SC1144 DESCRIPTION SC1144 high performance, multi-phase (PWM
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PROGRAMMABLE, HIGH PERFORMANCE MULTI-PHASE, CONTROLLER
SC1144
DESCRIPTION
SC1144 high performance, multi-phase (PWM) controller designed high power microprocessors requiring ultra fast transient response, such Pentium beyond. Utilizing novel unique design, controller distributes output load across four converter channels digitally phase shifting outputs. This approach greatly reduces stress heat output stage components while lowering input ripple current much 80%. Accurate current sharing among four phases achieved precision design techniques trimming critical elements. high speed transconductance error amplifier externally initialized using soft-start capacitor allowing controller "wake-up" without overshoot, thus protecting voltage microprocessor loads. output drive voltage power MOSFETs programmable minimize switching losses drive circuitry. floating feedback ground allows remote sense capability. output voltage digitally programmable means DAC. single resistor programs master clock frequency (8MHz max) controller synchronized using external oscillator. number operating phases programmed independently external clock. parts features under-voltage lock-out with hysteresis overcurrent protection.
FEATURES Allows small surface mount components Ultra fast transient recovery time Wide, High frequency operating range Selectable phase operation Floating feedback ground remote sensing Precision load current sharing Selectable internal external clock Soft start, Over current protection 5-bit programmable output programmable clock, 200Khz-2Mhz phase APPLICATIONS High servers workstations High current/Ultra-fast transient microprocessors Voltage Regulator Modules ORDERING INFORMATION
DEVICE
PACKAGE SO-24
TEMP. (TJ) 85°C
SC1144ABCSW
Note: suffix `TR' tape reel.
BLOCK DIAGRAM
CONFIGURATION
View
(24-Pin SOIC)
SC1144 patent pending
Pentium registered trademark Intel Corporation
1999 SEMTECH CORP.
MITCHELL ROAD NEWBURY PARK 91320
PROGRAMMABLE, HIGH PERFORMANCE MULTI-PHASE, CONTROLLER
SC1144
ABSOLUTE MAXIMUM RATINGS
Parameter VCC5V VCC12V Operating Temperature Range Junction Temperature Range Storage Temperature Range Thermal Resistance Junction Case Thermal Resistance Junction Ambient Lead Temperature (Soldering) Symbol Vcc5v Vcc12v TSTG TLEAD Limits -0.3 -0.3 +125 +150 Units °C/W °C/W
ELECTRICAL CHARACTERISTICS
Unless otherwise noted: 25°C, 12V, 4-Phase operation. PARAMETER Supply Voltage Range UVLO Range UVLO Hystersis UVLO Range UVLO Hystersis Supply Voltage Range Supply Current Supply Current Reference Current Voltage Vid0-4 Clock Select Divide Select Logic Threshold Vid0-4 Clock Select Divide Select Input Bias Current Enable SYMBOL VCC12V VCC5V VCC5V VCC12V VCC12V VCC5V VCC12V VCC5V VREF VINL VINH IINL IINH VINL VINH DRV0-3 Output Voltage DRV0-3 Source Current DRV0-3 Sink Current ISRC ISNK Isink Isource=1ma,OUTV=Vcc12 VOUT 2.00V VOUT 2.00V VCC12 Outputs open VOUT 2.00V, Iref 250µA Logic Logic High Vid0-4=0V Vid0-4=4.5V 2.05 CONDITIONS 10.0 12.0 14.0 UNITS
SC1144 patent pending
MITCHELL ROAD NEWBURY PARK 91320
1999 SEMTECH CORP.
PROGRAMMABLE, HIGH PERFORMANCE MULTI-PHASE, CONTROLLER
SC1144
ELECTRICAL CHARACTERISTICS (Cont.)
