View LTC1706-61_213975.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

LTC1706-61 5-Bit VID Voltage Programmer for AMD Opteron CPUs
FEATURES
s s
DESCRIPTIO
s s s
Programs Regulator Output Voltage Range from 0.8V to 1.55V in 25mV Steps Programs a Wide Range of Linear Technology DC/DC Converters with a 0.6V Reference 0.35% Accurate Output Voltage Built-In 40k Pull-Up Resistors on VID Inputs Available in MSOP-10 Package
The LTC(R)1706-61 is a precision, digitally programmed, resistive ladder which adjusts the output of any 0.6V referenced regulator. Depending on the state of the five VID inputs, an output voltage between 0.8V and 1.55V is programmed in 25mV increments. The LTC1706-61 is designed specifically to program an entire family of Linear Technology DC/DC converters with on board 0.6V references. The LTC1706-61 programs the following Linear Technology DC/DC converter products: LTC1629-6, LTC3714, LTC3731 and LTC3778. (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.
APPLICATIO S
s s s
AMD Opteron Processor Power Supply Workstations and Servers Large Memory Array Supply
TM
TYPICAL APPLICATIO
5-Bit VID-Controlled High Current Application (Simplified Block Diagram)
VIN 4.5V TO 22V VIN LTC1629-6 VID0 VID1 FROM P VCC SENSE TG1 SW1 INTVCC VDIFFOUT SGND FB GND EAIN ITH TG2 SW2 BG2 VIN 4.5V TO 22V VIN LTC1629-6 TG1 SW1 BG1 PGND SGND EAIN ITH TG2 SW2 BG2
1706-61 TA01
L1
BG1 PGND VIN
VID2 LTC1706-61 VID3 VID4
L2
L3
VIN
L4
U
RSENSE1
U
U
+
VOUT 0.8V TO 1.55V UP TO 80A COUT
RSENSE2
RSENSE3
RSENSE4
170661f
1
LTC1706-61
ABSOLUTE MAXIMUM RATINGS
(Note 1)
PACKAGE/ORDER INFORMATION
TOP VIEW VID0 VID1 VID2 VID3 VCC 1 2 3 4 5 10 9 8 7 6 FB GND NC VID4 SENSE
(Voltages Referred to GND Pin) Input Supply Voltage (VCC) ..........................- 0.3V to 7V VID Input Pins .............................................- 0.3V to 7V SENSE Pin ...................................................- 0.3V to 7V FB Pin ..........................................................- 0.3V to 7V Operating Ambient Temperature Range (Note 2) .................................................. - 40C to 85C Junction Temperature ........................................... 110C Storage Temperature Range ................. - 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C
ORDER PART NUMBER LTC1706EMS-61 MS PART MARKING LTK9
MS PACKAGE 10-LEAD PLASTIC MSOP TJMAX = 110C, JA = 120C/ W
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS
The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25C. 2.7V VCC 5.5V, VID0 = VID1 = VID2 = VID3 = VID4 = NC unless otherwise specified.
SYMBOL VCC IVCC RFB-SENSE VOUT Error % RPULLUP VIDTH IVID-LEAK VPULLUP PARAMETER Operating Supply Voltage Range Supply Current Resistance Between SENSE and FB Output Voltage Accuracy VID Input Pull-Up Resistance VID Input Voltage Threshold VID Input Leakage Current VID Pull-Up Voltage CONDITIONS (Note 3)
q q
MIN 2.7 6 - 0.35
TYP 0.1 10 40
MAX 5.5 5 14 + 0.35 0.4
VDIODE = 0.6V (Note 4) VIL (2.7V VCC 5.5V) VIH (2.7V VCC 5.5V) VCC < VID < 7V (Note 4) VCC = 3.3V VCC = 5V
1.6 0.01 2.8 4.5 1
UNITS V A k % k V V A V V
Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC1706EMS-61 is guaranteed to meet performance specifications from 0C to 70C. Specifications over the - 40C to 85C operating temperature range are assured by design, characterization and correlation with statistical process controls.
Note 3: With all five VID inputs floating, the VCC supply current is simply the device leakage current. However, the VCC supply current will rise and be approximately equal to the number of grounded VID input pins times (VCC - 0.6V)/40k. (See the VID Input Characteristics section for more details.) Note 4: Each built-in pull-up resistor attached to the VID inputs also has a series diode connected to VCC to allow input voltages higher than the VCC supply without damage or clamping. (See Operation section for further details.)
