Linear Technology LTM4677EY Kurzanleitung zur Einrichtung

dc2066af

DEMO MANUAL DC2066A

DESCRIPTION

LTM4677EY

Dual 18A or Single 36A µModule Regulator

With Digital Power System Management

Demonstration circuit 2066A is a dual-output,high ef-

ficiency, high density, µModule regulator with 4.5V to

16V input range.Each output can supply 18A maximum

load current.The demo board has a LT M

4677 µModule

regulator, which is a dual 18A or single 36A step-down

regulator with digital power system management.Please

see the LTM4677 data sheet for more detailed information.

DC2066A powersup todefault settingsand producespower

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

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

Technology Corporation. All other trademarks are the property of their respective owners.

BOARD PHOTO

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 L

TpowerPlay,please

refer to LTpowerPlay GUI for LTM4677 Quick Start Guide.

Design files for this circuit board are available at

http://www.linear.com/demo/DC2066A

Figure1. Dual-Output LTM4677/DC2066A Demo Circuit

dc2066af

DEMO MANUAL DC2066A

QUICK START PROCEDURE

Table 2. LTM4677 Demo Boards for Up To 140A Point-of-Load Regulation

MAXIMUM OUTPUT CURRENT NUMBER OF OUTPUTS

NUMBER OF LTM4676

µMODULE REGULATORS ON THE BOARD DEMO BOARD NUMBER

Dual 18A 2 1 DC2066A

70A 1 2 DC2143A-A

105A 1 3 DC2143A-B

140A 1 4 DC2143A-C

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 LTM4677

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.

Demonstration circuit 2066A is easy to set up to evaluate

the performance of the LTM4677EY. 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 16V) 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: SW1: ON; SW2: 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 1.8V ±1%.

PERFORMANCE SUMMARY

Table 1. Performance Summary (TA= 25°C)

PARAMETER CONDITIONS MIN TYP MAX UNITS

Input Voltage Range 4.5 16 V

Output Voltage, VOUT0 VIN = 4.5V to 16V, IOUT0 = 0A to 18A 0.5 1.8 V

Maximum Output Current, IOUT0 VIN = 4.5V to 16V, VOUT0 = 0.5V to 1.8V 18 A

Output Voltage, VOUT1 VIN = 4.5V to 16V, IOUT1 = 0A to 18A 0.5 1.8 V

Maximum Output Current, IOUT1 VIN = 4.5V to 16V, VOUT1 = 0.5V to 1.8V 18 A

Typical Efficiency VIN = 12V, VOUT1 = 1.8V, IOUT1 = 18A 87.9

(See Figures 5 and 6)

Default Switching Frequency 500 kHz

dc2066af

DEMO MANUAL DC2066A

–

LOAD1

0A TO 18A

–

IOUT1

VOUT1

+–

LOAD0

0A TO 18A

+–

IOUT0

VOUT0

–

+–

IIN

4.5V TO 16V

VIN

DC2066A F02

+ –

VOUT GND

COUT

Figure2. Proper Measurement Equipment Setup

Figure3. Measuring Output Voltage Ripple

QUICK START PROCEDURE

dc2066af

DEMO MANUAL DC2066A

QUICK START PROCEDURE

Connecting a PC to DC2066A

You can use a PC to reconfigure the power management

features of the LTM4677 such as:nominal VOUT,margin

setpoints,OV/UV limits,temperaturefault limits,sequenc-

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

otherfunctionalities.The DC1613A dongle may be plugged

when VIN is present.

VOUT0

VOUT1

12-PIN (J1)

CONNECTOR

USB CABLE VIN

INPUT POWER

SUPPLY

LOAD0

LOAD 1

USB TO I2C/PMBus

DONGLE DC1613A

LTM4677 DEMO

BOARD DC2066A

LOAD CURRENT (A)

0.0

EFFICIENCY (%)

60 10.06.0 14.0 18.08.0 16.04.0 12.02.0

VO= 0.9V

VO= 1.0V

VO= 1.2V

VO= 1.5V

VO= 1.8V

VIN = 5V, fS= 500kHz, CCM

LOAD CURRENT (A)

0.0

EFFICIENCY (%)

60 10.06.0 14.0 18.08.0 16.04.0 12.02.0

VO= 0.9V

VO= 1.0V

VO= 1.2V

VO= 1.5V

VO= 1.8V

VIN = 12V, fS= 500kHz, CCM

Figure4. Demo Setup with PC

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

dc2066af

DEMO MANUAL DC2066A

QUICK START PROCEDURE

Figure7. Output Voltage VOUT0 vs Load Current

(VOUT0=1.0V), Measured by 1X Probe on COUT8

Figure9. Output Voltage Ripple at VIN=12V,

VOUT0=1.0V, IOUT0=18A, Measured by 1X Probe on COUT8

Figure8. Output Voltage VOUT1 vs Load Current

(VOUT1=1.8V), Measured by 1X Probe on COUT3

Figure10. Output Voltage Ripple at VIN = 12V,

VOUT1 = 1.8V, IOUT1 = 18A, Measured by 1X Probe on COUT3

Figure11. Thermal at VIN = 12V, VOUT0=1.0V, IOUT0 = 18A, VOUT1 = 1.8V, IOUT1 = 18A, TA= 25°C, 200LFM Airflow

