Analog Devices DC2779A Guide de configuration rapide

DEMO MANUAL DC2779A

Rev. 0

DESCRIPTION

LT8644S

8V, 16A Synchronous Step-Down

Silent Switcher 2

Demonstration circuit 2779A is an 8V, 16A synchronous

step-down Silent Switcher

2 with spread spectrum fre-

quency modulation featuring the LT

8644S. The demo

board is designed for 1.2V output from a 2.7V to 8V input.

The LT8644S is a compact, ultralow emission, high effi-

ciency, and high speed synchronous monolithic step-

down switching regulator. The integrated bypass capaci-

tors optimize all the fast current loops and make it easier

to minimize EMI emissions by reducing layout sensitivity.

Selectable spread spectrum mode further improves EMI

performance, making it perfect solution to the noise sen-

sitive applications.

Peak current mode control with minimum on-time of as

low as 20ns allows high step-down conversion even at

high frequency. The LT8644S switching frequency can be

programmed either via an external resistor or an external

clock over a 300kHz to 3.5MHz range. The default fre-

quency of demo circuit 2779A is 2MHz.

The SYNC/MODE pin on the demo board DC2779A is

grounded (JP1 at BURST position) by default for low

ripple Burst Mode

operation. It can be configured into

different operation modes through JP1 and SYNC termi-

nal (Table1).

Table1. Operation Mode Configuration

JP1 Position SYNC (E5) Input Operation Mode

SPREAD-SPECTRUM

N/A Forced Continuous Mode with

Spread-Spectrum

BURST N/A Low Ripple Burst Mode

FCM/SYNC Floating Forced Continuous Mode

without Spread-Spectrum

FCM/SYNC External Clock Forced Continuous Mode with

Synchronization

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

Figure4 shows the efficiency of the circuit at 3.3V input

and 5V input in force continuous mode operation (input

from VIN terminal). To get accurate efficiency measure-

ment, measure the input voltage at the VIN_SENSE/GND

terminals and measure the output voltage at the VOUT+

SENSE/VOUT–SENSE terminals. Figure 5 shows the

LT8644S temperature rise on DC2779A demo board at

3.3V input and 5V input in forced continuous mode.

The LT8644S is assembled in a 4mm × 4mm LQFN pack-

age with exposed pads for low thermal resistance. The

rated maximum continuous load current is 16A, while

derating may be necessary for certain input voltage and

thermal conditions.

The demo board has an EMI filter installed. This EMI

filter can be included by applying the input voltage at

the VEMI terminal. The EMI performance of the board

(with EMI filter) is shown on Figure6. The red lines in

EMI Performance are CISPR25 Class 5 limits. The figure

shows that the LT8644S circuit passes the test with a

wide margin. To achieve EMI performance as shown in

Figure6, the input EMI filter is required and the input

voltage should be applied to VEMI terminal, and the test

setup can be referred to the CISPR25 standards. If the

input is applied to VIN terminal, the EMI filter is bypassed.

The LT8644S data sheet gives a complete description of

the part, the operation and application information. The

data sheet must be read in conjunction with this demo

manual for demo circuit 2779A. The layout recommen-

dations for low EMI operation and maximum thermal

performance are available in the data sheet section Low

EMI PCB Layout and Thermal Considerations. Contact ADI

applications engineer for support.

Design files for this circuit board are available.

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DEMO MANUAL DC2779A

Rev. 0

QUICK START PROCEDURE

Demonstration circuit 2779A is easy to set up to evalu-

ate the performance of the LT8644S. Refer to Figure1

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 output capacitor.

See Figure2 for the proper scope technique.

1. Make sure the Jump JP1 is on the BURST position.

Refer to the schematic.

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

and GND. If the input EMI ﬁlter is desired, connect the

input power supply to VEMI and GND.

3. Withpoweroff,connecttheloadfromVOUT+toVOUT–.

4. Connect the voltage meter across the VIN_SENSE and

GND for VIN measurement, and VOUT+ SENSE and

VOUT– SENSE for VOUT measurement.

5. Turn on the power at the input.

NOTE:Make sure that the input voltage does not exceed 8V.