170661f
2
U
W
U
U
WW
W
LTC1706-61 TYPICAL PERFORMANCE CHARACTERISTICS
IVID-PULLUP vs Temperature
140 120 100 80 60 40 20 -50 0 -50 0 2.5 VCC = 5V VID4 = 0V VID0 = VID1 = VID2 = VID3 = OPEN 2.0 ALL VID INPUTS OPEN 1.5
VID PULL-UP CURRENT (A)
SUPPLY CURRENT (A)
SUPPLY CURRENT (A)
0 50 TEMPERATURE (C)
VID VID Sense Accuracy
0.35 0.25
0.35 0.25
VIDACCURACY ( %)
VIDACCURACY ( %)
0.15 0.05 -0.05 -0.15 -0.25 -0.35 0.775 VCC = 5.5V VCC = 2.7V
0.05 -0.05 -0.15 -0.25 -0.35 -60 -40 -20 VSENSE = 0.8V VSENSE = 1.55V
RFB1 (k)
0.975
1.175
1.375
SENSE VOLTAGE (V)
1706-61 G04
PIN FUNCTIONS
VID0 (Pin 1): LSB Programming Input. Low = GND, High = VCC or Float. Grounding VID0 adds 25mV to the output sense voltage. VID1 (Pin 2): 4th MSB Programming Input. Low = GND, High = VCC or Float. Grounding VID1 adds 50mV to the output sense voltage. VID2 (Pin 3): 3rd MSB Programming Input. Low = GND, High = VCC or Float. Grounding VID2 adds 100mV to the output sense voltage. VID3 (Pin 4): 2nd MSB Programming Input. Low = GND, High = VCC or Float. Grounding VID3 adds 200mV to the output sense voltage. VCC (Pin 5): Power Supply Voltage. Range from 2.7V to 5.5V. SENSE (Pin 6): Regulator Output Voltage. Connect directly to regulator output sense node. VID4 (Pin 7): MSB Programming Input. Low = GND, High = VCC or Float. Grounding VID4 adds 400mV to the output sense voltage. NC (Pin 8): No Connect. GND (Pin 9): Ground. Connect to regulator signal ground. FB (Pin 10): Feedback Input. Connect to the 0.6V feedback pin of a compatible regulator.
170661f
UW
Supply Current vs Temperature
1.0
Supply Current vs Supply Voltage
ALL VID INPUTS OPEN TA = 25C
1.0 VCC = 5V 0.5 VCC = 3.3V
0.5
VCC = 2.7V
100
1706-61 G01
0 50 TEMPERATURE (C)
100
1706-61 G02
3.0
3.5 4.0 4.5 5.0 SUPPLY VOLTAGE (V)
5.5
6.0
1706-61 G03
VID Sense Accuracy vs Temperature
VCC = 5.5V 10.10
RFB1 vs Temperature
0.15 VSENSE = 1.15V
10.05
10.00
9.95
1.575
0
20
40
60
80
100
9.90 -50
TEMPERATURE (C)
1706-61 G05
0 50 TEMPERATURE (C)
100
1706-61 G06
U
U
U
3
LTC1706-61
PIN FUNCTIONS
PIN 1 2 3 4 5 6 7 8 9 10 NAME VID0 VID1 VID2 VID3 VCC SENSE VID4 NC GND FB Ground 0.6V Feedback Input 0 0 0.6 1.5 - 0.3 - 0.3 7 7 DESCRIPTION LSB Programmable Input 4th MSB Programmable Input 3rd MSB Programmable Input 2nd MSB Programmable Input Power Supply Regulator Output Voltage 1st MSB Programmable Input MIN 0 0 0 0 2.7 0.8 0 NOMINAL (V) TYP MAX VCC VCC VCC VCC 5.5 1.55 VCC ABSOLUTE MAX (V) MIN MAX - 0.3 - 0.3 - 0.3 - 0.3 - 0.3 - 0.3 - 0.3 7 7 7 7 7 7 7
BLOCK DIAGRA
VID0 1 VCC VCC 5
VID1 2 VCC SWITCH CONTROL LOGIC 40k VID2 3
VID3 4
OPERATIO
The LTC1706-61 is a precision resistive divider designed specifically for use with an entire family of Linear Technology Corporation DC/DC switching regulators with 0.6V internal reference and feedback voltage. The LTC1706-61 produces an output voltage ranging from 0.8V to 1.55V in 25mV steps by closing the loop between the output voltage sense and the feedback input of the regulator with the appropriate resistive divider network.
