dc1989b-b - ltm4676aey dual 13a or single 26a µmodule ... · demo manual dc schematic diagram 5 5...

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DEMO MANUAL DC1989B-B

DESCRIPTION

LTM4676AEYDual 13A or Single 26A µModule Regulator

with Digital Power System Management 3× LTM4676A, 75A

Demonstration circuit 1989B-B is a high efficiency, high density, µModule regulator with 4.5V to 17V input range. The output voltage is adjustable from 0.5V to 4V, and it can supply 75A maximum load current. The demo board has three LTM®4676A µModule regulators, and the LTM4676A is a dual 13A or single 26A step-down regulator with PMBus power system management. Please see LTM4676A data sheet for more detailed information

DC1989B-B powers up to default settings and produces power based on configuration resistors without the need for any serial bus communication. This allows easy evalu-ation 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

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

the board. 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 LTM4676A Quick Start Guide.

Design files for this circuit board are available at http://www.linear.com/demo/DC1989B-B

Figure 1. 3× LTM4676A; 75A DC1989B-B Demo Circuit

http://www.linear.com/LTM4676A


http://www.linear.com/demo/DC1989B-B

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QUICK START PROCEDUREDemonstration circuit 1989B-B is easy to set up to evaluate the performance of the LTM4676AEY. 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 17V) and GND (input return).

2. Connect the 1V output load between VOUT0 and GND (Initial load: no load).

3. Connect the DVMs to the input and outputs. Set default switch position: SW1: ON; SW2: ON.

4. Turn on the input power supply and check for the proper output voltages. VOUT0 should be 1V ±1%.

5. Once the proper output voltages are established, ad-just the loads within the operating range and observe the output voltage regulation, ripple voltage and other parameters.

6. Connect the dongle and control the output voltages from the GUI. See “LTpowerPlay GUI for the LTM4676A Quick Start Guide” for details.

Note: When measuring the output or input voltage ripple, 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 DC1989B-B

You can use a PC to reconfigure the power management features of the LTM4676A 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.

PERFORMANCE SUMMARY Specifications are at TA = 25°C

PARAMETER CONDITION VALUE

Input Voltage Range 4.5V to 17V

Output Voltage, VOUT0 VIN = 4.5 to 17V, IOUT0 = 0A to 75A 0.5V to 4V, Default: 1V

Maximum Output Current, IOUT0 VIN = 4.5 to 17V, VOUT = 0.5V to 4V 75A

Typical Efficiency VIN = 12V, VOUT = 1V, IOUT = 75A 80%

Default Switching Frequency 350kHz

Table 1. LTM4676/LTM4676A Demo Cards for Up to 130A Point-of-Load Regulation

MAXIMUM OUTPUT CURRENT NUMBER OF OUTPUT VOLTAGESNUMBER OF LTM4676/LTM4676A µMODULE

REGULATORS ON THE BOARD DEMO BOARD NUMBER

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

13A, 13A 2 1× LTM4676A DC1811B-B

26A 1 1× LTM4676 DC2087A

50A 1 2× LTM4676A DC1989B-A

75A 1 3× LTM4676A DC1989B-B

100A 1 4× LTM4676A DC1989B-C

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

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

100A 1 1× LTM4676A (+ 3× LTM4620A) DC2106B-A

130A 1 1× LTM4676A (+ 3× LTM4630) DC2106B-B

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QUICK START PROCEDURE

Figure 2. Proper Measurement Equipment Setup

Figure 3. Measuring Output Voltage Ripple

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Figure 4. Demo Setup with PC

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

Efficiency vs Load Current100

90

70

80

60

50

LOAD CURRENT (A)

EFFI

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CY (%

)

0 755 15 45 55 653525

VIN = 5VVIN = 12V

VOUT0 = 1V

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Figure 8. Thermal Performance at VIN = 12V, VOUT0 = 1V, IOUT0 = 75A, TA = 23.8°C, Air Flow 200LFM

VOUT0 (20MHz BW) [50mV/DIV]

37.5A TO 75A LOAD STEP

VOUT0 (20MHz BW) [10mV/DIV]

Figure 6. Output Voltage VOUT0 vs Load Current (VOUT0 RANGE = 1)

Figure 9. Current Sharing at VIN = 12V, VOUT0 = 1V (Based on the Current Readback)

Figure 7. Output Voltage Ripple at VIN = 12V, VOUT0 = 1V, IOUT0 = 75A

Figure 10. Total Current Readback vs Load Current at VIN = 12V, VOUT0 = 1V

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LTpowerPlay Software GUI

LTpowerPlay is a powerful Windows based development environment that supports Linear Technology power sys-tem management ICs, including the LTM4676A, 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 LTM4676A, the

LTC3880 and the LTC3883’s demo system, or a customer board. The software also provides an automatic update feature to keep the software current with the latest set of device drivers and documentation. The LTpowerPlay software can be downloaded from:

http://linear.com/ltpowerplay

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

LTpowerPlay QUICK START PROCEDURE

The following procedure describes how to use LTpowerPlay to monitor and change the settings of LTM4676A.

