Analog Devices DC2745A Guida rapida alla configurazione

DEMO MANUAL DC2745A

Rev. 0

DESCRIPTION

LTC3309A

5V, 6A Synchronous Step-Down

Silent Switcher in 2mm × 2mm LQFN

Demonstration Circuit 2745A features the LTC

3309A 5V,

6A synchronous step-down silent switcher operating as

a 2MHz, 3.3V to 1.2V 6A buck regulator. The LTC3309A

supports adjustable output voltages from 0.5V to VIN,

and operating frequencies from 1MHz up to 3MHz. The

LTC3309A is a compact, ultralow emission, high effi-

ciency, and high speed synchronous monolithic step-

down switching regulator. A minimum on-time of 22ns

enables high V

to low V

OUT

conversion ratios at high

switching frequencies.

The DC2745A operating mode may be selected as

Burst Mode

operation, skip or forced continuous (FC)

mode. Setting JP1 to the FC/SYNC position will allow

the LTC3309A to sync to a clock frequency from 1MHz

to 3MHz. The LTC3309A operates in forced continuous

mode when syncing to an external clock.

The DC2745A is set to a fixed 2MHz frequency by con-

necting RT to V

through a 0Ω resistor, R9. The frequency

can be easily changed by removing R9 and setting an

appropriate resistor in the R4 location to obtain the

desired frequency. Refer to the LTC3309A data sheet for

the proper RT value for a desired switching frequency.

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

PERFORMANCE SUMMARY

The DC2745A also has an EMI filter to reduce conducted

EMI. This EMI filter can be included by applying the input

voltage at the VIN EMI terminal. The EMI performance of

the board is shown in the EMI Test Results section. The

red lines in the EMI performance graphs illustrate the

CISPR25 Class 5 peak limits for the conducted and radi-

ated emission tests.

The LTC3309A data sheet gives a complete description

of the device, operation and application information. The

data sheet must be read in conjunction with this demo

manual. The LTC3309A is assembled in a 2mm × 2mm

LQFN package with exposed pads for low thermal resis-

tance. The layout recommendations for low EMI operation

and maximum thermal performance are available in the

data sheet section Low EMI PCB Layout.

The Efficiency vs Load graph shows the efficiency and

the power loss of the circuit with a 3.3V input in Burst

Mode operation.

Design files for this circuit board are available.

Specifications are at TA= 25°C

SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS

VIN Input Voltage Range 2.25 5.5 V

VOUT VOUT Voltage Range* 1.183 1.2 1.217 V

IOUT OUTPUT Current 6 A

fSW Switching Frequency VIN Greater than VOUT 1 3 MHz

tON Top Switch Minimum On Time 22 ns

Duty Cycle Top Switch Duty Cycle 100 %

*With 1% resistors. Accuracy will improve to within 1% using 0.1% FB resistors.

DEMO MANUAL DC2745A

Rev. 0

CIRCUIT SCHEMATIC

BOARD PHOTO

1µF

0201

10nF

dc2745a T01a

EN SW

VIN

PGND

140k6.8pF

10µF

220nH

100k

47µF

OUT

1.2V

= 2.25V TO 5.5V

AGND

PGOOD

LTC3309A

1µF

0201

MODE/SYNC

OSC

= 2MHz

High Efficiency, 2MHz, 1.2V 6A Step-Down Converter LTC3309A 3.3V to 1.2V Efficiency and

Powerloss DC2745A in Burst Mode

= 3.3V

OUT

= 1.2V

= 2MHz

EFFICIENCY

POWER LOSS

XFRMS INC. XFHCL43LT–R22

LOAD CURRENT (mA)

0.001

0.01

0.1

100

0.0001

0.001

0.01

0.1

EFFICIENCY (%)

POWER LOSS (W)

DC2745A TA01b

DEMO MANUAL DC2745A

Rev. 0

EMI TEST RESULTS

CISPR25 Conducted Emisions with Class 5 Peak Limits (Voltage Method)

Radiated EMI Performance (CISPR25 Radiated

Emisions Test with Class 5 Peak Limits)

Radiated EMI Performance (CISPR25 Radiated

Emisions Test with Class 5 Peak Limits)

FREQUENCY (MHz)

AMPLITUDE (dBµV/m)

–20

–10

dc2745a G01

0 50 9030 70

110

10040 8020 6010

PEAK LIMIT

PEAK

DC2745A DEMO BOARD

(WITH EMI FILTER INSTALLED)

