LMS1145 5-Bit Programmable, High Frequency Multi-phase Controller

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LMS1145 5-Bit Programmable, High Frequency Multi-phase Controller

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LMS1145 5-Bit Programmable, High Frequency Multi-phase Controller
LMS1145 5-Bit Programmable, High Frequency Multi-phase Controller
LMS1145 provides attractive solution power supplies high power microprocessors (such PentiumII, IITM, K6-3, Merced, etc.) exhibiting ultra fast load transients. Compared conventional single-phase supply, LMS1145 based multi-phase supply distributes thermal electrical loading among components multiple phases greatly reduces corresponding stress each component. LMS1145 programmed control either 3-phase converter 4-phase converter. Phase shift among phases 120° case three phase with four-phase. Because power channels phase, there significant ripple cancellation both input output current, resulting reduced input output capacitor size. nominal operating frequency phase, size output inductors greatly reduced which results much faster load transient response dramatically shrunk output capacitor bank. Microprocessor power supplies with surface mount components easily built. internal high speed transconductance amplifier guarantees good dynamic performance. internal master clock frequency external reference resistor. external clock also used drive chip achieve frequency control multi-chip operation. LMS1145 also provides input under-voltage lock-out with hysteresis, input over-current protection output voltage power good detection.
Features
Ultra fast load transient response Enables surface-mount-design Selectable phase operation Clock frequency from Precision load current sharing 5-bit programmable from 3.5V 1.3V Selectable internal external clock Digital 16-step soft start Input under-voltage lock-out, over-current protection Open-drain power good signal output
Applications
Servers workstations High current, ultra-fast transient microprocessors
Configuration
24-Pin Plastic SOIC
DS101248-1
View Package Number M24B
IIis trademark Cyrix Corporation wholly owned subsidiary National Semiconductor Corporation. Pentiumis trademark Intel Corporation. K6is trademark Advanced Micro Devices, Inc.
1999 National Semiconductor Corporation
DS101248
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LMS1145
Absolute Maximum Ratings (Note
Military/Aerospace specified devices required, please contact National Semiconductor Sales Office/ Distributors availability specifications. VCC5V PWRGD VCC12V Junction Temperature Power Dissipation (Note (VCC 0.2V) 125°C 1.6W
Storage Temperature Susceptibility (Note Soldering Time, Temperature
-65°C +150°C sec., 300°C
Operating Ratings (Note
Junction Temperature Range 4.5V 5.5V 70°C
Electrical Characteristics
VCC5V VCC12V unless otherwise specified. Typicals limits appearing plain type apply +25°C. Limits appearing boldface type apply over entire operating temperature range. Symbol VDACOUT ICC12V ICC5V VREF VINL VINH Parameter 5-bit Output Voltage Quiescent VCC12V Current Operating VCC5V Current Rref Voltage Vid0:4, Clksel, Divsel, Enable Pins Logic Threshold Vid0:4 Enable Pins Internal Pullup Current IINL Clksel, Divsel Pins Internal Pullup Current Gate Driver Resistance When Sinking Current VDRV tfall ISRC ISINK VBgOUT IBgOUT FOSC Toff DRV0:3 Output Voltage DRV0:3 Fall Time DRV0:3 Source Current DRV0:3 Sink Current BgOUT Voltage BgOUT Sink Current Bias Current Oscillator Frequency DRV0:3 Duty Cycle Match DRV0:3 Phase Accuracy Logic (Note Logic High (Note Corresponding Conditions (Note Enable 00001, Outputs Floating VOUT 2.00V Units
N-1.5%
1.225
N+1.5%
ISINK VCC12V IDRV VCC12V (Note DRV0:3 VCC12V DRV0:3 VCC12V Current Limit Activated Current Limit Activated BgOUT 8.02k from Rref Ground Duty Cycle Duty Cycle 50%, Fclock Divide Divide 1.3V VOUT 1.9V VCC12V 1.5V
VCC12V -1.0V
time Power Good Detection Window, VOUT
VPWRGD
Hysteresis Power Good Detection Window, VOUT Hysteresis VOUT 3.5V
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LMS1145
Electrical Characteristics
Symbol IPWRGD VOCC_CM IB_OC+ IB_OC- VOS_OCC DMAX Vramp Icomp Icomp Vcomp_hi Vcomp_lo VPOR Parameter Power Good Sink Current Over-current Comparator Common Mode Range Input Bias Current Input Bias Current
(Continued)
VCC5V VCC12V unless otherwise specified. Typicals limits appearing plain type apply +25°C. Limits appearing boldface type apply over entire operating temperature range. Conditions VPWRGD 0.4V 1.36 0.19 Vcc5V Voltage Rising Vcc5V Voltage Falling Vcc12V Minimum Working Voltage Soft Start Delay (Note FOSC 8MHz Units
Over-current Comparator Input Offset Voltage Maximun Duty Cycle Error Amplifier Transconductance Ramp Signal Peak-to-Peak Amplitude COMP Source Current COMP Sink Current COMP High Clamp COMP Clamp Power Reset Trip Point
mmho
