LTC1706-63_技术文档

LTC1706-63

5-Bit VID Voltage

Programmer for SunCPUs

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FEATURES

DESCRIPTIO

The LTC^®1706-63 is a precision, digitally programmed,

resistive ladder which adjusts the output of any 0.6V

referenced regulator. Depending on the state of the five

VIDinputs,anoutputvoltagebetween1.025Vand1.4125V

is programmed in 12.5mV increments.

■

Programs Regulator Output Voltage Range from

1.025V to 1.4125V in 12.5mV 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 LTC1706-63 is designed specifically to program

an entire family of Linear Technology DC/DC converters

withonboard0.6Vreferences.Pleaseseetherelatedparts

list at the end of the data sheet.

■

Available in MSOP-10 Package

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APPLICATIO S

Sun^TMProcessor Power Supply

For a 2-phase synchronous controller with on-board

LTC1706-63, see the LTC3819.

■

Workstations and Servers

■

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

All other trademarks are the property of their respective owners.

Large Memory Array Supply

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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

1.025V TO 1.4125V

UP TO 80A

V

CC

VID0

VID1

VID2

VID3

VID4

+

INTV

V

CC

BG1

C

OUT

SENSE

V

IN

DIFFOUT

SGND

PGND

FROM

µP

LTC1706-63

TG2

SW2

BG2

FB

EAIN

R

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

1706-63 TA01

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LTC1706-63

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ABSOLUTE MAXIMUM RATINGS

PACKAGE/ORDER INFORMATION

(Note 1)

TOP VIEW

(Voltages Referred to GND Pin)

VID0

VID1

VID2

VID3

1

2

3

4

5

10 FB

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

9

8

7

6

GND

NC

VID4

SENSE

V

CC

MS PACKAGE

10-LEAD PLASTIC MSOP

T_JMAX= 110°C, θ_JA= 120°C/ W

(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

MS PART MARKING

LTBXM

ORDER PART NUMBER

LTC1706EMS-63

Order Options Tape and Reel: Add #TR

Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF

Lead Free Part Marking: http://www.linear.com/leadfree/

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

CC

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP MAX UNITS

V

Operating Supply Voltage Range

Supply Current

Resistance Between SENSE and FB

2.7

5.5

5

7

V

µA

kΩ

%

CC

I

(Note 3)

0.1

5

VCC

R

V

●

3

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-63 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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LTC1706-63

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TYPICAL PERFORMANCE CHARACTERISTICS

Supply Current vs Supply Voltage

I

vs Temperature

Supply Current vs Temperature

VID-PULLUP

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

= 5V

CC

V

= 3.3V

60

CC

V

= 2.7V

CC

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)

1706-63 G03

1706-63 G02

1706-63 G01

VID

VID Sense Accuracy vs

Temperature

VID Sense Accuracy

R

vs Temperature

FB1

0.35

0.25

5.500

5.250

5.000

4.975

4.950

0.35

0.25

V

CC

= 5.5V

0.15

V

= 1.225V

SENSE

V

= 5.5V

CC

0.05

V

= 1.025V

SENSE

= 2.7V

CC

–0.05

–0.15

–0.25

–0.35

–0.05

–0.15

–0.25

–0.35

V

= 1.4125V

SENSE

–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)

1706-63 G05

1706-63 G06

1706-63 G04

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PIN FUNCTIONS

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

High = V_CCor Float. Grounding VID0 adds 12.5mV

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 25mV

to the output sense voltage.

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

= V_CCor Float. Grounding VID4 adds 200mV to the output

sense voltage.

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

High = V_CCor Float. Grounding VID2 adds 50mV

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 100mV

to the output sense voltage.

pin of a compatible regulator.

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LTC1706-63

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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

FB2

10 FB

SWITCH

CONTROL

LOGIC

9

GND

1706-63 BD

V

CC

40k

VID4

7

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OPERATIO

The LTC1706-63 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

LTC1706-63 produces an output voltage ranging from

1.025V to 1.4125V in 12.5mV 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 5k 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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LTC1706-63

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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 1.025V 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

1.4125V

1.4000V

1.3875V

1.3750V

1.3625V

1.3500V

1.3375V

1.3250V

1.3125V

1.3000V

1.2875V

1.2750V

1.2625V

1.2500V

1.2375V

1.2250V

1.2125V

1.2000V

1.1875V

1.1750V

1.1625V

1.1500V

1.1375V

1.1250V

1.1125V

1.1000V

1.0875V

1.0750V

1.0625V

1.0500V

1.0375V

1.0250V

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 LTC1706-63’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 LTC1706-63 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.

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LTC1706-63

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OPERATIO

Inotherwords,eachVIDinputhasatypicalpull-upcurrent

LTC3731 are just a few of the high efficiency step-down

switching regulators that will work equally well with the

LTC1706-63. The LTC3819 is a VID controlled 2-phase

synchronous step-down controller with on-board

LTC1706-63.

of 68µA for a 3.3V system.