Unless otherwise noted: 25°C, VCC5V VCC12V 12V, 4-Phase operation. PARAMETER Bgout Voltage Bgout Impedance External Clock Freq. Range Oscillator Frequency Accuracy Internal Clock Freq. Range Match DRV0-3 Time Drive Voltage Range Overcurrent Comparator, Comparator, Common Mode Range OC+I/P bias Current OC-I/P bias Current Input Offset Voltage Feedback Input Impedance Maximum Duty Cycle Mimimum Duty Cycle SYMBOL VBgout RO_Bg Fext_CK FOSC Fint_CK Toff OutV OCC_CMR Output Freq. 2MHz/Phase 2.000V Duty cycle deviation from Avg. Iref 250µA CONDITIONS 00000 2.05 UNITS
IB_OC+ IB_OCVOS_OCC Ri_FB Dmax Dmin
5V,Roc+<20Kohm 5V,Roc-<20Kohm 2.00V FB=0V FB=4.0V
+250 +250
CONVERTER SPECIFICATIONS, Reference Application Circuit Output Accuracy Over Range Load Regulation VOUT
VOUT VOUT
0000-1111 VCC5V 5.0V 2.000V VCC5V 2.000V 4-6V, (vin separated from Vcc5v) external
.025
Line Regulation
SC1144 patent pending
MITCHELL ROAD NEWBURY PARK 91320
1999 SEMTECH CORP.
PROGRAMMABLE, HIGH PERFORMANCE MULTI-PHASE, CONTROLLER
SC1144
DESCRIPTION
Divsel Clksel Extclk Name Function Supply voltage input nominal) Connect four phase operation logic High three Phase operation. Clock Select: Logic high selects internal clock. Logic selects external clock. External Clock Input. output frequency determined (Clock Input Freq.)/4. Output freq.= (Clock Input)/4. Pull Vcc5v select internal clock. Connects external reference resistor. Sets operating frequency internal clock ramp time PWM. Reference voltage this 2.05V. Trimmed 250µA 8MHz.
RREF
VID0 VID1 VID2 VID3
Programming Input (LSB) Programming Input Programming Input Programming Input Programming Input (MSB) Over current comparator. Non-Inverting input. Over current comparator. Inverting input. Compensation Pin. Compensation acheived connecting capacitor series with resistor between this FBG. 300k resistor must also directly connected between this FBG. Feedback input connected supply output. Bandgap Reference Output. Output resistance=3kohm. Must bypassed with 4.7nf -100nf capacitor FBG. This capacitor programs soft start time. Feedback Ground. This must connected return side output caps. This floating, (within diode drop pin). Connects enable. Connect disable entire device. Ground Phase output Phase output Supply voltage Drivers/DRV0-3 Phase output Phase output Sets maximum DRV0-3 drive voltage order reduce switching losses external MOSFETs.
VID4
COMP
BGOUT
ENABLE DRV2 DRV0 VCC12V DRV1 DRV3 OutV
NOTE: logic inputs outputs open collector compatible.
SC1144 patent pending
MITCHELL ROAD NEWBURY PARK 91320
1999 SEMTECH CORP.
PROGRAMMABLE, HIGH PERFORMANCE MULTI-PHASE, CONTROLLER
SC1144
OUTPUT VOLTAGE
Unless specified: GND; High Floating). 25°C, VCC5V VCC12V 12V, 4-Phase operation.
PARAMETER Output Voltage
43210 01111 01110 01101 01100 01011 01010 01001 01000 00111 00110 00101 00100 00011 00010 00001 00000 11111 11110 11101 11100 11011 11010 11001 11000 10111 10110 10101 10100 10011 10010 10001 10000
1.287 1.336 1.386 1.435 1.485 1.534 1.584 1.633 1.683 1.732 1.782 1.831 1.881 1.930 1.980 2.029 1.980 2.079 2.178 2.277 2.376 2.475 2.574 2.673 2.772 2.871 2.970 3.069 3.168 3.267 3.366 3.465
1.300 1.350 1.400 1.450 1.500 1.550 1.600 1.650 1.700 1.750 1.800 1.850 1.900 1.950 2.000 2.050 2.000 2.100 2.200 2.300 2.400 2.500 2.600 2.700 2.800 2.900 3.000 3.100 3.200 3.300 3.400 3.500
1.313 1.364 1.414 1.465 1.515 1.566 1.616 1.667 1.717 1.768 1.818 1.869 1.919 1.970 2.020 2.071 2.020 2.121 2.222 2.323 2.424 2.525 2.626 2.727 2.828 2.929 3.030 3.131 3.232 3.333 3.434 3.535