Note Absolute Maximum Ratings limits beyond which damage device occur. Operating ratings imply guaranteed performance limits. Note Maximum allowable power dissipation function maximum junction temperature, TJMAX, junction-to-ambient thermal resistance, ambient temperature, maximum allowable power dissipation ambient temperature calculated using: PMAX (TJMAX TA)/JA. junction-to-ambient thermal resistance, LMS1145 78°C/W. TJMAX 150°C 25°C, maximum allowable power dissipation 1.6W. Note letter stands typical output voltages appearing italic boldface type Table Note value logic means voltage below this value guaranteed taken logic whereas voltage higher than this value guaranteed taken logic low. Note value logic high means voltage above this value guaranteed taken logic high whereas voltage lower than this value guaranteed taken logic high. Note When driving bipolar drivers typical application circuit. Note When Vcc12V goes below this voltage, pins Note ratings based human body model, 100pF discharged through 1.5k.
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LMS1145
Electrical Characteristics
Symbol VDACOUT
(Continued)
TABLE 5-Bit Output Voltage Table Parameter 5-Bit Output Voltages Different Codes Conditions VID4:0 01111 VID4:0 01110 VID4:0 01101 VID4:0 01100 VID4:0 01011 VID4:0 01010 VID4:0 01001 VID4:0 01000 VID4:0 00111 VID4:0 00110 VID4:0 00101 VID4:0 00100 VID4:0 00011 VID4:0 00010 VID4:0 00001 VID4:0 00000 VID4:0 11111 VID4:0 11110 VID4:0 11101 VID4:0 11100 VID4:0 11011 VID4:0 11010 VID4:0 11001 VID4:0 11000 VID4:0 10111 VID4:0 10110 VID4:0 10101 VID4:0 10100 VID4:0 10011 VID4:0 10010 VID4:0 10001 VID4:0 10000 Typical Units
1.30
1.35
1.40
1.45
1.50
1.55
1.60
1.65
1.70
1.75
1.80
1.85
1.90
1.95
2.00
2.05
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LMS1145
Description
Name Vcc5V Divsel Clksel Extclk Rref Vid0 Vid1 Vid2 Vid3 Vid4 COMP Bgout ENABLE DRV2 DRV0 Vcc12V DRV1 DRV3 PWRGD Supply Voltage Input nominal) Selects Phase Mode. Logic selects phase. Logic high selects phase. phase operation achieved using outputs phase mode. Clock Select: Logic high selects internal clock. Logic selects external clock. External Clock Input. Output frequency Clock Input Phases. Connect Vcc5V select internal clock. Connects external reference resistor. Sets operating frequency internal clock ramp time PWM. Reference voltage this 1.26V. 5-Bit Input (LSB). 5-Bit Input. 5-Bit Input. 5-Bit Input. 5-Bit Input (MSB) Over-current Comparator. Non-inverting input. Over-current Comparator. Inverting input. Compensation Pin. This output internal transconductance amplifier. Compensation network should connected between this feedback ground FBG. Feedback Input. Normally Kelvin connected supply output. Current Limit Flag. Goes logic when current limit activated. When over-current condition removed, this weakly pulled Vcc5V. Feedback Ground. This should connected ground supply output. Output Enable Pin. logic high enable logic disable. Power Ground Pin. Phase Output. Phase Output. Supply Voltage Drivers DRV0:3. Phase Output. Phase Output. Power Good. This open-drain output that goes (low impedance ground) when output voltage travels threshold window, resume open-drain state when VOUT recovers into 50mV hysteresis window. power good window threshold, i.e. 100mV 1.3V VOUT 1.9V 150mV VOUT 3.5V, automatically according code. Connect capacitor ground filter switching noise coupling from DRV3 this pin. Function
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LMS1145
Block Diagram
DS101248-2
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LMS1145
Typical Application
DS101248-3
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LMS1145 5-Bit Programmable, High Frequency Multi-phase Controller
Physical Dimensions
inches (millimeters) unless otherwise noted
24-Lead Small Outline Package Order Number LMS1145M Package Number M24B
LIFE SUPPORT POLICY NATIONAL'S PRODUCTS AUTHORIZED CRITICAL COMPONENTS LIFE SUPPORT DEVICES SYSTEMS WITHOUT EXPRESS WRITTEN APPROVAL PRESIDENT GENERAL COUNSEL NATIONAL SEMICONDUCTOR CORPORATION. used herein: Life support devices systems devices systems which, intended surgical implant into body, support sustain life, whose failure perform when properly used accordance with instructions provided labeling, reasonably expected result significant injury user.
National Semiconductor Corporation Americas Tel: 1-800-272-9959 Fax: 1-800-737-7018 Email: support@nsc.com www.national.com National Semiconductor Europe Fax: 80-530 Email: europe.support@nsc.com Deutsch Tel: 80-530 English Tel: 80-532 Tel: 80-532 Italiano Tel: 80-534
critical component component life support device system whose failure perform reasonably expected cause failure life support device system, affect safety effectiveness.
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National Semiconductor Japan Ltd. Tel: 81-3-5639-7560 Fax: 81-3-5639-7507
National does assume responsibility circuitry described, circuit patent licenses implied National reserves right time without notice change said circuitry specifications.

LMS1145 5-Bit Programmable, High Frequency Multi-phase Controller

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