3.3V INPUT TO 1.2V OUTPUT AT 4.8A, fSW = 2MHz

FREQUENCY (MHz)

AMPLITUDE (dBµV/m)

dc2745a G02

0 500 900300 700

1000

400 800200 600100

HORIZONTAL POLARIZATION

PEAK DETECTOR

PEAK LIMIT

PEAK

DC2629A DEMO BOARD

(WITH EMI FILTER INSTALLED)

3.3V INPUT TO 1.2V OUTPUT AT 4.8A, f

= 2MHz

FREQUENCY (MHz)

AMPLITUDE (dBµV/m)

dc2745a G03

0 500 900300 700

1000

400 800200 600100

VERTICAL POLARIZATION

PEAK DETECTOR

PEAK LIMIT

PEAK

DC2745A DEMO BOARD

(WITH EMI FILTER INSTALLED)

3.3V INPUT TO 1.2V OUTPUT AT 4.8A, f

= 2MHz

Load Transient Response Forced Continuous Mode

3.3V

IN TO 1.2V

OUT

LOADSTEP 1.2A TO 4.8A 1A/µs

20µs/DIV

SG_INPUT

2V/DIV

OUT

50mV/DIV

RSNS

200mV/DIV

dc2745a G04

LTC3309A Load Regulation

VIN = 3.3V

VOUT = 1.2V

FORCED CONTINUOUS MODE

IOUT (A)

0.0

1.0

2.0

3.0

4.0

5.0

6.0

1.190

1.192

1.194

1.196

1.198

1.200

1.202

1.204

1.206

1.208

1.210

VOUT (V)

dc2745a G05

DEMO MANUAL DC2745A

Rev. 0

QUICK START PROCEDURE

Demonstration circuit 2745A is easy to set up and use

to evaluate the performance of the LTC3309A. Refer to

Figure1 for proper measurement equipment setup and

follow the procedure below:

NOTE:For accurate V

, V

OUT

and efficiency measure-

ments, measure VIN at the VIN SNSE and GND SNSE tur-

rets and V

OUT

at the V

OUT

SNSE and GND SNSE turrets as

illustrated as VM1 and VM2 in Figure1. When measuring

the input or output voltage ripple, care must be taken to

avoid a long ground lead on the oscilloscope probe.

1. Set the JP1 Jumper to the SKIP position and JP2 to

the HI position.

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 VIN EMI.

3. Slowly increase PS1 to 1.0V. If AM1 reads less than

20ma, increase PS1 to 3.3V. Verify that VM1 reads

3.3V and VM2 reads 1.2V.

4. Connect an oscilloscope voltage probe as shown

in Figure2 in parallel with VM2. Set Channel to AC

coupled, voltage scale to 20mV and time base to 10µs.

Observe the VOUT ripple voltage.

NOTE: Measure the output voltage ripple by touching the

probe tip directly across the output turrets or to TP1 as

shown in Figure2. TP1 is designed for a 50Ω coax cable

to reduce any high frequency noise that might couple into

the oscilloscope probes.

5. Verify that PGOOD turret is high.

6. Increasing the load by 1A intervals up to 6A and record

VM1, VM2, AM1 and AM2 for each interval.

7. Repeat step 6 for PS1 set to 2.5V and again for PS1

set to 5.0V.

8. Settheloadtoa constant 3A.Remove the oscilloscope

voltage probe from VOUT. Place a ground clip on PGND

terminal and set the voltage scale to 1V and the time

scale to 500ns/Division. Trigger on the rising edge of

the voltage probe. Using a tip on the voltage probe,

contact the SW node on the pad of L1. Observe the

duty cycle and the period of the switching waveform

(~500nanoseconds).

9. Set the load current to 0.5A and repeat step 8. Observe

that the switching waveform is now operating in Pulse

Skip Mode.

10. Move the jumper on JP2 to LO. Verify that VOUT reads

0V and verify that PGOOD is low. Return jumper on

JP2 to HI and verify VM2 is 1.2V and verify PGOOD2

is high.

11. If forced continuous or Burst Mode is desired, set

PS1 to 0V. Move JP1 to FC/SYNC or BURST. Repeat

steps 3 through 9. In step 9 observe that the switch-

ing waveform is now operating in forced continuous

or Burst Mode.

12. To change the frequency, remove R9 if installed.

Install the desired RT resistor in the R4 location. Size

the inductor and output capacitors to provide the

desired inductor ripple and a stable output. Refer to

the LTC3309A data sheet and LTPowerCAD for more

information on choosing the required components.

