SEMTECH SC2642

SC2642 Multi-Platform Two-Phase PWM Controller POWER MANAGEMENT The VID structure of the SC2642 supports VID-on-Fly ap- Description plications for any platform. The cycle-by-cycle current limit The SC2642 provides microprocessor core voltage plus the intelligent over current shut down provide the regulation solution with two paralleled PWM channels. maximum versatility of the system without false tripping Multi-phase buck regulator utilizes the phase-shift tim- under all possible changes of VID and load conditions. ing control to allow interleaved switching of the power The differential voltage feedback sense eliminates the switches. This architecture minimizes the core voltage error caused by high load current on the ground plane. ripple and the input current ripple, which leads to opti- External offset is easy to achieve for any platforms and mized voltage regulator design for power density, tran- the VID settings. The enable function is also provided to sient responses, and the thermal performances. interface with the corresponding system signal for correct start up timing and shut down timing. To satisfy the highly dynamic nature of the modern microprocessors, the SC2642 adopts peak current mode control topology which ensures wide control loop band- width and fast transient responses. The current mode control provides intrinsic phase current matching. The Features maximum ripple frequency is greater than 1MHz. ! VRD/VRM10.0, VRM9.X, and K-8 compliant One of the outstanding features of the SC2642 is its volt- ! Core Voltage Set Point Accuracy 0.5% TM age regulation accuracy. Not only it provides better than ! Combi-Sense Current Mode Control 1% set point accuracy, but also the accuracy to fully com- ! Intrinsic Phase Current Matching plaint with the stringent load line slope specifications ! Fast Transient Responses mandated by the modern microprocessors.Lossless out- ! Active Droop with Temperature Compensation to Meet put current sensing ensures the regulator output voltage Load Line Slope is accurately positioned according to the load current con- ! Support VID-on-Fly with 5 or 6 bit VID dition, and an internal temperature compensation tech- ! Enable Function for Power Sequencing nology further enhances the performance of voltage ac- ! Cycle-by-Cycle Peak Current Limit curacy. ! Intelligent Over Current Shut Down ! Over Voltage Protection When Using Semtech TM TM The patented Combi-Sense topology is employed by Combi-Sense Driver SC1211 SC2642. The MOSFET R and the output inductor ds(on) ! Under Voltage Protection Built in winding resistance are used to generate the phase cur- ! External programmable Soft-Start TM rent information. The Combi-Sense MOSFET driver plus ! Externally programmable switching frequency (up to the SC2642 enables the complete solution. 