SC1144 patent pending
MITCHELL ROAD NEWBURY PARK 91320
1999 SEMTECH CORP.
SC1144 patent pending
.008 300nH Vcc5V 22u,10V 1u,10V 22u,10V Clksel 2222 Extclk 300nH 2907 22u,10V 1u,10V 22u,10V 2222 Vid2 Enable 2907 Vid4 2222 OCComp 8.2k .01u 300k .022 Ext. Load 2907 MBRD835 300nH 22u,10V Bgout 1u,10V 22u,10V 20N03 22u,10V 22u,10V MBRD835 22u,10V 20N03 22u,10V MBRD835 22u,10V Vcc12V 20N03 VOUT 22u,10V Drv1 22u,10V MBRD835 22u,10V Outv 2907 2222 20N03 Divsel Drv3 Rref Drv0 Vid0 SC1144-SOIC Drv2 Vid1 300nH 22u,10V Vid3
2.7k
.001
PROGRAMMABLE, HIGH PERFORMANCE MULTI-PHASE, CONTROLLER
OUTPUT VOLTAGE SENSE
Vout=1.3-3.5Volts Iout=0-25Amps
Title SC1144 Application Circuit Size Date: Document Number {Doc} Wednesday, January 1999 Sheet {RevCode}
Ceramic Surface Mount (1210) Caps
1999 SEMTECH CORP.
1u,10V
1000UF
TYPICAL APPLICATION CIRCUIT
VID0
VID1
VID2
VID3
VID4
MITCHELL ROAD NEWBURY PARK 91320
SC1144
B120 B119 B118 B117 B116 B115 B114 B113 B112 B111 B110 B109 B108 B107 B106 B105 B104 B103 B102 B101 B100 VOUT
VID[0] VID[3] $PIN238 VCC_L2 $PIN236 $PIN235 $PIN234 VCC_L2 $PIN232 $PIN231 $PIN230 VCC5 $PIN228 $PIN227 $PIN226 VCC_CORE $PIN224 $PIN223 $PIN222 $PIN221 $PIN220 $PIN219 $PIN218 VCC_CORE $PIN216 $PIN215 $PIN214 VCC_CORE $PIN212 $PIN211 $PIN210 VCC_CORE $PIN208 $PIN207 $PIN206 VCC_CORE $PIN204 $PIN203 $PIN202 $PIN201 $PIN200 $PIN199 $PIN198 VCC_CORE $PIN196 $PIN195 $PIN194 VCC_CORE $PIN192 $PIN191 $PIN190 VCC_CORE $PIN188 $PIN187 $PIN186 VCC_CORE $PIN184 $PIN183 $PIN182 $PIN181 $PIN180 $PIN179 $PIN178 VCC_CORE $PIN176 $PIN175 $PIN174 VCC_CORE $PIN172 $PIN171 $PIN170 VCC_CORE $PIN168 $PIN167 $PIN166 VCC_CORE $PIN164 $PIN163 $PIN162 $PIN161 $PIN160 $PIN159 $PIN158 VCC_CORE $PIN156 $PIN155 $PIN154 VCC_CORE $PIN152 $PIN151 $PIN150 VCC_CORE $PIN148 $PIN147 $PIN146 VCC_CORE $PIN144 $PIN143 $PIN142 $PIN141 $PIN140 $PIN139 $PIN138 VCC_CORE $PIN136 $PIN135 $PIN134 VCC_CORE $PIN132 $PIN131 $PIN130 VCC_VTT $PIN128 $PIN127 $PIN126 VCC_VTT $PIN124 $PIN123 $PIN122 $PIN121
VID[1] VID[2] $PIN116 $PIN115 $PIN114 $PIN112 $PIN111 $PIN110 $PIN108 $PIN107 $PIN106 $PIN104 $PIN103 $PIN102 $PIN100 $PIN99 $PIN98 $PIN96 $PIN95 $PIN94 $PIN92 $PIN91 $PIN90 $PIN88 $PIN87 $PIN86 $PIN84 $PIN83 $PIN82 $PIN80 $PIN79 $PIN78 $PIN76 $PIN75 $PIN74 $PIN72 $PIN71 $PIN70 $PIN68 $PIN67 $PIN66 $PIN64 $PIN63 $PIN62 $PIN60 $PIN59 $PIN58 $PIN56 $PIN55 $PIN54 $PIN52 $PIN51 $PIN50 $PIN48 $PIN47 $PIN46 $PIN44 $PIN43 $PIN42 $PIN40 $PIN39 $PIN38 $PIN36 $PIN35 $PIN34 $PIN32 $PIN31 $PIN30 $PIN28 $PIN27 $PIN26 $PIN24 $PIN23 $PIN22 $PIN20 $PIN19 $PIN18 $PIN16 Reserved THERMTRIP# TESTHI PWRGOOD IGNNE# FERR# A20M# IERR# VCC_VTT VCC_VTT