13. To test the transient response with a base load, add

the desired resistor to produce a minimum load be-

tween VOUT and RSNS turrets (RL shown on Figure1).

Note that the total load resistance will be RL plus R11

(100mΩ).

14. Adjust a signal generator with a 10ms period, 10%

duty cycle and an amplitude from 1V to 2V to start.

15. Measure the RSNS voltage to observe the current,

VRSNS/100mΩ. Adjust the amplitude of the pulse to

provide the desired transient. Adjust the rising and

falling edge of the pulse to provide the desired ramp

rate. Refer to the following equations and the optional

transient response circuit shown in Figure 3:

IOUT = VRSNS/100mΩ (2)

where

VRSNS = VSG_INPUT − VGS (3)

16. When done, turn off PS1 and Load. Remove all con-

nections to demo board.

DEMO MANUAL DC2745A

Rev. 0

QUICK START PROCEDURE

Figure1. Test Setup for the DC2745A Demo Board

DEMO MANUAL DC2745A

Rev. 0

QUICK START PROCEDURE

TP1

VOUT

OUT

1 2 3

6 7 8

SIR426DP-T1-GE3

R10

10k

R11

0.1k

2512

SG_INPUT

20V MAX

E19

E20 RSNS

DC2745A F03

TP2

ISTEP

Figure3. Optional Transient Response Circuit

Figure2. Technique for Measuring Output Ripple and Step Response

a) With a Scope Probe.

b) With a Low Inductance Connector (Not Supplied).

DEMO MANUAL DC2745A

Rev. 0

THEORY OF OPERATION

Introduction to the DC2745A

The DC2745A demonstration circuit features the

LTC3309A, a low voltage synchronous step-down silent

switcher. The LTC3309A is a monolithic, constant fre-

quency, current mode step-down DC/DC converter. An

oscillator, with frequency set using a resistor on the RT

pin, turns on the internal top power switch at the begin-

ning of each clock cycle. Current in the inductor then

increases until the top switch comparator trips and turns

off the top power switch. If the EN pin is low, the LT3309A

is in shutdown and in a low quiescent current state. When

the EN pin is above its threshold, the switching regulator

will be enabled.

The MODE/SYNC pin sets the switching mode to pulse

skip, forced continuous, or Burst Mode. If an external

1MHz to 3MHz clock is connected to the MODE/SYNC

turret while the JP1 is set to the FC/SYNC position, the

LTC3309A switching frequency will sync to the external

clock while operating in forced continuous mode. See

the LTC3309A data sheet for more detailed information.

The maximum allowable operating frequency is influenced

by the minimum on time of the top switch, the ratio of

OUT

to V

. The maximum allowable operating frequency

may be calculated using a minimum tON of 42ns in the

formula below.

fSW(MAX) =VOUT

VIN(MAX) • tON(MIN)

Select an operating switching frequency below fSW(MAX).

The recommended ripple current in the output inductor is

1.8A peak-to-peak for the LTC3309A. This determines the

recommended inductor value for the application.

Accurately Measuring Output Ripple of the LTC3309A

With the fast edge rates of the circuit, high frequency

noise can be observed when measuring the output volt-

age with 1MΩ terminated oscilloscope probes. To bet-

ter view the output ripple with oscilloscopes of 400MHz

bandwidth and above a 50Ω coax cable connected as

close to the output caps as possible should be used with

the oscilloscope channel terminated to 50Ω at the scope.

This will help to reduce the noise coupling onto and dis-

playing on the scope. The demo board is set up to solder

an U.FL, RECEPT, ST SMD, 0Hz to 6GHz 50Ω connector

(TP1) near the output cap C4. These pads can also be

used to solder a coax cable or other oscilloscope probe

connector if desired.

The high frequency spikes are partially attributed to the

inter-winding capacitance of the inductor and the voltage

step is partially attributed to the inductance in the output

capacitors. This can be reduced by choosing low ESL

capacitors or adding small low ESL capacitors in parallel

to the output capacitors as close to the inductor as pos-

sible. Adding capacitors close to the load creates a π filter

between the output caps, trace inductance, and load decou-

pling caps and will also help to reduce the ripple. Below is

the output ripple using a 500MHz scope, 50Ω probe with

C4 and C5 reduced to 22µF 0603 caps. The capacitors near

the VOUT turret on the bottom of the board were also popu-

lated with C17 = 1µF 0402, plus C18 and C19 = 10µF 0603

capacitors. The output ripple was measured at TP3 on the

bottom of the board near the VOUT turrets.

