LTC1706-61_技术文档

LTC1706-61

5-Bit VID Voltage

Programmer for AMD

Opteron CPUs

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FEATURES

DESCRIPTIO

The LTC^®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.

■

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

The LTC1706-61 is designed specifically to program

an entire family of Linear Technology DC/DC converters

with on board 0.6V references.

■

Available in MSOP-10 Package

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APPLICATIO S

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.)

AMD Opteron^TMProcessor Power Supply

■

Workstations and Servers

■

Large Memory Array Supply

, LTC and LT are registered trademarks of Linear Technology Corporation.

AMD Opteron is a trademark of Advanced Micro Devices, Inc.

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TYPICAL APPLICATIO

5-Bit VID-Controlled High Current Application (Simplified Block Diagram)

V

IN

4.5V TO 22V

V

IN

LTC1629-6

TG1

SW1

L1

L2

R

V

SENSE1

SENSE2

OUT

0.8V TO 1.55V

UP TO 80A

V

CC

VID0

VID1

VID2

VID3

VID4

+

INTV

V

CC

BG1

C

OUT

SENSE

V

IN

DIFFOUT

SGND

PGND

FROM

µP

LTC1706-61

TG2

SW2

BG2

FB

EAIN

GND

I

TH

V

IN

4.5V TO 22V

V

IN

LTC1629-6

TG1

SW1

R

L3

L4

SENSE3

BG1

V

IN

PGND

SGND

EAIN

TG2

SW2

BG2

R

SENSE4

I

TH

1706-61 TA01

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LTC1706-61

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ABSOLUTE MAXIMUM RATINGS

PACKAGE/ORDER INFORMATION

(Note 1)

ORDER PART

NUMBER

(Voltages Referred to GND Pin)

TOP VIEW

Input Supply Voltage (V_CC) ..........................–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

VID0

VID1

VID2

VID3

1

2

3

4

5

10 FB

9

8

7

6

GND

LTC1706EMS-61

NC

VID4

SENSE

V

CC

MS

MS PACKAGE

10-LEAD PLASTIC MSOP

T_JMAX= 110°C, θ_JA= 120°C/ W

PART MARKING

(Note 2) .................................................. –40°C to 85°C

Junction Temperature........................................... 110°C

Storage Temperature Range ................. –65°C to 150°C

Lead Temperature (Soldering, 10 sec).................. 300°C

LTK9

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 = 25°C.

A

2.7V ≤ V_CC≤ 5.5V, VID0 = VID1 = VID2 = VID3 = VID4 = NC unless otherwise specified.

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP MAX UNITS

V

Operating Supply Voltage Range

Supply Current

Resistance Between SENSE and FB

2.7

5.5

5

14

V

µA

kΩ

%

CC

I

(Note 3)

0.1

10

VCC

R

V

●

6

FB-SENSE

Error % Output Voltage Accuracy

–0.35

+ 0.35

OUT

R

VID

VID Input Pull-Up Resistance

VID Input Voltage Threshold

V

= 0.6V (Note 4)

DIODE

40

kΩ

V

PULLUP

(2.7V ≤ V ≤ 5.5V)

0.4

TH

IL

CC

(2.7V ≤ V ≤ 5.5V)

1.6

IH

CC

I

V

VID Input Leakage Current

VID Pull-Up Voltage

V

< VID < 7V (Note 4)

= 3.3V

= 5V

0.01

2.8

4.5

±1

µA

V

VID-LEAK

CC

PULLUP

CC

Note 1: Absolute Maximum Ratings are those values beyond which the life

of a device may be impaired.

Note 3: With all five VID inputs floating, the V supply current is simply

CC

the device leakage current. However, the V supply current will rise and

CC

be approximately equal to the number of grounded VID input pins times

Note 2: The LTC1706EMS-61 is guaranteed to meet performance

specifications from 0°C to 70°C. Specifications over the –40°C to 85°C

operating temperature range are assured by design, characterization and

correlation with statistical process controls.

(V – 0.6V)/40k. (See the VID Input Characteristics section for more

CC

details.)

