Linear Technology DC1811B-A Quick setup guide

dc1811baf

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 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

TheDC1811B-Apowersuptodefaultsettingsandproduces

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 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

dc1811baf

DEMO MANUAL DC1811B-A

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. Oncetheproperoutputvoltagesareestablished,adjustthe

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

setpoints, OV/UVlimits,temperaturefaultlimits,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 VOLTAGES

NUMBER 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

dc1811baf

DEMO MANUAL DC1811B-A

QUICK START PROCEDURE

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

dc1811baf

DEMO MANUAL DC1811B-A

QUICK START PROCEDURE

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)

EFFICIENCY (%)

6 7 8 109 11 12

100

DC1811A F05

12345 13

VOUT = 1V

VOUT = 1.2V

VOUT = 1.5V

VOUT = 1.8V

VOUT = 2.5V

VOUT = 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)

EFFICIENCY (%)

6 7 8 109 11 12

DC1811A F06

12345 13

VOUT = 1V

VOUT = 1.2V

VOUT = 1.5V

VOUT = 1.8V

VOUT = 2.5V

VOUT = 3.3V

VOUT = 5V

VIN = 12V

fSW = 500kHz

CCM

dc1811baf

DEMO MANUAL DC1811B-A

QUICK START PROCEDURE

VOUT0

(20MHz BW)

50mV/DIV

9.75A TO 13A

LOAD 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 13A

LOAD 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

dc1811baf

DEMO MANUAL DC1811B-A

LTpowerPlay SOFTWARE GUI

LTpowerPlay 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

latertime.LTpowerPlay provides unprecedenteddiagnostic

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:

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 12. LTpowerPlay Main Interface

dc1811baf

DEMO MANUAL DC1811B-A

LTpowerPlay QUICK START GUIDE

Thefollowingprocedure describes howtouseLTpowerPlay

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. TheGUIshould automatically identify theDC1811B-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

registervaluestotheLTM4676.Afterfinishingthisstep,

you will see the output voltage will change to 1.5V.

Ifthewrite issuccessful,youwill seethefollowingmessage:

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:

dc1811baf

DEMO MANUAL DC1811B-A

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 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 Components

1 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 Only

1 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

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

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

dc1811baf

DEMO MANUAL DC1811B-A

SCHEMATIC DIAGRAM

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE 0603.

ALL CAPACITORS ARE 0603.

35V

4.5V - 26.5V

1.0V / 13A

6.3V

6TPF330M9L

1.8V / 13A

6.3V

6TPF330M9L

1210 1210 1210

OPT

0805

OFF

1210 1210 1210 1210

1210 1210 1210

0.035 VIA

TESTPOINTS

WITH POWER SYSTEM MANAGEMENT

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

B - A

B - B

LTM4676EY

LTM4676AEY

VOSNS0+

VOSNS0-

VDD33

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:

IC NO. REV.

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, October 24, 2014

DUAL STEP-DOWN uMODULE REGULATOR

JIAN L.

LTM4676EY + LTM4676AEY

DEMO CIRCUIT 1811B

SIZE

DATE:

IC NO. REV.

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, October 24, 2014

DUAL STEP-DOWN uMODULE REGULATOR

JIAN L.

LTM4676EY + LTM4676AEY

DEMO CIRCUIT 1811B

SIZE

DATE:

IC NO. REV.

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, October 24, 2014

DUAL STEP-DOWN uMODULE REGULATOR

JIAN L.

