SC2647 Multi-Platform Multi-Phase PWM Controller POWER MANAGEMENT Description The VID structure of the SC2647 supports VID-on-Fly applications for any platform. The cycle-by-cycle current limit plus the intelligent over current shut down provide the maximum versatility of the system without false tripping under all possible changes of VID and load conditions. The differential voltage feedback sense eliminates the error caused by high load current on the ground plane. External offset is easy to achieve for any platforms and the VID settings. The enable function is also provided to interface with the corresponding system signal for correct start up timing and shut down timing. (Multiple Patents Pending) The SC2647 provides microprocessor core voltage regulation solution up to 4 paralleled PWM channels. The solution can also be configured as 2, 3, or 4-phase form. Multi-phase buck regulator utilizes the phase-shift timing control to allow interleaved switching of the power switches. This architecture minimizes the core voltage ripple and the input current ripple, which leads to optimized voltage regulator design for power density, transient responses, and the thermal performances. To satisfy the highly dynamic nature of the modern microprocessors, the SC2647 adopts peak current mode control topology which ensures wide control loop bandwidth and fast transient responses. The current mode control provides intrinsic phase current matching. The maximum ripple frequency is greater than 1MHz. Features One of the outstanding features of the SC2647 is its voltage regulation accuracy. Not only it provides better than 0.5% set point accuracy, but also the accuracy to fully complaint with the stringent load line slope specifications mandated by the modern microprocessors. Lossless output current sensing ensures the regulator output voltage is accurately positioned according to the load current condition, and an internal temperature compensation technology further enhances the performance of voltage accuracy. The patented Combi-Sense TM topology is employed by SC2647. The MOSFET Rds(on) and the output inductor winding resistance is used to generate the phase current information. The SC1211VX Combi-SenseTM MOSFET driver plus the SC2647 enables the complete solution. The SC2647 is a multi-platform controller. It conforms to Intel VRM/VRD10.0, VRM9.X, and AMD K-8 (OpteronTM) VID specifications. With very minor changes of the schematic and the layout, the SC2647 based solution can be ported form one platform to another. This greatly benefits the system manufactures for reductions of design cycle and minimize the inventory management. July, 12, 2006 VRD/VRM10.0, VRM9.X, and K-8 compliant Core Voltage Set Point Accuracy 0.5% Combi-SenseTM Current Mode Control Intrinsic Phase Current Matching Fast Transient Responses Active Droop with Temperature Compensation to Meet Load Line Slope Support VID-on-Fly with 5 or 6 bit VID Enable Function for Power Sequencing Cycle-by-Cycle Peak Current Limit Intelligent Over Current Shut Down Over Voltage Protection When Using Semtech Combi-SenseTM Driver/1211VX Under Voltage Protection Built in External programmable Soft-Start Externally programmable switching frequency. 