power Long Trace 100UF Programmable, High Performance Multi-Phase
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SC1144 high performance, multi-phase controller designed high power microprocessors requiring ultra fast transient response, such Pentium®ll beyond. Utilizing novel unique design, controller distributes output load equally across four converter channels digitally phase shifting outputs. This approach greatly reduces stress heat output stage components while lowering input output 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 asynchronous applications. 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 programmable independent clock. parts features under-voltage lock-out with hysteresis over-current protection.
power Long Trace 100UF
Programmable, High Performance Multi-Phase Controller
Features PRELIMINARY
Allows small surface mount components Ultra fast transient recovery time Wide frequency operating range,200Khz-2Mhz
SC1144
phase 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,VRM8.4 compatible output voltage accuracy programmable Overcurrent, Soft start drive voltage
Applications
High servers workstations High current/Ultra-fast transient microprocessors Voltage Regulator Modules
Typical Application Circuit
SS12 10uf,6.3v 1000uf Divsel Clksel Extclk Rref Vid0 Vid1 Vid2 Vid3 Vid4 OCOutv Drv3 Drv1 Drv0 Drv2 Enable Bgout Comp 2.2k 1u,16V VOUT
SS12
SS12
SS12 IRF7811
.6uh 1u,16V 10u,16V IRF7811 22u,10V FDB7030 22u,10V 22u,10V 22u,10V
PRDY DELAY_C OVP_S DSPS_DR S_MOD PGND
SC1405
+12V
1u,16V 10u,16V IRF7811 22u,10V 1u,16V FDB7030 .6uh 10u,16V IRF7811 FDB7030 1000uf .6uh 22u,10V 22u,10V FDB7030 22u,10V .6uh 22u,10V
Vid0 Vid1 Vid2 Vid3 Vid4
PRDY DELAY_C OVP_S DSPS_DR S_MOD PGND
SC1405
PRDY DELAY_C OVP_S DSPS_DR S_MOD PGND
SC1405
PRDY DELAY_C OVP_S DSPS_DR S_MOD PGND
VOUT,1.6V,50A
SC1144
.01u .022 300k
.001
Frequency:1Mhz/Phase
SC1405
Revision January 2001
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SC1144
POWER MANAGEMENT Absolute Maximum Ratings
Parameter VCC5V VCC12V Operati Temperature Range Juncti Temperature Range Storage Temperature Range Thermal Resi stance Juncti Thermal Resi stance Juncti Ambi Lead Temperature (Solderi Sec. mbol TSTG TLEAD Maximum -0.3 -0.3 +125 +150
PRELIMINARY
nits
Electrical Characteristics
Unless otherwise noted: 25°C, 12V, 4-Phase operation.
Parameter Supply Voltage Range UVLO Range UVLO Hysteresi UVLO Range UVLO Hysteresi Supply Voltage Range Supply urrent Supply urrent Reference urrent Voltage d0-4 lock Select Select Logi Threshold d0-4 lock Select Select Input urrent Enable RV0-3 Output Voltage
mbol VINL VINH IINL
onditions
10.0
12.0
14.0
nits
Outputs open VOUT 2.00V, Iref 250µA Logi Logi d0-4=0V d0-4=4.5V
2.05
IINH
VINL VINH
Isink =1mA Isource =1mA, OUTV=VCC12 VOUT 2.00V, VOUT 2.00V, 00000
VCC12-1
RV0-3 Source urrent RV0-3 urrent Bgout Voltage Bgout Impedance
2001 Semtech Corp.
ISRC ISINK VBgout
2.05
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SC1144
POWER MANAGEMENT Electrical Characteristics (Cont.)
Unless otherwise noted: 25°C, 12V. Reference: Application Circuit
PRELIMINARY
Parameter External lock Freq. Range Osci llator Frequency Accuracy Internal lock Freq. Range Match RV0-3 Voltage Range Overcurrent omparator, omparator, ommon Mode Range +I/P urrent -I/P urrent Input Offset Voltage Feedback Input Impedance Maxi umum ycle ycle
mbol Fext_CK FOSC Fint_CK Toff OutV
onditions
nits
Iref 250µA
cycle devi from Avg.
