Analog Devices EVAL-LTM4702-AZ Quick setup guide

DEMO MANUAL

EVAL-LTM4702-AZ

Rev. 0

DESCRIPTION

LTM4702EY

16V, 8A Step-Down μModule

Regulator with Low Noise Reference

Evaluation board EVAL-LTM4702-AZ is a step-down

DC/DC switching converter featuring the LTM

4702

μModule

regulator. The evaluation board is designed to

deliver 8A maximum output current from a 4V to 16V

input. The LTM4702 employs Silent Switcher

architec-

ture with internal hot loop bypass capacitors to achieve

both low EMI and high efficiency. The LTM4702 contains

a current mode regulator IC, power inductor, and a modest

amount of input and output capacitance. A single resis-

tor(R3) sets the output voltage, providing unity gain oper-

ation over the output range, resulting in virtually constant

output noise independent of outputvoltage.

The EVAL-LTM4702-AZ evaluation board default switch-

ing frequency is 800kHz. An external resistor is placed

from RT pin to GND (R7) to set the switching frequency.

SYNC pin programs three different operating modes

(JP1 jumper):select PULSE for pulse-skipping mode

All registered trademarks and trademarks are the property of their respective owners.

BOARD PHOTO

with improved efficiency at light loads;select FCM for

forced continuous mode operation where fixed frequency

operation is more critical than low current efficiency and

where the lowest output ripple is desired;select SYNC to

synchronize to an external clock signal.

The RUN terminal can be used to set the LTM4702 in

shutdown mode. The power good output (PG) will be low

when the output voltage is outside of the ±7.5% regula-

tion window. When the power good feature is used, set

the PGSET resistor (R1) value according to the regulator

output voltage.

The LTM4702 data sheet gives a complete description of

the operation and application information. The data sheet

must be read in conjunction with this evaluation board.

Design files for this circuit board are available.

Part marking is either ink mark or laser mark

DEMO MANUAL

EVAL-LTM4702-AZ

Rev. 0

QUICK START PROCEDURE

Evaluation board EVAL-LTM4702-AZ is easy to set up to

evaluate the performance of the LTM4702. See Figure1

for the proper measurement equipment setup and follow

the procedure below.

With power off, connect the input power supply to V

(4V to 16V) and GND (input return).

2. Connect the 1V output load between VOUT and GND

(Initial load: no load).

Connect the DVMs to the input and output. Set default

jumper position:

JP1: FCM ON

JP2: 120 PS ON

PERFORMANCE SUMMARY

Specifications are at TA= 25°C

PARAMETER CONDITIONS MIN TYP MAX VALUE

Input Voltage Range 4 16 V

Output Voltage VIN = 4V to 16V, IOUT = 0A to 8A 1 ±2% V

Maximum Output Current VIN = 4V to 16V 8 A

Typical Switching Frequency 800 kHz

Typical Efficiency VIN = 12V, IOUT = 8A 80.5 %

Turn on the input power supply and check for the

proper output voltage. VOUT should be 1V ±2%.

5. Once the proper output voltage is established, adjust

the load within the operating range and observe

the output voltage regulation, efficiency, and

otherparameters.

NOTE: When measuring the output or input voltage rip-

ple, do not use the long ground lead on the oscilloscope

probe. See Figure2 for the proper scope probe technique.

Short, stiff leads may be soldered to the (+) and (–) ter-

minals 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

EVAL-LTM4702-AZ

Rev. 0

TYPICAL PERFORMANCE CHARACTERISTICS

Figure1. Proper Measurement Equipment Setup

Figure2. Measuring Output Ripple Voltage

+ –

VOUT GND

COUT

eval-ltm4702-az F02

AARRTTFFIILLMM--QQSSGG

DEMO MANUAL

EVAL-LTM4702-AZ

Rev. 0

TEST RESULTS

1.0V

OUT

AT 800kHz

1.5V

OUT

AT 1.2MHz

2.5V

OUT

AT 1.4MHz

3.3V

OUT

AT 1.7MHz

5.0V

OUT

AT 1.9MHz

LOAD CURRENT (A)

0.0

1.0

2.0

3.0

4.0

5.0

6.0

7.0

8.0

100

EFFICIENCY (%)

eval-ltm4702-az F03

Figure3. Efficiency vs Load Current, VIN = 12V

eval-ltm4702-az F04

2μs/DIV

VOUT

AC-COUPLED

10mV/DIV

eval-ltm4702-az F05

40μs/DIV

4A LOAD STEP

2A/DIV

IOUT: 4A TO/FROM 8A/DIV

VOUT

AC-COUPLED

20mV/DIV

Figure4. Output Voltage Ripple (12VIN, 1V, 8A Output) Figure5. Load Step Transient Test (VIN = 12V, VOUT = 1V)

