DC1811B-A – LTM4676 Dual Step-Down µModule Regulator with

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DEMO MANUAL DC1811B-A

Description

LTM4676 Dual Step-Down µModule

Regulator with PMBus Digital Power System Management

Demonstration circuit 1811B-A is a dual-output, high efficiency, high density, µModule® regulator with 4.5V to 26.5V input range. Each output can supply 13A maximum load current. The demo board has a LTM®4676 µModule regulator, which is a dual 13A or single 26A step-down regulator with PMBus power system management. Please see LTM4676 data sheet for more detailed information

The DC1811B-A powers up to default settings and produces power based on configuration resistors without the need for any serial bus communication. This allows easy evaluation of the DC/DC converter. To fully explore the extensive power system management features of the part, download the GUI software LTpowerPlay™ onto your PC and use LTC’s I2C/SMBus/PMBus dongle DC1613A to connect to the board.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and LTpowerPlay is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.

BoarD photo

Figure 1. Dual-Output LTM4676/DC1811B-A Demo Circuit

LTpowerPlay allows the user to reconfigure the part on the fly and store the configuration in EEPROM, view telemetry of voltage, current, temperature and fault status

GUI Download

The software can be downloaded from:

http://www.linear.com/ltpowerplay

For more details and instructions of LTpowerPlay, please refer to LTpowerPlay GUI for LTM4676 Quick Start Guide.

Design files for this circuit board are available at http://www.linear.com/demo/DC1811BA

http://www.linear.com/LTM4676

http://www.linear.com/demo

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Quick start proceDure

performance summary (TA = 25°C)

PARAMETER CONDITION VALUE

Input Voltage Range 4.5V to 26.5V

Output Voltage, VOUT0 VIN = 4.5V to 26.5V, IOUT0 = 0A to 13A 0.5V to 4V, Default: 1V

Maximum Output Current, IOUT0 VIN = 4.5V to 26.5V, VOUT = 0.5V to 4V 13A

Output Voltage, VOUT1 VIN = 4.5V to 26.5V, IOUT1 = 0A to 13A 0.5V to 5.4V, Default: 1.8V

Maximum Output Current, IOUT1 VIN = 4.5V to 26.5V, VOUT = 0.5V to 5.4V 13A

Typical Efficiency VIN = 12V, VOUT = 1.8V, IOUT = 13A 86.3%

Default Switching Frequency 500kHz

Demonstration circuit 1811B-A is easy to set up to evalu-ate the performance of the LTM4676. Refer to Figure 2 for the proper measurement equipment setup and follow the procedure below.

1. With power off, connect the input power supply to VIN (4.5V to 26.5V) and GND (input return).

2. Connect the 1.0V output load between VOUT0 and GND (Initial load: no load).

3. Connect the 1.8V output load between VOUT1 and GND (Initial load: no load).

4. Connect the DVMs to the input and outputs. Set default jumper position: JP1: ON; JP2: ON.

5. Turn on the input power supply and check for the proper output voltages. VOUT0 should be 1.0V ±1 %, and VOUT1 should be 1.8 ±1%.

6. Once the proper output voltages are established, adjust the loads within the operating range and observe the output voltage regulation, ripple voltage and other parameters.

7. Connect the dongle and control the output voltages from the GUI. See “LTpowerPlay GUI for the LTM4676 Quick Start Guide” for details.

Note: When measuring the output or input voltage rip-ple, do not use the long ground lead on the oscilloscope probe. See Figure 3 for the proper scope probe technique. Short, stiff leads need to be soldered to the (+) and (–) terminals of an output capacitor. The probe’s ground ring needs to touch the (–) lead and the probe tip needs to touch the (+) lead.

Connecting a PC to DC1811B-A

You can use a PC to reconfigure the power management features of the LTM4676 such as: nominal VOUT, margin set points, OV/UV limits, temperature fault limits, sequenc-ing parameters, the fault log, fault responses, GPIOs and other functionality. The DC1613A dongle may be plugged when VIN is present.