1. Download and install the LTPowerPlay GUI:

http://linear.com/ltpowerplay

Figure 11. LTpowerPlay Main Interface



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QUICK START PROCEDURE2. Launch the LTpowerPlay GUI.

a. The GUI should automatically identify the DC1989B-B. 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 LTM4676A is communicating:

c. In the Toolbar, click the “R” (RAM to PC) icon to read the RAM from the LTM4676A. This reads the configuration from the RAM of LTM4676A and loads it into the GUI.

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:

Then, click the “W” (PC to RAM) icon to write these register values to the LTM4676A. 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.

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PARTS LISTITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 14 CIN1, CIN2, CIN4-CIN11, CIN12-CIN15 CAP., X5R, 10µF, 35V, 10%, 1210 AVX, 1210DD106KAT2A

2 1 CIN3 CAP., 150µF, 35V, ALUMINUM ELECTR. SUN ELECTRONIC INDUSTRIES CORPORATION, 35CE150AX

3 10 COUT1, COUT6, COUT7, COUT9, COUT12, COUT17, COUT18, COUT20, COUT27, COUT23

CAP., X5R, 100µF, 6.3V, 20% 1210 AVX, 12106D107KAT2A

4 1 C3 CAP., X7R, 220pF, 16V, 10%, 0603 AVX, 0603YC221KAT2A

5 8 COUT4, COUT5, COUT8, COUT15, COUT16, COUT19, COUT28, COUT26

CAP., 330µF, 6.3V, POSCAP, D3L PANASONIC, 6TPF330M9L

6 1 C7 CAP., X7R, 470pF, 25V, 10%, 0603 AVX, 06033C471KAT2A

7 1 C4 CAP., X7R, 4.7nF, 16V, 10%, 0603 AVX, 0603YC472KAT2A

8 1 C32 CAP., X5R, 100nF, 16V, 10%, 0603 AVX, 0603YD104KAT2A

9 1 C70 CAP., X5R, 1µF, 25V, 10%, 0805 AVX, 08053D105KAT2A

10 2 C65, C68 CAP., X5R, 1µF, 25V, 10%, 1206 AVX, 12063D105KAT2A

11 1 C67 CAP., X7R, 0.1µF, 25V, 10%, 1206 AVX, 12063C104KAT2A

12 1 C64 CAP., X5R, 4.7µF, 25V, 10%, 0603 MURATA, GRM188R61E475KE11D

13 1 C66 CAP., X5R, 0.22µF, 25V, 10%, 0805 AVX, 08053D224KAT2A

14 2 D1, D2 LED, 0603 GREEN WURTH ELEKTRONIK 150060GS75000

15 1 D3 LED, 0603 RED WURTH ELEKTRONIK 150060SS75000

16 1 D8 DIODE SCHOTTKY 20V 500MA SOD882 NXP SEMI. PMEG2005AEL

17 1 Q2 MOSFET P-CH 20V 5.9A TO-236 VISHAY SI2365EDS-T1-GE3

18 2 Q3, Q4 MOSFET N-CH 60V 115MA SOT-23 FAIRCHILD 2N7002K

19 2 Q11, Q12 XSTR, N-CH 40V 14A TO-252 VISHAY SUD50N04-8M8P-4GE3

27 1 Q19 P-CHANNEL 30-V MOSFET DIODES INC., DMP3130L-7

28 2 R65, R66 RES., CHIP, 2.43k, 1%, 0603 VISHAY CRCW06032K43FKEA

29 1 R20 RES., CHIP, 22.6k, 1%, 0603 VISHAY CRCW060322K6FKEA

30 23 R2, R4, R18, R25, R26, R30, R32, R47, R48, R50, R56, R58, R60, R72, R74, R104, R119, R120, R121, R122, R131, R135, R143