1MHz output ripple frequency) The SC2642 is a multi-platform controller. It conforms to TM Intel VRM/VRD10.0, VRM9.X, and AMD K-8 (Opteron ) VID specifications. With very minor changes of the sche- matic and the layout, the SC2642 based solution can be Applications ported form one platform to another. This greatly ben- ! Voltage Regulator VRD10.x efits the system manufactures for reductions of design ! Voltage Regulator VRM9.X cycle and minimize the inventory management. ! Voltage Regulator K-8 ! High Current, Low Voltage Step Down DC/DC Converters April 22, 2005 1 www.semtech.com VIN VPN2 ATX12V L1 ATX12V 1 2 C1 640nH 4.7uF D1 C2 R1 VIN C3 R2 1800uF/16V 1800uF/16V 4.7uF/1206 D1N4148 1uF 1R0 4.7uF/1206 1800uF/16V VIN 1nF 100 + C4 + C5 C7 C8 C6 + M1 M2 M3 M4 U1 PN2 PN1 L2 L3 VOUT 2 1 1 2 VOUT R3 R4 IR0 IR0 Note (1) M5 M6 M7 M8 VIN + COUT1 C9 R6 C13 C10 2.2nF R5 C11 D2 2.2nF 100 1nF PGND C12 1R0 1uF D1N4148 4.7uF VPN1 R7 VPN1 VPN2 VOUT 0R0 Note (1) R8 R9 C14 R10 C15 C16 R11 R12 C17 R13 VRM_EN U2 (Open Collector/Drain Input, No Pull-up) R14 20 19 OS2 OUTSEN 1 18 OS1 OUT2 1.5K VCC 2 17 BGOUT OUT1 R16 R15 C18 3 16 Pull-up Voltage ERROUT AGND 1uF C20 ROSC1 VR10: 2V OFFSET+ R17 0.1uF 4 15 GNDSEN OSCREF OFFSET- C19 VRM9.x: 5V 5 13 FB VID5 K-8: 12V ATX12V VCC 6 14 DACSTEP PGOOD R18 7 12 VCC VID0 Use the same power VID5 10 8 11 VID4 VID1 source as FET driver C21 VID0 9 10 VID3 VID2 4.7uF VID1 SC2642 VID2 DIFFERENTIAL PAIR V_CORE- VID3 FOR REMOTE SENSE V_CORE+ VID4 Note (2) Note (2) PWRGOOD (Open Collector Output) Notes:   (1) Output filter design: Please follow guidelines issued by Intel and AMD .   (2) Please follow the guidelines issued by Intel and AMD . SC2642 POWER MANAGEMENT Typical Application Circuit SC1214 11 10 DRN2 PGND 12 9 TG2 BG2 13 8 BST2 VREG2 14 7 CO2 VIN2 15 6 NC VPN2 16 5 VPN1 NC 17 4 VIN1 CO1 18 3 VREG1 BST1 19 2 BG1 TG1 20 1 PGND DRN1  2005 Semtech Corp. 2 www.semtech.com SC2642 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 Sm ymbol Ms aximu Unit SV upply Voltage 2V 0 CC Combi-Sense/Direct Output Voltage O5 S1, OS2, OUTSEN V VID pins except VID5,Frequency pin V7 ID0 ~ VID4,OSCREF V Ground sense G3 SENSE -V 0.3 to 0. All other pins VV cc + 0.3 o AT mbient Temperature Range 0 to 105 C A o JT unction Temperature Range 0 to 125 C J o ST torage Temperature Range -65 to +150 C STG o LT ead Temperature (Soldering) 10 Sec. 260 C LEAD Electrical Characteristics o Unless specified: V = 12V, VID=1.50V (101110,VRD10), F = 200kHz/phase, T = 27 C. See Typical Application Circuit. CC OSC A Pl arameter Ss ymboTn est Condition Mp i Tx y Ms a Unit Chip_Supply IV C Supply Voltage 72 .5 141V CC II C Supply Current 13 0 1A m CC UVLO Ramp Up 75 .3 7V . UVLO Ramp Down 66 .46V . Reference Section BV andgap Output C=5 4.7nF 20 .9425 .99 3V .03 BGOUT BGOUT Source Current 20 20 30 0 33 µA SV upply Rejection =5 10.0V ~ 14.0V 0V . mV/ CC o o T0 emperature Stability C < T < 85C1 % A VID Step V5 RM9.X, K-8, LSB 2V m VB ID Step V5 RD/VRM10, LS 1V 2. m V5 RD10 ; Internal offset=-20mV-5 0. +% 0. VV oltage Accuracy V1 RM9.x ; Internal offset=-20mV-1+% OUT K1 -8 ; Internal offset=+25mV -1+% Oscillator Section SR witching Frequency =0 230K / Per phase 10 8 20 0 2z 2 kH OSC Se witching Frequency Range P0 er phas 10 0 5z 0 kH o o T0 emperature Stability C < T < 85C5+% /- A NOTE : 1) Guaranteed by design, not tested in production. Specifications subject to change without notice.  2005 Semtech Corp. 3 www.semtech.com SC2642 POWER MANAGEMENT Electrical Characteristics (Cont.) o Unless specified: V = 12V, VID=1.50V (101110,VRD10), F = 200kHz/phase, T = 27 C. See Typical Application Circuit. CC OSC A Ps arameter Tn est Condition Mp i Tx y Ms a Unit Voltage Error Amplifier Input Offset Voltage +V /- 3 m Input Bias Current 2A 5 n OV pen Loop Gain 1V <<0 4V 8B d ERROUT UC nity Gain Bandwidth =0 10pF 1z MH ERROUT Slew Rate 1/ 0 V µS Transconductance Gain 0V .5 mA/ Clamp level for OCP 4V .4 Clamp level Accuracy -8 8 +% Current Sense Amplifiers Input Offset Voltage +V /- 3 m Input Bias Current 5A 0 n Gain 1V 0 V/ CV MRR 00 to 3 8B d Input Common Mode Range -3 0.3 V Gain Match 2% Bandwidth 6z MH Droop Amplifier Gain 5V .4 V/ (1) Gain Accuracy +% /- 5 VIDs I] nput low voltage threshold [2 VID0:5 1V . I] nput high voltage threshold [8 VID0:51V . BV ias current [0 VID0:4] = 0 15 2 10 8 2A 5 u V5 ID5 pull up voltage for VRD/VRM10 V8 ID 15 . 2V . V5 ID5 pull up voltage for VRM9.X V4 ID 6 V V5 ID5 pull up voltage for K-8 V8 ID VV CC Power Good Threshold Rising V0 ID - Power Good Threshold20 5 30 5 4V 0 m Threshold Falling V5 ID - Power Good Threshold 5V 7 m OV utput High Leakage Pwrgood = 1A 00 n CC OV utput Low Sink P2 wrgood = 0.8 mA Current Limit Section Shutdown Voltage V0 ID - Shut Down Threshold 50 5 60 5 7V 5 m NOTE : 1) Guaranteed by design, not tested in production. Specifications subject to change without notice.  2005 Semtech Corp. 4 www.semtech.com SC2642 POWER MANAGEMENT Pin Configurations Ordering Information Top View Pe art NumberPT ackag Temp. Range ( ) J (1) O SC2642TSTRT5 SSOP-20 0 to 12 C (1)(2) O SC2642TSTRTT5 SSOP-20 0 to 12 C Sd C2642EVB Evaluation Boar Note: (1) Only available in tape and reel packaging. A reel contains 2500 devices. (2) Lead free package. Device is fully WEEE and RoHS compliant. (20-Pin TSSOP) Pin Descriptions Pe in#Pn in Nam Pin Functio 11O. S Current sense input 1 2TB. GOU BG reference pin. Connect soft start cap to AGND 3T ERROU Error-amplifier output. Connect compensation network to AGND. 4E GSENS Remote sense for GND. Rout with FB trace as a differnetial pair to the CPU socket. 