Note 4: Each built-in pull-up resistor attached to the VID inputs also has a

series diode connected to V to allow input voltages higher than the V

CC

supply without damage or clamping. (See Operation section for further

details.)

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LTC1706-61

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TYPICAL PERFORMANCE CHARACTERISTICS

Supply Current vs Supply Voltage

I_VID-PULLUPvs Temperature

Supply Current vs Temperature

1.0

0.5

0

2.0

1.5

1.0

0.5

0

140

120

100

80

ALL VID INPUTS OPEN

A

ALL VID INPUTS OPEN

V

= 5V

CC

T

= 25°C

VID4 = 0V

VID0 = VID1 = VID2 = VID3 = OPEN

V

CC

= 5V

V

CC

= 3.3V

60

V

CC

= 2.7V

40

20

2.5 3.0

3.5 4.0

4.5 5.0 5.5 6.0

–50

0

50

100

–50

0

50

100

SUPPLY VOLTAGE (V)

TEMPERATURE (°C)

1706-61 G03

1706-61 G02

1706-61 G01

VID

VID Sense Accuracy vs

Temperature

VID Sense Accuracy

R_FB1vs Temperature

0.35

0.25

10.10

10.05

10.00

9.95

0.35

0.25

V

CC

= 5.5V

0.15

V

= 1.15V

SENSE

V

= 5.5V

CC

0.05

V

= 0.8V

SENSE

= 2.7V

CC

–0.05

–0.15

–0.25

–0.35

V

= 1.55V

–0.05

–0.15

–0.25

–0.35

SENSE

9.90

–40 –20

0

20 40

80 100

–60

60

–50

0

50

100

0.975

1.175

1.375

1.575

0.775

TEMPERATURE (°C)

SENSE VOLTAGE (V)

1706-61 G05

1706-61 G06

1706-61 G04

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PIN FUNCTIONS

VID0 (Pin 1): LSB Programming Input. Low = GND,

High = V_CCor Float. Grounding VID0 adds 25mV

to the output sense voltage.

V_CC(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.

VID1 (Pin 2): 4th MSB Programming Input. Low = GND,

High = V_CCor Float. Grounding VID1 adds 50mV

to the output sense voltage.

VID4 (Pin 7): MSB Programming Input. Low = GND, High

= V_CCor Float. Grounding VID4 adds 400mV to the output

sense voltage.

VID2 (Pin 3): 3rd MSB Programming Input. Low = GND,

High = V_CCor Float. Grounding VID2 adds 100mV

to the output sense voltage.

NC (Pin 8): No Connect.

GND (Pin 9): Ground. Connect to regulator signal ground.

FB(Pin10):FeedbackInput. Connecttothe0.6Vfeedback

VID3 (Pin 4): 2nd MSB Programming Input. Low = GND,

High = V_CCor Float. Grounding VID3 adds 200mV

to the output sense voltage.

pin of a compatible regulator.

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LTC1706-61

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PIN FUNCTIONS

NOMINAL (V)

TYP

ABSOLUTE MAX (V)

1

NAME

VID0

VID1

VID2

VID3

DESCRIPTION

MIN

0

MAX

MIN

–0.3

MAX

LSB Programmable Input

4th MSB Programmable Input

3rd MSB Programmable Input

2nd MSB Programmable Input

Power Supply

V

7

CC

2

0

3

0

4

0

5

V

2.7

0.8

0

5.5

CC

6

SENSE

VID4

NC

Regulator Output Voltage

1st MSB Programmable Input

1.55

7

V

CC

8

9

GND

FB

Ground

0

–0.3

7

10

0.6V Feedback Input

0

0.6

1.5

W

BLOCK DIAGRA

V

CC

40k

VID0

VID1

VID2

VID3

1

2

3

4

V

CC

V

5

6

SENSE

R

FB1

10 FB

SWITCH

CONTROL

LOGIC

FB2

9

GND

1706-61 BD

V

CC

40k

VID4

7

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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.

The “top” feedback resistor, R_FB1, connected between

SENSE and FB, is typically 10k and is not modified by the

state of the VID program inputs.

