Linear Technology LTC3880EUJ Quick setup guide

dc2052af

DEMO MANUAL DC2052A

DESCRIPTION

LTC3880EUJ/LTC3883EUH

3-Phase Step-Down DC/DC

Controller with Power System

Management

Demonstration circuit 2052A is a 3-phase single output

synchronous buck converter featuring the LTC3880EUJ, a

dual-phasecurrentmodecontroller,andtheLTC3883EUH,

a single-phase current mode controller with input current

sensing capability. Both the LT C

3880 and LTC3883 have

a PMBus interface and the power system management

functions.

The layout of DC2052A is very compact with the total

solution within a 1.1 inch by 1.2 inch area for LTC3880,

and 1.1 inch by 0.35inch for LTC3883. The input volt-

age range of this board is from 6.5V to 14V. The output

voltage can be programmed from 0.5V to 1.8V, with an

output current of up to 60A total. The factory default set-

ting for the output voltage is 1.0V. The DC2052A also has

an onboard pulse generator circuit and the dynamic load

circuit which make it easy for the customer to evaluate

the transient performances.

The DC2052A powers up to default settings and produces

power based on configuration resistors or the non-volatile

memory settings (NVM) without the need for any serial

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.

PERFORMANCE SUMMARY

bus communication. This allows easy evaluation of the

DC/DC converter. To fully explore the extensive digital

power management features of these parts, download the

GUI software LTpowerPlay™ onto your PC and use LTC’s

I2C/SMBus/PMBus Dongle DC1613A to connect to 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 for LTC3880 Quick Start Guide.”

Design files for this circuit board are available at

http://www.linear.com/demo

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Supply Range 6.5 12 14 V

VOUT Output Voltage Range IOUT = 0A to 60A, VIN = 6.5V to 14V 0.5 1.0 1.8 V

IOUT Output Current Range 060A

FSW Factory Default Switching 350 kHz

EFF Peak Efficiency VOUT = 1.0V, See Figure 4 87.5 %

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DEMO MANUAL DC2052A

QUICK START PROCEDURE

Demonstration circuit 2052A makes it easy to set up and

evaluate the performance of the LTC3880andtheLTC3883.

Referto Figure 2 for proper measurement equipment setup

and follow the procedure below:

Note: When measuring the input or output voltage ripple,

care must be taken to avoid a long ground lead on the

oscilloscope probe. Measure the output voltage ripple by

touching the probe tip directly across the C16. See Figure3

for proper scope probe technique.

1. Make sure jumpers are in the following positions:

JUMPER POSITION FUNCTION

JP1 OFF EXTVCC_DRV – External VCC for

LTC3880/LTC3883-1

JP2 OFF LED Indicator

JP3 OFF Pulse Generator

2. With power off, connect the input power supply to VIN

and GND. Connect active load to the output.

3. Make sure the RUN switch (SW) is OFF.

4. Turn on the power at the input.

Note:Make sure that the input voltage doesnot exceed 16V.

5. Turn on the RUN switch as desired.

6. Check for the correct output voltage from E3 to E4.

VOUT = 1.0V ±0.5% (1.005V ~ 0.995V)

Note: If there is no output, temporarily disconnect the load

to make sure that the load is not set too high.

7. Once the proper output voltage is established, adjust

the loads within the operating range and observe the

output voltage regulation, ripple voltage, efficiency and

other parameters.

8. Connectthedongleand control the output voltages from

the GUI. See “LTpowerPlay QUICK START” session for

details.

Figure 1. Demo Setup with PC

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DEMO MANUAL DC2052A

QUICK START PROCEDURE

+–

VOUT GND

COUT

Figure 2. Power Test Setup

Figure 3. Measuring Output Voltage Ripple

dc2052af

DEMO MANUAL DC2052A

QUICK START PROCEDURE

Connecting a PC to DC2052A

You can use a PC to reconfigure the power management

features of the LTC3880 and the LTC3883 such as: nomi-

nal VOUT, margin set points, OV/UV limits, temperature

fault limits, sequencing parameters, the fault log, fault

responses, GPIO and other functionality. The DC1613A

dongle may be plugged in regardless of whether or not

VIN is present. Dongle can be hot plugged.

Combining DC2052A with Other Digital Power Demo

Boards

The DC2052A may be plugged together in a multiboard

array with other LTC power system management boards

using J6 and J8.

Measuring Efficiency (See Figure 4)

To accurately measure efficiency of any configuration, do

the following:

• Set JP1, JP2, JP3 to OFF position to disable all the

auxiliary circuits.

• Make sure R53, R54 are not stuffed.

• Measure VIN across the input ceramic capacitor (C28).

