5-Bit VID-Controlled High Current Application (Simplified Block Diagram) 4.5V TO 22V LTC TG1 SW1 BG1 PGND TG2 SW2 BG2 4.5V TO 22V LTC TG1

Size: px

Start display at page:

Download "5-Bit VID-Controlled High Current Application (Simplified Block Diagram) 4.5V TO 22V LTC TG1 SW1 BG1 PGND TG2 SW2 BG2 4.5V TO 22V LTC TG1"

Francis Jennings
5 years ago
Views:

1 LTC0- -Bit ID oltage Programmer for AMD Opteron CPs FEATRES Programs Regulator Output oltage Range from 0. to. in m Steps Programs a Wide Range of Linear Technology DC/DC Converters with a 0. Reference ±0.% Accurate Output oltage Built-In 0k Pull-p Resistors on ID Inputs Available in MSOP-0 Package APPLICATIO S AMD Opteron TM Processor Power Supply Workstations and Servers Large Memory Array Supply DESCRIPTIO The LTC 0- is a precision, digitally programmed, resistive ladder which adjusts the output of any 0. referenced regulator. Depending on the state of the five ID inputs, an output voltage between 0. and. is programmed in m increments. The LTC0- is designed specifically to program an entire family of Linear Technology DC/DC converters with on board 0. references. The LTC0- programs the following Linear Technology DC/DC converter products: LTC-, LTC, LTC and LTC. (Consult factory for additional DC/DC converter products.), LTC and LT are registered trademarks of Linear Technology Corporation. AMD Opteron is a trademark of Advanced Micro Devices, Inc. TYPICAL APPLICATIO -Bit ID-Controlled High Current Application (Simplified Block Diagram). TO FROM µp ID ID ID LTC0- LTC- INT DIFFOT S TG SW BG P TG SW BG. TO L L R R OT 0. TO. P TO 0A C OT LTC- TG SW L R S BG P TG SW BG L R 0- TA0 0f

2 LTC0- ABSOLTE MAXIMM RATINGS W W W (Note ) (oltages Referred to Pin) Input Supply oltage ( ) to ID Input Pins to Pin to Pin to Operating Ambient Temperature Range (Note )... 0 C to C Junction Temperature... 0 C Storage Temperature Range... C to 0 C Lead Temperature (Soldering, 0 sec) C PACKAGE/ORDER INFORMATION ID ID ID TOP IEW 0 MS PACKAGE 0-LEAD PLASTIC MSOP T JMAX = 0 C, θ JA = 0 C/ W NC W ORDER PART NMBER LTC0EMS- MS PART MARKING LTK Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The denotes specifications which apply over the full operating temperature range, otherwise specifications are T A = C..., = ID = ID = ID = = NC unless otherwise specified. SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS Operating Supply oltage Range.. I CC Supply Current (Note ) 0. µa R - Resistance Between and 0 kω OT Error % Output oltage Accuracy % R PLLP ID Input Pull-p Resistance DIODE = 0. (Note ) 0 kω ID TH ID Input oltage Threshold IL (..) 0. IH (..). I ID-LEAK ID Input Leakage Current < ID < (Note ) 0.0 ± µa PLLP ID Pull-p oltage =.. =. Note : Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note : The LTC0EMS- is guaranteed to meet performance specifications from 0 C to 0 C. Specifications over the 0 C to C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note : With all five ID inputs floating, the supply current is simply the device leakage current. However, the supply current will rise and be approximately equal to the number of grounded ID input pins times ( 0.)/0k. (See the ID Input Characteristics section for more details.) Note : Each built-in pull-up resistor attached to the ID inputs also has a series diode connected to to allow input voltages higher than the supply without damage or clamping. (See Operation section for further details.) 0f