5BF. Feedback pin 6P DACSTE VID step speed setting. Connect a cap to AGND to program the DAC slew rate. 7CV. C Power supply for chip 84V. ID VID MSB 93 VID 12 0 VID 11 1 VID 10 2V. ID VID LSB 15 3 VID 12.5mV bit for VR10. VID5 pull-up to VCC for K-8; VID5 pull-up to 5V for VRM9.X. 1D 4P. GOO Power good. Open Collect output 1F 5O. SCRE Oscillator frequency setting. Connect a resistor to AGND 1D 6A. GN Clean ground for analog signals 11 7O. UT PWM output1 12 8O. UT PWM output2 1N 9O. UTSE Direct output sense 22 0O. S Current sense input 2  2005 Semtech Corp. 5 www.semtech.com SC2642 POWER MANAGEMENT Block Diagram C/A1 1 + OS1 DRV1 PWM1 OUT + - OUT R Q 17 OUT1 C/A2 - S 20 + OS2 DRV2 PWM2 OUT + - OUT R Q 18 OUT2 OUTSEN - S 19 OUTSEN Errout OSCILLATOR Ramp CLOCK DIVIDER 15 ROSC OSCREF OSC CLK P1 P2 12 11111 VID0 INHIBIT DAC 11 VID1 2R VID0 10 VID1 VID2 VID2 VDAC - VID3 2R 9 VID4 OUT VID3 VID5 + 8 R VID4 13 VID5 VBG PWR_GOOD 6 + 14 DACSTEP PGOOD OUT OUTSEN Power Good Threshold DROOP - R + 0 OUT - E/A ERROUT 5 - FB R R OUT 3 ERROUT + R OCP & BGOUT SHUTDOWM - 0 2 OUT BGOUT BUFFER + 7 VCC VCC BANDGAP UVLO & VCC VREF 16 LATCH AGND BGOUT 4 GSEN GSENSE VBG  2005 Semtech Corp. 6 www.semtech.com Shut Down SC2642 POWER MANAGEMENT Applications Information- Output Voltage VRM9.X Output Voltage o Vout Unless specified: 0 = GND; 1 = High (or Floating). T = 25 C, V = 12V A CC (V) V3 ID4 V2 ID V1 ID V0 ID VID 1 1 1 1 1 OFF 1 1 1 1 0 1.1 1 1 1 0 1 1.125 1 1 1 0 0 1.15 1 1 0 1 1 1.175 1 1 0 1 0 1.2 1 1 0 0 1 1.225 1 1 0 0 0 1.25 1 0 1 1 1 1.275 1 0 1 1 0 1.3 1 0 1 0 1 1.325 1 0 1 0 0 1.35 1 0 0 1 1 1.375 1 0 0 1 0 1.4 1 0 0 0 1 1.425 1 0 0 0 0 1.45 0 1 1 1 1 1.475 0 1 1 1 0 1.5 0 1 1 0 1 1.525 0 1 1 0 0 1.55 0 1 0 1 1 1.575 0 1 0 1 0 1.6 0 1 0 0 1 1.625 0 1 0 0 0 1.65 0 0 1 1 1 1.675 0 0 1 1 0 1.7 0 0 1 0 1 1.725 0 0 1 0 0 1.75 0 0 0 1 1 1.775 0 0 0 1 0 1.8 0 0 0 0 1 1.825 0 0 0 0 0 1.85  2005 Semtech Corp. 7 www.semtech.com SC2642 POWER MANAGEMENT Applications Information- Output Voltage (Cont) VRD10 Output Voltage o Vout Unless specified: 0 = GND; 1 = High. T = 25 C, V = 12V A CC (V) V4 ID5 V3 ID V2 ID V1 ID V0 ID VID 0 0 1 0 1 0 0.8375 1 0 1 0 0 1 0.8500 0 0 1 0 0 1 0.8625 1 0 1 0 0 0 0.8750 0 0 1 0 0 0 0.8875 1 0 0 1 1 1 0.9000 0 0 0 1 1 1 0.9125 1 0 0 1 1 0 0.9250 0 0 0 1 1 0 0.9375 1 0 0 1 0 1 0.9500 0 0 0 1 0 1 0.9625 1 0 0 1 0 0 0.9750 0 0 0 1 0 0 0.9875 1 0 0 0 1 1 1.0000 0 0 0 0 1 1 1.0125 1 0 0 0 1 0 1.0250 0 0 0 0 1 0 1.0375 1 0 0 0 0 1 1.0500 0 0 0 0 0 1 1.0625 1 0 0 0 0 0 1.0750 0 0 0 0 0 0 1.0875 1 1 1 1 1 1 OFF 0 1 1 1 1 1 OFF 1 1 1 1 1 0 1.1000 0 1 1 1 1 0 1.1125 1 1 1 1 0 1 1.1250 0 1 1 1 0 1 1.1375 1 1 1 1 0 0 1.1500 0 1 1 1 0 0 1.1625 1 1 1 0 1 1 1.1750 0 1 1 0 1 1 1.1875 1 1 1 0 1 0 1.2000 0 1 1 0 1 0 1.2125 1 1 1 0 0 1 1.2250 0 1 1 