SC2642 Multi-Platform Two-Phase PWM Controller POWER MANAGEMENT Description The VID structure of the SC2642 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. The SC2642 provides microprocessor core voltage regulation solution with two paralleled PWM channels. 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 SC2642 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 SC2642 is its voltage regulation accuracy. Not only it provides better than 1% 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-SenseTM topology is employed by SC2642. The MOSFET Rds(on) and the output inductor winding resistance are used to generate the phase current information. The Combi-SenseTM MOSFET driver plus the SC2642 enables the complete solution. ! ! ! The SC2642 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 SC2642 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. April 22, 2005 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 SC1211 Under Voltage Protection Built in External programmable Soft-Start Externally programmable switching frequency (up to 1MHz output ripple frequency) Applications ! ! ! ! 1 Voltage Regulator VRD10.x Voltage Regulator VRM9.X Voltage Regulator K-8 High Current, Low Voltage Step Down DC/DC Converters www.semtech.com SC2642 POWER MANAGEMENT Typical Application Circuit ATX12V 1 C5 1800uF/16V + L2 1 L1 640nH C15 4.7uF/1206 C7 PN2 IR0 R3 C9 2.2nF R14 1.5K 2 M1 VIN M5 VPN1 R8 C18 1uF R11 10 R18 R15 C19 V_COREV_CORE+ M2 M6 C16 C20 0.1uF VCC C3 1nF 100 R2 VPN2 R5 C14 1R0 R9 OS2 VID3 VID4 VCC DACSTEP FB GNDSEN ERROUT BGOUT OS1 C17 20 9 8 7 6 5 4 3 2 1 R12 VPN2 C21 4.7uF C11 C1 4.7uF VIN D2 U2 OUT2 OUT1 AGND OSCREF VID5 PGOOD VID0 VID1 VID2 10 11 12 14 13 15 16 17 18 19 1uF D1N4148 R10 VOUT 8 OUTSEN R13 SC2642 6 ATX12V C4 2 Note (1) + 1800uF/16V VOUT VRM_EN R17 OFFSET- (Ope n Col lector/Drai n Input, No Pull -u p) VCC R16 OFFSET+ ATX12V Use the same power source as FET driver DIFFERENTIAL PAIR FOR REMOTE SENSE Note (2) SC1214 Notes: (1) Output filter design: Please follow guidelines issued by Intel and AMD . (2) Please follow the guidelines issued by Intel and AMD. D1 D1N4148 VIN ROSC1 C2 1R0 R1 C12 4.7uF R6 100 C13 1nF VPN1 U1 1uF D RN1 PGN D 2 TG1 M3 M7 VIN M4 M8 R7 0R0 C8 4.7uF/1206 PN1 R4 IR0 C10 2.2nF Pull-up Voltage VR10: 2V VRM9.x: 5V K-8: 12V + L3 1800uF/16V C6 1 2 VOUT + COUT1 PGND Note (1) VID5 VID0 VID1 VID2 VID3 VID4 Note (2) PWRGOOD (Open Collector Output) www.semtech.com 2 2005 Semtech Corp. BST1 VREG1 1 20 BG1 19 CO1 4 VIN1 17 NC 3 18 VIN2 CO2 5 VPN 1 16 VPN2 NC 15 BG2 TG2 7 14 VR EG2 BST2 13 10 PGND 9 12 DR N2 11 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 Symbol Maximum Units VCC 20 V Combi-Sense/Direct Output Voltage OS1, OS2, OUTSEN 5 V VID pins except VID5,Frequency pin VID0 ~ VID4,OSCREF 7 V GSENSE -0.3 to 0.3 V Vcc + 0.3 V Supply Voltage Ground sense All other pins 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 260 o C C C C Electrical Characteristics o Unless specified: VCC = 12V, VID=1.50V (101110,VRD10), FOSC = 200kHz/phase, TA = 27 