Linear Technology DC2087A Quick setup guide

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DC2087A

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dc2087af

DEMO MANUAL DC2087A

DESCRIPTION

LTM4676EY

26A Step-Down µModule Regulator with

PMBus Power System Management

Demonstration circuit 2087A is a single-output, high ef-

ficiency,highdensity, µModule

regulator with 4.5V to 16V

input range. It can supply 26A maximum load current. The

demo board has a LT M

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.

DC2087Apowersuptodefaultsettings 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 LT C ’s

I2C/SMBus/PMBus dongle DC1613A to connect to the

L, LT, LTC, LTM, Linear Technology, the Linear logo and µModule are registered trademarks

and LTpowerPlay is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

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 LTM4676 Quick Start Guide.

Design files for this circuit board are available at

http://www.linear.com/demo

BOARD PHOTO

Figure 1. Single-Output LTM4676/DC2087A Demo Circuit

dc2087af

DEMO MANUAL DC2087A

QUICK START PROCEDURE

PERFORMANCE SUMMARY

Specifications are at TA= 25°C

PARAMETER CONDITION VALUE

Input Voltage Range 4.5V to 16V

Output Voltage, VOUT VIN = 4.5 to 16V, IOUT = 0A to 26A 0.5V to 4V, Default: 1V

Maximum Output Current, IOUT VIN = 4.5 to 16V, VOUT = 0.5V to 4V 26A

Typical Efficiency VIN = 12V, VOUT = 1.2V, IOUT = 26A 83.2%

Default Switching Frequency 350kHz

Table 1. LTM4676 Demo Cards for Up to 100A Point-of-Load Regulation

MAXIMUM OUTPUT CURRENT NUMBER OF OUPUT VOLTAGES

NUMBER OF LTM4676 µMODULE

REGULATORS ON THE BOARD DEMO BOARD NUMBER

13A, 13A 2 1 DC1811A

26A 1 1 DC2087A

50A 1 2 DC1989A-A

75A 1 3 DC1989A-B

100A 1 4 DC1989A-C

100A 1 1(+3 ×LTM4620A) DC2106A-A

130A 1 1(+3 ×LTM4630) DC2106A-B

Demonstration circuit 2087A is easy to set up to evaluate

the performance of the LTM4676EY. 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–16V) and GND (input return).

2. Connect the 1.0V output load between VOUT and GND

(Initial load: no load).

3. Connect the DVMs to the input and outputs. Set default

jumper position: JP1: ON.

4. Turn on the input power supply and check for the proper

output voltages. VOUT should be 1.0V ±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 LTM4676

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 DC2087A

You can use a PC to reconfigure the power management

features of the LTM4676 such as: nominal VOUT, margin

setpoints, OV/UV limits, temperature faultlimits, sequenc-

ing parameters, the fault log, fault responses, GPIOs and

other functionality. The DC1613A dongle may be plugged

when VIN is present.

dc2087af

DEMO MANUAL DC2087A

QUICK START PROCEDURE

Figure 2. Proper Measurement Equipment Setup

Figure 3. Proper Measurement Equipment Setup

dc2087af

DEMO MANUAL DC2087A

QUICK START PROCEDURE

Figure 4. Demo setup with PC

LOAD CURRENT (A)

EFFICIENCY (%)

100

75 2468 10 12 14 20 2218 24 26

VOUT = 0.9V, 350kHz

VOUT = 1.0V, 350kHz

VOUT = 1.2V, 350kHz

VOUT = 1.5V, 350kHz

VOUT = 1.8V, 425kHz

VOUT = 2.5V, 500kHz

VOUT = 3.3V, 500kHz

LOAD CURRENT (A)

EFFICIENCY (%)

70 2468 10 12 14 20 2218 24 26

VOUT = 0.9V, 350kHz

VOUT = 1.0V, 350kHz

VOUT = 1.2V, 350kHz

VOUT = 1.5V, 350kHz

VOUT = 1.8V, 425kHz

VOUT = 2.5V, 500kHz

VOUT = 3.3V, 500kHz

VOUT

(20MHz BW)

20mV/DIV

13A TO 26A

LOAD STEP

VIN = 12V

VOUT = 1V

fSW = 350kHz

VOUT RANGE = 0

VOUT

(20MHz BW)

10mV/DIV

VIN = 12V

VOUT = 1V VIN = 12V

VOUT = 1V

IOUT = 26A

fSW = 350kHz

TA= 23°C

NO AIRFLOW

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

Figure 7. Output Voltage VOUT

vs Load Current

Figure 8. Output Voltage Ripple

Figure 9. Thermal Performance

dc2087af

DEMO MANUAL DC2087A

LTpowerPlay SOFTWARE GUI

LTpowerPlay is a powerful Windows-based development

environment that supports Linear Technology power sys-

tem management ICs, including the LTM4676, LT C

3880,

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

latertime. 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 software current with the latest set

of device drivers and documentation. The LTpowerPlay

soft-ware can be downloaded from:

http://www.linear.com/ltpowerplay

To access technical support documents for LT C Digital

Power Products visit Help. View online help on the

LTpowerPlay menu.