50µs/DIV

0A TO 4.5A

LOAD STEP

VOUT0

(20MHz BW)

20mV/DIV

50µs/DIV

0A TO 4.5A

LOAD STEP

VOUT1

(20MHz BW)

20mV/DIV

1.0µs/DIV

VOUT0

(20MHz BW)

20mV/DIV

VOUT1

(20MHz BW)

20mV/DIV

1.0µs/DIV

dc2066af

DEMO MANUAL DC2066A

LTpowerPlay SOFTWARE GUI

LTpowerPlay is a powerful Windows based development

environment that supports Linear Technology power

system management ICs and μModules, including the

LTM4675, LTM4676, LTM4677, LTC3880, LTC3882,

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 LTM4675,

LTM4676, LTM4677, LTC3880, LTC3882, LTC3883’s

demo system or a customer board.The software also

provides an automatic update feature to keep the software

currentwith the latestset ofdevice driversand documenta-

tion. 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 12. LTpowerPlay Main Interface

dc2066af

DEMO MANUAL DC2066A

LTpowerPlay QUICK START GUIDE

The followingprocedure describes howto use LTpowerPlay

to monitor and change the settings of LTM4677.

1.Download and install the LTpowerPlay GUI:

http://linear.com/ltpowerplay

2. Launch the LTpowerPlay GUI.

a. The GUI should automatically identify the DC2066A.

The system tree on the left hand side should look

like this:

b. A blue message box shows for a few seconds in the

lower left hand corner,confirming that LTM4677 is

communicating:

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

read the RAM from the LTM4677. This reads the

configuration from the RAM of LTM4677 and loads

it into the GUI.

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

step,youwillseetheoutputvoltagewillchangeto1.5V.

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:

dc2066af

DEMO MANUAL DC2066A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 CIN1 CAP., 150µF, 35V, ALUMINUM ELECTR., SUN ELECTRONIC INDUSTRIES,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 6 COUT4, COUT5, COUT9-12 CAP., 470µF, 2.5V, SP-CAP, D SIZE PANASONIC, EEFGX0E471R

5 1 C26 CAP., X5R, 100nF, 16V, 10%, 0603 AVX, 0603YD104KAT

6 2 C27, C28 CAP., X7R, 10nF, 25V, 5%, 0603 AVX, 06033C103JAT

7 1 C23 CAP., X7R, 1µF, 25V, 10%, 0805 AVX, 08053C105KAT2A

8 3 C21, C22, C24 CAP., X5R, 1µF, 25V, 10%, 0603 AVX, 06033D105KAT2A

9 12 R10-R16, R18, R19, R24, R52, R77 RES., CHIP, 10k, 1%, 0603 NIC, NRC06F1002TRF

10 1 R30 RES., CHIP, 6.34k, 1%, 0603 VISHAY, CRCW06036K34FKEA

11 2 R72, R73 RES., CHIP, 4.99k, 1%, 0603 NIC, NRC06F4991TRF

12 1 U1 I.C., LTM4677EY#PBF LINEAR TECH., LTM4677EY#PBF

13 1 U2 I.C., EEPROM SERIAL-I2C, 2k-BIT, I.C., TSSOP-8 MICROCHIP, 24LC025-I/ST

14 2 R2, R22 RES., CHIP, 17.8k, 1%, 0603 VISHAY, CRCW060317K8FKEA

15 2 C1, C14 CAP., X7R, 1.8nF, 25V, 5%, 0603 AVX, 06033C182JAT2A

Additional Demo Board Circuit Components

16 0 C2, C15-C17 (OPT) CAP., 0603 OPTIONAL

17 1 Q1 N-CHANNEL 30-V MOSFET VISHAY, SUD50N03-09P

18 10 R3, R7, R9, R25, R31, R32, R33,

R63, R65, R66

RES., CHIP, 0Ω, 1%, 0603 NIC, NRC06Z0000TRF

19 0 R8, R26, R27, R28, R29, R35, R38,

R41, R61, R62, R64, R67, R68, R74,

R75, R83, R88, R89, R6, R23 (OPT)