Measure VOUT across the output ceramic capacitor

(C32).

Evaluating the DC2052A When VIN is Below 6.0V

For applications that the input voltage is within 4.5V to

6.0V, please install R5 to connect VIN directly to INTVCC.

Please be aware that in this case VIN cannot exceed 6.0V

otherwise the chip will be damaged.

Evaluating the LTC3880-1 and LTC3883-1

For applications that requirethe highest possible efficiency,

the LTC3880-1 and LTC3883-1 allow the user to supply

the bias voltage and gate driver current from an external

power supply. Connect the external power supply, 4.8V

to 5.2V, to the EXTVCC pin.

To use the onboard LDO to drive INTVCC, make the fol-

lowing modifications to the demo board:

• Set JP1 to ON so that U4 provides the 5V drive to

INTVCC.U4takesthe place of the external power supply.

• Install R53, R54.

To accurately measure efficiency of a demo board contain-

ing the LTC3880-1 and the LTC3883-1,

• Drive INTVCC from an external source through the pin

named: EXTVCC.

• Set JP1 to OFF to disable the LDO.

• Measure VIN across the input ceramic capacitor (C28).

Measure VOUT across the output ceramic capacitor

(C32).

Measuring Output Ripple Voltage

An accurate ripple measurement may be performed by

using the below configuration across C16.

Figure 4. Typical Efficiency Curves DC2052A, 12VIN,

FSW = 350kHz, VOUT = 1.0V,1.2V,1.5V

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DEMO MANUAL DC2052A

LTpowerPlay SOFTWARE GUI

LTpowerPlay is a powerful Windows-based development

environment that supports Linear Technology power sys-

tem management ICs, including the 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 multichip

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 LTC3880 and

the LTC3883’s DC2052A 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.

Figure 5. LTpowerPlay Main Interface

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DEMO MANUAL DC2052A

LTpowerPlay QUICK START PROCEDURE

The following proceduredescribes how to useLTpowerPlay

to monitor and change the settings of LTC3880 and

LTC3883.

1. Download and install the LTPowerPlay GUI:

http://linear.com/ltpowerplay

2. Launch the LTpowerPlay GUI.

a. The GUI should automatically identify the DC2052A.

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 the LTC3880

and the LTC3883 are communicating:

c. In the Toolbar, click the “R” (RAM to PC) icon to read

the RAM from the LTC3880 and the LTC3883. This

reads the configuration from the RAM of LTC3883

and loads it into the GUI.

d. If you want to change the output voltage to a differ-

ent value, like 1.5V. In the Config tab, type in 1.5 in

the VOUT_COMMAND box, like this:

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DEMO MANUAL DC2052A

LTpowerPlay QUICK START PROCEDURE

Then, click the “W” (PC to RAM) icon to write these

finishing this step, you will see the output voltage

will change to 1.5V.

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.

If the write is successful, you will see the following

message:

dc2052af

DEMO MANUAL DC2052A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURE/PART NUMBER