A120 A119 A118 A117 A116 A115 A114 A113 A112 A111 A110 A109 A108 A107 A106 A105 A104 A103 A102 A101 A100
1999 SEMTECH CORP.
SC1144 patent pending
EVALUATION BOARD SCHEMATIC
PROGRAMMABLE, HIGH PERFORMANCE MULTI-PHASE, CONTROLLER
MITCHELL ROAD NEWBURY PARK 91320
SC1144
B121 VCC_L2 A121 VID[4] VID1 VID2 VID3 VID4 .01u 8.2k SC1144ABCSW OCComp Vid4 Vid3 Vid2 Vid1 Vid0 Drv2 Enable Bgout SEL. 300k VOUT 4.75k .01u 22u,10V 1u,10V 22u,10V FMMT718 835L 300nh 22u,10V 22u,10V 835L IRF7811 22u,10V 300nh 22u,10V 22u,10V FMMT618 1u,10V 22u,10V FMMT718 835L IRF7811 22u,10V 300nh 22u,10V FMMT618
INPUT
1u,10V 1u,10V 1u,10V
VID0 Vout/Clk switch 1u,10V 22u,10V
1000UF 100UF 100UF
vcc5v
10uf
Extclk Clksel Vcc12v Drv1 FMMT618 VOUT 22u,10V IRF7811
Rref Drv0 FMMT718
Divsel Drv3
R21R25R26
835L
vcc5v
Vcc5v Long Trace Outv 3.24k FMMT618 FMMT718 IRF7811 300nh
22u,10V
1u,10V 22u,10V
1u,10V
22u,10V
470uF,opt.
Title
Size
Req'd Freq.<1MHZ/phase +12V Input operation
Date:
1u,16V 1u,16V
Document Number
SC1144_EVB
1u,16V
SC1144evb1 Evaluation Board
Wednesday, July 1999
Sheet
PentiumII
PROGRAMMABLE, HIGH PERFORMANCE MULTI-PHASE, CONTROLLER
BILL MATERIAL Item Reference C27,C31 C29,C28 D1,D2,D3,D4 L1,L2,L3,L4 L1,L2,L3,L4 Q1,Q4,Q7,Q10 Q2,Q5,Q8,Q11 Q3,Q6,Q9,Q12 R2,R9 R3,R5,R6,R8,R19,R20 R13,R14,R15,R16 R21,R22,R25,R26 Value 1u,10V 22u,10V .01u 100UF, 6.3v 10uf, 6.3v .001 .01u 1000UF, 6.3v 835L INPUT 300nH, 8Amp 450nH, 8Amp 300nH, 6Amp FMMT618 20N03HL FMMT718 8.2k 2.32k 1/4W, 1206 300k 4.75k Manufacturer
SC1144
(818)883-7606 Murata (512)250-5082 #GRM235Y5V226Z010 AVX,Murata,Nichicon Murata,Al. Elec. Murata,Al. Elec. Murata Murata Murata,Al. Elec. Murata,X7R Motorola
Falco (305)662-7276 #T025A2 TO25O2 Steward DI2220V301R-00 Zetex Motorola Zetex Dale,any Dale Dale
Vout/Clk switch (800)cal-swch SC1144ABCSW PentiumII conn. Semtech (805)498-2111 Foxconn (714)256-1880
Unless otherwise noted, resistors 1/10W, 0805 capacitors 20%, 50v, 0805.
SC1144 patent pending
MITCHELL ROAD NEWBURY PARK 91320
1999 SEMTECH CORP.
PROGRAMMABLE, HIGH PERFORMANCE MULTI-PHASE, CONTROLLER
SC1144
THEORY OPERATION
FUNCTIONAL DESCRIPTION SC1144 programmable, high performance, multi-phase controller designed most demanding DC/DC converter applications which transient response, space, input ripple current component form factor cost paramount. SC1144 based dc/dc converter consists four asynchronous converters. gate drives converters alternated sequentially SC1144 allowing equal sharing load current among stages. high clock frequency allows smaller inductor value miniature surface mount, inductance output capacitors. Since each stage output current, conduction losses each stage reduced factor 1/16. Precision active trimming ensures matching duty cycles among phases, thus ensuring heat component stress shared equally. This allows lower cost components each phase virtual elimination heat sinks. time. ramps then compared error amplifier output high speed comparator inputs. oscilator master clock frequency programmed follows: Clock Freq=(8.2K/Rref)*8Mhz
Fig. four Gate Drives firing phase. VOUT 2.0V, IOUT ERROR AMPLIFIER heart controller ultra-fast, transconductance error amplifier. Since output inductor values selected minimum, usually less than micro-Henry, delays inductor ramp time minimized during transient load recovery. higher frequency operation also allows much smaller capacitance output. This means that dc/dc converter output capacitors "hold Time" less. error amplifier must therefore respond extremely fast "Recover Fort" after transient. SC1144 error amplifier recovers normal duty cycle after application full load transient within usec maximum, (largely dependant input output capacitance) usually within 1usec. This minimizes undershoot overshoot during application transient. Operation high frequency minimizes output inductor thus allowing faster current ramp output capacitors. effective gain error amplifier stays constant both ranges, keeping loop gain constant regardless output voltage range.