RES., 0603 OPTIONAL

20 0 R17, R20, R49, R82 (OPT) RES., CHIP OPTIONAL

21 1 R48 RES., CHIP, 0Ω, 0.5W, 2010 NIC, NRC50ZOTRF

22 1 R53 RES., CHIP, 0.01Ω, 1/2W, 1%, 2010 VISHAY, WSL2010R0100FEA

23 2 R69, R70 RES., CHIP, 10Ω, 1%, 0603 NIC, NRC06F10R0TRF

24 1 R78 RES., CHIP, 15.8k, 1%, 0603 NIC, NRC06F1582TRF

25 0 D1, D2 (OPT) DIODE OPTIONAL

26 1 Q19 MOSFET P-CH 20V 0.58A SOT-23 VISHAY TP0101K-T1-E3

Hardware: For Demo Board Only

27 2 SW0, SW1 HEADER 3 PIN 0.079 SINGLE ROW SAMTEC, TMM103-02-L-S

28 3 J2-J4 CONN, BNC, 5 PINS CONNEX, 112404

29 1 J1 CONN HEADER 12POS 2mm STR DL PCB FCI 98414-G06-12ULF

30 24 E1-E24 TESTPOINT, TURRET, 0.062" MILL-MAX, 2308-2-00-80-00-00-07-0

31 6 J5-J10 BANANA SMALL KEYSTONE, 575-4

32 2 XJP1, XJP2 SHUNT SAMTEC, 2SN-BK-G

33 4 (STAND-OFF) STAND-OFF, NYLON 0.50" tall KEYSTONE, 8833(SNAP ON)

34 1 J12 CONN RECEPT 2mm DUAL R/A 14POS SULLINS, NPPN072FJFN-RC

35 1 J11 CONN HEADER 14POS 2mm R/A GOLD MOLEX, 87760-1416

dc2066af

DEMO MANUAL DC2066A

SCHEMATIC DIAGRAM

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE 0603.

ALL CAPACITORS ARE 0603.

35V

4.5V - 16V

1.0V / 18A

2.5V

EEFGX0E471R

1.8V / 18A

2.5V

EEFGX0E471R

1210 1210 1210

1210 1210 1210 1210

1210 1210 1210

0.035 VIA

TESTPOINTS

WITH DIGITAL POWER MANAGEMENT

WHEN VIN < 5.75V, SHORT INTVCC TO VIN WITH R8 = 0ohm.

OFF

VOSNS0+

VOSNS0-

SYNC

SHARE_CLK

ALERTB

SCL

SDA

GPIO0B

GPIO1B

ASEL

FREQ_CFG

VOUT0_CFG

VTRIM0_CFG

VOUT1_CFG

VTRIM1_CFG

RUN1

VDD25

RUN0

INTVCC

VOSNS1

VIN

VOUT0

VOUT1

VIN

SYNC

SHARE_CLK

ALERTB

SCL

SDA

GPIO0B

GPIO1B

COMP0a

COMP1a

RUN0

RUN1

VDD33

SIZE

DATE:

.VER.ONCI

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Friday, July 17, 2015

1 3

DUAL STEP-DOWN uMODULE REGULATOR

HAORAN W.

LTM4677EY

DEMO CIRCUIT 2066A

SIZE

DATE:

.VER.ONCI

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Friday, July 17, 2015

1 3

DUAL STEP-DOWN uMODULE REGULATOR

HAORAN W.

LTM4677EY

DEMO CIRCUIT 2066A

SIZE

DATE:

.VER.ONCI

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Friday, July 17, 2015

1 3

DUAL STEP-DOWN uMODULE REGULATOR

HAORAN W.