Required Circuit Components

1 6 C1, C2, C27, C28, C44, C45 CAP., X5R, 22μF, 25V, 10%, 1210 MURATA GRM32ER61E226KE15L

2 2 C3, C40 CAP., X7R, 4.7μF,16V, 10%, 0603 TDK C1608X5R1C475K

3 2 C4, C5 CAP., OS-CON, 330μF, 16V, 20% SANYO, 16SVP330M

4 1 C6 CAP., X7R, 100nF, 25V, 10%, 0603 AVX 06033C104KAT2A

5 3 C21, C29, C47 CAP., X7R, 100nF, 25V, 10%, 0402 AVX 04023D104KAT2A

6 6 C7, C8, C14, C36, C41, C53 CAP., X5R, 1μF, 10V, 20%, 0402 AVX 0402ZD105KAT2A

7 2 C38, C39 CAP., X5R, 1μF, 10V, 20%, 0603 TAIYO YUDEN EMK107BJ105KA

8 18 C9, C10, C11, C12, C13, C30, C31, C32, C33,

C34, C35, C48, C49, C50, C51, C52, C71, C72

CAP., X5R, 100μF, 6.3V, 20%,1210 AVX 12106D107MAT2A

9 6 C16, C17, C18, C19, C20, C74 CAP., POSCAP, 470μF, 2.5V SANYO, 2R5TPE470M9

10 3 C22, C37, C54 CAP., POSCAP, 470μF, 2.5V AVX 0402YD104KAT2A

11 1 C23 CAP., X7R, 1000pF, 25V, 10%, 0603 AVX 06033A102KAT2A

12 3 C24, C26, C55 CAP., X5R, 10nF, 25V, 10%, 0402 AVX 04023C103KAT2A

13 1 C56 CAP., X5R, 100pF, 25V, 10%, 0603 AVX 06033A101JAT2A

14 1 C25 CAP., NPO, 47pF,25V, 10%, 0603 AVX 06033A470JAT2A

15 1 C42 CAP., X5R, 0.1μF, 10V, 20%, 0603 AVX 0603ZC104MAT2A

16 2 C43, C46 CAP., X7R, 0.01μF,16V, 10%, 0402 AVX 0402YC103KAT2A

17 3 D1, D2, D3 DIODE, SCHOTTKY, SOD-323 CENTRAL CMDSH-3TR

18 3 L1, L2, L3 INDUCTOR, SMT POWER IND. 0.3μH COILCRAFT., XAL7070-301ME

19 3 Q1, Q4, Q5 DUAL N-CHANNEL MOSFET 25V FAIRCHILD FDMS3620S

20 7 Q2, Q3, Q6 TRANS GP SS PNP 40V SOT-416 ON SEMI MMBT3906TT1

21 2 R1, R81 RES., CHIP, 2Ω, 1%, 0603 YAGEO RC0603FR-072RL

22 3 R2, R4, R6 RES., CHIP, 10k, 1%, 0603 NIC NRC06F1002TRF

23 3 R3, R17, R24 RES., CHIP, 10k, 1%, 0402 VISHAY CRCW040210K0FKED

24 6 R7, R8, R18, R19, R44, R45 RES., CHIP, 2.61k, 1%, 0402 VISHAY CRCW04022K61FKED

25 9 R11, R12, R35, R39, R43, R49, R51, R52, R56 RES., CHIP, 0Ω, 1%, 0603 VISHAY CRCW06030000Z0ED

26 6 R10, R14, R15, R22, R38, R94 RES., CHIP, 0Ω, 1%, 0402 VISHAY CRCW04020000Z0ED

27 1 R13 RES., CHIP, 4.53k, 1%, 0603 YAGEO RC0603FR-074K53L

28 2 R25, R26 RES., CHIP, 100Ω, 1%, 0402 VISHAY CRCW0402100RFKED

29 2 R40, R46 RES., CHIP, 4.99k, 1%, 0402 VISHAY CRCW04024K99FKEA

30 1 U1 IC, LTC3880EUJ, QFN 6mm x 6mm LINEAR TECH., LTC3880EUJ#0125-1PBF

31 1 U2 IC, LTC3883EUH, QFN 5mm x 5mm LINEAR TECH., LTC3883EUH#0126-1PBF

Additional Circuit Components

1 2 C60, C64 CAP., X7R, 4.7μF,16V, 10%, 0603 TDK C1608X5R1C475K

2 1 C59 CAP., X7R, 100nF, 25V, 10%, 0603 AVX 06033C104KAT2A

3 1 C70 CAP., X5R, 1μF, 10V, 20%, 0805 AVX 0805ZD105KAT2A

4 4 C61, C62, C65, C67, C68 CAP., X5R, 1μF, 10V, 20%, 1206 AVX 1206YD105KAT2A

5 0 C15, C57, C73 (OPT) CAP., OPTIONAL

dc2052af

DEMO MANUAL DC2052A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURE/PART NUMBER

