side respectively. L is the output inductor on secondary side in a forward-converter or magnetizing inductance on secondary side in a flyback-converter. 7 www.semtech.com SC4812 POWER MANAGEMENT Applications Information (Cont.) PCB Layout Guideline PCB layout is very critical, and the following should be considered to insure proper operation of the SC4812. High switching currents are present in applications and their effect on ground plane must be understood and minimized. 6) The feed back connection between the error amplifier and the FB pin should be kept as short as possible, and the GND connections should be to the quiet GND used for the SC4812. 7) If an opto-coupler is used for isolation, quiet primary and secondary ground planes should be used. The same precautions should be followed for the primary GND plane as mentioned in item 5. For the secondary GND plane, the GND plane method mentioned in item 4 should be followed. 8) All the noise sensitive components such as VCC bypass capacitor, COMP resistor/capacitor network, current sensing circuitry and feedback circuitry should be connected as close as possible to the SC4812. The GND return should be connected to the quiet SC4812 GND plane. 9) The connection from the OUT of the SC4812 should be minimized to avoid any stray inductance. If the layout can not be optimized due to constraints, a small Schottky diode may be connected from the OUT pin to the ground directly at the IC. This will clamp excessive negative voltages at the IC. 1) The high power parts of the circuit should be placed on a board first. A ground plane should be used. Isolated or semi-isolated areas of the ground plane may be deliberately introduced to constrain ground currents to particular areas, for example the input capacitor and the main switch FET ground. 2) The loop formed by the Input Capacitor(s) (Cin), the main transformer and the main switch FET must be kept as small as possible. This loop contains all the high fast transient switching current. Connections should be as wide and as short as possible to minimize loop inductance. Minimizing this loop area will a) reduce EMI, b) lower ground injection currents, resulting in electrically “cleaner” grounds for the rest of the system and c) minimize source ringing, resulting in more reliable gate switching signals. 3) The connection between FETs and the main transformer should be a wide trace or copper region. It should be as short as practical. Since this connection has fast voltage transitions, keeping this connection short will minimize EMI. 4) The output capacitor(s) (Cout) should be located as close to the load as possible. Fast transient load currents are supplied by Cout only. Connections between Cout and the load must be short, wide copper areas to minimize inductance and resistance. 