C. See Typical Application Circuit. Parameter Symbol Test Conditions Min Typ Max Units 7.5 12 14 V 10 13 mA 7.3 7.5 V Chip_Supply IC Supply Voltage VCC IC Supply Current ICC UVLO Ramp Up UVLO Ramp Down 6.4 6.6 V 2.945 2.990 3.035 V 220 300 330 µA Reference Section Bandgap Output VBGOUT CBGOUT = 4.7nF Source Current VCC = 10.0V ~ 14.0V 0.5 mV/V 0oC < TA < 85oC 1 % VID Step VRM9.X, K-8, LSB 25 mV VID Step VRD/VRM10, LSB 12.5 mV Supply Rejection Temperature Stability Voltage Accuracy VOUT VRD10 ; Internal offset=-20mV -0.5 +0.5 % VRM9.x ; Internal offset=-20mV -1 +1 % K-8 ; Internal offset=+25mV -1 +1 % 220 kHz 500 kHz Oscillator Section Switching Frequency Switching Frequency Range Temperature Stability ROSC = 230K / Per phase 180 Per phase 100 0oC < TA < 85oC 200 +/ - 5 % 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: VCC = 12V, VID=1.50V (101110,VRD10), FOSC = 200kHz/phase, TA = 27 C. See Typical Application Circuit. Parameter Test Conditions Min Typ Max Units Voltage Error Amplifier Input Offset Voltage +/ - 3 mV 25 nA 1V < VERROUT < 4V 80 dB CERROUT = 10pF 10 MHz Slew Rate 10 V/µS Transconductance Gain 0.5 mA/V Clamp level for OCP 4.4 V Input Bias Current Open Loop Gain Unity Gain Bandwidth Clamp level Accuracy -8 +8 % Current Sense Amplifiers Input Offset Voltage +/ - 3 mV Input Bias Current 50 nA Gain 10 V/V 80 dB CMRR 0 to 3V Input Common Mode Range -0.3 3 V Gain Match 2 % Bandwidth 6 MHz 5.4 V/V +/ - 5 % Droop Amplifier Gain Gain Accuracy(1) VIDs Input low voltage threshold [VID0:5] Input high voltage threshold [VID0:5] 1.8 [VID0:4] = 0V 120 VID5 pull up voltage for VRD/VRM10 VID5 VID5 pull up voltage for VRM9.X VID5 pull up voltage for K-8 Bias current 1.2 V V 185 250 uA 1.8 2.5 V VID5 4 6 V VID5 8 VCC V Threshold Rising VID - Power Good Threshold 250 400 mV Threshold Falling VID - Power Good Threshold 575 mV Pwrgood = VCC 100 nA Power Good Output High Leakage Output Low Sink Pwrgood = 0.8V 2 VID - Shut Down Threshold 550 350 mA Current Limit Section Shutdown Voltage 650 750 mV 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 Part Number (1) SC2642TSTR SC2642TSTRT(1)(2) Package Temp. Range (TJ) TSSOP-20 0 to 125 OC TSSOP-20 0 to 125 OC SC2642EVB Evaluation Board 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 Pin# Pin Name 1 OS1 2 BGOUT BG reference pin. Connect soft start cap to AGND. 3 ERROUT Error-amplifier output. Connect compensation network to AGND. 4 GSENSE Remote sense for GND. Rout with FB trace as a differnetial pair to the CPU socket. 5 FB 6 DACSTEP 7 VCC Power supply for chip. 8 VID4 VID MSB. 9 VID3 10 VID2 11 VID1 12 VID0 VID LSB. 13 VID5 12.5mV bit for VR10. VID5 pull-up to VCC for K-8; VID5 pull-up to 5V for VRM9.X. 14 PGOOD Power good. Open Collect output. 15 OSCREF Oscillator frequency setting. Connect a resistor to AGND. 16 AGND Clean ground for analog signals. 17 OUT1 PWM output1. 18 OUT2 PWM output2. 19 OUTSEN 20 OS2 2005 Semtech Corp. Pin Function Current sense input 1. Feedback pin. VID step speed setting. Connect a cap to AGND to program the DAC slew rate. Direct output sense. Current sense input 2. 