Table 1. LTM4676 Demo Cards for Up to 130A Point-of-Load Regulation

MAXIMUM OUTPUT CURRENT NUMBER OF OUTPUT VOLTAGESNUMBER OF LTM4676 µMODULE

REGULATORS ON THE BOARD DEMO BOARD NUMBER

13A, 13A 2 1x LTM4676 DC1811A/DC1811B-A

13A, 13A 2 1x LTM4676A DC1811B-B

26A 1 1x LTM4676 DC2087A

50A 1 2x LTM4676 DC1989A-A

75A 1 3x LTM4676 DC1989A-B

100A 1 4x LTM4676 DC1989A-C

100A 1 1x LTM4676 (+ 3x LTM4620A) DC2106A-A

130A 1 1x LTM4676 (+ 3x LTM4630) DC2106A-B

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-

VIN 4.5V-‐26.5V A

V

+ -

+

+ -

A + -

Load0 (0~13A)

V + -

Vout0

A + -

Load1 (0~13A)

V + -

Vout1

Figure 2. Proper Measurement Equipment Setup

+ –

VOUT GND

COUT

Figure 3. Measuring Output Voltage Ripple

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USB to I2C/PMBus Dongle DC1613A

LTM4676 Demo Board DC1811B-‐A

Input Power Supply

USB Cable VIN

12-‐PIN (J1)

Connector

Load0 Vout0

Vout1 Load1

Figure 4. Demo Setup with PC

LOAD CURRENT (A)0

65

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70

80

85

90

6 7 8 109 11 12

100

DC1811A F05

75

1 2 3 4 5 13

95

VOUT = 1VVOUT = 1.2VVOUT = 1.5VVOUT = 1.8VVOUT = 2.5VVOUT = 3.3V

VIN = 5V, fSW = 500kHz, CCM

Figure 5. Efficiency vs Load Current at VIN = 5V Figure 6. Efficiency vs Load Current at VIN = 12V

LOAD CURRENT (A)0

65

60

EFFI

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70

80

85

90

6 7 8 109 11 12

DC1811A F06

75

1 2 3 4 5 13

95

VOUT = 1VVOUT = 1.2VVOUT = 1.5VVOUT = 1.8VVOUT = 2.5VVOUT = 3.3VVOUT = 5V

VIN = 12VfSW = 500kHzCCM

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VOUT0(20MHz BW)

50mV/DIV

9.75A TO 13ALOAD STEP

Figure 7. Output Voltage VOUT0 vs Load Current (VOUT0 RANGE = 0)

Figure 8. Output Voltage VOUT1 vs Load Current (VOUT1 Range = 1)

VOUT1(20MHz BW)

50mV/DIV

9.75A TO 13ALOAD STEP

VOUT0(20MHz BW)

10mV/DIV

Figure 9. Output Voltage Ripple at VIN = 12V, VOUT0 = 1V, IOUT0 = 13A

Figure 10. Output Voltage Ripple at VIN = 12V, VOUT1 = 1.8V, IOUT1 = 13A

VOUT1(20MHz BW)

10mV/DIV

Figure 11. Thermal performance at VIN = 12V, VOUT0 = 1.0V, IOUT0 = 13A, VOUT1 = 1.8V, IOUT1 = 13A, TA = 24°C, 200LFM Airflow

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Ltpowerplay softWare GuiLTpowerPlay is a powerful Windows-based development environment that supports Linear Technology power sys-tem management ICs, including the LTM4676, LTC3880, LTC3883, LTC2974 and LTC2978. The software supports a variety of different tasks. You can use LTpowerPlay to evaluate Linear Technology ICs by connecting to a demo board system. LTpowerPlay can also be used in an offline mode (with no hardware present) in order to build a mul-tichip configuration file that can be saved and reloaded at a later time. LTpowerPlay provides unprecedented diagnostic and debug features. It becomes a valuable diagnostic tool during board bring-up to program or tweak the power management scheme in a system, or to diagnose power

issues when bringing up rails. LTpowerPlay utilizes the DC1613A USB-to-SMBus controller to communicate with one of many potential targets, including the LTM4676, the LTC3880 and the LTC3883’s demo system, or a customer board. The software also provides an automatic update feature to keep the soft-ware current with the latest set of device drivers and documentation. The LTpowerPlay software can be downloaded from:


To access technical support documents for LTC Digital Power Products visit Help. View online help on the LTpowerPlay menu.

Figure 12. LTpowerPlay Main Interface

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Ltpowerplay Quick start GuiDeThe following procedure describes how to use LTpowerPlay to monitor and change the settings of LTM4676.