4
W
U
U
U
U
VCC
40k
40k RFB1
6
SENSE
10 FB RFB2 9 GND
1706-61 BD
VCC
VCC
40k VID4 7
40k
The "top" feedback resistor, RFB1, connected between SENSE and FB, is typically 10k and is not modified by the state of the VID program inputs. The "bottom" feedback resistor, RFB2, however, is modified by the five VID inputs and is precisely ratioed to RFB1.
170661f
LTC1706-61
OPERATIO
VID Programming A list of programmed inputs and their corresponding output voltages is shown in Table 1. Programming is accomplished by applying the proper voltage (or float condition) on the five digital VID inputs.
Table 1. VID Inputs and Corresponding Output Voltage
CODE 00000 00001 00010 00011 00100 00101 00110 00111 01000 01001 01010 01011 01100 01101 01110 01111 10000 10001 10010 10011 10100 10101 10110 10111 11000 11001 11010 11011 11100 11101 11110 11111 VID4 GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND GND Float Float Float Float Float Float Float Float Float Float Float Float Float Float Float Float VID3 GND GND GND GND GND GND GND GND Float Float Float Float Float Float Float Float GND GND GND GND GND GND GND GND Float Float Float Float Float Float Float Float VID2 GND GND GND GND Float Float Float Float GND GND GND GND Float Float Float Float GND GND GND GND Float Float Float Float GND GND GND GND Float Float Float Float VID1 GND GND Float Float GND GND Float Float GND GND Float Float GND GND Float Float GND GND Float Float GND GND Float Float GND GND Float Float GND GND Float Float VID0 GND Float GND Float GND Float GND Float GND Float GND Float GND Float GND Float GND Float GND Float GND Float GND Float GND Float GND Float GND Float GND Float OUTPUT 1.550V 1.525V 1.500V 1.475V 1.450V 1.425V 1.400V 1.375V 1.350V 1.325V 1.300V 1.275V 1.250V 1.225V 1.200V 1.175V 1.150V 1.125V 1.100V 1.075V 1.050V 1.025V 1.000V 0.975V 0.950V 0.925V 0.900V 0.875V 0.850V 0.825V 0.800V *0.775V
*Represents codes without a defined output (shutdown) voltage as specified in AMD specifications. The LTC1706-61 interprets these codes as a valid input and produces an output voltage as follows: (11111) = 0.775V.
U
When all five VID inputs are high or floating, such as when no CPU is present in a system, a regulated 0.775V output is generated at VSENSE. Each VID input pin is pulled up by a 40k resistor in series with a diode connected to VCC. Therefore, it should be grounded (or driven low) to produce a digital low input. It can either be floated or connected to VCC 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 VCC. Voltage Sensing and Feedback Pins The FB pin is a high impedance node that requires minimum layout distance to reduce extra loading and unwanted stray pickup. When used with the LTC1629-6, the LTC1706-61's FB, SENSE, VCC and GND pins should be connected, respectively, with the EAIN, VDIFFOUT, INTVCC and SGND pins of the LTC1629-6. 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. VID Input Characteristics The VID inputs should be driven with a maximum VIL of 0.4V and a minimum VIH of 1.6V. However, the VID input range is not limited to values less than VCC. Because of the internal diode between VCC and the pull-up resistor, the inputs can go higher than VCC without being clamped to VCC or damaging the input. This allows the LTC1706-61 to be fully logic compatible and operational over a higher input voltage range (less than the 7V absolute maximum rating). When a VID input is grounded, there will be a higher quiescent current flow from VCC because of a resistor from VCC through a series diode to each one of the inputs. This increase in quiescent current is calculated from: IQ = N(VCC - VDIODE)/RPULLUP N is the number of grounded VID inputs. VDIODE is typically 0.6V while RPULLUP has a typical pull-up resistance of 40k.