Output Freq. 2MHz V/Phase 2.000V
IB_OC IB_OC VOS_OC Roc+<20Kohm Roc=<20Kohm 2.00V FB=0V FB=4.0V
+250 +250
erter Specifications, eference Application ircuit Output Accuracy Over Range Load Regulati VOUT
VOUT
00000-11111 VCC5V 5.0V 2.000V VCC5V 2.000V 4-6V, separated from Vcc5v), lk=external
.025
Regulati
VOUT
2001 Semtech Corp.
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SC1144
POWER MANAGEMENT Configuration
View
Ordering Information
PRELIMINARY
Temp ange (TJ) 85°C
ackag SO-24
1144ABC SW.TR
Note: Only available tape reel packaging. reel contains 1000 devices.
(24-Pin SOIC) vsel lksel Extclk
Descriptions
Function
Supply voltage nput nomi nal) onnect logi four phase operati logi three Phase operati lock Select. Logi selects nternal clock. Logi selects external clock. External lock Input. output frequency determi lock Input Freq.)/4. Output freq. lock Input)/4. Pull Vcc5v select nternal clock. onnects external reference resi stor. Sets operati frequency nternal clock ramp PWM. Reference voltage 2.05V. mmed 250µA 8MHz. Programmi Input (LSB) Programmi Input Programmi Input Programmi Input Programmi Input (MSB) Over current comparator. Non-Inverti nput. Over current comparator. Inverti nput. ompensati ompensati achi eved connecti capaci seri resi stor between FBG. 300k resi stor must also rectly connected between FBG. Feedback nput connected supply output. Bandgap Reference Output. Output resi stance=3kohm. Must bypassed 4.7nf 100nf capaci FBG. capaci programs soft start Feedback Ground. must connected return output caps. floati drop onnects enable. onnect sable enti devi
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RREF 0(1) 1(1) 2(1) 3(1) 4(1) GOUT ENABLE
2001 Semtech Corp.
SC1144
POWER MANAGEMENT Descriptions (Cont.)
OutV Ground Phase output Phase output Supply voltage vers/D RV0-3 Phase output Phase output Sets maxi RV0-3 voltge order reduce tchi losses external MOSFETs. Function
PRELIMINARY
NOTE: inputs compatible internally pulled Vcc5V.
Block Diagram
2XW9
2001 Semtech Corp.
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SC1144
POWER MANAGEMENT Applications Information Output Voltage Table
Parameter Output Voltage onditions Vcc5v Vcc12V 12V, 43210 01111 01110 01101 01100 01011 01010 01001 01000 00111 00110 00101 00100 00011 00010 00001 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 10980 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 2.000 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
PRELIMINARY
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 2.020 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 nits
2001 Semtech Corp.
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SC1144
POWER MANAGEMENT Applications Information Output Voltage Table (Cont.)
FUNCTIONAL DESCRIPTION
PRELIMINARY
SC1144 programmable, high performance, multiphase controller designed most demanding converter applications which transient response, space, input ripple current component form factor cost paramount. SC1144 based dc/dc converter consists four synchronized 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.
master clock, phase shifts ramps enables controller sequentially. resistor from RREF programs frequency ramp time. ramps then compared error amplifier output high speed comparator inputs. oscillator 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.
Fig. VOUT Ripple, VOUT 2.0V, IOUT Decoder/Bias Generator/PWM controller (max) 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
2001 Semtech Corp.
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SC1144
POWER MANAGEMENT Applications Information Functional Description (Cont.)
effective gain error amplifier stays constant both ranges, keeping loop gain constant regardless output voltage range.
PRELIMINARY
error amplifiers non-inverting input, DACREF digital analog converter, under-voltage lockout circuitry well reference Bias generator current sources. error amplifiers non-inverting input connected bandgap reference through kohm resistor, which also externally connected soft-start capacitor BGOUT pin. Upon application power, non-inverting input error amplifier held short time allowing decoder controller settle. This prevents harmful output voltage overshoots upon start after converter shutdown. 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 differential ampfication. 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 lowering output voltage causing outputs enter minimum duty cycle mode. When sysnchronous MOSFET drivers used, Bottom DUTY cycle will increase. Synchronous Asynchronous Mode SC1144 configured drive Synchronous MOSFET drivers, such SC1405 higher efficiency. Refer SC1405 datasheet example designs. Component Selection Layout Considerations Care must taken component selection layout high frequency power applications. Refer SC1144EVB user manual more application information component selection layout guidelines well example Artwork Bill materials.