6. Check for the proper output voltage (VOUT = 1.2V).

NOTE: If there is no output, temporarily disconnect the

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

shorted.

7. Once the proper output voltage is established, adjust

the load within the operating ranges and observe the

outputvoltageregulation,ripplevoltage,efﬁciency,and

other parameters.

8. An external clock can be added to the SYNC terminal

when SYNC function is used (JP1 on the FCM/SYNC

position). Please make sure that R2 should be chose

to set the LT8644S switching frequency equal to or

below the lowest SYNC frequency. When JP1 is in FCM/

SYNC position and no external clock is connected to

the SYNC terminal of the board, the SYNC/MODE pin

is ﬂoating and the LT8644S runs in forced continuous

mode. JP1 can also set LT8644S in spread spectrum

mode (JP1 on the SPREAD-SPECTRUM position).

9. To test the transient response, connect a signal

generator to PULSE GEN terminal, and add a desired

base load between VOUT+ and VOUT– (LOAD shown

on Figure1). Adjust the signal generator with a 2ms

period, 5% duty cycle and an amplitude from 1V to 2V

to start. Measure the LOAD STEP voltage to observe

thecurrent(ILOADSTEP =VLOAD_STEP/10mΩ).Adjustthe

amplitude of the pulse to provide the desired transient.

Adjust the rising and falling edge of the pulse to provide

the desired ramp rate. Figure3 shows a load step from

4A to 12A. The 4A base load is added between VOUT+

and VOUT–, while the 8A step load is controlled by

the signal generator at PULSE_GEN and measured at

LOAD_STEP with 0.01V/A ratio.

PERFORMANCE SUMMARY

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Supply Range 2.7 8 V

VOUT Output Voltage VIN = 5V 1.18 1.2 1.22 V

IOUT Maximum Continuous Output Current 16 A

fSW Switching Frequency 1.95 2 2.05 MHz

EFF Efficiency VIN = 5V, VOUT = 1.2V, IOUT = 8A 90.2 %

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DEMO MANUAL DC2779A

Rev. 0

QUICK START PROCEDURE

Figure1. Proper Measurement Equipment Setup

Figure3. LT8644S Demo Circuit DC2779A Transient Response (VIN = 5V, 4A to 12A Load Step)

20µs/DIV

LOAD_STEP

5A/DIV

OUT

50mV/DIV

PULSE_GEN

2V/DIV

DC2779A F03

Figure2. Measuring Output Ripple at Output Capacitor C9

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DEMO MANUAL DC2779A

Rev. 0

QUICK START PROCEDURE

Figure4. LT8644S Demo Circuit DC2779A Efficiency vs Load Current

Figure5. LT8644S Demo Circuit DC2779A Case Temperature Rise vs Load Current

POWER LOSS

EFFICIENCY

= 3.3V

= 5V

LOAD CURRENT (A)

100

0.5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

EFFICIENCY (%)

POWER LOSS (W)

DC2779A F01

FORCED CONTINUOUS MODE

L = XEL5030, 0.13µH

OUT

= 1.2V, f

= 2MHz

FORCED CONTINUOUS MODE

= 3.3V

= 5V

LOAD CURRENT (A)

CASE TEMPERATURE RISE (°C)

DC2779A F02

ROOM CONDITION

STILL AIR

L = XEL5030, 0.13µH

OUT

= 1.2V, f

= 2MHz

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DEMO MANUAL DC2779A

Rev. 0

QUICK START PROCEDURE

Figure6. LT8644S Demo Circuit DC2779A EMI Performance

Conducted EMI Performance

(CISPR25 Conducted Emission Test with Class 5 Peak Limits)

Radiated EMI Performance

(CISPR25 Radiated Emission Test with Class 5 Peak Limits)

VOLTAGE METHOD

CLASS 5 PEAK LIMIT

SPREAD SPECTRUM MODE

FIXED FREQEUNCY MODE

FREQUENCY (MHz)

–20

–10

AMPLITUDE (dBµV)

DC2779A F03a

VERTICAL POLARIZATION

PEAK DETECTOR

CLASS 5 PEAK LIMIT

SPREAD SPECTRUM MODE

FIXED FREQUENCY MODE

FREQUENCY (MHz)