1. Download and install the LTPowerPlay GUI:


2. Launch the LTpowerPlay GUI.

a. The GUI should automatically identify the DC1811B-A. The system tree on the left hand side should look like this:

b. A green message box shows for a few seconds in the lower left hand corner, confirming that LTM4676 is communicating:

c. In the Toolbar, click the “R” (RAM to PC) icon to read the RAM from the LTM4676. This reads the configuration from the RAM of LTM4676 and loads it into the GUI.

Then, click the “W” (PC to RAM) icon to write these register values to the LTM4676. After finishing this step, you will see the output voltage will change to 1.5V.

If the write is successful, you will see the following message:

e. You can save the changes into the NVM. In the tool bar, click “RAM to NVM” button, as following

f. Save the demo board configuration to a (*.proj) file. Click the Save icon and save the file. Name it whatever you want.

d. If you want to change the output voltage to a different value, like 1.5V. In the Config tab, type in 1.5 in the VOUT_COMMAND box, like this:

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parts ListITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components1 1 CIN1 CAP., 150µF, 35V, ALUMINUM ELECTR., SUN ELECT., 35CE150AX

2 4 CIN2, CIN3, CIN4, CIN5 CAP., X5R, 10µF, 35V, 10%,1210 MURATA, GRM32ER6YA106KA12

3 6 COUT1-COUT3, COUT6-COUT8 CAP., X5R, 100µF, 6.3V, 20%, 1210 AVX, 12106D107MAT2A

4 2 COUT4, COUT5 CAP., 330µF, 6.3V, POSCAP, D3L PANASONIC, 6TPF330M9L

5 2 C1, C14 CAP., X7R, 2200pF, 25V, 10%, 0603 AVX, 06033C222KAT2A

6 1 C26 CAP., X5R, 100nF, 16V, 10%,0603 AVX, 0603YD104KAT2A

7 2 C27, C28 CAP., X5R, 10nF, 16V, 10%,0603 AVX, 0603YD103KAT2A

8 1 C23 CAP., X7R, 1µF, 25V,10%, 0805 AVX, 08053C105KAT2A

9 3 C21, C22, C24 CAP., X5R, 1µF, 25V,10%, 0603 AVX, 06033D105KAT2A

10 2 JP1, JP2 HEADER 3 PIN 0.079 SINGLE ROW SULLIN, NRPN031PAEN-RC

11 3 J2-J4 CONN, BNC, 5PINS CONNEX, 112404

12 1 J1 CONN HEADER 12POS 2Mm STR DL PCB FCI, 98414-G06-12ULF

13 6 J5-J10 BANANA JACK KEYSTONE, 575-4

14 1 Q1 N-Channel 30-V Mosfet VISHAY, SUD50N04-8M8P-4GE3

15 1 D8 DIODE, ULTRA LOW SCHOTTKY RECTIFIER NXP SEMI., PMEG2005AEL

16 1 Q19 P-Channel 30-V Mosfet DIODES INC., DMP3130L-7

17 1 J11 CONN RECEPT 2mm DUAL R/A 14POS (F) SULLINS, NPPN072FJFN-RC

18 1 J12 HEADER 14POS 2mm R/A GOLD (M) MOLEX, 87760-1416

19 1 J13 HEADER, 4 PINS, SHROUDED HIROSE, DF3A-4P-2DSA

20 10 R3, R5, R7, R9, R25, R31, R32, R63, R65, R66 RES., CHIP, 0Ω, 1%, 0603 NIC, NRC06ZOTRF

21 2 R69, R70 RES., CHIP, 10, 1%, 0603 NIC, NRC06F10R0TRF

22 12 R10-R16, R18, R19, R24, R52, R77 RES., CHIP, 10K, 1%, 0603 NIC, NRC06F1002TRF

23 1 R78 RES., CHIP, 15.8K, 1%, 0603 NIC, NRC06F1582TRF

24 1 R30 RES., CHIP, 6.34K, 1%, 0603 VISHAY, CRCW06036K34FKEA

25 3 R2, R72, R73 RES., CHIP, 4.99K, 1%, 0603 NIC, NRC06F4991TRF

26 1 R22 RES., CHIP, 4.22K, 1%, 0603 VISHAY, CRCW06034K22FKEA

27 1 R48 RES., CHIP, 0Ω, 0.5W, 2010 NIC, NRC50ZOTRF

28 1 R53 RES., CHIP, 0.01Ω, 1/2W, 1%, 2010 VISHAY, WSL2010R0100FEA

29 1 U3 IC, 24LC025-I/ST, SOIC MICROCHIP, 24LC025-I/ST

30 1 U1 IC, LTM4676EY#PBF LINEAR TECH., LTM4676EY#PBF

Additional Demo Board Circuit Components1 0 C2, C15-C17(OPT) CAP., 0603

2 0 D1, D2 (OPT) DIODE, SOD-323

3 0 R4, R6, R8, R20, R23, R26-R29, R33, R35, R37, R38, R41, R49, R61, R62, R64, R67, R68, R74, R75, R82, R83, R88, R89 (OPT)