Figure6. Thermal Image, VIN = 12V, 1V, 8A Output (No Heat Sink, No Forced Airflow)

DEMO MANUAL

EVAL-LTM4702-AZ

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP., ALUM POLY HYBRID, 100μF, 25V, 20%,

6.3mm × 7.7mm, AEC-Q200

PANASONIC, EEHZC1E101XP

2 1 C10 CAP. CER, 1μF, 25V, 10%, X7R, 0603, AEC-Q200 TDK, CGA3E1X7R1E105K080AC

3 2 C11, C12 CAP. CER, 22μF, 25V, 10%, X7R, 1210 MURATA, GRM32ER71E226KE15L

4 4 C13, C14, C15, C16 CAP. CER, 10μF, 6.3V, 20%, X7S, 0603 TDK, C1608X7S0J106M080AC

5 2 C6, C17 CAP. CER, 100μF, 10V, 20%, X5R, 1206, LOW ESR TDK, C3216X5R1A107M160AC

6 3 C18, C23, C24 CAP. CER, 0.1μF, 25V, 10%, X7R, 0603 SAMSUNG, CL10B104KA8NNNC

7 1 C19 CAP. CER, 2200pF, 16V, 10%, X7R, 0603 VISHAY, VJ0603Y222KXJCW1BC

8 1 C2 CAP. CER, 22μF, 25V, 20%, X5R, 0805, AEC-Q200 MURATA, GRT21BR61E226ME13L

9 2 C21, C22 CAP FEEDTHRU, 4.7μF, 10V, 20%, 0805, 3-TERMINAL MURATA, NFM21PC475B1A3D

10 3 C3, C4, C5 CAP. CER, 2.2μF, 25V, 10%, X5R, 0603 MURATAGRM188R61E225KA12D

11 1 C9 CAP. CER, 1μF, 10V, 10%, X7R, 0805 AVX, 0805ZC105KAT2A

12 1 FB1 IND., CHIP FERRITE BEAD, 0.015Ω, DCR, 5.1A WURTH ELEKTRONIK, 74279228600

13 1 L1 IND., POWER SHIELDED WIREWOUND, 0.0073Ω, DCR, 9.5A WURTH ELEKTRONIK, 744373240022

14 1 R1 RES., SMD, 49.9k, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ-3EKF4992V

15 1 R10 RES., SMD, 0Ω, 1%, 1/4W, 1206 VISHAYWSL, 120600000ZEA9

16 1 R12 RES., 1.2k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW06031K20FKEA

17 1 R13 RES., SMD, 0Ω, JUMPER, 1/10W, 0603, AEC-Q200,

PRECISION POWER

VISHAY, CRCW06030000Z0EA

18 2 R2, R5 RES., SMD, 100k, 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ-3EKF1003V

19 1 R3 RES., SMD, 10k 1%, 1/10W, 0603, AEC-Q200 PANASONIC, ERJ-3EKF1002V

20 1 R4 RES., SMD, 1Ω, 1%, 1/10W, 0603 YAGEO, RC0603FR-071RL

21 1 R7 RES., 137k, 1%, 1/10W, 0603, AEC-Q200 VISHAY, CRCW0603137KFKEA

22 1 U1 IC-ADI, 18VIN, 8A, Silent Switcher, μModule REGULATOR ANALOG DEVICES, LTM4702EY#PBF

