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

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1 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 ±0.% oltage Programming Accuracy Built-In 0k Pull-p Resistors on Program Inputs Available in MSOP-0 Packaging APPLICATIO S Server/Desktop Computers Multiprocessor Workstations and Servers Multiphase Processor Power Supply LTC0-8 ID oltage Programmer for Intel RM 8. DESCRIPTIO The LTC 0-8 is a precision, digitally programmed resistive ladder which adjusts the output of any 0.8referenced regulator. Depending on the state of the five ID inputs, an output voltage between.0 and.8 is programmed in m increments. The LTC0-8 is designed specifically to program an entire family of Linear Technology DC/DC converters in full compliance with the Intel oltage Regulator Module (RM) 8. specification. The LTC0-8 programs the following Linear Technology DC/DC converter products: LTC, LTC8, LTC, LTC0, LTC, LTC-, LTC, LTC, LTC8, LTC, LTC8 and LTC. Consult factory for additional DC/DC converter products compatible with the LTC0-8., LTC and LT are registered trademarks of Linear Technology Corporation. Pentium is a registered trademark of Intel Corporation. TYPICAL APPLICATIO ID Controlled High Current -Phase DC/DC Converter (Simplified Block Diagram). TO OS OS FROM µp ID ID0 SENSE ID LTC0-8 ID ID INT LTC DIFFOT S CLKOT TG SW BG P TG SW BG. TO R SENSE R SENSE OT.0 TO.8 P TO 80A C OT PLLIN LTC TG SW R SENSE NOTE: P TO SIX LTCs/LTCs CAN BE PARALLELED TO DELIER AS MCH AS 00A S BG P TG SW BG R SENSE 0-8 TA0 08f

2 LTC0-8 ABSOLTE AXI RATI GS (Notes, ) W W W Input Supply oltage ( ) to ID Input Pins to SENSE Pin to Pin to Operating Temperature Range (Note ).. 0 C to 8 C Junction Temperature... 0 C Storage Temperature Range... C to 0 C Lead Temperature (Soldering, 0 sec) C W PACKAGE/ORDER I FOR ATIO ID ID0 ID ID TOP IEW 0 8 MS PACKAGE 0-LEAD PLASTIC MSOP T JMAX = 0 C, θ JA = 00 C/W ID SENSE ORDER PART NMBER LTC0EMS-8 MS PART MARKING LTYQ Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T A = C..., ID = ID0 = ID = ID = ID = unless otherwise noted. (Note ) SYMBOL PARAMETER CONDITIONS MIN TYP MAX NITS Operating Supply oltage Range.. I CC Supply Current (Note ) 0 µa R Resistance Between SENSE and 0 kω OT(ERROR) Output oltage Accuracy.00 SENSE % R PLLP Pull-p Resistance on ID DIODE = 0. (Note ) 8 0 kω IH Minimum High Level Input oltage (ID Inputs) =. IL Maximum Low Level Input oltage (ID Inputs) =. 0.8 I IN Input Leakage Current (ID Inputs) < ID < (Note ) 0.0 ± µa Note : Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note : All voltages are with respect to pin. Note : The LTC0-8 is guaranteed to meet performance specifications from 0 C to 0 C. Specifications over the 0 C to 8 C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note : Supply current is specified with all ID inputs floating. Due to the internal pull-ups on the ID pins, the supply current will increase depending on the number of grounded ID lines. Each grounded ID line will draw approximately [( 0.)/0]mA. If the ID inputs are left unconnected, they will float to at a rate controlled by parasitic capacitance. ntil the ID inputs reach their final states, slightly higher I CC current may be observed. (See the Operation section for more detail.) 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.) 08f