The “bottom” feedback resistor, R_FB2, however, is modi-

fied by the five VID inputs and is precisely ratioed to R_FB1

.

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LTC1706-61

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OPERATIO

VID Programming

When all five VID inputs are high or floating, such as when

no CPU is present in a system, a regulated 0.775V output

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.

is generated at V_SENSE

.

Each VID input pin is pulled up by a 40k resistor in series

with a diode connected to V_CC. Therefore, it should be

grounded (or driven low) to produce a digital low input. It

can either be floated or connected to V_CCto 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 V_CC.

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

Float

VID3

GND

Float

GND

Float

VID2

GND

Float

GND

Float

GND

Float

GND

Float

VID1

GND

Float

GND

Float

GND

Float

GND

Float

GND

Float

GND

Float

GND

Float

GND

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

Voltage Sensing and Feedback Pins

The FB pin is a high impedance node that requires mini-

mum layout distance to reduce extra loading and

unwanted stray pickup.

When used with the LTC1629-6, the LTC1706-61’s FB,

SENSE, V_CCand GND pins should be connected, respec-

tively, with the EAIN, V_DIFFOUT, INTV_CCand 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 V_ILof

0.4V and a minimum V_IHof 1.6V. However, the VID input

range is not limited to values less than V_CC. Because of the

internal diode between V_CCand the pull-up resistor, the

inputs can go higher than V_CCwithout being clamped to

V

_CCor 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

quiescentcurrentflowfromV_CCbecauseofaresistorfrom

V_CCthrough a series diode to each one of the inputs. This

increase in quiescent current is calculated from:

I_Q= N(V_CC– V_DIODE)/R_PULLUP

NisthenumberofgroundedVIDinputs.V_DIODEistypically

0.6V while R_PULLUPhas a typical pull-up resistance of

40kΩ.

*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.

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LTC1706-61

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OPERATIO

Inotherwords,eachVIDinputhasatypicalpull-upcurrent

0.6V reference. The LTC3714, LTC3778 and LTC3731 are

just a few of the high efficiency step-down switching

regulatorsthatwillworkequallywellwiththeLTC1706-61.

of 68µA for a 3.3V system.

Besides the LTC1629-6, the LTC1706-61 also programs a

wholefamilyofLTCDC/DCconvertersthathaveanonboard

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TYPICAL APPLICATIO

2-Phase 12V Input, 0.8V to 1.55V/45A Max Power Supply with Adjustable Overvoltage Protection

V

CC

+

V

_

DD CORE

LTC1706-61

SENSE

FB

VID0

VID1

VID2

VID3

VID4

–

+

FROM

µP

OVP

TO SYSTEM

OVERVOLTAGE

PROTECTION

LOGIC

OVP

THRESHOLD

COMPARATOR

PWRGD

ENABLE

RUN/SS

R1

10Ω

D1

C3

LTC3719

BAT54

1nF

1

2

36

35

34

33

32

31

30

29

28

27

26

25

24

23

22

21

20

19

12V

IN

RUN/SS

PGOOD

TG1

5

6

2

7

3

8

Q1

Si7448DP

×2

C2

C

IN1

+

0.47µF

SENSE1

EAIN

C1

0.1µF

10Ω

GND

10Ω

3

–

1

SW1

L1

0.8µH

C5

0.47µF

R5

0.002Ω

4

BOOST1

C7 1µF

5

PLLFLTR

PLLIN

FCB

V

IN

5

1

6

2

7

3

8

R23 48.7k

C9 4.7nF

D2

B320A

6

Q2

C8

0.47µF

CLK1

BG1

Si7448DP

×3

INTV

CC

C11

2.2µF

7

D3

BAT54A

EXTV

CC

8

R6 2.2k

+

C12

I

INTV

+

TH

CC

V

_

DD CORE

C10 220pF

10µF

C13

+

9

5

6

7

8

Q3

Si7448DP

×2

SGND

PGND

BG2

0.47µF

C

OUT1

C14 470pF

10

11

12

13

14

15

16

17

18

L2

0.8µH

GND

R9

50Ω

V

R7

0.002Ω

R24

107k

C15

0.47µF

DIFFOUT

1

5

2

6

3

7

R8

50Ω

–

V

BOOST2

SW2

OS

8

Q4

Si7448DP

×3

+

C16

0.47µF

INTV

COREFB_H

D4

B320A

CC

–

+

SENSE2

TG2

R12 10Ω

1

2

3

ATTENIN

10Ω

Q9 (OPT)