LTM4676EY + LTM4676AEY

DEMO CIRCUIT 1811B

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

JIAN L.PRODUCTION1 6-2-14

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

JIAN L.PRODUCTION1 6-2-14

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

JIAN L.PRODUCTION1 6-2-14

E13

GPIO0B

E13

GPIO0B

VIN

COUT1

100uF

COUT1

100uF

CIN3

10uF

CIN3

10uF

VOUT0 J7

VOUT0

R18

10K

R18

10K

CIN2

10uF

CIN2

10uF

R9 0R9 0 E9

SYNC

R10

10K

R10

10K

R7 0R7 0

E17

GND0_SNS

E17

GND0_SNS

OPT

R33

OPT

R33

OPT

COUT7

100uF

COUT7

100uF

R8 OPTR8 OPT

OPT

J10

VIN

J10

VIN

CIN5

10uF

CIN5

10uF

GND

E16

VDD25

E16

VDD25

R14

10K

R14

10K

R32 0R32 0

COUT8

100uF

COUT8

100uF

C14

2200pF

C14

2200pF

COUT5

330uF

COUT5

330uF

P1P1

R24

10K

R24

10K

LTM4676EY / LTM4676AEY

VOUT0

ISNS0b-

ISNS0b+

ISNS1b- G1

ISNS1b+ H1

VOUT1 J1

VOUT1 J2

VOUT1 J3

VOUT1 K1

VOUT0

ISNS0a-

ISNS0a+

ISNS1a- G2

ISNS1a+ H2

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

DNC

E11

VORB0+

D10

VORB0-

E10

GND

DNC

C10

SW1 L10

GND

VINH0

B12 VINH0

B11 VINH0

A12 VINH0

A11

DNC

K10

VINL

F12

GND

DNC

H11

VINH1 H12

VINH1 J11

VINH1 J12

VINH1 K11

VINH0

E12 VINH0

D12 VINH0

D11 VINH0

C12 VINH0

C11

VINL

F11

GND

VINH1 K12

VINH1 L11

VINH1 L12

VINH1 M11

VINH1 M12

SGND

GND

R30 6.34KR30 6.34K

GND1_SNS

R29 (OPT)

R16

10K

R16

10K

VDD33

COUT6

100uF

COUT6

100uF

E12

SDA

E12

SDA

C15

OPT

C15

OPT

R20

0805

R20

0805

P2P2

GND

R25

P4P4

C17

OPT

C17

OPT

R11

10K

R11

10K

COUT4

330uF

COUT4

330uF

R19

10K

R19

10K

P5P5

R23 OPTR23 OPT

E14

GPIO1B

E14

GPIO1B

COUT3

100uF

COUT3

100uF

E15

VOUT0_SNS E15

VOUT0_SNS

COUT2

100uF

COUT2

100uF

GND

OPT

R27 (OPT)R27 (OPT)

INTVCC

CIN1

150uF

CIN1

150uF

R15

10K

R15

10K

4.99K

VOUT1_SNS

E10

ALERTB

E10

ALERTB

JP1

RUN0

JP1

RUN0

R13

10K

R13

10K

E11

SCL

E11

SCL

R22

4.22K

R22

4.22K

R12

10K

R12

10K

SHARE_CLK

P3P3

CIN4

10uF

CIN4

10uF

JP2

OFF

RUN1

JP2

OFF

RUN1

R28 (OPT)R28 (OPT)

GND

C16

OPT

C16

OPT

J6 VOUT1

R31 0R31 0

R26 (OPT)R26 (OPT)

GND

dc1811baf

DEMO MANUAL DC1811B-A

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

D D

C C

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 POWER SYSTEM MANAGEMENT

VOUT0 VOUT1

COMP0a COMP1a

GPIO0B GPIO1B

RUN0RUN1

SIZE

DATE:

IC NO. REV.

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, October 24, 2014

DUAL STEP-DOWN uMODULE REGULATOR

JIAN L.

N/A

LTM4676EY / LTM4676AEY

DEMO CIRCUIT 1811B

SIZE

DATE:

IC NO. REV.

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, October 24, 2014

DUAL STEP-DOWN uMODULE REGULATOR

JIAN L.

N/A

LTM4676EY / LTM4676AEY

DEMO CIRCUIT 1811B

SIZE

DATE:

IC NO. REV.

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, October 24, 2014

DUAL STEP-DOWN uMODULE REGULATOR

JIAN L.

N/A

LTM4676EY / LTM4676AEY

DEMO CIRCUIT 1811B

R52

10K

R52

10K

R38 OPTR38 OPT E22

GND

E22

GND

J3J3

R50R50

SUD50N04

R49

2010

OPT

R49

2010

OPT

IOSTEP

E23

SGND

E23

SGND

R48

2010

0.5W

R48

2010

0.5W

R35 OPTR35 OPT

VOUT0

C24

1uF

C24

1uF

C22

1uF

C22

1uF

R41 OPT.R41 OPT.

E20

IOSTEP_CLK

E20

IOSTEP_CLK

R51R51

E24

SGND E24

SGND

C21

1uF

C21

1uF

R53

0.01

R53

0.01

C23

1uF

C23

1uF

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