Besides the LTC1629-6, the LTC1706-63 also programs

a whole family of LTC DC/DC converters that have an

on-board 0.6V reference. The LTC3714, LTC3778 and

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TYPICAL APPLICATIO

2-Phase 12V Input, 1.025V to 1.4125V/45A Max Power Supply (LTC3819)

with Adjustable Overvoltage Protection (LTC1706-63)

V

CC

+

V

_

DD CORE

LTC1706-63

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

LTC3819

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

C2

Q1

×2

C

IN1

+

0.47µF

SENSE1

EAIN

C1

0.1µF

10Ω

GND

10Ω

3

–

SW1

L1

0.8µH

C5

0.47µF

R5

0.002Ω

4

BOOST1

C7 1µF

5

PLLFLTR

PLLIN

FCB

V

IN

R23 48.7k

C9 4.7nF

D2

B320A

6

Q2

×3

C8

0.47µF

CLK1

BG1

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

Q3

×2

SGND

PGND

BG2

0.47µF

C

OUT1

C14 470pF

10

11

12

13

14

15

16

17

18

L2

0.8µH

GND

V

R7

0.002Ω

R24

107k

C15

0.47µF

DIFFOUT

R8

50Ω

R9

50Ω

–

V

BOOST2

SW2

OS

+

C16

0.47µF

INTV

COREFB_H

D4

B320A

Q4

×3

CC

–

+

SENSE2

TG2

R12 10Ω

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

OUT1

IN1

: TEN 22µF 6.3V CERAMIC CAPACITORS

L1, L2: SUMIDA CEP125-1R0MC-H

Q1, Q3: TWO Si7448DP IN PARALLEL

Q2, Q4: THREE Si7448DP IN PARALLEL

1706-63 TA03

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LTC1706-63

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TYPICAL APPLICATIO

1.025V to 1.4125V 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

+

1.025V TO 1.4125V

15A

V

SENSE

RNG

1500pF

20k

SP

270µF

2V

5

–

I

SENSE

TH

B320A

IRF7811

22µF

6.3V

X5R

6

×3

FCB

PGND

BG

22pF

7

SGND

0.01µF

4.7µF

X5R

6.3V

8

I

DRV

ON

CC

9

330k

V

INTV

FB

1Ω

10

V

EXTV

V

IN

CC

5V

0.1µF

5

V

CC

1

2

3

4

7

6

VID0

VID1

VID2

VID3

VID4

SENSE

1706-63 TA02

FROM

µP

LTC1706-63

FB

GND

9

10

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PACKAGE DESCRIPTION

MS Package

10-Lead Plastic MSOP

(Reference LTC DWG # 05-08-1661)

3.00 ± 0.102

0.889 ± 0.127

(.035 ± .005)

(.118 ± .004)

(NOTE 3)

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

170663f

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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LTC1706-63

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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

M2

M3

IN

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

1.025V TO

1.4125V

70A

TH

SGND

INTV

CC

OUT

FROM

µP

470µF, 6.3V

+

GND

LTC1706-63

100pF

V

PGND

BG2

× 3

10

11

12

13

14

DIFFOUT

V

DIFFOUT

–

V

OS

–

D2

MBRS

340T3

M4

OS

BOOST2

SW2

100pF

+

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

M9

IN

M8

0.01µF

1µF

6

C

BG1

OUT

150µF, 16V

× 2

470µF, 6.3V

× 3

7

PHASMD

EXTV

CC

1µF

25V

D9

47pF

8

LTC1629-6

22µF

6.3V

I

INTV

CC

+

TH

+

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

+

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

1706-63 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

≤ 25A

≤ 40A

OUT

LTC3716

2-Phase Synchronous Step-Down Controller with VID

3-Phase, 60A Synchronous Step-Down Controller

0.6V ≤ V

OUT

LTC3731

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 ≤ V ≤ 1.55V, I ≤ 60A

LTC3733

LTC3778

LTC3819

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

AMD Opteron Processors

OUT

Optional R

DC/DC Synchronous Controller

Current Mode Operation with R

or MOSFET R

Sensing,

DC(0N)

SENSE

4.5V ≤ V ≤ 36V

IN

2-Phase Synchronous Step-Down Controller

1.025V ≤ V

≤ 1.4125V; 40A

OUT

PolyPhase is a registered trademark of Linear Technology Corporation.

170663f

LT 1005 • PRINTED IN USA

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

8

●

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


型号：	LTC1706-63
厂家：	Linear Systems
描述：	5-Bit VID Voltage Programmer for Sun CPUs 5位VID电压编程器对Sun的CPU
文件：	总8页 (文件大小：161K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

LTC1706-63 [Linear Systems]

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