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POWER MANAGEMENT Description
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. 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.
Multi-Platform Two-Phase PWM Controller
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.
SC2642
Features
! ! ! ! ! ! ! ! ! ! ! ! ! ! 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
! ! ! ! Voltage Regulator VRD10.x Voltage Regulator VRM9.X Voltage Regulator K-8 High Current, Low Voltage Step Down DC/DC Converters
April 22, 2005
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VIN ATX12V 2 640nH D1 C2 R1 1R0 M3 U1 1uF D1N4148 C3 R2 100 10 9 8 7 6 5 4 3 2 1 VIN 1800uF/16V 1800uF/16V 4.7uF/1206 1nF + + M1 M2 BG2 VIN2 VR EG2 VPN2 BST1 CO1 TG1 PGND D RN1 NC C4 C5 C7 C1 4.7uF ATX12V 1 L1 VPN2 VIN
4.7uF/1206
1800uF/16V
C8
C6
+
M4
SC1214
PN2 L2 DR N2 VPN 1 BST2 VIN1 VOUT CO2 TG2 NC R3 11 12 13 14 15 16 17 IR0 VREG1 2 1
PN1 PGN D
L3 BG1
1
2
VOUT
R4 18 19 20
IR0 M7 VIN R6 C13 100 1nF C12 4.7uF VPN1 R7 M8
Note (1)
M5 M6 C9 2.2nF R5 C11 1R0 D2
+ COUT1
C10
2.2nF
PGND
1uF D1N4148
VPN1 VPN2
VOUT
0R0
Note (1)
C14 R10
R8 R9
C15 C16 R11
R13
VRM_EN
U2 R14 1.5K 20 1 OS2 OS1 2 R15 C18 1uF OFFSET+ R17 OFFSETC19 5 ATX12V R18 VCC 6 7 3 C20 0.1uF 4 BGOUT ERROUT GNDSEN FB DACSTEP VCC 10 C21 9 4.7uF 8 VID4 VID3 OUTSEN OUT2 OUT1 AGND OSCREF VID5 PGOOD VID0 VID1 VID2 19 18 17 16 ROSC1 15 13 14 12 11 10
(Ope n Col lector/Drai n Input, No Pull -u p)
VCC R16
Pull-up Voltage VR10: 2V VRM9.x: 5V K-8: 12V
POWER MANAGEMENT Typical Application Circuit
Use the same power source as FET driver
VID5
VID0
SC2642
DIFFERENTIAL PAIR FOR REMOTE SENSE
V_COREV_CORE+
VID1
VID2
VID3
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.
2005 Semtech Corp.
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SC2642
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 Supply Voltage Combi-Sense/Direct Output Voltage VID pins except VID5,Frequency pin Ground sense All other pins Ambient Temperature Range Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering) 10 Sec.
Symbol VCC OS1, OS2, OUTSEN VID0 ~ VID4,OSCREF GSENSE
Maximum 20 5 7 -0.3 to 0.3 Vcc + 0.3
Units V V V V V
o
TA TJ TSTG TLEAD
0 to 105 0 to 125 -65 to +150 260
C C C C
o
o
o
Electrical Characteristics
Unless specified: VCC = 12V, VID=1.50V (101110,VRD10), FOSC = 200kHz/phase, TA = 27 C. See Typical Application Circuit.
o
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
7.5
12 10 7.3
14 13 7.5
V mA V V
6.4
6.6
VBGOUT
CBGOUT = 4.7nF
2.945 220
2.990 300 0.5 1 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
Oscillator Section Switching Frequency Switching Frequency Range Temperature Stability ROSC = 230K / Per phase Per phase 0oC < TA < 85oC 180 100 +/ - 5 200 220 500 kHz kHz %
NOTE : 1) Guaranteed by design, not tested in production. Specifications subject to change without notice.
2005 Semtech Corp.
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SC2642
POWER MANAGEMENT Electrical Characteristics (Cont.)