500ns/DIV

10mV/DIV 29mV

dc2745a G06

VIN = 3.3V

VOUT = 1.2V

OUT

= 6A

500ns/DIV dc2745a G07

VIN = 3.3V

VOUT = 1.2V

IOUT = 6A

C4, C5 = 22µF 0603

C17 = 1µF 0402

C18, C19 = 10µF 0603

10mV/DIV 9mV

DEMO MANUAL DC2745A

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP., 0.01µF, X7R, 10V, 10%, 0201 MURATA, GRM033R70J103KA01D

2 2 C2, C3 CAP., 10µF, X7S, 6.3V, 20%, 0603 TDK, C1608X7S0J106M080AC

3 2 C4, C5 CAP., 47µF, X6S, 6.3V, 20%, 0805 TAIYO YUDEN, JMK212BC6476MG-T

4 1 C6 CAP., 6.8pF, C0G/NP0, 50V, ±0.5pF, 0402 AVX, 04025A6R8DAT2A

5 2 C15, C16 CAP., 1µF, X7T, 6.3V, 20%, 0201 MURATA, GRM033D70J105ME01D

6 1 L1 IND., 0.22µH, PWR, SHIELDED, 20%, 8A, 13mΩ,

2.5mmx2.0mm, SMD

XFMRS, INC., XFHCL43LT- R22M

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

8 1 R2 RES., 100k, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402100KFKED

9 1 U1 IC, 6A LOW VOLTAGE MONOLITHIC SYNC, LQFN-12(2x2) LINEAR TECH., LTC3309AEV#PBF

Additional Demo Board Circuit Components

1 2 C7, C8 CAP., 330µF, TANT. POSCAP, 6.3V, 20%, 7343, 25mΩ, TPE PANASONIC, 6TPE330ML

2 1 C9 CAP., 0.1µF, X7R, 25V, 10%, 0402, AEC-Q200 MURATA, GCM155R71E104KE02D

3 2 C10, C11 CAP., 10µF, X7S, 6.3V, 20%, 0603 TDK, C1608X7S0J106M080AC

4 2 C13, C14 CAP., 1µF, X7T, 6.3V, 20%, 0201 MURATA, GRM033D70J105ME01D

5 1 L2 IND., 100Ω @ 100MHz, FERRITE BEAD, 25%, 8A, 6mΩ,

1812

WURTH ELEKTRONIK, 74279226101

6 1 Q1 XSTR., MOSFET, N-CH, 40V, 30A, PPAK SO-8 VISHAY, SIR426DP-T1-GE3

7 1 R3 RES., 20Ω, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040220R0FKED

8 1 R5 RES., 10k, 5%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW040210K0JNED

9 1 R6 RES., 1M, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW04021M00FKED

10 1 R7 RES., 249k, 1%, 1/16W, 0402, AEC-Q200 VISHAY, CRCW0402249KFKED

11 1 R8 RES., 100k, 5%, 1/16W, 0402 YAGEO, RC0402JR-07100KL

12 1 R9 RES., 0Ω, 1/16W, 0402 VISHAY, CRCW04020000Z0ED

13 1 R10 RES., 10k, 5%, 1/10W, 0402, AEC-Q200 PANASONIC, ERJ2GEJ103X

14 1 R11 RES., 0.1Ω, 1%, 2W, 2512, SENSE, AEC-Q200 IRC, LRC-LR2512LF-01-R100-F

Hardware: For Demo Board Only

1 10 E1-E3, E5, E12, E14-E16, E19, E21 TEST POINT, TURRET, 0.064" MTG. HOLE, PCB 0.062" THICK MILL-MAX, 2308-2-00-80-00-00-07-0

2 6 E4, E7, E11, E13, E18, E20 TEST POINT, TURRET, 0.094" MTG. HOLE, PCB 0.062" THICK MILL-MAX, 2501-2-00-80-00-00-07-0

3 5 E6, E8-E10, E17 CONN., BANANA JACK, FEMALE, THT, NON-INSULATED,

SWAGE, 0.218"

KEYSTONE, 575-4

4 1 JP1 CONN., HDR, MALE, 1x4, 2mm, VERT, STR, THT WURTH ELEKTRONIK, 62000411121

5 1 JP2 CONN., HDR, MALE, 1x3, 2mm, VERT, STR, THT WURTH ELEKTRONIK, 62000311121

6 4 MP1-MP4 STANDOFF, NYLON, SNAP-ON, 0.50" WURTH ELEKTRONIK, 702935000

7 0 TP1, TP3 CONN., U.FL, RECEPT, ST SMD, 0Hz to 6GHz 50Ω HIROSE ELECTRIC, U.FL-R-SMT-1(10)