3 LTC0- TYPICAL PERFORMANCE CHARACTERISTICS W I ID-PLLP vs Temperature Supply Current vs Temperature Supply Current vs Supply oltage ID PLL-P CRRENT (µa) = = 0 = ID = ID = ID = OPEN SPPLY CRRENT (µa) ALL ID INPTS OPEN = =. =. SPPLY CRRENT (µa).0 0. ALL ID INPTS OPEN T A = C TEMPERATRE ( C) TEMPERATRE ( C) SPPLY OLTAGE () 0- G0 0- G0 0- G0 0. ID Sense Accuracy ID 0. ID Sense Accuracy vs Temperature =. 0.0 R vs Temperature ID ACCRACY (%) =. =. IDACCRACY (%) =. = 0. =. R (kω) OLTAGE () TEMPERATRE ( C) TEMPERATRE ( C) 0- G0 0- G0 0- G0 PIN FNCTIONS (Pin ): LSB Programming Input. Low =, High = or Float. Grounding adds m to the output sense voltage. ID (Pin ): th MSB Programming Input. Low =, High = or Float. Grounding ID adds 0m to the output sense voltage. ID (Pin ): rd MSB Programming Input. Low =, High = or Float. Grounding ID adds 00m to the output sense voltage. ID (Pin ): nd MSB Programming Input. Low =, High = or Float. Grounding ID adds 00m to the output sense voltage. (Pin ): Power Supply oltage. Range from. to.. (Pin ): Regulator Output oltage. Connect directly to regulator output sense node. (Pin ): MSB Programming Input. Low =, High = or Float. Grounding adds 00m to the output sense voltage. NC (Pin ): No Connect. (Pin ): Ground. Connect to regulator signal ground. (Pin 0): Feedback Input. Connect to the 0. feedback pin of a compatible regulator. 0f

4 LTC0- PIN FNCTIONS NOMINAL () ABSOLTE MAX () PIN NAME DESCRIPTION MIN TYP MAX MIN MAX LSB Programmable Input 0 0. ID th MSB Programmable Input 0 0. ID rd MSB Programmable Input 0 0. ID nd MSB Programmable Input 0 0. Power Supply.. 0. Regulator Output oltage st MSB Programmable Input 0 0. NC Ground Feedback Input BLOCK DIAGRA W 0k 0k ID R 0k SWITCH CONTROL LOGIC R 0 ID 0- BD 0k 0k ID OPERATIO The LTC0- is a precision resistive divider designed specifically for use with an entire family of Linear Technology Corporation DC/DC switching regulators with 0. internal reference and feedback voltage. The LTC0- produces an output voltage ranging from 0. to. in m steps by closing the loop between the output voltage sense and the feedback input of the regulator with the appropriate resistive divider network. The top feedback resistor, R, connected between and, is typically 0k and is not modified by the state of the ID program inputs. The bottom feedback resistor, R, however, is modified by the five ID inputs and is precisely ratioed to R. 0f

5 LTC0- OPERATIO ID Programming A list of programmed inputs and their corresponding output voltages is shown in Table. Programming is accomplished by applying the proper voltage (or float condition) on the five digital ID inputs. Table. ID Inputs and Corresponding Output oltage CODE ID ID ID OTPT Float Float Float Float Float Float Float. 000 Float Float Float Float Float Float Float Float. 000 Float Float Float Float Float. 000 Float Float.0 00 Float Float Float. 00 Float Float Float.00 0 Float Float Float Float Float Float Float. 000 Float Float Float Float Float Float Float Float Float Float.0 00 Float Float Float Float Float Float Float Float Float Float Float Float Float Float Float Float Float Float Float Float Float Float Float Float Float Float 0. 0 Float Float Float Float 0.00 Float Float Float Float Float *0. *Represents codes without a defined output (shutdown) voltage as specified in AMD specifications. The LTC0- interprets these codes as a valid input and produces an output voltage as follows: () = 0.. When all five ID inputs are high or floating, such as when no CP is present in a system, a regulated 0. output is generated at. Each ID input pin is pulled up by a 0k resistor in series with a diode connected to. Therefore, it should be grounded (or driven low) to produce a digital low input. It can either be floated or connected to to get a digital high input. The series diode is included to prevent the input from being damaged or clamped when it is driven higher than. oltage Sensing and Feedback Pins The pin is a high impedance node that requires minimum layout distance to reduce extra loading and unwanted stray pickup. When used with the LTC-, the LTC0- s,, and pins should be connected, respectively, with the, DIFFOT, INT and S pins of the LTC-. The result of this application is a precisely controlled, variable output voltage supply to any low voltage, high current system such as a powerful personal computer, workstation or network server. ID Input Characteristics The ID inputs should be driven with a maximum IL of 0. and a minimum IH of.. However, the ID input range is not limited to values less than. Because of the internal diode between and the pull-up resistor, the inputs can go higher than without being clamped to or damaging the input. This allows the LTC0- to be fully logic compatible and operational over a higher input voltage range (less than the absolute maximum rating). When a ID input is grounded, there will be a higher quiescent current flow from because of a resistor from through a series diode to each one of the inputs. This increase in quiescent current is calculated from: I Q = N( DIODE )/R PLLP N is the number of grounded ID inputs. DIODE is typically 0. while R PLLP has a typical pull-up resistance of 0kΩ. 0f