Unless specified: VCC = 12V, VID=1.50V (101110,VRD10), FOSC = 200kHz/phase, 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 Droop Amplifier Gain Gain Accuracy(1) 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 Power Good Threshold Rising Threshold Falling Output High Leakage Output Low Sink Current Limit Section Shutdown Voltage
Test Conditions
Min
Typ
Max
Units
+/ - 3 25 1V < VERROUT < 4V CERROUT = 10pF 80 10 10 0.5 4.4 -8 +8
mV nA dB MHz V/S mA/V V %
+/ - 3 50 10 0 to 3V -0.3 2 6 80 3
mV nA V/V dB V % MHz
5.4 +/ - 5
V/V %
[VID0:5] [VID0:5] [VID0:4] = 0V VID5 VID5 VID5 1.8 120 1.8 4 8 185
1.2
V V
250 2.5 6 VCC
uA V V V
VID - Power Good Threshold VID - Power Good Threshold Pwrgood = VCC Pwrgood = 0.8V
250
350 575 100
400
mV mV nA mA
2
VID - Shut Down Threshold
550
650
750
mV
NOTE : 1) Guaranteed by design, not tested in production. Specifications subject to change without notice.
2005 Semtech Corp.
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SC2642
POWER MANAGEMENT Pin Configurations
Top View
Ordering Information
Part Number SC2642TSTR
(1)
Package TSSOP-20 TSSOP-20
Temp. Range (TJ) 0 to 125 OC 0 to 125 OC
SC2642TSTRT(1)(2) 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# 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Pin Name OS1 BGOUT ERROUT GSENSE FB DACSTEP VCC VID4 VID3 VID2 VID1 VID0 VID5 PGOOD OSCREF AGND OUT1 OUT2 OUTSEN OS2 VID LSB. 12.5mV bit for VR10. VID5 pull-up to VCC for K-8; VID5 pull-up to 5V for VRM9.X. Power good. Open Collect output. Oscillator frequency setting. Connect a resistor to AGND. Clean ground for analog signals. PWM output1. PWM output2. Direct output sense. Current sense input 2. Current sense input 1. BG reference pin. Connect soft start cap to AGND. Error-amplifier output. Connect compensation network to AGND. Remote sense for GND. Rout with FB trace as a differnetial pair to the CPU socket. Feedback pin. VID step speed setting. Connect a cap to AGND to program the DAC slew rate. Power supply for chip. VID MSB. Pin Function
2005 Semtech Corp.
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SC2642
POWER MANAGEMENT Block Diagram
C/A1
OS1 1 + OUT +
PWM1
OUT R S Q
DRV1 17 OUT1
C/A2
OS2 20 + OUT
+
PWM2
OUT R S Q
DRV2 18 OUT2
OUTSEN
OUTSEN 19
-
OSCILLATOR Ramp OSCREF 15 ROSC OSC
Errout
CLOCK DIVIDER CLK P1 P2
VID0 VID1 VID2 VID3 VID4 VID5 DACSTEP
12
DAC
Shut D ow n 11 10 9 8 13 6 VID0 VID1 VID2 VID3 VID4 VID5
11111 INHIBIT
2R
VDAC -
2R
+
OUT
R VBG
PWR_GOOD
+ 14 OUT PGOOD
OUTSEN
+
DROOP
OUT -
R
Power Good Threshold
-
0
FB
5
-
E/A
OUT
ERROUT
3 ERROUT
R
R
+
R BGOUT
BGOUT 2 OUT -
OCP & SHUTDOWM
0
BUFFER
VCC
+ 7 VCC
BANDGAP
VCC VREF GSEN
UVLO & LATCH
VBG BGOUT
16
AGND
GSENSE
4
2005 Semtech Corp.
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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 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
2005 Semtech Corp.
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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 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 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
2005 Semtech Corp.
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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 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 VID 3 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 VID 2 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 VID 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 VID 0 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
2005 Semtech Corp.
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SC2642
POWER MANAGEMENT Outline Drawing - TSSOP-20
A e N 2X E /2 E1 P IN 1 IN D IC A T O R ccc C 2 X N /2 T IP S 123 e /2 B E D
D IM
A A1 A2 b c D E1 E e L L1 N 01 aaa bbb ccc
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
aaa S E A T IN G P LA N E
C
D A2 A H C A -B D GAGE PLANE 0 .2 5 (L 1 ) S E E D E T A IL L c
C bxN bbb
A1
01
S ID E V IE W
A
D E T A IL
A
NOTES: 1. 2. 3. 4. 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 ). DATUM S -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 -
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. 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 .
Land Pattern - TSSOP-20
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 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
Y 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

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