LTM4677EY

DEMO CIRCUIT 2066A

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

HAORAN W.PRODUCTION 51-71-71

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

HAORAN W.PRODUCTION 51-71-71

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

HAORAN W.PRODUCTION 51-71-71

E13

GPIO0B

VIN

COUT1

100uF

COUT11

470uF

EEFGX0E471R

2.5V

CIN3

10uF

VOUT0

R18

10K

CIN2

10uF

R9 0

SW0

RUN0

SYNC

R10

10K

COUT10

470uF

EEFGX0E471R

2.5V

R7 0

E17

GND0_SNS

R33

COUT7

100uF

R8 OPT

OPT

J10

VIN

CIN5

10uF

R20 OPT

0805

GND

LTM4677EY

VOUT0

VOUT1 J1

VOUT1 J2

VOUT1 J3

VOUT1 K1

VOUT0

VOUT1 K2

VOUT1 K3

VOUT1 L1

VOUT1 L2

VOUT0

GND

VOUT1 L3

VOUT1 M1

VOUT1 M2

VOUT1 M3

GND

A10

GND

ASEL G4

FSWPHCFG H4

GND

GPIO0 E4

GPIO1 F4

SNUB0

GND

TSNS0B

TSNS0A

ALERT E5

RUN0 F5

VOUT0CFG G5

VTRIM0CFG H5

TSNS1A J5

TSNS1B K5

GND

SNUB1 M5

GND

SDA D6

SCL E6

RUN1 F6

VOUT1CFG G6

VTRIM1CFG H6

VDD25 J6

WP K6

GND

F10

GND

G10

SYNC E7

GND

M10

SHARE_CLK H7

VDD33 J7

GND

G11

GND

G12

GND

L8 GND

GND

COMP0b

COMP0a

SGND

COMP1a H8

COMP1b J8

GND

H10

GND

VOSNS0+

VOSNS0-

INTVCC F9

INTVCC G9

VOSNS1 H9

VORB1 J9

GND

J10

GND

SW0

B10

E11

VORB0+

D10

VORB0-

E10

GND

C10

SW1 L10

GND

VIN0

B12 VIN0

B11 VIN0

A12 VIN0

A11

K10

SVIN

F12

GND

H11

VIN1 H12

VIN1 J11

VIN1 J12

VIN1 K11

VIN0

E12 VIN0

D12 VIN0

D11 VIN0

C12 VIN0

C11

SVIN

F11

GND

VIN1 K12

VIN1 L11

VIN1 L12

VIN1 M11

VIN1 M12

SGND

GND

ISNS0a-

ISNS0b-

ISNS0b+

F1 ISNS0a+

ISNS1b-G1

ISNS1a-G2

ISNS1b+H1

ISNS1a+H2

E16

VDD25

R14

10K

R32 0

COUT8

100uF

C14

1.8nF

COUT5

470uF

R24

10K

R30

GND1_SNS

SW1

RUN1

R29 (OPT)

R16

10K

VDD33

COUT6

100uF

E12

SDA

C15

OPT

GND

R25

COUT9

470uF

2.5V

EEFGX0E471R

C17

OPT

R11

10K

COUT4

470uF

R19

10K

R23 OPT

E14

GPIO1B

COUT3

100uF

E15

VOUT0_SNS

COUT2

100uF

GND

OPT

R27 (OPT)

INTVCC

CIN1

150uF

R15

10K

17.8K

VOUT1_SNS

E10

ALERTB

R17 OPT

0805

R13

10K

E11

SCL

R22

17.8K

COUT12

470uF

EEFGX0E471R

2.5V

R12

10K

SHARE_CLK

CIN4

10uF

R28 (OPT)

GND

C16

OPT

J6 VOUT1

R31

6.34K

R26 (OPT)

GND

Figure12. DC2066A Demo Circuit Schematic, Page 1

dc2066af

DEMO MANUAL DC2066A

SCHEMATIC DIAGRAM

D D

B B

A A

ALL PARTS ON THIS PAGE ARE FOR DEMO ONLY, NOT NEEDED IN CUSTOMER DESIGN

OPT

2010 2010

OPT

VOUT1

DYNAMIC LOAD CIRCUIT

DO NOT EXCEED 5% DUTY CYCLE!

BLEEDER LOADS

OPTIONAL JUMPER FOR DUAL PHASE

SINGLE OUTPUT CONFIGURATION

2010

WITH DIGITAL POWER MANAGEMENT

VOUT0 VOUT1 VOUT0 VOUT1

COMP0a COMP1a

GPIO0B GPIO1B

RUN0RUN1

SIZE

DATE:

.VER.ONCI

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Friday, July 17, 2015

2 3

DUAL STEP-DOWN uMODULE REGULATOR

HAORAN W.

N/A

LTM4677EY

DEMO CIRCUIT 2066A

SIZE

DATE:

.VER.ONCI

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Friday, July 17, 2015

2 3

DUAL STEP-DOWN uMODULE REGULATOR

HAORAN W.

N/A

LTM4677EY

DEMO CIRCUIT 2066A

SIZE

DATE:

.VER.ONCI

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

CUSTOMER NOTICE

LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A

CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;

HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO

VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL

APPLICATION. COMPONENT SUBSTITUTION AND PRINTED

CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT

PERFORMANCE OR RELIABILITY. CONTACT LINEAR

TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

Friday, July 17, 2015

2 3

DUAL STEP-DOWN uMODULE REGULATOR

HAORAN W.

N/A

LTM4677EY

DEMO CIRCUIT 2066A

R52

10K

R38 OPT

E22

GND

R50

SUD50N03-09P

R49

2010

OPT

IOSTEP

E23

SGND

R48

2010

0.5W

R35 OPT

VOUT0

C24

1uF

C22

1uF

R41 OPT

E20

IOSTEP_CLK

R51

E24

SGND

C21

1uF

R53

0.01

C23

1uF

Figure13. DC2066A Demo Circuit Schematic, Page 2

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