6 OPERATIO LTC0- In other words, each ID input has a typical pull-up current of µa for a. system. Besides the LTC-, the LTC0- also programs a whole family of LTC DC/DC converters that have an onboard 0. reference. The LTC, LTC and LTC are just a few of the high efficiency step-down switching regulators that will work equally well with the LTC0-. TYPICAL APPLICATIO -Phase Input, 0. to./a Max Power Supply with Adjustable Overvoltage Protection DD _ CORE LTC0- OP TO SYSTEM OEROLTAGE PROTECTION COMPARATOR OP THRESHOLD LOGIC ID ID ID FROM µp PWRGD ENABLE ID C 0.µF R.k D BAT C.nF R.k C0 0pF INT R 0k Q (OPT) N00 RN/SS CLK C 0pF C nf C nf LTC 0 RN/SS PLLFLTR PLLIN FCB S DIFFOT OS OS ATTENOT NO_CP ID PGOOD TG SW BOOST BG EXT INT P BG BOOST SW TG ATTENIN BIAS ID ID 0 0 C µf INT C.µF R 0Ω C 0µF C C 0.µF C D BATA R 0Ω Q SiDP Q SiDP Q SiDP Q SiDP C L 0.µH D B0A C 0Ω L 0.µH D B0A R 0.00Ω 0Ω 0Ω R 0.00Ω 0Ω C IN C C OT R 0Ω C DD _ CORE R 0Ω CORE_H ID ID CORE_L C IN : SIX 0µF CERAMIC CAPACITORS C OT : TEN µf. CERAMIC CAPACITORS L, L: SMIDA CEP-R0MC-H 0- TA0 0f

7 LTC0- TYPICAL APPLICATIO 0. to. ID Programmable A Power Supply µf XR 00pF 0k 0.0µF 0k pf 00k 0 RN/SS BOOST LTC ON TG PGOOD SW RNG FCB P S BG I ON DR INT EXT 0 CMDSH-.µF XR. 0.µF Ω 0.µF 0µF XR IRF 0.µH B0A IRF SP 0µF OT 0. TO. A µf. XR FROM µp ID ID ID LTC TA0 PACKAGE DESCRIPTION. (.0) MIN 0.0 ± 0.0 (.00 ±.00) TYP 0. ± 0. (.0 ±.00).. (..) 0.0 (.0) BSC RECOMMENDED SOLDER PAD LAYOT MS Package 0-Lead Plastic MSOP (Reference LTC DWG # 0-0-) GAGE PLANE 0. (.00) 0. (.00) DETAIL A DETAIL A NOTE:. DIMENSIONS IN MILLIMETER/(INCH). DRAWING NOT TO SCALE. DIMENSION DOES NOT INCLDE MOLD FLASH, PROTRSIONS OR GATE BRRS. MOLD FLASH, PROTRSIONS OR GATE BRRS SHALL NOT EXCEED 0.mm (.00") PER SIDE. DIMENSION DOES NOT INCLDE INTERLEAD FLASH OR PROTRSIONS. INTERLEAD FLASH OR PROTRSIONS SHALL NOT EXCEED 0.mm (.00") PER SIDE. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.0mm (.00") MAX 0 TYP 0. ± 0.0 (.0 ±.00) SEATING PLANE.00 ± 0.0 (. ±.00) (NOTE ).0 ± 0. (. ±.00).0 (.0) MAX (.00.0) TYP Information furnished by Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights (.0) BSC 0. ± 0.0 (.0 ±.00) REF.00 ± 0.0 (. ±.00) NOTE 0. (.0) REF 0. ± 0.0 (.00 ±.00) MSOP (MS) 00 0f