2N7002

C17

1nF

ATTENOUT

NO_CPU

VID0

V

BIAS

C18

0.1µF

VID4

VID3

VID2

VID0

VID1

VID2

VID3

VID4

VID1

COREFB_L

C

: SIX 10µF 16V CERAMIC CAPACITORS

IN1

: TEN 22µF 6.3V CERAMIC CAPACITORS

OUT1

L1, L2: SUMIDA CEP125-1R0MC-H

1706-61 TA03

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LTC1706-61

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TYPICAL APPLICATIO

0.8V to 1.55V VID Programmable 15A Power Supply

V

1µF

IN

12V

X5R

CMDSH-3

10µF

16V

X5R

×4

1

2

20

19

18

17

16

15

14

13

12

11

RUN/SS

BOOST

TG

LTC3778

V

ON

IRF7811

0.22µF

100k

3

PGOOD

SW

0.68µH

V

OUT

4

+

0.8V TO 1.55V

15A

V

SENSE

RNG

1500pF

SP

270µF

2V

20k

5

–

I

SENSE

TH

B320A

IRF7811

22µF

6.3V

X5R

6

×3

FCB

PGND

BG

22pF

0.01µF

7

SGND

4.7µF

X5R

6.3V

8

I

DRV

INTV

ON

CC

9

330k

V

FB

1Ω

10

V

IN

EXTV

V

IN

CC

5V

0.1µF

5

V

CC

1

2

3

4

7

6

VID0

VID1

VID2

VID3

VID4

SENSE

FROM

µP

LTC1706-61

FB

GND

9

10

1706-61 TA02

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PACKAGE DESCRIPTION

MS Package

10-Lead Plastic MSOP

(Reference LTC DWG # 05-08-1661)

3.00 ± 0.102

(.118 ± .004)

(NOTE 3)

0.889 ± 0.127

(.035 ± .005)

0.497 ± 0.076

(.0196 ± .003)

REF

10 9

8

7 6

5.23

3.2 – 3.45

(.206)

(.126 – .136)

MIN

3.00 ± 0.102

(.118 ± .004)

NOTE 4

4.90 ± 0.15

(1.93 ± .006)

DETAIL “A”

0.254

(.010)

0° – 6° TYP

0.50

(.0197)

BSC

0.305 ± 0.038

(.0120 ± .0015)

TYP

GAUGE PLANE

1

2

3

4 5

RECOMMENDED SOLDER PAD LAYOUT

0.53 ± 0.01

(.021 ± .006)

0.86

(.034)

REF

1.10

(.043)

MAX

DETAIL “A”

0.18

(.007)

SEATING

PLANE

NOTE:

0.17 – 0.27

(.007 – .011)

TYP

0.13 ± 0.076

(.005 ± .003)

MSOP (MS) 0802

1. DIMENSIONS IN MILLIMETER/(INCH)

2. DRAWING NOT TO SCALE

0.50

(.0197)

BSC

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

170661f

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 represen-

tationthattheinterconnectionofitscircuitsasdescribedhereinwillnotinfringeonexistingpatentrights.