5) A 0.1uF to 1uF ceramic capacitor should be directly connected between VCC and GND and a 1uF to 4.7uF. The SC4812 is best placed over a quiet ground plane area. Avoid pulse currents in the Cin and the main switch FET loop flowing in this area. GND should be returned to the ground plane close to the package and close to the ground side of (one of) the VCC supply capacitor(s). Under no circumstances should GND be returned to a ground inside the Cin and the main switch FET loop. This can be achieved by making a star connection between the quiet GND planes that the SC4812 will be connected to and the noisy high current GND planes connected to the FETs. 2007 Semtech Corp. 8 www.semtech.com TP5 GND 36-75V C12 1nF 3 2 COMP FB D3 1N4148WS 2.4K R11 C5 22uF/100V C14 0.47uF U1 TP13 1 VIN SS/SD 4 8 VCC OUT CS C2 1uF 5 7 3 2 C13 1nF TP7 TP6 1 D1 1N4148WS C8 10uF/16V SC4812 GND 6 9 TP8 100 R10 C9 150pF R4 330 10 R17 4 5 6 3 4 1 2 9 10 R16 0.5 D2 SL43 C25 2.2nF/630V TP10 R1 open C1 open D6 1N4148WS TP9 R12 0.5 M1 Si3440 TP1 8 7 TP4 T1 PA1269 3 4 C15 open R18 open TP11 R21 open U2 PS2521L-1 R6 2.4K C3 470uF/6.3V 2 1 U3 SC431L 1 R7 180 C4 470uF/6.3V 2 2007 Semtech Corp. 3 TP12 C10 15nF R8 open C6 1uF R14 2.0K R9 3.32K R15 0 TP2 RTN 3.3V/4A SC4812 POWER MANAGEMENT SC4812 Evaluation Board - Schematics( Isolated Flyback ) www.semtech.com SC4812 POWER MANAGEMENT SC4812 Evaluation Board - BOM( Isolated Flyback ) Item Qty. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 2007 Semtech Corp. 2 2 1 1 1 1 1 1 1 1 3 1 1 1 1 1 1 1 1 2 1 2 1 1 1 1 1 Reference C2,C6 C3,C4 C5 C8 C9 C10 C12 C13 C14 C25 D1,D3,D6 D2 M1 R4 R6 R7 R9 R10 R11 R12,R16 R14 R15,R21 R17 T1 U1 U2 U3 Part/Value 1uF/6.3V 470uF/6.3V 22uF/100V 10uF/16V 150pF 15nF 1nF 1000pF 0.1uF 2.2nF/630V 1N4148WS SL43 Si3440 330 2.4K 180 3.32K 100 10K 0.5 2.0K 0 10 PA1269 SC4812 PS2521L-1 SC431L 10 Manufacturer Kemet Sanyo Panasonic-ECG TDK muRata Panasonic-ECG Vishay Vishay Vishay TDK Vishay Vishay Vishay Vishay Vishay Vishay Vishay Panasonic-ECG Vishay Susumu Yageo America Vishay Yageo America Pulse Eng. Semtech NEC Semtech Manufacturer P.N. C0805C105M9PAC3810 6TPB470M ECA-2AHG220 C3216X7R1C106MT GRM2165C2A151JA01 ECJ-2VB1H153K VJ0805Y102KXXAT VJ0805Y102KXXAT VJ0805Y104KXXxx C3216X7R2J222K 1N4148WS-V-GS08 SL43 SI3440DV-T1-E3 CRCW0805330RFKEA CRCW08052K40FKEA CRCW0805180RFKEA CRCW08053K32FKEA ERJ-6ENF1000V CRCW080510K0FK RL1220S-R50-F 9C08052A2001FKHFT CRCW08050000ZSTA 9C08052A10R0FKHFT PA1269 SC4812STRT PS2521L-1 SC431LCSK www.semtech.com TP5 GND 36-75V C15 47nF R6 1K C12 1nF C5 22uF/100V 3 2 COMP FB D3 1N4148WS TP13 1 VIN C14 0.47uF SS/SD 4 8 C2 1uF 5 U1 SC4812 CS 7 3 2 1 C13 1nF TP7 TP6 C8 10uF/16V OUT VCC 11 GND 2007 Semtech Corp. 6 TP12 D1 1N4148WS 100 R10 C9 150pF R4 330 10 R17 4 5 6 3 4 1 2 R12 0.25 D2 SL43 R1 open C1 open R16 0.25 9 10 TP4 M1 Si3440 TP1 8 7 T1 PA1269 C3 470uF/6.3V C4 470uF/6.3V C6 1uF R14 1.0K R9 1.0K R15 0 TP2 RTN 5V/2.6A SC4812 POWER MANAGEMENT SC4812 Evaluation Board - Schematics( Non-Isolated Flyback ) www.semtech.com SC4812 POWER MANAGEMENT SC4812 Evaluation Board - BOM( Non-Isolated Flyback ) Item 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 Qty. 2 2 1 1 1 2 1 1 1 2 1 1 3 2 2 1 1 2007 Semtech Corp. Reference C2,C6 C3,C4 C5 C8 C9 C12, C13 C14 C16 D1, D3 D2 M1 R4 R9, R13, R14 R10,R17 R12,R16 T1 U1 Part/Value 1uF/16V 470uF/6.3V 22uf/100V 10uF/16V 150pF/100V 1nF/16V 0.1uF/16V 47nF/16V 1N4148WS SL43 Si3440 330 1.0K 100 0.25 PA1260 SC4812 12 Manufacturer Panasonic-ECG Sanyo Panasonic-ECG TDK Panasonic-ECG Vishay Vishay Vishay Vishay Vishay Vishay Vishay Panasonic-ECG Vishay Panasonic-ECG Pulse Semtech Manufacturer P.N. ECJ-2FB1C105K 6TPB470M ECA-2AHG220 C3216X7R1C106MT ECJ-2VC2A151x VJ0805Y102KXJPW1BC VJ0805Y104KXJAC VJ0805Y473KXJxx 1N4148WS-V-GS08 SL43 SI3440DV-T1-E3 