RES., OPTIONAL

4 0 R50, R51(OPT) RES., CHIP, 30, 1%, 2512

Hardware-For Demo Board Only1 24 E1-E17, E20-E24, E28, E29 TESTPOINT, TURRET, 0.062" MILL-MAX, 2308-2-00-80-00-00-07-0

2 2 XJP1, XJP2 SHUNT SAMTEC, 2SN-BK-G

3 4 (STAND-OFF) STAND-OFF, NYLON 0.50" tall (SNAP ON) KEYSTONE, 8833

4 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 1811B-A

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10uF

R9

0R

90

E9SY

NC

E9SY

NC

R10

10K

R10

10K

R7

0R

70

E17

GN

D0_

SNS

E17

GN

D0_

SNS

R4

OPTR4

OPT

R33

OPT

R33

OPT

CO

UT7

100u

FC

OU

T710

0uF

R8

OPT

R8

OPT

C2

OPTC2

OPT

J10

VIN

J10

VIN

CIN

510

uFC

IN5

10uF

J5

GN

D

J5

GN

D

E16

VDD

25E1

6VD

D25

R14

10K

R14

10K

R32

0R

320

CO

UT8

100u

FC

OU

T810

0uF

C14

2200

pFC

1422

00pF

C1

2200

pFC

122

00pF

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OU

T533

0uF

+C

OU

T533

0uF

P1P1

R24

10K

R24

10K

U1

LTM

4676

EY

/ LT

M46

76A

EY

U1

LTM

4676

EY

/ LT

M46

76A

EY

VO

UT0

A1

VO

UT0

A2

VO

UT0

A3

VO

UT0

D1

ISN

S0b

-E

1

ISN

S0b

+F1

ISNS1b-G1

ISNS1b+H1

VOUT1J1

VOUT1J2

VOUT1J3

VOUT1K1

VO

UT0

B1

VO

UT0

B2

VO

UT0

B3

VO

UT0

D2

ISN

S0a

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2

ISN

S0a

+F2

ISNS1a-G2

ISNS1a+H2

VOUT1K2

VOUT1K3

VOUT1L1

VOUT1L2

VO

UT0

C1

VO

UT0

C2

VO

UT0

C3

VO

UT0

D3

GNDA4

GNDA6

GNDA7

GNDA8

VOUT1L3

VOUT1M1

VOUT1M2

VOUT1M3

GNDA9

GNDA10

GNDB4

GNDB5

AS

EL

G4

FSW

PH

CFG

H4

GNDB6

GNDB7

GNDB8

GNDB9

GP

IO0

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GP

IO1

F4

SN

UB

0A

5

GNDC4

TSN

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C5

TSN

S0a

D5

ALE

RT

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RU

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F5

VO

UT0

CFG

G5

VTR

IM0C

FGH

5TSNS1a

J5TSNS1b

K5

GNDC6

SNUB1M5

GNDC7

GNDC8

GNDC9

SD

AD

6S

CL

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RU

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F6

VO

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CFG

G6

VTR

IM1C

FGH

6

VD

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WP

K6

GNDD4

GNDE3

GNDF3

GNDF10

GNDG3

GNDG10

SY

NC

E7

GNDM9

GNDM10

SH

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E_C

LKH

7

VD

D33

J7

GNDG11

GNDG12

GNDL8GNDL7

GNDL9

GNDH3

CO

MP

0bD

8C

OM

P0a

E8

SGNDF7

SGNDF8

COMP1aH8

COMP1bJ8

GNDH10

GNDJ4

GNDM8

VO

SN

S0+

D9

VO

SN

S0-

E9

INTV

CC

F9

INTV

CC

G9

VOSNS1H9

VORB1J9

GNDJ10

GNDL4

GNDL5

GNDK4

SW

0B

10

DNCE11

VO

RB

0+D

10

VO

RB

0-E

10

GNDL6

GNDK7

GNDK8

GNDK9

DNCC10

SW1L10

GNDM4

VIN

H0

B12

VIN

H0

B11

VIN

H0

A12

VIN

H0

A11

DNCK10

VIN

LF1

2

GNDM6

DNCH11

VINH1H12

VINH1J11

VINH1J12

VINH1K11

VIN

H0

E12

VIN

H0

D12

VIN

H0

D11

VIN

H0

C12

VIN

H0

C11

VIN

LF1

1

GNDM7

VINH1K12

VINH1L11

VINH1L12

VINH1M11

VINH1M12

SGNDG7

SGNDG8

GNDD7

R30

6.34

KR

306.

34K

E7G

ND

1_SN

SE7

GN

D1_

SNS

R29

(OPT

)R

29(O

PT)

R16

10K

R16

10K

E8VD

D33

E8VD

D33

CO

UT6

100u

FC

OU

T610

0uF

E12

SDA

E12

SDA

C15

OPT

C15

OPT

R20

0805

R20

0805

P2P2

J8

GN

D

J8

GN

D

R25 0R25 0

P4P4

C17

OPT

C17

OPT

R11

10K

R11

10K

+C

OU

T433

0uF

+C

OU