170661f
5
LTC1706-61
OPERATIO
In other words, each VID input has a typical pull-up current of 68A for a 3.3V system. Besides the LTC1629-6, the LTC1706-61 also programs a whole family of LTC DC/DC converters that have an onboard
TYPICAL APPLICATIO
2-Phase 12V Input, 0.8V to 1.55V/45A Max Power Supply with Adjustable Overvoltage Protection
VDD_CORE+ VCC
COMPARATOR
PWRGD ENABLE D1 BAT54 C1 0.1F RUN/SS C3 1nF LTC3719 1 2 3 4 5 R23 48.7k CLK1 C9 4.7nF R6 2.2k C10 220pF R24 107k INTVCC C14 470pF 6 7 8 9 10 11 12 13 14 Q9 (OPT) 2N7002 VID0 VID1 VID2 VID3 VID4 C17 1nF 15 16 17 18 RUN/SS SENSE1+ SENSE1- EAIN PLLFLTR PLLIN FCB ITH SGND VDIFFOUT VOS- VOS+ SENSE2 - SENSE2 + ATTENOUT NO_CPU VID0 VID1 PGOOD TG1 SW1 BOOST1 VIN BG1 EXTVCC INTVCC PGND BG2 BOOST2 SW2 TG2 ATTENIN VBIAS VID4 VID3 VID2 36 35 34 33 32 31 30 29 28 27 26 25 24 23 22 21 20 19 C18 0.1F R12 10 INTVCC C11 2.2F D3 BAT54A C12 10F C15 0.47F C7 1F C5 0.47F R1 10 5678 Q1 Si7448DP 1 2 3 x2 C2 0.47F 10 L1 0.8H D2 B320A 12VIN CIN1 10 R5 0.002 C8 0.47F VDD_CORE+ COUT1 R7 0.002 R8 50 C16 0.47F GND R9 50 COREFB_H GND
CIN1: SIX 10F 16V CERAMIC CAPACITORS COUT1: TEN 22F 6.3V CERAMIC CAPACITORS L1, L2: SUMIDA CEP125-1R0MC-H
6
+
OVP TO SYSTEM OVERVOLTAGE PROTECTION
-
U
U
0.6V reference. The LTC3714, LTC3778 and LTC3731 are just a few of the high efficiency step-down switching regulators that will work equally well with the LTC1706-61.
LTC1706-61 SENSE FB OVP THRESHOLD LOGIC VID0 VID1 VID2 VID3 VID4 FROM P 5678 Q2 Si7448DP 1 2 3 x3 5678 Q3 Si7448DP 1 2 3 x2 5678 Q4 Si7448DP 1 2 3 x3 C13 0.47F L2 0.8H D4 B320A 10 10
+
+
COREFB_L
1706-61 TA03
170661f
LTC1706-61
TYPICAL APPLICATIO
1F X5R 1 2 100k 3 4 1500pF 20k 5 6 7 0.01F 8 330k 9 10 5V 5 1 2 3 4 7 6 VID0 SENSE VID1 VID2 LTC1706-61 VID3 FB VID4 GND 10 9 VCC RUN/SS VON BOOST TG SW SENSE + SENSE - PGND BG DRVCC INTVCC VIN 20 19 18 17 16
PACKAGE DESCRIPTION
MS Package 10-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1661)
0.889 0.127 (.035 .005) 3.00 0.102 (.118 .004) (NOTE 3) 10 9 8 7 6 5.23 (.206) MIN 3.2 - 3.45 (.126 - .136) 0.254 (.010) 0.50 0.305 0.038 (.0197) (.0120 .0015) BSC TYP RECOMMENDED SOLDER PAD LAYOUT GAUGE PLANE 12345 0.53 0.01 (.021 .006) DETAIL "A" 0.18 (.007) NOTE: 1. DIMENSIONS IN MILLIMETER/(INCH) 2. DRAWING NOT TO SCALE 3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE 5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX SEATING PLANE 0.17 - 0.27 (.007 - .011) TYP 0.13 0.076 (.005 .003)
MSOP (MS) 0802
Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
U
U
0.8V to 1.55V VID Programmable 15A Power Supply
VIN 12V CMDSH-3 LTC3778 0.22F 10F 16V X5R x4 IRF7811 PGOOD VRNG ITH FCB SGND ION VFB EXTVCC 0.68H SP 270F 2V x3 VOUT 0.8V TO 1.55V 15A 22F 6.3V X5R B320A 15 IRF7811 14 13 4.7F X5R 6.3V 12 11 1 VIN 0.1F 22pF FROM P