3 LTC0-8 TYPICAL PERFOR A CE CHARACTERISTICS W 0. Typical Error % vs Output oltage T A = C 0. Typical Error % vs Temperature ERROR (%) 0 ERROR (%) 0 OT =.0 OT =. OT = OTPT OLTAGE () 0-8 G TEMPERATRE ( C) 0-8 G0 0.0 R vs Temperature 0 ID Pullup Current vs Temperature =. ID PIN NDER TEST = 0 R (kω) ID PLL-P CRRENT (µa) TEMPERATRE ( C) 0-8 G TEMPERATRE ( C) 0-8 G0.0 Supply Current vs Temperature ALL ID INPTS OPEN.0 Supply Current vs Supply oltage ALL ID INPTS OPEN T A = C SPPLY CRRENT (µa) 0. = =. SPPLY CRRENT (µa) 0. = TEMPERATRE ( C) 0-8 G SPPLY OLTAGE () 0-8 G0 08f

4 LTC0-8 PI F CTIO S ID (Pin ): Programming Input. = LOW, or Float = HIGH. Refer to Table for programming information. Connect to associated ID pin of µp. ID0 (Pin ): Programming Input. = LOW, or Float = HIGH. Refer to Table for programming information. Connect to associated ID pin of µp. ID (Pin ): Programming Input. = LOW, or Float = HIGH. Refer to Table for programming information. Connect to associated ID pin of µp. ID (Pin ): Programming Input. = LOW, or Float = HIGH. Refer to Table for programming information. Connect to associated ID pin of µp. (Pin ): Power Supply oltage. May range from. to.. SENSE (Pin ): Regulator Output oltage. Connect directly to regulator output sense node or DIFFOT when used with the LTC or LTC. ID (Pin ): Programming Input. = LOW, or Float = HIGH. Refer to Table for programming information. Connect to associated ID pin of µp. (PIN 8): No Connect. (Pin ): Ground. Connect to regulator signal ground. (Pin 0): Feedback Input. Connect to the 0.8 feedback pin of a compatible regulator or the pin of the LTC or LTC. BLOCK DIAGRA W 0k ID 0k SENSE ID0 R 0k 0k SWITCH CONTROL LOGIC R 0 ID 0-8 BD 0k 0k ID ID 08f

5 LTC0-8 OPERATIO The LTC0-8 is a precision programmable resistive divider designed specifically for use with an entire family of Linear Technology Corporation DC/DC switching regulators with 0.8 internal reference and feedback voltages. The LTC0-8 programs an output voltage ranging from.00 to.8 in m steps, depending on the state of the ID input pins. The LTC0-8 in conjunction with a Linear Technology DC/DC switching regulator can be used to create a high performance voltage regulator meeting all the requirements of the Intel RM 8. specification. oltage Sensing and Feedback Pins The LTC0-8 operates by closing the loop between the output node and the feedback node of the regulator with an appropriate resistive divider network. The top feedback resistor, R, connected between SENSE and, is a fixed value of typically 0k. The bottom feedback resistor, R, is set by the five ID inputs to generate the desired regulator output voltage. Feedback resistors R and R are matched and temperature stable in order to provide a highly accurate output voltage. The pin is a sensitive node in the circuit. Care should be taken to minimize the layout distance between the LTC0-8 node and the regulator feedback node. In addition, it is important to keep tight ground connections between the two chips. ID Inputs The desired output voltage is obtained by applying the proper voltage or float condition to the five digital ID inputs. Table shows the translation table with each input state and the corresponding regulator output voltage. This translation is derived from and adheres to the Intel RM 8. specification. Each ID input is pulled up by a 0k resistor in series with a diode connected to. To produce a digital low a ID input should be grounded or driven to a low state. The ID inputs must be driven with a maximum IL of 0.8 ( =.). When a ID input is grounded or pulled low with a logic gate, the power supply current will increase because of the resistor from through the series diode to the input. This increase in current is calculated from: I Q = N ( DIODE )/R PLLP where N is the number of grounded ID inputs. With typical values of =., DIODE = 0. and R PLLP = 0k, each grounded input will sink approximately 8µA. To apply a digital high state the input can be either floated, connected to or driven by a logic gate. The ID inputs should be driven with a minimum IH of ( =.). Because of the diode between and the pull-up resistor, the maximum IH is not limited to. The ID inputs can be driven higher than without being clamped or damaged. This allows the LTC0-8 to be fully logic compatible and operational over a wide input voltage range, up to the absolute maximum rating. When used with the LTC and LTC, the LTC0-8 s, SENSE, and pins should be connected respectively to the, DIFFOT, INT and S pins of the LTC and LTC. The result of this application is a precisely controlled, multiphase, variable output voltage supply applicable to any low output voltage system such as a personal computer, workstation or network server. In addition to the LTC and LTC, the LTC0-8 also programs a whole family of LTC DC/DC converters that have an onboard 0.8 reference. The LTC8, LTC and LTC are just a few of the high efficiency step-down switching regulators that will work equally well with the LTC0-8. Contact LTC Marketing for a more complete listing of compatible DC/DC regulators. 08f