6 1 C66 CAP., X5R, 2.2μF, 16V, 10%, 0805 AVX 0805YD224KAT2A

7 1 C58 CAP., X5R, 10nF, 25V, 10%, 0603 AVX 06033A103JAT2A

8 1 C63 CAP., X5R, 10uF,25V, 20%,1206 Taiyo Yuden TMK316BJ106ML

9 1 C69 CAP., X5R, 150pF, 25V, 20%, 0603 AVX 06033C151KAT2A

10 1 D4 LED GREEN S-GW TYPE SMD PANASONIC LN1371SGTRP

11 1 D5 LED RED S-TYPE GULL WING SMD PANASONIC LN1271RTR

12 3 Q7, Q8, Q9 MOSFET P-CH 20V 0.58A SOT-23 VISHAY, TP0101K-T1-E3

13 1 Q10 MOSFET N-CH 60V 115MA SOT-23 FAIRCHILD, 2N7002K-7-F

14 1 Q11 MOSFET SPEED SRS 30V 30A LFPAK RENESAS, RJK0305DPB-00#J0

15 1 R27 RES., CHIP, 2Ω, 1%, 0603 Yageo RC0603FR-072RL

16 4 R63, R64, R70, R88 RES., CHIP, 10k, 1%, 0603 NIC NRC06F1002TRF

17 1 R5 RESISTOR 0.005Ω 1W 1% 0815 SUSMU RL3270WT-R005-F

18 R9, R16, R23, R28, R29, R30, R31, R32, R33,

R34, R36, R37, R41, R42, R47, R48, R53,

R54, R59, R61, R66, R73, R75, R95

RES., OPTIONAL

19 2 R20, R50 RES., CHIP, 16.2k, 1%, 0402 VISHAY CRCW040216K2FKED

20 1 R21 RES., CHIP, 17.4k, 1%, 0402 VISHAY CRCW040217K4FKEA

21 1 R55 RES., CHIP, 20.5k, 1%, 0402 VISHAY CRCW040220K5FKED

22 11 R11, R12, R35, R39, R43, R49, R51, R52, R56 RES., CHIP, 0Ω, 1%, 0603 VISHAY CRCW06030000Z0ED

23 4 R60, R62, R65, R67 RES., CHIP, 0Ω, 1%, 0603 VISHAY CRCW06030000Z0ED

24 2 R76, R77 RES., CHIP, 4.99k, 1%, 0603 VISHAY CRCW06034K99FKEA

25 2 R68, R69 RES., CHIP, 15.8k, 1%, 0603 ROHM, MCR03EZPFX1582

26 2 R71, R90 RES., CHIP, 10Ω, 1%, 0603 NIC NRC06F10R0TRF

27 1 R72 RES., CHIP, 200Ω, 1%, 0603 NIC NRC06F2000TRF

28 1 R74 RES., CHIP, 127Ω, 1%, 0603 VISHAY CRCW0603127RFKEA

29 3 R78, R79, R80 RES., CHIP, 100k, 1%, 0603 NIC NRC06F1003TRF

30 1 R82 RES., CHIP, 1M, 1%, 0603 NIC NRC06f1004TRF

31 1 R83 RES., CHIP, 154k, 1%, 0603 VISHAY CRCW0603154KFKEA

32 2 R84, R86 RES., CHIP, 20k, 1%, 0603 NIC NRC06F2002TRF

33 1 R85 RES., CHIP, 3.3Ω, 1%, 0603 VISHAY CRCW06033R30JNEA

34 1 R87 RES., CHIP, 681k, 1%, 0603 VISHAY CRCW0603681KFKEA

35 1 R89 RES., CHIP, 82.5Ω, 1%, 0603 VISHAY CRCW060382R5FKEA

36 1 R91 RES., CHIP, 0.01Ω, 1%, 2010 VISHAY, WSL2010R0100FEA

37 1 R92 TRIMMING POTENTIOMETER, 5k BOURNS, 3386P-1-502LF

38 1 U3 IC, 24LC025-I/ST, SOIC MICROCHIP, 24LC025-I/ST

39 2 U4, U6 IC, LT1129CS8-5, S8 PACKAGE LINEAR TECH, LT1129CS8-5

40 1 U5 IC, LT1129CS8-3.3 S8 PACKAGE LINEAR TECH. LT1129CS8-3.3

41 1 U7 IC., LTC6992-1, S6-TSOT LINEAR TECH. LTC6992CS6-1

42 1 U8 IC., LT1803IS5, S5-TSOT LINEAR TECH. LT1803IS5

dc2052af

DEMO MANUAL DC2052A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURE/PART NUMBER

Hardware

1 15 E1-E5, E7, E8, E10, E12-E14, E18-E24 TESTPOINT, TURRET, 0.062" MILL-MAX, 2308-2-00-80-00-00-07-0

2 4 J1-J4 STUD, TEST PIN PEM KFH-032-10

3 8 J1-J4 (x2) NUT, BRASS 10-32 ANY #10-32

4 4 J1-J4 RING, LUG #10 KEYSTONE, 8205, #10

5 4 J1-J4 WASHER, TIN PLATED BRASS ANY #10

6 1 SW1 CONNECTOR, SUB MINIATURE SLIDE

SWITCHES

C&K., JS202011CQN

7 4 JP1-JP4 HEADER 3 PIN 0.079 SINGLE ROW SAMTEC, TMM103-02-L-S

8 4 JP1-JP4 SHUNT SAMTEC, 2SN-BK-G

9 1 J6 PIN HEADER 20 DUAL ROW RA (M) MILL MAX 802-40-020-20-0001

10 1 J7 CONN HEADER 12POS 2MM STR DL

PCB

FCI 98414-G06-12ULF

11 1 J8 CONN SOCKET 20 DUAL ROW RA (F) MILL MAX 803-93-020-20-001

12 2 J9, J10 CONN, BNC, 5 PINS CONNEX, 112404

13 4 MTH1-MTH4 STAND-OFF, NYLON 0.50" tall KEYSTONE, 8833(SNAP ON)

14 2 STENCIL (TOP & BOTTOM) STENCIL DC2052AT

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