100

200

300

400

500

600

700

800

900

1000

–5

AMPLITUDE (dBµV/m)

DC2779A F03b

DC2779A DEMO BOARD

(WITH EMI FILTER INSTALLED)

5V INPUT TO 1.2V OUTPUT AT 16A, f

= 2MHz

HORIZONTAL POLARIZATION

PEAK DETECTOR

CLASS 5 PEAK LIMIT

SPREAD SPECTRUM MODE

FIXED FREQUENCY MODE

FREQUENCY (MHz)

100

200

300

400

500

600

700

800

900

1000

–5

AMPLITUDE (dBµV/m)

DC2779A F03c

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DEMO MANUAL DC2779A

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 C2, C12 CAP., 10µF, X5R, 16V, 10%, 0603 MURATA, GRM188R61C106KAALD

2 1 C5 CAP., 390pF, C0G/NP0, 50V, 5%, 0603 AVX, 06035A391JAT2A

3 2 C6, C19 CAP., 220µF, X5R, 4V, 20%, 1206 MURATA, GRM31CR60G227ME11L

4 1 C8 CAP., 0.1µF, X7R, 16V, 10%, 0603 AVX, 0603YC104KAT2A

5 2 C9, C20 CAP., 22µF, X5R, 4V, 20%, 0603 MURATA, GRM188R60G226MEA0D

6 1 C16 CAP., 33pF, C0G, 50V, 5%, 0603 AVX, 06035A330JAT2A

7 2 C17, C26 CAP., 22µF, X7R, 10V, 10%, 1206 MURATA, GRM31CR71A226KE15L

8 1 C21 CAP., 1µF, X7R, 16V, 10%, 0603 AVX, 0603YC105KAT2A

9 1 L1 IND., 0.13µH, PWR, 20%, 35A, 1.83mΩ, 5.48mm × 5.28mm COILCRAFT, XEL5030-131MEB

10 4 R1, R3, R5, R7 RES., 100k, 1%, 1/10W, 0603 VISHAY, CRCW0603100KFKEA

11 1 R2 RES., 16.9k, 1%, 1/10W, 0603 VISHAY, CRCW060316K9FKEA

12 1 R4 RES., 13.3k, 1%, 1/10W, 0603 VISHAY, CRCW060313K3FKEAC

13 1 R8 RES., 1Ω, 1%, 1/10W, 0603 VISHAY, CRCW06031R00FKEA

14 1 U1 IC, STEP-DOWN SWITCHER, LQFN-24 (4mm × 4mm) ANALOG DEVICES., LT8644SIV#TRMPBF

Additional Demo Board Circuit Components

1 1 C1 CAP., 100µF, ALUM. ELECT., 16V, 20%, 6.3mm × 5.4mm SUN ELECTRONIC INDUSTRIES CORP, 16CE100BS

2 2 C3, C10 CAP., 22µF, X7R, 10V, 10%, 1206 MURATA, GRM31CR71A226KE15L

3 0 C7, C15, C23 (OPT) CAP., OPTION, 0603

4 1 C14 CAP., 1µF, X5R, 25V, 10%, 0402 MURATA, GRM155R61E105KA12D

5 0 C22 (OPT) CAP., OPTION, 0805

6 0 C24 (OPT) CAP., OPTION, 1206

7 1 C25 CAP., 4.7µF, X7S, 10V, 10%, 0603 MURATA, GRM188C71A475KE11D

8 1 FB1 IND., 10Ω AT 100MHz, FERRITE BEAD, 25%, 10.5A, 3mΩ, 1206 WURTH ELEKTRONIK, 74279221100

9 0 L2 (OPT) IND., OPTION

10 1 Q1 XSTR., MOSFET, N-CH, 40V, 14A, DPAK (TO-252) VISHAY, SUD50N04-8M8P-4GE3

11 0 R6, R11 (OPT) RES., OPTION, 0603

12 1 R9 RES., 0.01Ω, 1%, 1W, 2512, PWR, METAL, SENSE VISHAY, WSL2512R0100FEA

13 1 R10 RES., 10k, 1%, 1/10W, 0603 VISHAY, CRCW060310K0FKEA

14 1 R12 RES., 0Ω, 1/10W, 0603 VISHAY, CRCW06030000Z0EA

Hardware: For Demo Board Only

1 12 E1, E2, E5-E9, E11,

E15-E18

TEST POINT, TURRET, 0.094" MTG. HOLE, PCB 0.062" THICK MILL-MAX, 2501-2-00-80-00-00-07-0

2 4 E3, E10, E12, E13 TEST POINT, TURRET, 0.064" MTG. HOLE, PCB 0.062" THICK MILL-MAX, 2308-2-00-80-00-00-07-0