8 2 XJP1, XJP2 CONN., SHUNT, FEMALE, 2 POS, 2mm WURTH ELEKTRONIK, 60800213421

DEMO MANUAL DC2745A

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

REVISION HISTORY

ECO REV DESCRIPTION APPROVED DATE

-6 PRODUCTION MM 06-11-19

1.2V

2.25V - 5.5V

VOUT

MODE/SYNC

GND

PGOOD

GND

MODE/SYNC

VIN

GND

VIN

GND

VOUT

GND

VOUT

SNSE

GND

SNSE

VIN

SNSE

GND

SNSE

FC/SYNC

BURST

SKIP

PCA ADDITIONAL PARTS

NOTES: UNLESS OTHERWISE SPECIFIED

1. RESISTORS: OHMS, 0402, 1%, 1/16W

2. CAPACITORS: 0402

VIN EMI

2.25V - 5.5V

5V, 6A SYNCHRONOUS STEP-DOWN SILENT SWITCHER

FSW=2MHz

GND

5.5V MAX

OPTIONAL EMI FILTER

ISTEP

RSNS

SG_INPUT

OPTIONAL TRANSIENT RESPONSE CIRCUIT

VOUT

20V MAX

VIN

DATE:

IC NO.

SHEET OF

TITLE: DEMO CIRCUIT SCHEMATIC,

APPROVALS

PCB DES.

APP ENG.

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

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONESIZE:

SKU NO. SCHEMATIC NO. AND REVISION:

PCA BOM:

PCA ASS'Y:

Phone: (408)432-1900

www.linear.comwww.analog.com

LTC3309A

700-DC2745A_REV07

710-DC2745A_REV06

705-DC2745A_REV06

N/A

06-11-19

DC2745A

DATE:

IC NO.

SHEET OF

TITLE: DEMO CIRCUIT SCHEMATIC,

APPROVALS

PCB DES.

APP ENG.

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

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONESIZE:

SKU NO. SCHEMATIC NO. AND REVISION:

PCA BOM:

PCA ASS'Y:

Phone: (408)432-1900

www.linear.comwww.analog.com

LTC3309A

700-DC2745A_REV07

710-DC2745A_REV06

705-DC2745A_REV06

N/A

06-11-19

DC2745A

DATE:

IC NO.

SHEET OF

TITLE: DEMO CIRCUIT SCHEMATIC,

APPROVALS

PCB DES.

APP ENG.

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

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONESIZE:

SKU NO. SCHEMATIC NO. AND REVISION:

PCA BOM:

PCA ASS'Y:

Phone: (408)432-1900

www.linear.comwww.analog.com

LTC3309A

700-DC2745A_REV07

710-DC2745A_REV06

705-DC2745A_REV06

N/A

06-11-19

DC2745A

E20

140k

100k

E17

PCB1 PCB, DC2745A REV06

E10

C13

1uF

0201

MP1 STANDOFF,NYLON,SNAP-ON,0.50"

E13

JP1

10k

E12

JP2

47uF

0805

MP4 STANDOFF,NYLON,SNAP-ON,0.50"

C12

OPT

E21

R10

10k

0.01uF

0201

E14

10uF

0603

C18

OPT

0805

6.8pF

R11

0.1

2512

C11

10uF

0603

0.1uF

E19

47uF

0805

E18

330uF

MP3 STANDOFF,NYLON,SNAP-ON,0.50"

OPT

TP1

TP3

C17

OPT

STNCL1 TOOL, STENCIL, 700-DC2745A REV06

E16

C15

1uF

0201

249k

C14

1uF

0201

C19

OPT

0805

LB1 LABEL

E11

TPB1

E15

LTC3309A-LQFN

SW 5

VFB 12

MODE/SYNC

RT 10

PGOOD 11

VIN

PGND

AGND

VIN

SW 6

PGND

C10

10uF

0603

TP2

MP2 STANDOFF,NYLON,SNAP-ON,0.50"

0.22uH

XFHCL43LT-R22M

TPA1

330uF

100 OHMS@100MHz

74279226101 C2

10uF

0603

100k

SIR426DP-T1-GE3

C16

1uF

0201

VOUT

DEMO MANUAL DC2745A

Rev. 0

 ANALOG DEVICES, INC. 2019

12/19

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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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.

Indice

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