Figure 10. LTpowerPlay Main Interface

dc2087af

DEMO MANUAL DC2087A

LTpowerPlay QUICK START PROCEDURE

Thefollowingprocedure describes how to use LTpowerPlay

to monitor and change the settings of LTM4676.

1. Download and install the LTPowerPlay GUI:

http://www.linear.com/ltpowerplay

2. Launch the LTpowerPlay GUI.

a. TheGUI should automatically identify the DC2087A. 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.

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:

Ifthe write is successful, youwillseethefollowingmessage:

e. You can save the changes into the NVM. In the tool bar,

click “RAM to NVM” button, as following

f. Savethedemo board configuration to a (*.proj) file. Click

the Save icon and save the file. Name it whatever you

want.

dc2087af

DEMO MANUAL DC2087A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

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

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

3 6 COUT1-COUT3, COUT6-COUT8 CAP., X5R, 100µF, 6.3V, 20% 1210 MURATA, GRM32ER60J107ME20L

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

5 1 C14 CAP., X7R, 2200pF, 25V, 10%, 0603 MURATA, GRM188R71E222KA01D

6 1 C15 CAP., X7R, 68pF, 25V, 10%, 0603 AVX., 06033A680KAT2A

7 1 C20 CAP., X5R, 0.1µF, 16V, 10%,0603 MURATA, GRM188R61C104KA01D

8 1 C21 CAP., X5R, 1µF, 25V,10%, 0603 MURATA, GRM188R61E105KA12D

9 1 JP1 HEADER 3 PIN 0.079 SINGLE ROW SAMTEC, TMM103-02-L-S

10 2 J2, J4 CONN, BNC, 5PINS CONNEX, 112404

11 1 J1 CONN HEADER 12POS 2MM STR DL PCB FCI 98414-G06-12ULF

12 2 J9, J10 BANANA SMALL KEYSTONE, 575-4

13 2 J7, J8 STUD, TEST PIN PEM KFH-032-10

14 4 J7, J8 X2 NUT, BRASS 10-32 ANY, #10-32M/S BR PL

15 2 J7, J8 RING, LUG #10 KEYSTONE, 8205

16 2 J7, J8 WASHER, TIN PLATED BRASS ANY, #10 EXT BZ TN

17 1 Q1 MOSFET, N-CH 40V 50A TO-252 VISHAY, SUD50N04-8M8P-4GE3

18 8 R3, R5, R7, R9, R19, R25, R32, R40 RES., CHIP, 0Ω, 1%, 0603 NIC, NRC06ZOTR

19 11 R10-R15, R18, R24, R46, R47, R52 RES., CHIP, 10k, 1%, 0603 NIC, NRC06F1002TRF

20 1 R27 RES., CHIP, 22.6k, 1%, 0603 VISHAY, CRCW060322K6FKEA

21 2 R44, R45 RES., CHIP, 4.99k, 1%, 0603 NIC, NRC06F4991TRF

22 1 R22 RES., CHIP, 4.75k, 1%, 0603 VISHAY, CRCW06034K75FKEA

23 3 R17, R35, R38 RES., CHIP, 0Ω, 0.5W, 1210 VISHAY, CRCW12100000Z0EF

24 1 R53 RES., CHIP, 0.01, 1/2W, 1%, 2010 VISHAY, WSL2010R0100FEA

25 1 U1 IC, LTM4676EY#PBF LINEAR TECH. LTM4676EY#PBF

26 1 U2 IC, EEPROM 2KBIT 400KHZ SOT23-6 MICROCHIP, 24LC025T-E/OT

Additional Demo Board Circuit Components

1 0 C16, C17, COUT9, COUT10 (OPT) CAP., OPTIONAL OPT

2 0 R4, R6, R8, R20, R23, R33, R34 (OPT) RES., 0603 OPT

3 0 R36, R37, R39, R16, R26, R28-R31 (OPT) RES., CHIP OPTIONAL OPT

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

Hardware-For Demo Board Only

1 21 E2-E6, E8-E20, E22-E24 TESTPOINT, TURRET, 0.062" MILL-MAX, 2308-2-00-80-00-00-07-0

2 1 XJP1 SHUNT SAMTEC, 2SN-BK-G

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

4 1 FAB, PRINTED CIRCUIT BOARD DEMO CIRCUIT 2087A

dc2087af

DEMO MANUAL DC2087A

SCHEMATIC DIAGRAM

dc2087af

DEMO MANUAL DC2087A

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.

SCHEMATIC DIAGRAM

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