RES., CHIP, 0Ω, 1%, 0603 VISHAY CRCW06030000Z0EA

31 4 R49, R51, R53, R54 RES., CHIP, 0Ω, 1%, 2010 VISHAY CRCW20100000Z0EF

15 R6, R7, R8, R9, R10, R11, R12, R15, R35, R36, R39, R64, R78, R116, R130

RES., CHIP, 10k, 1%, 0603 VISHAY CRCW060310K0FKEA




35 2 R16, R41 RES., CHIP, 10Ω, 1%, 0603 VISHAY CRCW060310R0FKEA

36 1 R112 RES., CHIP, 100Ω, 1%, 0603 VISHAY CRCW0603100RFKEA


38 1 R19 RES., CHIP, 787Ω, 1%, 0603 PANASONIC ERJ-3EKF7870V

39 1 R27 RES., CHIP, 51k, 1%, 0603 VISHAY CRCW060351K0FKEA


41 2 R134, R144 RES., CHIP, 4.99k, 1%, 0603 VISHAY CRCW06034K99FKEA

42 2 R85, R124 RES., CHIP, 200Ω, 1%, 0603 VISHAY CRCW0603200RFKEA

43 1 R86 RES., CHIP, 127Ω, 1%, 0603 VISHAY CRCW0603127RFKEA

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PARTS LISTITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

44 1 R123 RES., CHIP, 1M, 1%, 0603 VISHAY CRCW06031M00FKEA

45 1 R105 RES., CHIP, 681k, 1%, 0603 VISHAY CRCW0603681KFKEA

46 1 R106 RES., CHIP, 3.3Ω, 1%, 0603 VISHAY CRCW06033R30FKEA

47 1 R107 RES., CHIP, 82.5Ω, 1%, 0603 VISHAY CRCW060382R5FKEA

48 2 R108, R118 RES., CHIP, 0.01Ω, 1%, 2010 VISHAY, WSL2010R0100FEA


50 1 R110 TRIMMING POTENTIOMETER, 5k BOURNS, 3386P-1-502LF

51 2 R111, R115 RES., CHIP, 20k, 1%, 0603 VISHAY CRCW060320K0FKEA


53 1 R117 RES., CHIP, 2Ω, 1%, 0603 VISHAY CRCW06032R00FKEA

54 3 U1, U2, U3 IC, LTM4676AEY LINEAR TECH., LTM4676AEY#PBF

55 1 U9 IC, 24LC025T-I/ST SOT-23 6-LEAD MICROCHIP, 24LC025T-I/ST

56 1 U6 IC., LT1129CS8-5, S8 LINEAR TECH. LT1129CS8-5#PBF

57 1 U7 IC., LTC6992-1, S6-TSOT LINEAR TECH. LTC6992CS6-1#PBF

58 1 U8 IC., LT1803IS5, S5-TSOT LINEAR TECH. LT1803IS5#PBF

Additional Demo Board Circuit Components

1 0 COUT2, COUT3, COUT10, COUT11, CIN16-CIN19, COUT21, COUT22, COUT29-COUT33, COUT35-COUT37, COUT34, COUT38, C1, C2, C6, C8-C20

CAP., OPTIONAL

2 0 C69 OPT

3 0 D4, D5 OPT SOD323

4 0 R3, R5, R17, R33, R34, R38, R59, R61, R63, R73, R75, R77, R126, R127, R128, R132, R133, R136, R137, R139, R140, R142, R1, R13, R29, R37, R57, R62, R71, R7, R21, R22, R23, R24, R43, R44, R45, R46, R67, R68, R69, R70, R79-R84, R102, R103, R138

RES., OPTIONAL

5 0 U4 OPTIONAL

Hardware: For Demo Board Only

1 23 E2-E24 TESTPOINT, TURRET, 0.062" MILL-MAX, 2308-2-00-80-00-00-07-0

2 2 JP1, JP2 HEADER, 1X3 PIN 0.079" SINGLE ROW SULLIN, NRPN031PAEN-RC

3 2 XJP1, XJP2 SHUNT, 0.079" CENTER SAMTEC, 2SN-KB-G

4 4 J1, J2, J3, J4 STUD, TESTPIN PEM KFH-032-10

5 8 J1, J2, J3, J4 (x2) NUT, BRASS 10-32 ANY #10-32

6 4 J1, J2, J3, J4 RING, LUG #10 KEYSTONE 8205

7 4 J1, J2, J3, J4 WASHER, TIN PLATED BRASS ANY #10EXT BZ TN

8 2 J5, J6 JACK, BANANA KEYSTONE 575-4

9 1 J7 CONN HEADER 12POS 2MM STR DL PCB FCI 98414-G06-12ULF

10 1 J12 CONN RECEPT 2MM DUAL R/A 14POS (F) SULLINS, NPPN072FJFN-RC

11 1 J13 HEADER 14POS 2MM R/A GOLD (M) MOLEX, 87760-1416

12 2 J10, J11 CONN, BNC, 5PINS CONNEX, 112404

13 1 J14 HEADER, 4 PINS, SHROUDED HIROSE, DF3A-4P-2DSA

14 2 SW1, SW2 CONNECTOR, SUB MINIATURE SLIDE SWITCHES

C&K., JS202011CQN

15 4 (STAND-OFF) STAND-OFF, NYLON 0.50" TALL, SNAP ON KEYSTONE, 8833

10dc1989bbf


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CUIT

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ROPR

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RY T

O LI

NEAR

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OGY

AND

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MAT

IC

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OGY

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ALE

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NE

www.

