SC2643VX Multi-Platform Multi-Phase PWM Controller POWER MANAGEMENT Description The SC2643VX provides a solution for microprocessor core voltage regulation with up to 4 paralleled PWM channels. The solution can also be configured as 2, 3, or 4-phase form. This multi-phase buck regulator utilizes the phaseshift 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. 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) Features To satisfy the highly dynamic nature of the modern microprocessors, the SC2643VX 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 2.8MHz. One of the outstanding features of the SC2643VX is its voltage regulation accuracy. Not only does it provide better than 0.5% set point accuracy, but also the accuracy to be fully compliant with 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 SC2643VX. 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 SC2643VX enables the complete solution. VRD/VRM10.X, 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 Under Voltage Protection Built in External programmable Soft-Start Externally programmable switching frequency (up to 2.8MHz output voltage ripple frequency) 2, 3, or 4-Phase Configurations Applications The SC2643VX is a multi-platform controller. It conforms to Intel VRM/VRD10.X, VRM9.X, and AMD K-8 (OpteronTM) VID specifications. With very minor changes of the schematic and the layout, the SC2643VX based solution can be ported form one platform to another. This greatly benefits system manufactures by reducing design cycle times and streamlining inventory management. Voltage Regulator VRD/VRM10.X Voltage Regulator VRM9.X Voltage Regulator K-8 High Current, Low Voltage Step Down DC/DC Converters The SC2643VX 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 May 11, 2005 1 www.semtech.com SC2643VX POWER MANAGEMENT Typical Application Circuit ATX12V Note (3) VRM_EN R15 OFFSET+ ATX12V R13 1.5K R16 OFFSET- (Open Collector Input, No Pull-up) VCC Note (4) C6 1 4.7uF C21 C16 1uF R7 R2 AUX1 10 R20 R14 C17 Pull-up Voltage VR10: 2V VRM9.x: 5V K-8: 12V L1 640nH C7 2 VCC R8 R3 AUX2 C18 0.1uF C8 VIN C4 13 14 15 16 17 18 19 20 21 22 23 24 R10 R5 VOUT OS4 C9 OUTSEN OUT3 OS3 OUT2 OS2 BGOUT OUT1 OUT4 ERROUT AGND OSCREF VID5 PGOOD VID1 VID0 VCC VID2 VID3 VID4 DACSTEP FB GNDSEN OS1 U2 R9 R4 AUX3 1 2 3 4 5 6 7 8 9 10 11 12 Note (2) DIFFERENTIAL PAIR FOR REMOTE SENSE SC2643VX V_COREV_CORE+ PWRGOOD (Open Collector Output) Rosc VCC Output filter design: Please follow guidelines issued by Intel and AMD. Please follow guidelines issued by Intel and AMD. Open collector/drain input, no pull-up. Use the same power source as FET driver’s (SC1211). ATX12V Note (2) VID0 VID1 VID2 VID3 VID4 VID5 Notes: (1) (2) (3) (4) R1 2R2 AUX3 AUX2 AUX1 PN3 PN2 PN1 C5 1nF R12 100 C19 1nF R19 100 C27 1nF R23 100 D1N4148 D1 1uF C3 PGND 4.7uF C12 C13 C11 D2 1uF 1uF D1N4148 PGND D1N4148 D3 1uF C22 1uF C24 4.7uF C23 PGND 1uF C29 4.7uF C30 U1 9 9 U3 9 U4 R6 1 R17 1 R21 1 M2 M5 M8 M4 M1 M3 VIN M6 VIN M7 M9 C2 4.7uF/1206 PN3 R11 IR0 C10 2.2nF PN2 C15 4.7uF/1206 R18 IR0 C20 2.2nF C26 4.7uF/1206 PN1 R22 IR0 C28 2.2nF 1800uF/16V C1 + 1800uF/16V C14 + 1800uF/16V C25 + R24 0R0 1 1 1 L2 L3 L4 2 2 2 VOUT + Cout PGND Note (1) www.semtech.com 2 2005 Semtech Corp. SC1211 4 3 2 1 CO BST TG DRN VPN V IN VR EG BG 5 6 7 8 SC 1211 4 3 2 1 CO BST TG DRN VPN V IN VR EG BG 5 6 7 8 SC 1211 4 3 2 1 CO BST TG DRN VPN V IN VR EG BG 5 6 7 8 SC2643VX 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. Unless otherwise specified, all other voltages are referenced to AGND. Parameter Symbol Maximum Units VCC -0.3 