Analog Devices DC2910A Quick setup guide

DEMO MANUAL DC2910A

Rev. 0

DESCRIPTION

LTM4691

Low VIN, High Efficiency, Dual 2A Step-down

μModule DC/DC Converter

Demonstration circuit 2910A is low VIN, high efficiency,

and dual 2A output µModule DC/DC converter. The

board operates by default at a fixed 2MHz and can be

synchronized from 1MHz to 3MHz via the MODE/SYNC

pin. With its high switching frequency and current mode

architecture, a fast transient response to line and load

changes is possible without sacrificing stability. The

DC2910A can be used in forced continuous mode or pulse

skip mode for low noise, or in burst mode operation for All registered trademarks and trademarks are the property of their respective owners.

PERFORMANCE SUMMARY

BOARD PHOTO

high efficiency at light loads. The demo board features

the LTM

4691, which is available in a low profile 3mm

x 4mm x 1.2mm LGA package. Please see the LTM4691

datasheet for more detailed information.

It is recommended to read the data sheet for the LTM4691

prior to making any changes to the DC2910A.

Design files for this circuit board are available.

Specifications are at TA= 25°C

PARAMETER CONDITIONS VALUE

Input Voltage Range 2.35V to 3.6V

Output Voltage, VOUT VIN = 2.35V – 3.6V, IOUT = 0A to 2A VOUT1 = 1.2V

VOUT2 = 1.8V

Maximum Output Current, IOUT VIN = 2.35V – 3.6V 2A

Typical Efficiency VIN = 3.3V, VOUT1 = 1.2V, IOUT = 2A

VIN = 3.3V, VOUT2 = 1.8V, IOUT = 2A

84%

88%

Peak Efficiency VIN = 3.3V, VOUT1 = 1.2V

VIN = 3.3V, VOUT2 = 1.8V

89%

92%

Switching Frequency 2MHz

DEMO MANUAL DC2910A

Rev. 0

QUICK START PROCEDURE

Demonstration circuit 2910A is easy to set up to evaluate

the performance of the LTM4691. Refer to Figure1 for

the proper measurement equipment setup and follow the

procedure below.

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

(2.35V-3.6V) and GND (input return).

2. Connect the output loads between VOUT and GND

(Initial load: no load). Refer to Figure1.

3. Connect the DVMs to the input and output.

4. Check the default jumper position: JP2 (RUN1): OFF;

JP3 (RUN2): OFF.

5. Turn on the input power supply and adjust voltage to

2.35V – 3.6V;

NOTE:Make sure that the input voltage does not exceed

4.0V.

6. Change the following jumpers’position: JP2:ON; JP3:ON.

7. Check for the proper output voltages from VOUT to GND

turrets.

8. Once the proper output voltage is established, adjust

the loads within the operating range and measure the

efficiency, output ripple voltage and other parameters.

9. After completing all tests, adjust the load to 0A, power

off the input power supply.

NOTES:

1. 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.

DEMO MANUAL DC2910A

Rev. 0

QUICK START PROCEDURE

–

Load

0A to 2A

Load

0A to 2A

––

–

Figure1. Proper Measurement Equipment Setup

Figure2. Measuring Output Voltage Ripple

Figure3. Efficiency vs. Load Current at VIN = 3.3V, VOUT1 = 1.2V, fSW = 2MHz

DC LOAD CURRENT (A)

EFFICIENCY (%)

60 1.5 210.5

DEMO MANUAL DC2910A

Rev. 0

DC LOAD CURRENT (A)

EFFICIENCY (%)

60 1.5 210.5

QUICK START PROCEDURE

Figure4. Efficiency vs. Load Current at VIN = 3.3V, VOUT2 = 1.8V, fSW = 2MHz

Figure5. Output Voltage Ripple at VIN = 3.3V, VOUT1 = 1.2V, fSW = 2MHz

Figure6. Output Voltage Ripple at VIN = 3.3V, VOUT2 = 1.8V, fSW = 2MHz

1μs/DIV

VOUT1

5mV/DIV

1μs/DIV

VOUT2

5mV/DIV

DEMO MANUAL DC2910A

Rev. 0

Figure7. Load Step at VIN = 3.3V, VOUT1 = 1.2V, fSW = 2MHz

Figure8. Load Step at VIN = 3.3V, VOUT2 = 1.8V, fSW = 2MHz

Figure9. Thermal performance at VIN = 3.3V, VOUT1 = 1.2V, VOUT2 = 1.8V, IOUT1 = 2A, IOUT2 = 2A TA = 23°C, No Forced Airflow

50μs/DIV

VOUT1

20mV/DIV

IOUT1

500mA/DIV

50ms/DIV

VOUT2

20mV/DIV

IOUT2

500mA/DIV

DEMO MANUAL DC2910A

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 C1, C2 CAP., 10uF, X5R, 16V, 10%, 0603 MURATA, GRM188R61C106KAALD

2 2 C3, C4 CAP., 22uF, X6S, 6.3V, 20%, 0603 MURATA, GRM188C80J226ME15D

3 1 C5 CAP., 2.7pF, C0G, 50V, +/-0.25pF, 0402 MURATA, GJM1555C1H2R7CB01D

4 1 C6 CAP., 1.2pF, C0G, 50V, +/-0.05pF, 0402 MURATA, GJM1555C1H1R2WB01D

5 1 C7 CAP., 22uF, TANT. POSCAP, 6.3V, 20%, 2012 (0805)

S09, 150mOHM, TPU, NO SUBS. ALLOWED

KEMET, T529P226M006AAE150

6 1 C8 CAP., 220uF, TANT. POSCAP, 6.3V, 20%, 7343,

18mOHMS, TPE, NO SUBS. ALLOWED

PANASONIC, 6TPE220MI

7 1 R1 RES., 140k OHMS, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402140KFKED

8 2 R2, R4 RES., 100k OHMS, 1%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2RKF1003X

9 1 R3 RES., 261k OHMS, 1%, 1/16W, 0402 VISHAY, CRCW0402261KFKED

10 2 R5, R11 RES., 1M OHM, 5%, 1/16W, 0402 VISHAY, CRCW04021M00JNED

11 2 R6, R7 RES., 20 OHMS, 1%, 0.063W, 0402 VISHAY, CRCW040220R0FKED

12 1 R8 RES., 10k OHMS, 1%, 1/10W, 0402 PANASONIC, ERJ2RKF1002X

13 2 R9, R10 RES., 100k OHMS, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KJNED

14 1 R12 RES., 10M OHMS, 1%, 1/16W, 0402 VISHAY, CRCW040210M0FKED

15 1 U1 IC, Dual 2A Step-Down uMODULE REG, 24-PIN LGA ANALOG DEVICES, LTM4691EY#PBF

Additional Demo Board Circuit Components

1 0 C9-C12 CAP., OPTION, 0402

2 0 C13-C16 CAP., OPTION, 0603

Hardware: For Demo Board Only

1 11 E1-E11 TEST POINT, TURRET, 0.094", MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0

2 2 JP2, JP3 CONN., HDR, MALE, 1x3, 2mm, VERT, STR, THT WURTH ELEKTRONIK, 62000311121

3 4 MP1-MP4 STANDOFF, NYLON, SNAP-ON, 0.375" KEYSTONE, 8832

4 3 XJP1-XJP3 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421

DEMO MANUAL DC2910A

Rev. 0

Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog

Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications

subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

SCHEMATIC DIAGRAM

D D

C C

B B

A A

NOTE: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS AND CAPACITORS ARE 0402.

REVISION HISTORY

ECO REV DESCRIPTION APPROVEDDATE

5 PROD 09/18/19 B L

m

VIN

DATE:

SHEET OF

TITLE: SCHEMATIC

APPROVALS

PCB DES.

APP ENG.

Phone: (408)432-1900

SIZE:

SCHEMATIC NO. AND REVISION:

CUSTOMER NOTICE

THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND

SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.

www.analog.com

SKU NO.