linea

r.com 1

Thur

sday

, Marc

h 17,

2016

16

HIGH

EFF

ICIE

NCY,

POL

Y-PH

ASE,

DC/

DC S

TEP-

DOW

N

HZ JIAN

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M46

76AE

YDE

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MAT

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NE

www.

linea

r.com 1

Thur

sday

, Marc

h 17,

2016

26

HIGH

EFF

ICIE

NCY,

POL

Y-PH

ASE,

DC/

DC S

TEP-

DOW

N

HZ JIAN

L.

BLT

M46

76AE

YDE

MO C

IRCU

IT 19

89B-

BSI

ZE

DATE

:

IC N

O.RE

V.

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TOF

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E:

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OVAL

S

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HN

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e: (4

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arth

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LTC

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iden

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Use

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y

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NOT

ICE

LINE

AR T

ECHN

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S MA

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MAT

IC

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LIED

FOR

USE

WIT

H LI

NEAR

TEC

HNOL

OGY

PART

S.SC

ALE

= NO

NE

www.

linea

r.com 1

Thur

sday

, Marc

h 17,

2016

26

HIGH

EFF

ICIE

NCY,

POL

Y-PH

ASE,

DC/

DC S

TEP-

DOW

N

HZ JIAN

L.

BLT

M46

76AE

YDE

MO C

IRCU

IT 19

89B-

BSI

ZE

DATE

:

IC N

O.RE

V.

SHEE

TOF

TITL

E:

APPR

OVAL

S

PCB

DES.

APP

ENG.

TEC

HN

OLO

GY

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(408

)434

-050

7

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itas,

CA 95

035

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e: (4

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arth

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HNOL

OGY

PART

S.SC

ALE

= NO

NE

www.

linea

r.com 1

Thur

sday

, Marc

h 17,

2016

26

HIGH

EFF

ICIE

NCY,

POL

Y-PH

ASE,

DC/

DC S

TEP-

DOW

N

HZ JIAN

L.

BLT

M46

76AE

YDE

MO C

IRCU

IT 19

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B

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ROPR

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RY T

O LI

NEAR

TEC

HNOL

OGY

AND

SCHE

MAT

IC

SUPP

LIED

FOR

USE

WIT

H LI

NEAR

TEC

HNOL

OGY

PART

S.SC

ALE

= NO

NE

www.

linea

r.com 1

Thur

sday

, Marc

h 17,

2016

36

HIGH

EFF

ICIE

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linea

r.com 1

Thur

sday

, Marc

h 17,

2016

36

HIGH

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POL

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ASE,

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TEP-

DOW

N

HZ JIAN

L.

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YDE

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linea

r.com 1

Thur

sday

, Marc

h 17,

2016

36

HIGH

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ICIE

NCY,

POL

Y-PH

ASE,

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DC S

TEP-

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HZ JIAN

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www.

linea

r.com 1

Thur

sday

, Marc

h 17,

2016

46

HIGH

EFF

ICIE

NCY,

POL

Y-PH

ASE,

DC/

DC S

TEP-

DOW

N

HZ JIAN

L.

BLT

M46

76AE

YDE

MO C

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www.

linea

r.com 1

Thur

sday

, Marc

h 17,

2016

46

HIGH

EFF

ICIE

NCY,

POL

Y-PH

ASE,

DC/

DC S

TEP-

DOW

N

HZ JIAN

L.

BLT

M46

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YDE

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www.

linea

r.com 1

Thur

sday

, Marc

h 17,

2016

46

HIGH

EFF

ICIE

NCY,

POL

Y-PH

ASE,

DC/

DC S

TEP-

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HZ JIAN

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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.

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16dc1989bbf


Linear Technology Corporation1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2016

LT 0916 • 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:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

Copyright © 2004, Linear Technology Corporation

http://www.linear.com

dc1989b-b - ltm4676aey dual 13a or single 26a µmodule ... · demo manual dc schematic diagram 5 5...

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