to 20 V OS1, OS2, OS3, OS4, OUTSEN 5 V VID0 ~ VID4 7 V VID5 -0.3 to VCC+0.3 V OUT1, OUT2, OUT3, OSCREF 7 V Ground Sense GSENSE -0.3 to +0.3 V All Other Pins OUT4, FB, DACSTEP -0.3 to VCC+0.3 V Thermal Resistance of Junction to Case θJC 15.6 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 VCC Supply Voltage Combi-Sense/Direct Output Voltage VID Pins Except VID5 VID5 Oscillator Frequency Setting and OUT Pins C/W o C C C C Electrical Characteristics o Unless specified: VCC = 12V, 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 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 Vcc Rising UVLO Ramp Down UVLO Vcc Falling 6.4 6.5 VBGOUT CBGOUT = 4.7nF 2.945 2.990 3.035 V 220 300 330 µA V Reference Section Bandgap Output Source Current VCC = 10.0V ~ 14.0V 0.5 mV/V 0oC < TA < 85oC 0.5 % VID Step VRM9.X, K-8, LSB 25 mV VID Step VRD/VRM10, LSB 12.5 mV Supply Rejection Temperature Stability Voltage Accuracy 2005 Semtech Corp. VOUT VRD10 ; Internal offset=-20mV -0.5 +0.5 % VRM9.x ; Internal offset=-20mV -1 +1 % K-8 ; Internal offset=+25mV -1 +1 % 3 www.semtech.com SC2643VX POWER MANAGEMENT Electrical Characteristics (Cont.) o Unless specified: VCC = 12V, 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 Voltage Error Amplifier Input Offset Voltage ±3 mV Input Bias Current 25 nA 1V < VERROUT < 4V 80 dB CERROUT = 10pF 10 MHz 10 V/µs GEA 0.5 mA/V VeoMAX 4.4 V Open Loop Gain Unity Gain Bandwidth Slew Rate Transconductance Gain Clamp Level for OCP Clamp Level Accuracy -8 +8 % Current Sense Amplifiers Input Offset Voltage ±3 mV Input Bias Current 50 nA 10 V/V 80 dB Gain GCA CMRR 0 to 3V Input Common Mode Range -0.3 3 V Gain Match 2 % Bandwidth 6 MHz Power Good Threshold for Vcore Rising VID - Power Good Threshold Threshold for Vcore Falling VID - Power Good Threshold 575 mV Pwrgood = VCC 100 nA Output High Leakage Output Low Sink Pwrgood = 0.8V 250 350 400 2 mV mA 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 2005 Semtech Corp. 4 1.2 V 250 µA 1.8 2.5 V VID5 4 6 V VID5 8 Vcc V 185 www.semtech.com SC2643VX POWER MANAGEMENT Electrical Characteristics (Cont.) o Unless specified: VCC = 12V, 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 Oscillator Frequency FOSC ROSC = 309K 540 600 660 kHz Oscillator Frequency Range FOSC 2800 kHz Oscillator Section 330 Temperature Stability ±5 0oC < TA < 85oC % 3-Phase Operation Output 4 pull up Threshold For 3-phase operation 3.5 4 4.5 V Droop Amplifier Gain GDA Gain Accuracy(1) 5.4 V/V ±5 % Current Limit Section Shutdown Voltage VID - Shut Down Threshold 550 650 750 mV Dynamic VID Section Sinking Current of DACSTEP IDAC_SINK 390 uA Sourcing Current of DACSTEP IDAC_SRC 340 uA NOTES: 1) Guaranteed by design, not tested in production. Specifications subject to change without notice. 2005 Semtech Corp. 5 www.semtech.com SC2643VX POWER MANAGEMENT Pin Configurations Ordering Information Top View 1 2 3 4 5 6 7 8 9 10 11 12 OS3 OS2 OS1 BGOUT ERROUT GSENSE FB DACSTEP VCC VID4 VID3 VID2 Part Number 24 23 22 21 20 19 18 17 16 15 14 13 OS4 OUTSEN OUT4 OUT3 OUT2 OUT1 AGND OSCREF PGOOD VID5 VID0 VID1 SC2643VXTSTR (1) SC2643VXTSTRT (1)(2) Package Temp. Range (TJ) TSSOP-24 0 to 125 OC TSSOP-24 0 to 125 OC SC2643VXEVB Evaluation Board Note: (1) Only available in tape and reel packaging. A reel contains 2500 devices for the TSSOP-24 package. (2) Lead free package.Device is fully WEEE and RoHS compliant. (24-Pin TSSOP) Pin Descriptions Pin# Pin Name 1 OS3 Combi-SenseCurrent 3. 2 OS2 Combi-Sense Current 2. Connect to OUTSEN for 2 phase operation 3 OS1 Combi-Sense Current 1. 