T433

0uF

R19

10K

R19

10K

P5P5

R23

OPT

R23

OPT

R3

0R3

0

E14

GPI

O1B

E14

GPI

O1B

CO

UT3

100u

FC

OU

T310

0uF

E15

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T0_S

NS

E15

VOU

T0_S

NS

CO

UT2

100u

FC

OU

T210

0uF

J9

GN

D

J9

GN

D

R6

OPT

R6

OPT

R27

(OPT

)R

27(O

PT)

E3

INTV

CC

E3

INTV

CC

+C

IN1

150u

F+

CIN

115

0uF

R15

10K

R15

10K

R5

0R5

0

R2

4.99

KR

24.

99K

E1VO

UT1

_SN

SE1

VOU

T1_S

NS

E10

ALER

TBE1

0AL

ERTB

JP1

RU

N0

JP1

RU

N0

13 2

R13

10K

R13

10K

E11

SCL

E11

SCL

R22

4.22

KR

224.

22K

R12

10K

R12

10K

E6SH

ARE_

CLK

E6SH

ARE_

CLK

P3P3

CIN

410

uFC

IN4

10uF

JP2

OFF

RU

N1

JP2

OFF

RU

N1

13 2

R28

(OPT

)R

28(O

PT)

E2G

ND

E2G

ND

C16

OPT

C16

OPT

J6VO

UT1

J6VO

UT1

R31

0R

310

R26

(OPT

)R

26(O

PT)

E5G

ND

E5G

ND

10dc1811baf


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 representa-tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.


4 4

3 3

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R52

10K

R38

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PT

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GN

DE

22G

ND

J3J31

2345

R50

R50

Q1

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D50

N04

Q1

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D50

N04

2

1

34

R49

2010

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T

R49

2010

OP

T

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IOS

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J4

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E23

SG

ND

R48

2010

0.5W 0R48

2010

0.5W 0

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OP

TR

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J2

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VO

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C24

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C22

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C22

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R41

OP

T.

R41

OP

T.

E20

IOS

TEP

_CLK

E20

IOS

TEP

_CLK

R51

R51

E24

SG

ND

E24

SG

ND

C21

1uF

C21

1uF

R53 0.01

R53 0.01

C23

1uF

C23

1uF

11dc1811baf



4 4

3 3

2 2

1 1

DD

CC

BB

AA

J1, MALE, CONN HEADER 14POS 2MM R/A GOLD, Molex Connector Corp. 87760-1416

J2, FEMALE, CONN RECEPT 2MM DUAL R/A 14POS, Sullins Conn. NPPN072FJFN-RC

TO D

C16

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SIG

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OPTIONAL CIRCUIT FOR PROGRAMMING

WITHOUT VIN

1206

TO D

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12dc1811baf


Linear Technology Corporation1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2014

LT 1114 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions:

This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.

If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.).

No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.

Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged.

This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC applica-tion engineer.

Mailing Address:

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Copyright © 2004, Linear Technology Corporation

Documents

DC1811B-A – LTM4676 Dual Step-Down µModule Regulator with