3 2 JP1, JP2 CONN., HDR, MALE, 2x3, 2mm, VERT, STR, THT WURTH ELEKTRONIK, 62000621121

4 4 J1-J4 CONN., BANANA JACK, FEMALE, THT, NON-INSULATED,

SWAGE, 0.218"

KEYSTONE, 575-4

5 4 MP1-MP4 STANDOFF, NYLON, SNAP-ON, 0.50" WURTH ELEKTRONIK, 702935000

6 2 XJP1, XJP2 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421

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DEMO MANUAL DC2779A

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

ALL CAPACITORS ARE 0603.

NOTES: UNLESS OTHERWISE SPECIFIED

1. ALL RESISTORS ARE 0603.

FCM/SYNC

BURST

SPREAD-SPECTRUM

120

180

PHMODE

OPTIONAL TRANSIENT RESPONSE CIRCUIT

VOUT

DATE:

SHEET OF

TITLE: SCHEMATIC

APPROVALS

PCB DES.

APP ENG.

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.

NAME

LT8644S

8V, 16A SYNCHRONOUS

DC2779A

710-DC2779A_REV03

N/A

STEP-DOWN SILENT SWITCHER 2

Thursday, May 20, 2021

DATE:

SHEET OF

TITLE: SCHEMATIC

APPROVALS

PCB DES.

APP ENG.

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.

NAME

LT8644S

8V, 16A SYNCHRONOUS

DC2779A

710-DC2779A_REV03

N/A

STEP-DOWN SILENT SWITCHER 2

Thursday, May 20, 2021

DATE:

SHEET OF

TITLE: SCHEMATIC

APPROVALS

PCB DES.

APP ENG.

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.

NAME

LT8644S

8V, 16A SYNCHRONOUS

DC2779A

710-DC2779A_REV03

N/A

STEP-DOWN SILENT SWITCHER 2

Thursday, May 20, 2021

C25

4.7uF

10V

C26

22uF

10V

1206

E11

JP1

1 2

3 4

5 6

0.01

2512

GND

SUD50N04-8m8P

E16

OPT

IHLP1616

SVIN

C17

22uF

10V

1206

E17 LOAD_STEP

OPT

C22

TBD

0805

LT8644S

EN 17

SYNC

VCC_INT

FB 24

PG 23

PHSMD 1

BST 7

AGND

GND

PVIN

CLKOUT 19

SW 8

SW 9

SW 10

SW 11

SW 12

GND

SVIN

PVIN

10uF

16V

OPT

FB1

74279221100

22uF

R12 0

0.13uH

XEL5030-131MEB

1 2

E15

GND

C14

1uF

0402

25V

E8 PG

SYNC

C24

OPT

100k

100uF

16CE100BS

16V

VIN

2.7V - 8V

C12

10uF

16V

390pF

220uF

1206

C19

220uF

1206

R11

OPT

E2 GND

22uF

10V

1206

VOUT+

1.2V / 16A

C20

22uF

VEMI

C21

1uF

C16

33pF

J4 VOUT-

C10

22uF

10V

1206

E10

VIN_SENSE

C15

OPT

0.1uF

100k

JP2

1 2

3 4

5 6

100k

E6 CLKOUT

E12 VOUT+ SENSE

R10

10k

GND

C23

OPT

E18 PULSE_GEN

16.9k

13.3k

E13 VOUT- SENSE

VCC

VIN

VCC

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DEMO MANUAL DC2779A

Rev. 0

 ANALOG DEVICES, INC. 2021

10/21

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.

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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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