CRCW0805330RJNEA ERJ-6ENF1001V CRCW0805100RFKxx ERJ-6BQFR24x PA1260 SC4812STRT www.semtech.com GND TP5 C5 1u,100V 36-75V C12 1nF C9 22uF/100V 3 2 COMP FB D4 1N4148WS 10K R11 C7 1u,100V U1 TP13 D7 MMSZ4699(12V) 1 VIN CS OUT 5 7 TP8 TP6 1 R19 C13 1000pF TP7 C2 1uF D1 1N4148WS C8 10uF/16V TP12 Q1 FMMT618 5.1K R22 C14 SC4812 0.47uF SS/SD 4 8 VCC GND 6 13 TP9 100 R10 10 R17 R12 0.1 open TP10 C1 R1 open D6 1N4148WS Q2 SUM27N20-78 TP4 T1 CTX03-14856 9 8 12 11 C25 2.2nF/630V 2 1 6 5 4 TP1 TP11 3 4 R6 2.4K U2 PS2521L-1 C15 open R18 open 2 1 1 U3 SC431 R7 360 C3 D2 MBRB2035CT 470uF/6.3V L1 4.7uH 2 2007 Semtech Corp. 3 D3 BY M07-200 3 R8 open C10 15nF C6 C4 470uF/6.3V 1uF R14 1.0K R9 1.0K TP3 R15 0 TP2 RTN 5V/10 SC4812 POWER MANAGEMENT SC4810B Evaluation Board - Schematics( Forward ) www.semtech.com SC4812 POWER MANAGEMENT SC4812 Evaluation Board - BOM( Forward ) Item Qty. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 2007 Semtech Corp. 1 2 2 2 1 1 1 1 1 1 2 1 1 1 1 1 1 2 1 1 2 1 1 1 1 1 1 1 1 1 1 Reference C9 C2, C6 C3, C4 C5, C7 C8 C10 C12 C13 C14 C25 D1, D6 D2 D3 D7 L1 Q1 Q2 R5, R15 R6 R7 R9, R14 R10 R11 R12 R17 R19 R22 T1 U1 U2 U3 Part/Value Manufacturer Manufacturer P. N. 22uf/100V Panasonic-ECG ECA2AHG220 1uf/6.3V Kemet C0805C105M9PAC3810 470uf,/6.3V Sanyo 6TPB470M 1uf/100V 10uf/16V TDK C3216X7R1C106MT 15nf Panasonic-ECG ECJ2VB1H153K 1nf Vishay VJ0805Y102KXXAT 1000pf Vishay VJ0805Y102KXXAT 0.47uf TDK C2012X7R1E474K 2.2nf/630V TDK C3216X7R2J222K 1N4148WS Vishay 1N4148WS-V-GS08 MBRB2035CT Vishay MBRB2035CT/31 BYM07-200 Vishay BYM07-200 MMSZ4699(12V) ON Semiconductor MMSZ4699T1 4.7uH Cooper Bussmann HC2LP-4R7 FMMT618 Zetex FMMT618TA SUM27N20-78 Vishay SUM27N20-78-E3 0 ohm Vishay CRCW08050000ZSTA 2.4k ohm Vishay CRCW08052K40FKEA 360 ohm Panasonic-ECG ERJ6GEYJ361V 1.0k ohm Panasonic-ECG ERJ6ENF1001V 100 ohm Panasonic-ECG ERJ6ENF1000V 10k ohm Vishay CRCW080510K0FK 0.1 ohm Panasonic-ECG ERJ1TRSFR10x 10 ohm Yageo America 9C08052A10R0FKHFT 1 ohm Panasonic-ECG ERJ6GEYJ1R0V 5.1k ohm Panasonic-ECG ERJ6GEYJ512V CTX03-14856 Cooper Bussmann CTX03-14856 SC4812 Semtech SC4812STRT PS2521L-1 NEC PS2521L-1-E3-A SC431 Semtech SC431CSK-1.TRT 14 www.semtech.com SC4812 POWER MANAGEMENT Outline Drawing - SO-8 A D e N DIM A A1 A2 b c D E1 E e h L L1 N 01 aaa bbb ccc 2X E/2 E1 E 1 2 ccc C 2X N/2 TIPS e/2 B D DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX .069 .053 .010 .004 .065 .049 .020 .012 .010 .007 .189 .193 .197 .150 .154 .157 .236 BSC .050 BSC .010 .020 .016 .028 .041 (.041) 8 8° 0° .004 .010 .008 aaa C SEATING PLANE h A2 A C A1 bxN bbb 1.75 1.35 0.25 0.10 1.65 1.25 0.51 0.31 0.25 0.17 4.80 4.90 5.00 3.80 3.90 4.00 6.00 BSC 1.27 BSC 0.25 0.50 0.40 0.72 1.04 (1.04) 8 8° 0° 0.10 0.25 0.20 h H C A-B D c GAGE PLANE 0.25 SEE DETAIL L (L1) A DETAIL SIDE VIEW 01 A NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. 4. REFERENCE JEDEC STD MS-012, VARIATION AA. Land Pattern - SO-8 X DIM (C) G C G P X Y Z Z Y DIMENSIONS INCHES MILLIMETERS (.205) .118 .050 .024 .087 .291 (5.20) 3.00 1.27 0.60 2.20 7.40 P NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. 2. REFERENCE IPC-SM-782A, RLP NO. 300A. Contact Information Semtech Corporation Power Management Products Division 200 Flynn Road, Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 2007 Semtech Corp. 15 www.semtech.com