Fig. VOUT Ripple, VOUT 2.0V, IOUT DECODER/BIAS GENERATOR/PWM CONTROLLER clock divided down four phase operation clock decoder. start output pulses time shifted degrees decoder with respect each other. Bias Generator generates ramps each phase precision trimmed current source on-chip capacitors. decoder, which synchronized bias generator master clock, phase shifts ramps enables controller sequentially. resistor from RREF programs frequency ramp
SC1144 patent pending
MITCHELL ROAD NEWBURY PARK 91320
1999 SEMTECH CORP.
PROGRAMMABLE, HIGH PERFORMANCE MULTI-PHASE, CONTROLLER
Preliminary August 1999 ERROR AMPLIFIER CONT.
SC1144
application power, non-inverting input error amplifier held short time allowing decoder controller settle. This prevents harmful output voltage overshoots upon start after converter shut-down result over-current enable pulled low). non-inverting input then ramps according time constant allowing gradual rise output voltage. ISOLATED FEEDBACK GROUND feedback ground SC1144, FBG, isolated from GND. maximum voltage between pins diode forward voltage drop. This allows SC1144 configured remote sensing thus compensating wiring connector voltage drops high currents during transients. Remote sensing typically implemented using differential amplifiers. this feature SC1144 eliminates need additional components. OVER-CURRENT COMPARATOR SC1144 internal over-current comparator designed sense current input supply path. comparator inputs have high common voltage range thus allowing operation under possible voltage/current combinations. output comparator pulls BGOUT (soft start) thus disabling error amplifier causing outputs enter minimum duty cycle mode. SYNCHRONOUS ASYNCHRONOUS MODE SC1144 configured drive Synchrounous MSOFET drivers, such SC1405 higher efficiency. Refer SC1405 datasheet example designs. COMPONENT SELECTION LAYOUT CONSIDERATIONS Care must taken component selection layout high frequency power appliactions. Refer SC1144EVB user manual more application information component selection layout guidlines well example Artwork Bill materials.
Fig. Transient response, trace, Current sense 8A/div 30A/usec. Bottom trace, VOUT.
Fig. Trace, Gate drive responding removal transient load. Bottom trace, Load current transient 16A/div. BANDGAP REFERENCE/SOFT START precision internal bandgap reference provides stable, temperature compensated 2.05 reference error amplifier's non-inverting input, DACREF digital analog converter, under-voltage lock-out circuitry well reference Bias generator current sources. error amplifiers noninverting input connected bandgap reference through kohm resistor, which also externally connected soft-start capacitor BGOUT pin. Upon
SC1144 patent pending
MITCHELL ROAD NEWBURY PARK 91320
1999 SEMTECH CORP.
PROGRAMMABLE, HIGH PERFORMANCE MULTI-PHASE, CONTROLLER
SC1144
evaluation board available which ordered directly from factory. SC1144EVB DC/DC converter utilizing SC1144 four-phase controller asynchronous appliaction. SC1144-SYNCH-EVB utilizes SC1405 high speed MOSFET drivers drive Synchronous MOSFETs with enhanced features. evaluation boards intended guidelines board design, layout assess performance parameters, such transient response, thermal stress management input output ripple considerations. SC1144EVB includes SLOT1 connector Pentium switch mode/voltage selection well qualified selection components SC1144 operation. SC1144EVB user manual contains useful applications information. Both Evaluation boards ordered from website www.semtech.com.
OUTLINE DRAWING SO-24
JEDEC MS-013AD B17104B
SC1144 patent pending
MITCHELL ROAD NEWBURY PARK 91320
1999 SEMTECH CORP.
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