1706-61 TA02
0.497 0.076 (.0196 .003) REF
DETAIL "A" 0 - 6 TYP
4.90 0.15 (1.93 .006)
3.00 0.102 (.118 .004) NOTE 4
1.10 (.043) MAX
0.86 (.034) REF
0.50 (.0197) BSC
170661f
7
LTC1706-61
TYPICAL APPLICATION
VID Controlled High Current 70A 4-Phase Application
OPTIONAL SYNC CLOCK IN 1 0.33F 2 3 1000pF 4 5 1 2 FROM P 3 4 7 VCC VID0 VID1 VID2 VID3 100pF VID4 GND 9 FB 10 SENSE LTC1706-61 6 47k 6800pF 0.33F 5 6 7 8 9 10 11 12 1000pF 13 14 RUN/SS SENSE1+ SENSE1- EAIN PLLFLTR PLLIN PHASMD ITH LTC1629-6 CLKOUT TG1 SW1 BOOST1 VIN BG1 EXTVCC INTVCC PGND BG2 BOOST2 SW2 TG2 AMPMD 28 27 26 25 24 23 22 21 20 19 18 17 16 15 L2 24k 75k 0.47F M5 M6 M4 D7 D8 1F 1F 25V 150F, 16V x2 0.47F 10 M2 M3 M1 D1 MBRS 340T3 5V 0.003 L1
100pF VDIFFOUT VOS- VOS+
SGND VDIFFOUT VOS- VOS+ SENSE2- SENSE2+
1 2 1000pF 47pF 10k 0.01F 3 4 5 6 7
RUN/SS SENSE1+ SENSE1- EAIN PLLFLTR PLLIN
CLKOUT TG1 SW1 BOOST1 VIN BG1
28 27 26 25 24 23 22 21 20 19 18 17 16 15 0.47F M10 M11 D9 D10 1F 1F 25V 150F, 16V x2 22F 6.3V 0.47F 10 M7 M8 5V
47pF
VDIFFOUT VOS- VOS+ M1 TO M12: FDS7760A L1 TO L4: 1H SUMIDA CEPH149-IROMC D7 TO D10: CENTROI CMDSH-3TR COUT: KEMET T510X477M006AS fSW: 200kHz 1000pF
RELATED PARTS
PART NUMBER LTC1629-6 LTC3714 LTC3716 LTC3719 LTC3731 LTC3733 LTC3778 DESCRIPTION PolyPhase(R) Synchronous Step-Down Controller Single Phase Synchronous Step-Down Controller with VID 2-Phase Synchronous Step-Down Controller with VID AMD Opteron CPU Power Supply 3-Phase, 60A Synchronous Step-Down Controller 3-Phase, 60A Synchronous Step-Down Controller for AMD Opteron Processors Optional RSENSE Synchronous Step-Down Controller COMMENTS Up to 12-Phase Operation, Up to 200A Power Supply 0.6V VOUT 1.75V, IOUT 25A 0.6V VOUT 1.75V, IOUT 40A 0.8V VOUT 1.55V, IOUT 40A Single IC 60A Solution with Onboard MOSFET Drivers, 5% Output Current Matching for Optimum Thermal Performance and Reliability On-Board VID and MOSFET Drivers, 0.8V VOUT 1.55V, IOUT 60A 4V VIN 36V, 0.6V VOUT (0.9)VIN, IOUT 25A
170661f
PolyPhase is a registered trademark of Linear Technology Corporation.
8
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 q FAX: (408) 434-0507
q
www.linear.com
+
EXTVCC PHASMD 8 LTC1629-6 INTVCC ITH 9 PGND SGND 10 BG2 VDIFFOUT 11 BOOST2 VOS- 12 SW2 VOS+ 13 TG2 SENSE2- 14 AMPMD SENSE2+
+
U
22F 6.3V
+
COUT 470F, 6.3V x3 D2 MBRS 340T3 0.003
+
GND
VOUT 0.8V TO 1.55V 70A
L3 0.003 D3 MBRS 340T3 COUT 470F, 6.3V x3
M9
+
GND
+
VIN 12V D4 MBRS 340T3 0.003 L4
1706-61 TA04
M12
LT/TP 0603 1K * PRINTED IN USA
(c) LINEAR TECHNOLOGY CORPORATION 2002

▲Up To Search▲

Price & Availability of LTC1706-61

	To Download LTC1706-61 Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .