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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. 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. 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. 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
Multi-Platform Multi-Phase PWM Controller
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)
SC2643VX
Features
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
Voltage Regulator VRD/VRM10.X Voltage Regulator VRM9.X Voltage Regulator K-8 High Current, Low Voltage Step Down DC/DC Converters
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SC2643VX
VIN ATX12V 1 2 R1 D1 C3 1uF U1 4 3 2 1 PN3 R6 9 PGND VPN V IN VR EG BG 1 M2 M3 R11 IR0 C10 5 6 7 8 2.2nF OS4 OUTSEN OUT4 OUT3 OUT2 OUT1 AGND OSCREF PGOOD VID5 VID3 12 VID2 VID0 VID1 19 18 17 16 15 VID4 14 13 R19 100 Rosc AUX2 1nF PN2 C19 4 3 2 1 PN2 CO BST TG DRN R17 20 21 D1N4148 1uF M4 22 23 VCC 24 C11 1uF D2 C12 4.7uF VIN C13 M1 D1N4148 PN3 R2 R3 R4 C4 R5 C5 1nF C9 R10 R12 100 U2 1 C6 R7 C7 R8 C8 R9 AUX3 CO BST TG DRN 2R2 AUX1 AUX2 AUX3 VOUT 640nH ATX12V L1
1800uF/16V
C2 4.7uF/1206
C1 +
1
L2
2
Note (3)
2 OS2 OS1 BGOUT ERROUT GNDSEN FB DACSTEP VCC R13 4 1.5K 5 R14 R16 OFFSETC17 8 9 10 R20 11 10 C21 4.7uF C16 1uF C18 0.1uF VCC 7 6 VCC R15 3 VRM_EN
OS3
SC1211
(Open Collector Input, No Pull-up)
1800uF/16V
C15 4.7uF/1206
C14 +
OFFSET+
Note (4)
ATX12V
SC 1211
1 PGND VPN V IN VR EG BG 9 1 M5 U3 5 6 7 8 M6 R18 IR0 C20 2.2nF
L3
2
VOUT
+ Cout
Note (2)
VID0 VID1 VID2 VID3 VID4
SC2643VX
C22 1uF D3 D1N4148 V_CORE-
C23 4.7uF C24 1uF M7 VIN
PGND
1800uF/16V
C26 4.7uF/1206
C25 +
POWER MANAGEMENT Typical Application Circuit
Pull-up Voltage VR10: 2V VRM9.x: 5V K-8: 12V
VID5
AUX1 1nF
SC 1211
C27
CO BST TG DRN
V_CORE+
DIFFERENTIAL PAIR FOR REMOTE SENSE
PN1
4 3 2 1
PN1 R21 9 VPN V IN VR EG BG 1
1
L4
2
Note (2)
R23 100
PGND
R22 M8 U4 5 6 7 8 M9 IR0 C28 2.2nF C29 PWRGOOD (Open Collector Output) 1uF C30 4.7uF
Note (1)
R24
0R0
Notes: (1) (2) (3) (4)
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).
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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 VCC Supply Voltage Combi-Sense/Direct Output Voltage VID Pins Except VID5 VID5 Oscillator Frequency Setting and OUT Pins Ground Sense All Other Pins Thermal Resistance of Junction to Case Ambient Temperature Range Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering) 10 Sec.
Symbol VCC OS1, OS2, OS3, OS4, OUTSEN VID0 ~ VID4 VID5 OUT1, OUT2, OUT3, OSCREF GSENSE OUT4, FB, DACSTEP JC TA TJ TSTG TLEAD
o
Maximum -0.3 to 20 5 7 -0.3 to VCC+0.3 7 -0.3 to +0.3 -0.3 to VCC+0.3 15.6 0 to 105 0 to 125 -65 to 150 260
Units V V V V V V V
o
C/W
o o o o
C C C C
Electrical Characteristics
Unless specified: VCC = 12V, VID=1.30V (110110,VRD10) or 1.50V (101110,VRD10), FOSC = 600kHz, TA = 27 C. See Typical Application Circuit.
Parameter Chip_Supply IC Supply Voltage IC Supply Current UVLO Ramp Up UVLO Ramp Down Reference Section Bandgap Output Source Current Supply Rejection Temperature Stability VID Step VID Step
Symbol
Test Conditions
Min
Typ
Max
Units
VCC ICC UVLO UVLO Vcc Rising Vcc Falling
7.5
12 10 7.3
14 13 7.5
V mA V V
6.4
6.5
VBGOUT
CBGOUT = 4.7nF
2.945 220
2.990 300 0.5 0.5 25 12.5
3.035 330
V A mV/V % mV mV
VCC = 10.0V ~ 14.0V 0oC < TA < 85oC VRM9.X, K-8, LSB VRD/VRM10, LSB VRD10 ; Internal offset=-20mV -0.5 -1 -1
+0.5 +1 +1
% % %
Voltage Accuracy
VOUT
VRM9.x ; Internal offset=-20mV K-8 ; Internal offset=+25mV
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SC2643VX
POWER MANAGEMENT Electrical Characteristics (Cont.)
Unless specified: VCC = 12V, VID=1.30V (110110,VRD10) or 1.50V (101110,VRD10), FOSC = 600kHz, TA = 27 C. See Typical Application Circuit.
o
Parameter Voltage Error Amplifier Input Offset Voltage Input Bias Current Open Loop Gain Unity Gain Bandwidth Slew Rate Transconductance Gain Clamp Level for OCP Clamp Level Accuracy Current Sense Amplifiers Input Offset Voltage Input Bias Current Gain CMRR Input Common Mode Range Gain Match Bandwidth Power Good Threshold for Vcore Rising Threshold for Vcore Falling Output High Leakage Output Low Sink VIDs Input Low Voltage Threshold Input High Voltage Threshold Bias Current VID5 Pull-up Voltage for VRD/VRM10 VID5 Pull-up voltage for VRM9.X VID5 Pull-up voltage for K-8
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Symbol
Test Conditions
Min
Typ
Max
Units
3 25 1V < VERROUT < 4V CERROUT = 10pF 80 10 10 GEA VeoMAX -8 0.5 4.4 +8
mV nA dB MHz V/s mA/V V %
3 50 GCA 0 to 3V -0.3 2 6 10 80 3
mV nA V/V dB V % MHz
VID - Power Good Threshold VID - Power Good Threshold Pwrgood = VCC Pwrgood = 0.8V
250
350 575 100
400
mV mV nA mA
2
[VID0:5] [VID0:5] [VID0:4]=0V VID5 VID5 VID5
4
1.2 1.8 120 1.8 4 8 185 250 2.5 6 Vcc
V
A V V V
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SC2643VX
POWER MANAGEMENT Electrical Characteristics (Cont.)
Unless specified: VCC = 12V, VID=1.30V (110110,VRD10) or 1.50V (101110,VRD10), FOSC = 600kHz, TA = 27 C. See Typical Application Circuit.
o
Parameter Oscillator Section Oscillator Frequency Oscillator Frequency Range Temperature Stability 3-Phase Operation Output 4 pull up Threshold Droop Amplifier Gain Gain Accuracy(1) Current Limit Section Shutdown Voltage Dynamic VID Section Sinking Current of DACSTEP Sourcing Current of DACSTEP
Symbol
Test Conditions
Min
Typ
Max
Units
FOSC FOSC
ROSC = 309K
540 330
600
660 2800
kHz kHz %
0oC < TA < 85oC
5
For 3-phase operation
3.5
4
4.5
V
GDA
5.4 5
V/V %
VID - Shut Down Threshold
550
650
750
mV
IDAC_SINK IDAC_SRC
390 340
uA uA
NOTES: 1) Guaranteed by design, not tested in production. Specifications subject to change without notice.