5 www.semtech.com SC2642 POWER MANAGEMENT Block Diagram C/A1 OS1 + 1 OUT + - OUT C/A2 OS2 20 DRV1 PWM1 R 17 OUT1 18 OUT2 S - + + OUT DRV2 PWM2 OUT - OUTSEN R OUTSEN Q Q S 19 Errout OSCILLATOR Ramp OSCREF 15 VID0 12 CLOCK DIVIDER ROSC OSC VID2 10 VID3 9 VID0 VID1 VID2 VID3 VID4 VID5 Shut D ow n 11 P1 P2 11111 INHIBIT DAC VID1 CLK 2R VDAC - 2R OUT + VID4 8 VID5 13 DACSTEP 6 R VBG PWR_GOOD + 14 PGOOD 3 ERROUT 7 VCC 16 AGND OUT OUTSEN DROOP Power Good Threshold R + - 0 OUT - FB - 5 R R E/A ERROUT OUT + OCP & SHUTDOWM R BGOUT BGOUT 2 - 0 OUT BUFFER + VCC BANDGAP VCC GSENSE 4 2005 Semtech Corp. UVLO & LATCH VREF GSEN VBG 6 BGOUT www.semtech.com SC2642 POWER MANAGEMENT Applications Information- Output Voltage VRM9.X Output Voltage Unless specified: 0 = GND; 1 = High (or Floating). TA = 25oC, VCC = 12V 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 2005 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 SC2642 POWER MANAGEMENT Applications Information- Output Voltage (Cont) VR D 10 Output Voltage Unless speci fi ed: 0 = GND ; 1 = Hi gh. TA = 25oC , VCC = 12V VID 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 2005 Semtech Corp. VID 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 VID 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 VID 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 VID 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 VID 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 Vout (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 OFF OFF 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 SC2642 POWER MANAGEMENT Applications Information- Output Voltage (Cont) K -8 Output Voltage Unless speci fi ed: 0 = GND ; 1 = Hi gh (or Floati ng). TA = 25oC , VCC = 12V 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 2005 Semtech Corp. 9 www.semtech.com SC2642 POWER MANAGEMENT Outline Drawing - TSSOP-20 A D IM D e A A1 A2 b c D E1 E e L L1 N 01 aaa bbb ccc N 2X E /2 E1 E P IN 1 IN D IC A T O R ccc C 2 X N /2 T IP S 1 2 3 e /2 B aaa S E A T IN G P LA N E D IM E N S IO N S M IL L IM E T E R S IN C H E S M I N N O M M A X M IN N O M M A X .0 0 2 .0 3 1 .0 0 7 .0 0 3 .2 5 1 .1 6 9 .0 4 7 .0 0 6 .0 4 2 .0 1 2 .0 0 7 .2 5 9 .2 5 5 .1 7 7 .1 7 3 .2 5 2 B S C .0 2 6 B S C .0 3 0 .0 1 8 .0 2 4 (.0 3 9 ) 20 0° 8° .0 0 4 .0 0 4 .0 0 8 0 .0 5 0 .8 0 0 .1 9 0 .0 9 6 .4 0 4 .3 0 1 .2 0 0 .1 5 1 .0 5 0 .3 0 0 .2 0 6 .5 0 6 .6 0 4 .4 0 4 .5 0 6 .4 0 B S C 0 .6 5 B S C 0 .4 5 0 .6 0 0 .7 5 (1 .0 ) 20 8° 0° 0 .1 0 0 .1 0 0 .2 0 D C A2 C A H A1 bxN bbb C A -B D c GAGE PLANE 0 .2 5 L 01 (L 1 ) S E E D E T A IL S ID E V IE W D E T A IL A 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 L E 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 C . -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-20 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 I L 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 I N G G U I D E L I N 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 2005 Semtech Corp. 10 www.semtech.com