4 BGOUT 5 ERROUT Error-amplifier output. 6 GSENSE Remote sense for GND. 7 FB 8 DACSTEP 9 VCC Pow er supply for chip. 10 VID4 VID MSB. 11 VID3 12 VID2 13 VID1 14 VID0 VID LSB. 15 VID5 VID 1/2 LSB / VID type select. VID5 pull-up to VCC for K-8; VID5 pull-up to 5V for VRM9.X. 16 PGOOD Pow er good. 17 OSCREF Oscillator frequency setting. 18 AGND Clean ground for analog. 19 OUT1 PWM output1. 20 OUT2 PWM output2. 21 OUT3 PWM output3. 22 OUT4 PWM output4. Connect to VCC for 3 phase operation. 23 OUTSEN 24 OS4 2005 Semtech Corp. Pin Function BG reference pin. Feedback pin. VID step speed. Direct output sense. Combi-Sense Current 4. Connect to OUTSEN for 2 or 3 phase operation. 6 www.semtech.com SC2643VX POWER MANAGEMENT Block Diagram C/A1 + 3 OS1 + OUT PWM1 C/A2 + OUT PWM2 19 OUT1 20 OUT2 21 OUT3 22 OUT4 DRV2 OUT C/A3 Q S - R - Q S + 1 OS3 R - + 2 OS2 DRV1 OUT - + OUT PWM3 DRV3 OUT - C/A4 R - Q S + OS4 24 + OUT PWM4 OUTSEN DRV4 OUT - R - Q S OUTSEN 23 Errout OSCILLATOR Ramp CLOCK DIVIDER ROSC OSCREF 17 OSC CLK SEL3 VID1 13 VID2 12 VID3 11111 INHIBIT 14 DAC VID0 VID1 VID2 VID3 VID4 VID5 11 VID4 10 VID5 15 DACSTEP 8 Shut Down VID0 + OUT 3 PHASE SELECT 2R VDAC P1 P2 P3 P4 - 3/4 Phase selection Threshold - 2R OUT + R VBG PWR_GOOD + 16 PWRGD 5 ERROUT 9 VCC 18 AGND OUT OUTSEN DROOP Power Good Threshold R + - OUT 7 FB - R R E/A ERROUT OUT + R BGOUT BGOUT 4 OUT BUFFER + VCC BANDGAP VCC GNDSEN 6 2005 Semtech Corp. OCP & SHUTDOWM - GSEN UVLO & LATCH VREF VBG 7 BGOUT www.semtech.com SC2643VX POWER MANAGEMENT Applications Information- Output Voltage VRM9.X Output Voltage Unless specified: 0 = GND; 1 = High (or Floating). TA = 25°C, 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 8 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 SC2643VX POWER MANAGEMENT Applications Information- Output Voltage (Cont) VRD10 Output Voltage Unless specified: 0 = GND; 1 = High. TA = 25°C, VCC = 12V VID5 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. VID4 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 VID3 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 VID2 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 9 VID1 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 VID0 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 SC2643VX POWER MANAGEMENT Applications Information- Output Voltage (Cont) K-8 Output Voltage Unless specified: 0 = GND; 1 = High (or Floating). TA = 25°C, VCC = 12V VID4 VID3 VID2 VID1 VID0 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. 10 www.semtech.com SC2643VX POWER MANAGEMENT Outline Drawing - TSSOP-24 A DIM D e A A1 A2 b c D E1 E e L L1 N 01 aaa bbb ccc N 2X E/2 E1 E PIN 1 INDICATOR ccc C 2X N/2 TIPS 1 2 3 e/2 B .047 .002 .006 .031 .042 .007 .012 .003 .007 .303 .307 .311 .169 .173 .177 .252 BSC .026 BSC .018 .024 .030 (.039) 24 0° 8° .004 .004 .008 1.20 0.15 0.05 1.05 0.80 0.19 0.30 0.09 0.20 7.70 7.80 7.90 4.30 4.40 4.50 6.40 BSC 0.65 BSC 0.45 0.60 0.75 (1.0) 24 0° 8° 0.10 0.10 0.20 D aaa C SEATING PLANE DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX A2 A C H A1 bxN bbb c GAGE PLANE C A-B D 0.25 L (L1) SIDE VIEW SEE DETAIL DETAIL A 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 MO-153, VARIATION AD. Land Pattern - TSSOP-24 X DIM (C) G Z Y C G P X Y Z DIMENSIONS INCHES MILLIMETERS (.222) .161 .026 .016 .061 .283 (5.65) 4.10 0.65 0.40 1.55 7.20 P NOTES: 1. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY. CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR COMPANY'S MANUFACTURING GUIDELINES ARE MET. 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. 11 www.semtech.com