6 OPERATIO LTC0-8 Table. ID Inputs and Corresponding Output oltage CODE ID ID ID ID0 ID OLTAGE Float Float Float Float Float Float Float. 000 Float Float Float Float Float Float Float Float Float Float Float Float Float Float Float.0 00 Float Float Float. 00 Float Float Float.00 0 Float Float Float Float. CODE ID ID ID ID0 ID OLTAGE 0000 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. 000 Float Float.0 00 Float Float Float. 00 Float Float Float.00 0 Float Float Float Float. 00 Float Float Float.0 0 Float Float Float Float. 0 Float Float Float Float.00 Float Float Float Float Float. TYPICAL APPLICATIO S 0A, -Phase ID Controlled Power Supply OPTIONAL SY CLOCK IN FROM µp ID SENSE ID0 00pF ID LTC0-8 ID ID 0 : OT :.0 TO.8, 0A M TO M: FDS0A L TO L: µh SMIDA CEP-IROMC-H D TO D0: CENTRAL CMDSH-TR C OT : PANASONIC EEFEOG8R 0.µF 0.µF 000pF RN/SS SENSE SENSE PLLFLTR PLLIN TG SW BOOST BG EXT 00pF 8 LTC INT 0k 00pF S P 0 DIFFOT OS BG BOOST 000pF OS SW SENSE TG SENSE AMPMD k k 8 D 0 D8 8 0.µF 0.µF µf. µf. µf M 0µF, M M M L M M L 0.00Ω D 0T 80µF D 0T 0.00Ω OT.0 TO.8 0A 08f

7 LTC0-8 TYPICAL APPLICATIO S ID Controlled High Current 0A -Phase Power Supply OPTIONAL SY CLOCK IN FROM µp ID ID0 ID ID ID LTC0-8 SENSE 00pF 0 0.µF 0.µF 00pF 0k k 00pF k 000pF OS OS pF RN/SS CLKOT SENSE TG SENSE SW BOOST PLLFLTR PLLIN S BG LTC EXT INT P DIFFOT BG OS BOOST OS SW SENSE TG SENSE AMPMD 8 D 0 D8 8 0.µF 0.µF µf. µf. µf M 0µF, M M M L M M L 0.00Ω D 0T 0µF,. KEMET CAP D 0T 0.00Ω OT.0 TO.8 0A : OT :.0 TO.8, 0A M TO M: Si0DP L TO L: µh SMIDA CEP-IROMC-H D TO D0: CENTRAL CMDSH-TR C OT : KEMET T0XM00AS pf 0.0µF DIFFOT OS OS 000pF 000pF 0k nf 00pF 8 0 RN/SS SENSE SENSE PLLFLTR PLLIN PHASMD S DIFFOT OS OS SENSE SENSE LTC 8 TG SW BOOST BG EXT INT 0 P BG 8 BOOST SW TG AMPMD D 0.µF D0 0.µF µf µf. µf. M 0µF, M0 M8 M L 0.00Ω L M M D 0T 0µF,. KEMET CAP D 0T 0.00Ω 0-8 TA0 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. 08f