8 LTC0- TYPICAL APPLICATION ID Controlled High Current 0A -Phase Application OPTIONAL SYNC CLOCK IN FROM µp ID ID ID LTC0-0 00pF 0.µF 0.µF k 00pF 00pF DIFFOT OS OS 000pF 0 000pF RN/SS PLLFLTR PLLIN PHASMD CLKOT TG SW BOOST BG EXT LTC- INT S P DIFFOT BG OS BOOST OS SW TG AMPMD 0 D D µf µf 0Ω µf. M 0µF, M M M L M M 0.00Ω D MBRS 0T C OT 0µF,. D MBRS 0T 0.00Ω OT 0. TO. 0A L k k M TO M: FDS0A L TO L: µh SMIDA CEPH-IROMC D TO D0: CENTROI CMDSH-TR C OT : KEMET T0XM00AS f SW : 00kHz pf 0.0µF 000pF 0k pf DIFFOT OS OS 000pF 0 RN/SS PLLFLTR PLLIN PHASMD CLKOT TG SW BOOST BG EXT S LTC- INT 0 P DIFFOT OS OS BG BOOST SW TG AMPMD D D0 µf µf 0Ω µf. M 0µF, M0 M M L M M L 0.00Ω D MBRS 0T C OT 0µF,. D MBRS 0T 0.00Ω 0- TA0 RELATED PARTS PART NMBER DESCRIPTION COMMENTS LTC- PolyPhase Synchronous Step-Down Controller p to -Phase Operation, p to 00A Power Supply LTC Single Phase Synchronous Step-Down Controller with ID 0. OT., I OT A LTC -Phase Synchronous Step-Down Controller with ID 0. OT., I OT 0A LTC AMD Opteron CP Power Supply 0. OT., I OT 0A LTC -Phase, 0A Synchronous Step-Down Controller Single IC 0A Solution with Onboard MOSFET Drivers, ±% Output Current Matching for Optimum Thermal Performance and Reliability LTC -Phase, 0A Synchronous Step-Down Controller for On-Board ID and MOSFET Drivers, 0. OT., I OT 0A AMD Opteron Processors LTC Optional R Synchronous Step-Down Controller, 0. OT (0.), I OT A PolyPhase is a registered trademark of Linear Technology Corporation. Linear Technology Corporation 0 McCarthy Blvd., Milpitas, CA 0- (0) -00 FAX: (0) f LT/TP 00 K PRINTED IN SA LINEAR TECHNOLOGY CORPORATION 00

VID Controlled High Current 4-Phase DC/DC Converter (Simplified Block Diagram) 4.5V TO 22V V OS TG1 INTV CC SW1 LTC1629 BG1 PGND SGND TG2 EAIN SW2

VID Controlled High Current 4-Phase DC/DC Converter (Simplified Block Diagram) 4.5V TO 22V V OS TG1 INTV CC SW1 LTC1629 BG1 PGND SGND TG2 EAIN SW2 FEATRES Fully Compliant with the Intel RM 8. ID Specification Programs Regulator Output oltage from.0 to.8 in m Steps Programs an Entire Family of Linear Technology DC/DC Converters with 0.8 References