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SC2643VX
POWER MANAGEMENT Pin Configurations
Top View
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 AG ND OSCREF PG D OO VID5 VID0 VID1
Ordering Information
Part Number SC2643VXTSTR
(1)
Package TSSOP-24 TSSOP-24
Temp. Range (TJ) 0 to 125 OC 0 to 125 OC
SC2643VXTSTRT (1)(2) 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# 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Pin Name OS3 OS2 OS1 BGOUT ERROUT GSENSE FB DACSTEP VCC VID4 VID3 VID2 VID1 VID0 VID5 PGOOD OSCREF AGND OUT1 OUT2 OUT3 OUT4 OUTSEN OS4 VID LSB. VID 1/2 LSB / VID type select. VID5 pull-up to VCC for K-8; VID5 pull-up to 5V for VRM9.X. Pow er good. Oscillator frequency setting. Clean ground for analog. PWM output1. PWM output2. PWM output3. PWM output4. Connect to VCC for 3 phase operation. Direct output sense. Combi-Sense Current 4. Connect to OUTSEN for 2 or 3 phase operation.
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Pin Function Combi-SenseCurrent 3. Combi-Sense Current 2. Connect to OUTSEN for 2 phase operation Combi-Sense Current 1. BG reference pin. Error-amplifier output. Remote sense for GND. Feedback pin. VID step speed. Pow er supply for chip. VID MSB.
2005 Semtech Corp.
SC2643VX
POWER MANAGEMENT Block Diagram
C/A1
OS1 3 + OUT +
PWM1
OUT R S Q
DRV1 19 OUT1
C/A2
OS2 2 + OUT -
+
PWM2
OUT R S Q
DRV2 20 OUT2
C/A3
OS3 1 + OUT -
+
PWM3
OUT R S Q
DRV3 21 OUT3
C/A4
OS4 24 + OUT
+
PWM4
OUT R S Q
DRV4 22 OUT4
OUTSEN
OUTSEN 23
-
OSCILLATOR Ramp OSCREF 17 ROSC OSC
Errout
CLOCK DIVIDER CLK SEL3 P1 P2 P3 P4 +
VID0 VID1 VID2 VID3 VID4 VID5 DACSTEP
14 13 12 11 10 15 8
DAC
Shut Down VID0 VID1 VID2 VID3 VID4 VID5
11111 INHIBIT
2R
VDAC
3 PHASE SELECT
OUT -
2R R VBG
OUT +
3/4 Phase selection Threshold
PWR_GOOD
+ 16 OUT PWRGD
OUTSEN
+
DROOP
OUT -
R
Power Good Threshold
-
FB
7
R
-
E/A
OUT
ERROUT
5 ERROUT
R
+
R BGOUT
BGOUT 4 OUT -
OCP & SHUTDOWM
BUFFER
VCC
+ 9 VCC
BANDGAP
VCC VREF GSEN
UVLO & LATCH
VBG BGOUT
18
AGND
GNDSEN
6
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SC2643VX
POWER MANAGEMENT Applications Information- Output Voltage
VRM9.X Output Voltage Unless specified: 0 = GND; 1 = High (or Floating). TA = 25C, 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 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 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
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SC2643VX
POWER MANAGEMENT Applications Information- Output Voltage (Cont) VRD10 Output Voltage
Unless specified: 0 = GND; 1 = High. TA = 25C, 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 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 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
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SC2643VX
POWER MANAGEMENT Applications Information- Output Voltage (Cont) K-8 Output Voltage
Unless specified: 0 = GND; 1 = High (or Floating). TA = 25C, VCC = 12V VID4 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 VID3 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 VID2 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 VID1 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 VID0 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 VOUT (V) 1.550 1.525 1.500 1.475 1.450 1.425 1.400 1.375 1.350 1.325 1.300 1.275 1.250 1.225 1.200 1.175 1.150 1.125 1.100 1.075 1.050 1.025 1.000 0.975 0.950 0.925 0.900 0.875 0.850 0.825 0.800 OFF
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SC2643VX
POWER MANAGEMENT Outline Drawing - TSSOP-24
A e N 2X E/2 E1 PIN 1 INDICATOR ccc C 2X N/2 TIPS 123 E D
DIM
A A1 A2 b c D E1 E e L L1 N 01 aaa bbb ccc
DIMENSIONS INCHES MILLIMETERS MIN NOM MAX MIN NOM MAX
.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
e/2 B
aaa C SEATING PLANE
D A2 A
C bxN bbb
A1 C A-B D GAGE PLANE 0.25
H c
L (L1) DETAIL
01
SIDE VIEW
SEE DETAIL
A
A
NOTES: 1. 2. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES). 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 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
Y 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
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