8 LTC0-8 PACKAGE DESCRIPTIO 0.88 ± 0. (.0 ±.00) MS Package 0-Lead Plastic MSOP (Reference LTC DWG # 0-08-).00 ± 0.0 (.8 ±.00) (NOTE ) ± 0.0 (.0 ±.00) REF. (.0) MIN.0 ± 0.8 (.00 ±.00) TYP.. (..) 0.0 (.0) BSC RECOMMENDED SOLDER PAD LAYOT GAGE PLANE 0.8 (.00) 0. (.00) DETAIL A NOTE:. DIMENSIONS IN MILLIMETER/(IH). DRAWING NOT TO SCALE. DIMENSION DOES NOT ILDE MOLD FLASH, PROTRSIONS OR GATE BRRS. MOLD FLASH, PROTRSIONS OR GATE BRRS SHALL NOT EXCEED 0.mm (.00") PER SIDE. DIMENSION DOES NOT ILDE 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 DETAIL A 0 TYP 0. ± 0.0 (.0 ±.00) SEATING PLANE.88 ± 0.0 (. ±.00).0 (.0) MAX (.00.0) 0.0 (.0) TYP.00 ± 0.0 (.8 ±.00) NOTE 0.8 (.0) REF 0. ± 0.0 (.00 ±.00) MSOP (MS) 00 RELATED PARTS PART NMBER DESCRIPTION COMMENTS LTC Sychnronizable Low oltage Step-Down Controller 8-Pin MSOP, 0, 0kHz, Burst Mode Operation LTC8/LTC8-PG Dual High Efficiency, -Phase Sync Step-Down Controller Constant Freq, Standby, and. LDOs,. LTC/LTC-PG PolyPhase High Efficiency Step-Down DC/DC Controller Expandable p to Phases, p to 00A, Remote Sense Diff Amp LTC0/LTC0 Dual High Efficiency, -Phase Sync Step-Down Controller 0kHz, MHz GBW, No R SENSE TM,. LTC0-8/LTC0-8 ID oltage Programmer with Desktop Code RM 8.-RM 8., OT Range:. to. LTC0/LTC Phase Sync Step-Down Controller with -Bit Desktop ID, PLL, -Pin SSOP, Current Mode Operation LT0-8 -Phase, -Bit ID, Current Mode High Efficiency, -Pin SSOP RM 8. Compatiable Synchronous Step-Down Switching Regulator LTC High Efficiency Sync Step-Down Controller Burst Mode Operation, -Pin Narrow SSOP, Fault Protection,. LTC High Efficiency Sync Buck Controller with -Bit Mobile ID GN-, Power Good, Output Fault Protection,. LTC SOT- Low oltage Step-Down Controller -Pin SOT-,. 0, 0kHz, Burst Mode Operation LTC Synchronous Step-Down DC/DC Controller p to % Efficiency, 0kHz Operation,. 8., 0.8 OT LTC8 Wide Operating Range Step-Down Controller No R SENSE, up to, Current Mode Power Good LTC/LTC-PG -Phase Sync Step-Down Controller Current Mode Operation, I OT p to 0A,. LTC8 0kHz, -Phase Dual Output Synchronous Synchronizable, Current Mode,., Step-Down Controller I OT up to A LTC 0kHz, PolyPhase, High Efficiency Synchronous Current Mode,, 8-Lead SSOP package Step-Down Switching Regulator Burst Mode and PolyPhase are registered trademarks of Linear Technology Corporation. No R SENSE is a trademark of Linear Technology Corporation. Linear Technology Corporation 0 McCarthy Blvd., Milpitas, CA 0- (08) -00 FAX: (08) LINEAR TECHNOLOGY CORPORATION 00 08f LT/TP 0 K PRINTED IN SA

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

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 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