0 0 1 1.2375 1 1 1 0 0 0 1.2500 0 1 1 0 0 0 1.2625 1 1 0 1 1 1 1.2750 0 1 0 1 1 1 1.2875 1 1 0 1 1 0 1.3000 0 1 0 1 1 0 1.3125 1 1 0 1 0 1 1.3250 0 1 0 1 0 1 1.3375 1 1 0 1 0 0 1.3500 0 1 0 1 0 0 1.3625 1 1 0 0 1 1 1.3750 0 1 0 0 1 1 1.3875 1 1 0 0 1 0 1.4000 0 1 0 0 1 0 1.4125 1 1 0 0 0 1 1.4250 0 1 0 0 0 1 1.4375 1 1 0 0 0 0 1.4500 0 1 0 0 0 0 1.4625 1 0 1 1 1 1 1.4750 0 0 1 1 1 1 1.4875 1 0 1 1 1 0 1.5000 0 0 1 1 1 0 1.5125 1 0 1 1 0 1 1.5250 0 0 1 1 0 1 1.5375 1 0 1 1 0 0 1.5500 0 0 1 1 0 0 1.5625 1 0 1 0 1 1 1.5750 0 0 1 0 1 1 1.5875 1 0 1 0 1 0 1.6000  2005 Semtech Corp. 8 www.semtech.com SC2642 POWER MANAGEMENT Applications Information- Output Voltage (Cont) K-8 Output Voltage o Unless specified: 0 = GND; 1 = High (or Floating). T = 25 C, V = 12V A CC V3 ID4 V2 ID V1 ID V0 ID VV ID (V) OUT 00000 1.550 0000 1 1.525 000 1 0 1.500 000 11 1.475 00 1 0 0 1.450 00 1 0 1 1.425 00 11 0 1.400 00 111 1.375 0 1 000 1.350 01 0 0 1 1.325 01 01 0 1.300 01 01 1 1.275 01 1 0 0 1.250 01 1 0 1 1.225 0 111 0 1.200 0 1111 1.175 1 0000 1.150 1 000 1 1.125 10 0 1 0 1.100 10 0 1 1 1.075 10 10 0 1.050 10 10 1 1.025 10 1 1 0 1.000 1 0 111 0.975 11 000 0.950 11 00 1 0.925 11 0 1 0 0.900 11 0 1 1 0.875 111 00 0.850 111 0 1 0.825 1111 0 0.800 11111 OFF  2005 Semtech Corp. 9 www.semtech.com SC2642 POWER MANAGEMENT Outline Drawing - TSSOP-20 DIM ENSIO NS A INCHES MILLIMETERS DIM D e MIN NO M M AX MIN NO M M AX A - - .047 - - 1.20 N A1 .002 - .006 0.05 - 0.15 - - A2 .031 .042 0.80 1.05 2X E/2 - - b .007 .012 0.19 0.30 c - - .003 .007 0.09 0.20 E1 D .251 .2 5 5 .259 6.40 6.50 6.60 E E1 .169 .1 7 3 .177 4.30 4.40 4.50 PIN 1 E .252 B S C 6 .4 0 BSC INDICATO R e .026 B S C 0 .6 5 BSC L .018 .0 2 4 .030 0.45 0.60 0.75 (.039) (1 .0 ) ccc C 1 2 3 L1 e/2 N 20 20 2X N /2 TIP S 01 0° - 8° 0° - 8° B aaa .0 0 4 0.10 bbb .0 0 4 0.10 ccc .0 0 8 0.20 D aaa C A2 A S EATIN G PLANE H C A1 bxN c bbb C A-B D GAGE PLANE 0.25 L 01 (L1 ) DETAIL A SE E D E T AIL A SID E V IEW NO TES: 1. C O NT RO L L IN G DIM E NS IO NS A R E IN M IL L IM E T E RS (A NG L E S IN D E G R E E S ). 2. D A T U M S -A - A N D -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 - 3. DIM E N S IO N S "E 1 " A N D "D " D O N O T INCL UDE M O L D F L A S H, P R O T RU S IO N S O R G A T E B U RRS . 4. R E F E R E N C E J E D E C ST D M O -1 5 3 , VAR IA T IO N AC . Land Pattern - TSSOP-20 X D IM ENSIO NS DIM INCHES MILLIM ETERS C (.222) (5.65) (C ) G .161 4.10 G Z P .026 0.65 X .016 0.40 Y .061 1.55 Y Z .283 7.20 P NOTES: 1. T H IS L A ND P A T T E R N IS F O R R E F E RE NCE P URP O S E S O N L Y . CO N S U L T Y O U R M A NU F A C T URIN G G R O U P T O E N S URE Y O UR C O M P AN Y 'S M A N U F A C T U R IN G G U ID EL IN ES AR 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  2005 Semtech Corp. 10 www.semtech.com