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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
2001 Semtech Corp.
VID1
00UF 00UF 00UF
vcc5v
10uf
VID[4] VCC_L2
$PIN2 VCC_ $PIN2 $PIN2 $PIN2 VCC_ $PIN2 $PIN2 $PIN2 VCC5 $PIN2 $PIN2 $PIN2 VCC_CORE $PIN2 $PIN2 $PIN2 $PIN2 $PIN2 $PIN2 $PIN2 VCC_CORE $PIN2 $PIN2 $PIN2 VCC_CORE $PIN2 $PIN2 $PIN2 VCC_CORE $PIN2 $PIN2 $PIN2 VCC_CORE $PIN2 $PIN2 $PIN2 $PIN2 $PIN2 $PIN1 $PIN1 VCC_CORE $PIN1 $PIN1 $PIN1 VCC_CORE $PIN1 $PIN1 $PIN1 VCC_CORE $PIN1 $PIN1 $PIN1 VCC_CORE $PIN1 $PIN1 $PIN1 $PIN1 $PIN1 $PIN1 $PIN1 VCC_CORE $PIN1 $PIN1 $PIN1 VCC_CORE $PIN1 $PIN1 $PIN1 VCC_CORE $PIN1 $PIN1 $PIN1 VCC_CORE $PIN1 $PIN1 $PIN1 $PIN1 $PIN1 $PIN1 $PIN1 VCC_CORE $PIN1 $PIN1 $PIN1 VCC_CORE $PIN1 $PIN1 $PIN1 VCC_CORE $PIN1 $PIN1 $PIN1 VCC_CORE $PIN1 $PIN1 $PIN1 $PIN1 $PIN1 $PIN1 $PIN1 VCC_CORE $PIN1 $PIN1 $PIN1 VCC_CORE $PIN1 $PIN1 $PIN1 VCC_VTT $PIN1 $PIN1 $PIN1 VCC_VTT $PIN1 $PIN1 $PIN1 $PIN1 u,10V
VID2 VID3 VID4 .01u SEL.
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 serv THERMTRIP# TESTHI PWRGOOD IGNNE# FERR# A20M# IERR# VCC_VTT VCC_VTT
2001 Semtech Corp.
POWER MANAGEMENT Evaluation Board Schematic
INPUT
PRELIMINARY
SC1144
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u,10V u,10V
VID0 Vout/Clk switch
R21R25R26
8.2k Vid3 Vid2 Vid1 Vid0 Vid4 OCOC+ SC1144ABCSW Bgout Enable Comp Rref
vcc5v
Extclk Vcc1
Clksel
Divsel
Trace Outv
VOUT 22u,1 22u,1 22u,1 1u,1 FMMT718 22u,1 FMMT618 IRF78 22u,1 .01u u,10V 22u,1
FMMT7 22u,1
FMMT618 IRF78
FMMT7 u,10V VOUT
FMMT6
FMMT618 IRF78
FMMT718
u,10V
IRF78
22u,1
22u,1
22u,1
22u,1
22u,1
470uF,op
Title
Size
SC1144_EVB
Req'd Freq.<1MHZ/phase +12V Input operation
Date:
u,16V
Documen tNumbe
1u,1
1144evb1 Evaluation Board
VOUT
ednes day, 1999 Sheet
PentiumII
SC1144
POWER MANAGEMENT Bill Materials
Item eference R19, R13, R14, R15, R21, R22, R25, Value 22u, .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 Falco (305)662-7276 T025A2 TO2502 Steward 12220v301R-00 Zetex Motorola Zetex ale,
PRELIMINARY
Manufacturer (818)883-7606 Murata (512) 250-5082 PN#GRM235Y5V226010 AVX, Murata, Murata, Elec. Murata, Elec. Murata Murata Murata, Elec. Murata, Motorola
Vout/C (800)cal-swch 1144ABC Penti um11 conn. Semtech (805)498-2111 Foxconn (714)256-1880
2001 Semtech Corp.
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SC1144
POWER MANAGEMENT Outline Drawing SO-24 PRELIMINARY
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.
Contact Information
Semtech Corporation Power Management Products Division Mitchell Rd., Newbury Park, 91320 Phone: (805)498-2111 (805)498-3804
2001 Semtech Corp.
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