Additional Demo Board Circuit Components

18 0 C7, C8, C20, C25 OPTIONAL CAPACITOR

19 0 R6, R8, R9, R11 OPTIONAL RESISTOR

20 0 L2 OPTIONAL INDUCTOR

Hardware: For Demo Board Only

24 2 J1, J2 CONN., PCB, SMA, FEMALE JACK, RCP, 50Ω MOLEX, 732511350

26 2 JP1, JP2 CONN., HDR, MALE, 2 × 3, 2mm, VERT, ST, THT WURTH ELEKTRONIK, 62000621121

27 4 STANDOFF, BRD, SPT, SNAP-FIT, 9.53mm LENGTH,

EVAL BOARD MTG

KEYSTONE, 8832

28 2 CONN., SHUNT, FEMALE, 2-POS, 2mm KEYSTONE, 8831

29 1 PCBs FAB PRINTED CIRCUIT BOARD WURTH ELEKTRONIK, 702931000

DEMO MANUAL

EVAL-LTM4702-AZ

Rev. 0

SCHEMATIC DIAGRAM

VOUT

OPT 0603

0805

DGND_A CONNECTED TO GROUND

AT C3 ON PRIMARY SIDE

SYNC

SHUNTS FOR JP1,JP2

INSTALLED IN POSITION B

120 PS

GND

1206

VIN SENSE

CLK OUT

GND

OPT 0603

1210

VEMI

LTM4702EY

RUN

GND

1210

SENSE GND

OPT 0603

1V/8A

02-23-23PRODUCTION ZCB

4V-16V

VIN

4V-16V

VO SENSE

0805

TSENSE+

SENSE GND

SYNC

180 PS

PH MODE

SYNC

PULSE

90 PS

FCM

1206

OPT 0603

TSENSE-

OPT 0603

OPT

PANASONIC

DGND-AGND CONNECTED TOGETHER ON LAYER 3

C16 ON PRIMARY SIDE

DGND_B CONNECTED TO GROUND AT

OPT 0603

16V,8A uMODULE REGULATOR with LOW NOISE REFERENCE

HW TYPE : Customer Evaluation

Product(s): LTM4702-AZ

<DESIGN_VIEW>

1 1

1:1

02_065996

49.9K

R10

S2751-46R

E12

DNI

R11

10UF

744373240022

6.3V

S2751-46R

CLKOUT

S2751-46R

VOUT

S2751-46R

74279228600

VEMI

C12

1UF

E17

25V

C10

C22

NFM21PC475B1A3D

100UF

6.3V

732511350

62000621121

C11

22UF

25V

FB1

DNI

4.7UF

25V

22UF

25V

0.1UF

2.2UF

DNI

E4 2200PF

137K

INTVCC

S2751-46R

PHMODE

COMPB

SET

TSENSE+

TSENSE-

62000621121

5019

25V 10V

100UF25V

2.2UF

10UF

6.3V

VOUT

100K

NFM21PC475B1A3D

DUTVOUT

25V

10UF

VOUT 5019

6.3V

10UF

4.7UF

25V

22UF

0.22UH

0.1UF

EEHZC1E101XP

100UF

SYNC

VIN

RUN

SVN

VIN

INTVCC

100K

5019

COMPA

10K

2.2UF

25V

S2751-46R

732511350

0.1UF

VOSNS

PGSET

25V

5019

S2751-46R

1UF

S2751-46R

10V

DNI

1.2K

DNI

25V

C20

C18

E10

E13

E14

E15

2345

R4R5

C23

E11

1 2

E16

C17

C24

G1 G2

C21

G1 G2

1 3

R13

C19

C25

R12

C14C13

C15 C16

JP2

1 2

3 4

5 6

JP1

1 2

3 4

5 6

THIS DRAWING IS THE PROPERTY OF ANALOG DEVICES INC.

IN PART, OR USED IN FURNISHING INFORMATION TO OTHERS,

OR FOR ANY OTHER PURPOSE DETRIMENTAL TO THE INTERESTS

THE EQUIPMENT SHOWN HEREON MAY BE PROTECTED BY PATENTS

IT IS NOT TO BE REPRODUCED OR COPIED, IN WHOLE OR

DRAWING NO.

SCALE

SIZE

REV

SHEET

APPROVED

DESCRIPTION

REVISIONS

OL G

OWNED OR CONTROLLED BY OWNED ANALOG DEVICES.

OF ANALOG DEVICES.

SCHEMATIC

PTD ENGINEER

DESIGN VIEW

REV DATE

PHMODE

GND

SYNC

GND

VOUT

CLKOUT

GND

VOUT

VOSNS

GND

PGSET

SET

GND

INTVCC

AGND

GND

COMPB

COMPA

RUN

VIN

GND

VOUT

TSENSE-

TSENSE+

VIN

SVIN

VOUT

DGND_A

DGND_B

OUTIN

DEMO MANUAL

EVAL-LTM4702-AZ

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.

REV DATE DESCRIPTION PAGE NUMBER

0 04/23 Initial Release —

REVISION HISTORY

DEMO MANUAL

EVAL-LTM4702-AZ

Rev. 0

 ANALOG DEVICES, INC. 2023

04/23

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

By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and

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

Party to access the Evaluation Board. As used herein, the term “Third Party”includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is

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

be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of

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

or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited

to soldering or any other activity that affects the material content of the Evaluation Board. Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS

Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF

LIABILITY. THE EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS”AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY

DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE

IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR NONINFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS

LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDING

BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF ONE

HUNDRED US DOLLARS ($100.00). EXPORT. Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable United States

federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of Massachusetts

(excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits

to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.

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