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LTC1706-61

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TYPICAL APPLICATION

VID Controlled High Current 70A 4-Phase Application

OPTIONAL SYNC

CLOCK IN

L1

1

2

3

4

5

6

7

8

9

28

27

26

25

24

23

22

21

20

19

18

17

16

15

RUN/SS

SENSE1

EAIN

CLKOUT

TG1

5V

+

–

0.003Ω

0.33µF

SW1

1000pF

0.47µF

D1

M1

BOOST1

MBRS

340T3

10Ω

5

PLLFLTR

PLLIN

V

IN

M2

M3

V

CC

1µF

1

2

3

4

7

0.33µF

BG1

VID0

VID1

VID2

VID3

VID4

6

150µF, 16V

× 2

1µF

25V

PHASMD

SENSE

EXTV

CC

47k

D7

D8

+

V

OUT

6800pF

LTC1629-6

22µF

6.3V

I

+

C

0.8V TO

1.55V

70A

TH

SGND

INTV

CC

OUT

FROM

µP

470µF, 6.3V

+

GND

LTC1706-61

100pF

V

PGND

BG2

× 3

10

11

12

13

14

DIFFOUT

V

DIFFOUT

–

V

OS

100pF

–

D2

M4

OS

BOOST2

SW2

+

MBRS

340T3

V

0.47µF

FB

+

10

OS

M5

GND

9

M6

1000pF

–

SENSE2

TG2

0.003Ω

+

AMPMD

L2

24k

75k

L3

1

2

28

27

26

25

24

23

22

21

20

19

18

17

16

15

RUN/SS

CLKOUT

TG1

5V

0.003Ω

+

SENSE1

EAIN

1000pF

10k

3

–

SW1

47pF

D3

MBRS

340T3

4

0.47µF

BOOST1

M7

10Ω

5

PLLFLTR

PLLIN

V

IN

M9

M8

0.01µF

1µF

6

C

OUT

BG1

150µF, 16V

× 2

470µF, 6.3V

× 3

7

PHASMD

EXTV

CC

1µF

25V

D9

47pF

8

LTC1629-6

22µF

6.3V

I

TH

INTV

CC

+

9

D10

GND

SGND

PGND

BG2

V

IN

12V

10

11

12

13

14

V

DIFFOUT

V

DIFFOUT

–

V

D4

MBRS

340T3

OS

BOOST2

SW2

M10

OS

0.47µF

+

V

M12

M11

OS

–

SENSE2

TG2

1000pF

0.003Ω

M1 TO M12: FDS7760A

+

AMPMD

L1 TO L4: 1µH SUMIDA CEPH149-IROMC

D7 TO D10: CENTROI CMDSH-3TR

L4

C

f

: KEMET T510X477M006AS

OUT

: 200kHz

1706-61 TA04

SW

RELATED PARTS

PART NUMBER

LTC1629-6

LTC3714

DESCRIPTION

PolyPhase^®Synchronous Step-Down Controller

Single Phase Synchronous Step-Down Controller with VID 0.6V ≤ V

COMMENTS

Up to 12-Phase Operation, Up to 200A Power Supply

≤ 1.75V, I

≤ 1.55V, I

≤ 25A

≤ 40A

OUT

LTC3716

2-Phase Synchronous Step-Down Controller with VID

AMD Opteron CPU Power Supply

0.6V ≤ V

0.8V ≤ V

LTC3719

LTC3731

3-Phase, 60A Synchronous Step-Down Controller

Single IC 60A Solution with Onboard MOSFET Drivers, ±5% Output

Current Matching for Optimum Thermal Performance and Reliability

LTC3733

LTC3778

3-Phase, 60A Synchronous Step-Down Controller for

AMD Opteron Processors

On-Board VID and MOSFET Drivers, 0.8V ≤ V

≤ 1.55V, I

≤ 60A

OUT

Optional R

Synchronous Step-Down Controller

4V ≤ V ≤ 36V, 0.6V ≤ V

≤ (0.9)V , I

≤ 25A

SENSE

IN

OUT

IN OUT

PolyPhase is a registered trademark of Linear Technology Corporation.

170661f

LT/TP 0603 1K • PRINTED IN USA

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

8

●

(408) 432-1900 FAX: (408) 434-0507 www.linear.com

LINEAR TECHNOLOGY CORPORATION 2002


型号：	LTC1706-61
厂家：	Linear
描述：	5-Bit VID Voltage Programmer for AMD Opteron CPUs 5位VID电压编程器的AMD皓龙处理器
文件：	总8页 (文件大小：182K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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