2, 3, or 4-Phase Configurations 24-Pin SOIC or TSSOP Packages This device is fully WEEE and RoHS Compliant Applications 1 Voltage Regulator VRD/VRM10.0 Voltage Regulator VRM9.X Voltage Regulator K-8 High Current, Low Voltage Step Down DC/DC Converters www.semtech.com © 2006 Semtech Corp. 2 VID4 VID3 VID2 PGND BG BST VIN CO VPN 7 4.7uF C30 8 Notes: (1) Output filter design: Please follow guidelines issued by Intel and AMD . (2) Please follow the guidelines issued by Intel and AMD . (3) See application notes for VID table selection. VIN 4 VCC Ry 5 TG AUX1 3 DRN R23 100 6 1nF 9 1 R21 M6 VIN VIN PN1 PN2 1 Note (2) U4 2 SC1211VX M5 M4 M3 M2 L4 L3 L2 0R0 R24 2 PWRGOOD (Open Collector Output) VID5 Note (3) C27 PN1 1uF 1 R17 1 PN3 2 Rx Vcc DIFFERENTIAL PAIR FOR REMOTE SENSE 9 9 C24 4.7uF 1 V_CORE+ V_CORE- D1N4148 D3 VIN C23 7 VID1 SC2647 8 VID0 1uF VPN 13 14 CO VID1 VID0 PGND BG VID2 VID3 AUX2 SC1211VX VCC 12 11 R19 100 1nF VIN Note (2) C21 Rosc BST 10 VID5 15 16 TG VID4 PGOOD DRN 10 OSCREF 2 VCC 1uF C13 4.7uF C12 1 DACSTEP U3 PGND R6 M1 1 9 C19 PN2 4 17 18 19 D1N4148 D2 5 8 AGND OUT1 20 21 22 VIN 3 R20 C18 0.1uF FB GNDSEN OUT2 OUT3 OUT4 VCC 6 C17 7 6 ERROUT BGOUT OS1 23 24 AUX3 1uF VIN 2 5V C2 2 VCC 5 4 3 OS4 OUTSEN R12 100 1nF VPN OS2 R10 SC1211VX CO OS3 U2 C9 C5 U1 VIN 7 2 1 R9 PN3 BST 8 1uF C16 C8 R5 D1N4148 C3 BG R16 OFFSET- R14 R8 C4 2R2 VCC VCC OFFSET+ C7 R4 VOUT TG 1.5K R7 R3 AUX3 D1 4 DRN R15 R13 1 R2 AUX2 R1 3 C6 AUX1 640nH 2 (Open Collector Input, No Pull-up) 5V L1 1 VRM_EN 5V Adaptor_In PGND Cout Note (1) + VOUT SC2647 POWER MANAGEMENT Typical Application Circuit 1 6 5 www.semtech.com SC2647 POWER MANAGEMENT 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. Parameter Symbol Maximum Units VCC 20 V OS1, OS2, OS3, OS4, OUTSEN 5 V Ambient Temperature Range TA 0 to 105 o Junction Temperature Range TJ 0 to 125 o Storage Temperature Range TSTG -65 to +150 o Lead Temperature (Soldering) 10 Sec. TLEAD 300 o ESD Rating (Human Body Model) ESD 2 Supply Voltage Combi-Sense/Direct Output Voltage C C C C kV Electrical Characteristics o Unless specified: VCC = 5V, VID=1.30V (110110,VRD10) or 1.50V (101110,VRD10), FOSC = 600kHz, TA = 27 C. See Typical Application Circuit. Parameter Symbol Test Conditions Min Typ Max Units 4.7 5 7 V Chip_Supply IC Supply Voltage VCC IC Supply Current ICC 9.5 mA UVLO Ramp Up 4.3 V UVLO Hysterisis 300 mV CBGOUT = 4.7nF 3 V Source Current BG=0V 270 μA Sink Current BG=4V -500 μA Supply Rejection VCC = 4.7V ~ 7V 0.5 mV/V Temperature Stability 0oC < TA < 85oC 0.5 % VID Step VRM9.X, K-8, LSB 25 mV VID Step VRD/VRM10, LSB 12.5 mV Reference Section Bandgap Output Voltage Accuracy VBGOUT VOUT VRD10 ; Internal offset=-20mV -0.5 +0.5 % VRM9.x ; Internal offset=-20mV -1 +1 % K-8 ; Internal offset=+25mV -1 +1 % 660 kHz Oscillator Section Oscillator Frequency ROSC = 309Kohm Temperature Stability 0oC < TA < 85oC © 2006 Semtech Corp. 3 540 600 +/-5 % www.semtech.com SC2647 POWER MANAGEMENT Electrical Characteristics (Cont.) o Unless specified: VCC = 5V, VID=1.30V (110110,VRD10) or 1.50V (101110,VRD10), FOSC = 600kHz, TA = 27 C. See Typical Application Circuit. Parameter Test C onditions Min Typ Max U nits Voltage Error Amplifier Input Offset Voltage +/-3 mV Input Bi as C urrent 25 nA 1V < VERROUT < 3.6V 80 dB C ERROUT = 10pF 10 MHz 2 V/μS 0.5 mA/V Input Offset Voltage +/-3 mV Input Bi as C urrent 50 nA Gai n 9.5 V/V 80 dB Open Loop Gai n Uni ty Gai n Bandwi dth Slew Rate Transconductance Gai n C urrent Sense Amplifiers C MRR 0 to 3V Input C ommon Mode Range -0.3 3 V Gai n Match 2 % Bandwi dth 6 MHz 5.2 V/V D roop Amplifier Gai n VID s Logi c Threshold [VID 0:4] Pull-up Impedance [VID 0:4] VID 5 Logi c Threshold for VRD /VRM10 VID 5 1.2 1.8 10 1.2 VID 5 C lampi ng voltage V Kohm 1.8 V 2.7 V VID 5 Selecti on Threshold for VRM9.X VID 5/Si nk 49 uA VID 5 Selecti on Threshold for K-8 VID 5/Si nk 205 uA 4.1 V 3-Phase Operation Output 4 pull up Threshold 3.7 Pow er Good Threshold Ri si ng VID - Power Good Threshold 330 mV Threshold Falli ng VID - Power Good Threshold 560 mV Output Hi gh Leakage Pwrgood = VCC 100 nA Output Low Si nk Pwrgood = 0.8V 2 mA C urrent Limit Section Max. Error Amp Voltage for C urrent Li mi t Shutdown Voltage © 2006 Semtech Corp. VID - Shut D own Threshold 4 3.6 V 600 mV www.semtech.com SC2647 POWER MANAGEMENT Pin Configurations Ordering Information Top View Part N umber SC 2647SWTR OS3 OS2 OS1 BGOUT ERROUT GSENSE FB DACSTEP VCC VID4 VID3 VID2 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 OS4 OUTSEN OUT4 OUT3 OUT2 OUT1 AGND OSCREF PGOOD VID5 VID0 VID1 SC 2647TSTR (1) (1) SC 2647TSTRT (1,3) S C 2647E V B (2) P ackag e Temp. R ange (TJ) SOIC -24 0 to 125 OC TSSOP-24 0 to 125 OC TSSOP-24 0 to 125 OC Evaluati on Board Note: (1) Only available in tape and reel packaging. A reel contains 1000 devices for the SOIC-24 and 2500 devices for the TSSOP-24 package. (2) Specify SOIC-24 or TSSOP-24 package. (3) Lead free product. This product is fully WEEE and RoHS compliant. (24-Pin SOIC/TSSOP) Pin Descriptions P in # P in N a m e 1 OS 3 C urre nt se nse i np ut. 2 OS 2 C urre nt se nse i np ut.C o nne ct to O UTS E N fo r 2 p ha se o p e ra tio n. 3 OS 1 C urre nt se nse i np ut. 4 B GO UT B G re fe re nce p in.C o nne ct so ft s ta rt c a p fro m this p i n to A GND . 5 E RROUT E rro r-a m p lifi e r o utp ut.C o nne c t co m p e nsa ti o n ne two rk to A GND . 6 G S E NS E Re m o te s e ns e fo r G ND . 7 FB 8 D A C S TE P 9 VCC P o we r sup p ly fo r chip . 1 0 ~1 4 V ID 4 : 0 V ID M S B to V ID L S B . 15 V ID 5 16 P G OOD 17 O S C RE F 18 A GND C le a n g ro und fo r a na lo g s ig na ls . 19 OUT1 P W M o utp ut1 . 20 OUT2 P W M o utp ut2 . 21 OUT3 P W M o utp ut3 . 22 OUT4 P W M o utp ut4 . C o nne c t to V C C fo r 3 p ha s e o p e ra ti o n. 23 OUTS E N 24 OS 4 © 2006 Semtech Corp. P in F u n c tio n F e e d b a c k p i n.Ro ute F B a nd GE NS E a s d i ffe re ntia l p a i r to C P U. V ID ste p s p e e d .C o nne c t a ca p fro m this p i n to A GND to fi lte r D A C o utp ut. 1 2 .5 m V b it fo r V RD 1 0 .x. P ull i t up to >2 V a nd p ro g ra m the s ink curre nt to se le ctV RM 9 o r K 8 V ID ta b le . P o we r g o o d , O p e n co lle cto r o utp ut. Osc illa to r fre q ue ncy se tti ng .C o nne ct a re si sto r to A GND . D i re c t o utp ut se nse . C urre nt se nse i np ut. C o nne ct to O UTS E N fo r 2 o r 3 p ha se o p e ra tio n. 5 www.semtech.com SC2647 POWER MANAGEMENT Block