IC NO.

ANALOG DEVICES 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 ANALOG DEVICES

APPLICATIONS ENGINEERING FOR ASSISTANCE.

1 1

M I

B L

DUAL 2A STEP-DOWN DC/DC MODULE REGULATOR

710-DC2910A_REV05

DC2910A

N/A

Tuesday, February 18, 2020

LTM4691EY

DATE:

SHEET OF

TITLE: SCHEMATIC

APPROVALS

PCB DES.

APP ENG.

Phone: (408)432-1900

SIZE:

SCHEMATIC NO. AND REVISION:

CUSTOMER NOTICE

THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND

SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.

www.analog.com

SKU NO.

IC NO.

ANALOG DEVICES 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 ANALOG DEVICES

APPLICATIONS ENGINEERING FOR ASSISTANCE.

1 1

M I

B L

DUAL 2A STEP-DOWN DC/DC MODULE REGULATOR

710-DC2910A_REV05

DC2910A

N/A

Tuesday, February 18, 2020

LTM4691EY

DATE:

SHEET OF

TITLE: SCHEMATIC

APPROVALS

PCB DES.

APP ENG.

Phone: (408)432-1900

SIZE:

SCHEMATIC NO. AND REVISION:

CUSTOMER NOTICE

THIS CIRCUIT IS PROPRIETARY TO ANALOG DEVICES AND

SUPPLIED FOR USE WITH ANALOG DEVICES PARTS.

www.analog.com

SKU NO.

IC NO.

ANALOG DEVICES 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 ANALOG DEVICES

APPLICATIONS ENGINEERING FOR ASSISTANCE.

1 1

M I

B L

DUAL 2A STEP-DOWN DC/DC MODULE REGULATOR

710-DC2910A_REV05

DC2910A

N/A

Tuesday, February 18, 2020

LTM4691EY

GND

R10

100k

E11

RUN2

C14

OPT

TPB1

MODE/

SYNC

OPT

0402

R11

VOUT2

1.8V / 2A

22uF

0603

6.3V

1.2pF

TPB2

22uF

0603

6.3V

C12

OPT

100k 1%

C15

OPT

0603

VIN

2.35V-3.6V

220uF

7343

C16

OPT

0603

R8 10k

JP2

OFF

RUN1

C13

OPT

PGOOD

100k

GND

TPA1

TPA2

JP1

BURST

FC/SYNC

PULSE SKIP

MODE/SYNC

100k 1%

10uF

0603

U1 LTM4691-LGA

PGOOD

VIN

VOUT2 E1

GND

FB2 A2

RUN2

GND

FB1 A3

RUN1

GND

MODE/SYNC

GND

AGND2

AGND1

VIN

GND

VOUT1 E4

VOUT1 F3

VOUT1 F4

VOUT2 F2

VOUT2 F1

R12

10M

E10

RUN1

GND

C10

OPT

0402

2.7pF

22uF

2012

140k

10uF

0603

JP3

OFF

RUN2

VOUT1

1.2V / 2A

C11

OPT

261k

VIN

PGOOD

RUN1

RUN2

FB1

VOUT1

FB2

MODE/SYNC

VOUT2

DEMO MANUAL DC2910A

Rev. 0

 ANALOG DEVICES, INC. 2020

02/20

www.analog.com

ESD Caution

ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection

circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.

Legal Terms and Conditions

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conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation

Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”)

and Analog Devices, Inc. (“ADI”), with its principal place of business at One Technology Way, Norwood, MA 02062, USA. Subject to the terms and conditions of the Agreement, ADI hereby grants to

Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and

agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted

is expressly made subject to the following additional limitations:Customer shall not (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board;and (ii) permit any Third

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NOT sold to Customer;all rights not expressly granted herein, including ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY. This Agreement and the Evaluation Board shall all

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use of the Evaluation Board or termination of this Agreement, Customer agrees to promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile

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