Diagram C/A1 + 3 OS1 + OUT OUT - C/A2 + OUT Q 19 OUT1 20 OUT2 21 OUT3 22 OUT4 S DRV2 PWM2 OUT - C/A3 R - Q S + 1 OS3 R - + 2 OS2 DRV1 PWM1 + OUT DRV3 PWM3 OUT - C/A4 R - Q S + OS4 24 OUT + - OUTSEN DRV4 PWM4 OUT R - Q S OUTSEN 23 Errout OSCILLATOR Ramp CLOCK DIVIDER ROSC OSCREF 17 OSC CLK SEL3 VID0 11111 INHIBIT 14 VID1 13 VID2 12 VID3 11 VID0 VID1 VID2 VID3 VID4 VID5 Shut Down DAC P1 P2 P3 P4 + OUT 3 PHASE SELECT 2R - 3/4 Phase selection Threshold - VDAC 2R OUT 0 + VID4 10 VID5 15 DACSTEP 8 R VBG PWR_GOOD + 16 PWRGD 5 ERROUT 9 VCC 18 AGND OUT OUTSEN DROOP Power Good Threshold R + - 0 OUT - 7 FB R R E/A ERROUT OUT + OCP & SHUTDOWM R BGOUT BGOUT 4 - 0 OUT BUFFER + VCC BANDGAP VCC GNDSEN 6 © 2006 Semtech Corp. GSEN UVLO & LATCH VREF VBG 6 BGOUT www.semtech.com SC2647 POWER MANAGEMENT Applications Information- Output Voltage VRM9.X Output Voltage Unless specified: 0 = GND; 1 = High (or Floating). TA = 25oC, VCC = 5V VID4 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 © 2006 Semtech Corp. VID3 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 VID2 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 VID1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 7 VID0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 Vout (V) OFF 1.1 1.125 1.15 1.175 1.2 1.225 1.25 1.275 1.3 1.325 1.35 1.375 1.4 1.425 1.45 1.475 1.5 1.525 1.55 1.575 1.6 1.625 1.65 1.675 1.7 1.725 1.75 1.775 1.8 1.825 1.85 www.semtech.com SC2647 POWER MANAGEMENT Applications Information- Output Voltag V R D 10 Ou tp u t Vo ltage Unless specified: 0 = GND ; 1 = High. TA = 25 o C , V C C = 5V V ID 5 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 © 2006 Semtech Corp. V ID 4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 V ID 3 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 V ID 2 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 8 V ID 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 V ID 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 Vou t (V ) 0.8375 0.8500 0.8625 0.8750 0.8875 0.9000 0.9125 0.9250 0.9375 0.9500 0.9625 0.9750 0.9875 1.0000 1.0125 1.0250 1.0375 1.0500 1.0625 1.0750 1.0875 OF F OF F 1.1000 1.1125 1.1250 1.1375 1.1500 1.1625 1.1750 1.1875 1.2000 1.2125 1.2250 1.2375 1.2500 1.2625 1.2750 1.2875 1.3000 1.3125 1.3250 1.3375 1.3500 1.3625 1.3750 1.3875 1.4000 1.4125 1.4250 1.4375 1.4500 1.4625 1.4750 1.4875 1.5000 1.5125 1.5250 1.5375 1.5500 1.5625 1.5750 1.5875 1.6000 www.semtech.com SC2647 POWER MANAGEMENT Applications Information- Output Voltag K -8 Output Voltage Unless speci fi ed: 0 = GND ; 1 = Hi gh (or Floati ng). TA = 25oC , VCC = 5V VID 4 VID 3 VID 2 VID 1 VID 0 VOUT (V) 0 0 0 0 0 1.550 0 0 0 0 1 1.525 0 0 0 1 0 1.500 0 0 0 1 1 1.475 0 0 1 0 0 1.450 0 0 1 0 1 1.425 0 0 1 1 0 1.400 0 0 1 1 1 1.375 0 1 0 0 0 1.350 0 1 0 0 1 1.325 0 1 0 1 0 1.300 0 1 0 1 1 1.275 0 1 1 0 0 1.250 0 1 1 0 1 1.225 0 1 1 1 0 1.200 0 1 1 1 1 1.175 1 0 0 0 0 1.150 1 0 0 0 1 1.125 1 0 0 1 0 1.100 1 0 0 1 1 1.075 1 0 1 0 0 1.050 1 0 1 0 1 1.025 1 0 1 1 0 1.000 1 0 1 1 1 0.975 1 1 0 0 0 0.950 1 1 0 0 1 0.925 1 1 0 1 0 0.900 1 1 0 1 1 0.875 1 1 1 0 0 0.850 1 1 1 0 1 0.825 1 1 1 1 0 0.800 1 1 1 1 1 OFF © 2006 Semtech Corp. 9 www.semtech.com SC2647 POWER MANAGEMENT Outline Drawing - SOIC-24 A D e N DIM A A1 A2 b c D E1 E e h J L L1 N R 01 aaa bbb ccc 2X E/2 E1 E R 1 ccc C 2 2X N/2 TIPS 3 e/2 B D DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX .093 .104 2.35 2.65 .004 .012 0.10 0.30 .081 .100 2.05 2.55 .020 0.31 0.51 .012 .008 .013 0.20 0.33 .602 .606 .610 15.30 15.40 15.50 .291 .295 .299 7.40 7.50 7.60 10.30 BSC .406 BSC 1.27 BSC .050 BSC .010 .030 0.25 0.75 .020 .030 0.50 0.75 .016 .041 0.40 1.04 (.041) (1.04) 24 24 .024 .035 0.60 0.90 0 8 0 8 0.10 .004 0.25 .010 0.33 .013 h aaa C A2 A SEATING PLANE h H bxN bbb C A1 C A-B D c GAGE PLANE J 0.25 SEE DETAIL SIDE VIEW A L (L1) DETAIL 01 A NOTES: 1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H- 3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. 4. REFERENCE JEDEC STD MS-013, VARIATION AD. Land Pattern - SOIC-24 X D IM (C ) G Z C G P X Y Z D IM E N S IO N S IN C H E S M IL L IM E T E R S (.3 6 2 ) .2 7 6 .0 5 0 .0 2 4 .0 8 7 .4 4 9 (9 .2 0 ) 7 .0 0 1 .2 7 0 .6 0 2 .2 0 1 1 .4 0 Y P N O TES : 1. T H IS L A N D P A T T E R N IS F O R R E F E R E N C E P U R P O S E S O N L Y . C O N S U L T Y O U R M A N U F A C T U R IN G G R O U P T O E N S U R E Y O U R C O M P A N Y 'S M A N U F A C T U R IN G G U ID E L IN E S A R E M E T . 2. R E F E R E N C E IP C -S M -7 8 2 A , R L P N O . 3 0 7 A . Contact Information Semtech Corporation Power Management Products Division 200 Flynn Rd., Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 © 2006 Semtech Corp. 10 www.semtech.com SC2647 POWER MANAGEMENT Outline Drawing - TSSOP-24 A D IM D e A A1 A2 b c D E1 E e L L1 N 01 a aa b bb ccc N 2 X E /2 E1 E P IN 1 IN D IC A T O R 1 2 3 c cc C 2 X N /2 T IP S e/2 B .002 .031 .007 .003 .303 .169 .0 47 .0 06 .0 42 .0 12 .0 07 .3 07 .3 11 .1 73 .1 77 .2 52 B S C .0 26 B S C .018 .0 24 .0 30 (.03 9) 24 8 0 .0 04 .0 04 .0 08 1 .2 0 0 .1 5 1 .0 5 0 .3 0 0 .2 0 7 .80 7 .9 0 4 .40 4 .5 0 6.40 B S C 0.65 B S C 0 .45 0 .60 0 .7 5 (1 .0 ) 24 0 8 0 .10 0 .10 0 .20 0 .05 0 .80 0 .19 0 .09 7 .70 4 .30 D aa a C S E A T IN G P LA N E D IM E N S IO N S IN C H E S M IL L IM E T E R S M IN N O M M A X M IN N O M M A X A2 C A H A1 b xN b bb C A -B D c GAGE PLANE 0 .25 L (L 1) S E E D E T A IL S ID E V IE W D E T A IL A 01 A NOTES: 1. C O N T R O L L IN G D IM E N S IO N S A R E IN M IL L IM E T E R S (A N G LE S IN D E G R E E S ). 2. DATUM S 3. D IM E N S IO N S "E 1 " A N D "D " D O N O T IN C L U D E M O L D F L A S H , P R O T R U S IO N S OR G ATE BURRS. 4. R E F E R E N C E J E D E C S T D M O -1 5 3 , V A R IA T IO N A D . -A - AND -B - T O B E D E T E R M IN E D A T D A T U M P L A N E -H - Land Pattern - TSSOP-24 X D IM (C ) G C G P X Y Z Z Y D IM E N S IO N S IN C H E S M IL L IM E T E R S (.2 2 2 ) .1 6 1 .0 2 6 .0 1 6 .0 6 1 .2 8 3 (5 .6 5 ) 4 .1 0 0 .6 5 0 .4 0 1 .5 5 7 .2 0 P NOTES: 1. T H IS L A N D P A T T E R N IS F O R R E F E R E N C E P U R P O S E S O N L Y . C O N S U L T Y O U R M A N U F A C T U R IN G G R O U P T O E N S U R E Y O U R C O M P A N Y 'S M A N U F A C T U R IN G G U ID E L IN E S A R E M E T . Contact Information Semtech Corporation Power Management Products Division 200 Flynn Rd., Camarillo, CA 93012 Phone: (805)498-2111 FAX (805)498-3804 © 2006 Semtech Corp. 11 www.semtech.com