Analog Devices DC2990A Manuel utilisateur

DEMO MANUAL DC2990A

Rev. 0

DESCRIPTION

LTC3307A

5V Input to 1.2V Output at 3A Synchronous

Step‑Down Silent Switcher Demo Circuit

Demonstration circuit 2990A features the LTC

3307A

5V, 3A synchronous step-down Silent Switcher

oper-

ating as a 2MHz, 3.3V to 1.2V 3A buck regulator. The

LTC3307A supports adjustable output voltages from

0.5V to VIN with operating frequencies from 1MHz up to

3MHz. The LTC3307A is a compact, ultralow emission,

high efficiency, and high speed synchronous monolithic

step-down switching regulator. A minimum on-time of

22ns enables high VIN to low VOUT conversion ratios at

high frequencies.

The DC2990A operating mode may be selected as Burst,

Skip or forced continuous (FC) mode. Setting JP1 to the

FC/SYNC position will allow the LTC3307A to sync to

a clock frequency from 1MHz to 3MHz. The LTC3307A

operates in forced continuous mode when syncing to an

external clock. The DC2990A is set to a fixed 2MHz fre-

quency by connecting 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 LTC3307A 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 DC2990A 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 LTC3307A 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 LTC3307A 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 3 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% resistors.

DEMO MANUAL DC2990A

Rev. 0

BOARD PHOTO

CIRCUIT SCHEMATIC

High Efficiency, 2MHz, 1.2V 3A Step-Down Converter Efficiency and Power Loss

in Burst Mode Operation

1µF

0201

EN SW

VIN VIN

PGND

140k10pF

4.7µF

470nH

100k

15µF

VOUT

1.2V

VIN = 2.25V TO 5.5V

AGND

PGOOD

LTC3307A

1µF

0201

MODE/SYNC

fOSC = 2MHz

VIN

10nF

= 3.3V

OUT

= 1.2V

= 2 MHz

EFFICIENCY

POWER LOSS

Murata DFE201210S–R47M

LOAD CURRENT (A)

0.001

0.01

0.1

100

0.0001

0.001

0.01

0.1

EFFICIENCY (%)

POWER LOSS (W)

DEMO MANUAL DC2990A

Rev. 0

EMI TEST RESULTS

Conducted EMI Performance (CISPR25 Conducted Emission Test

with Class 5 Peak Limits)

DC2990A DEMO BOARD

(WITH EMI FILTER INSTALLED)

3.3V INPUT TO 1.2V OUTPUT AT 2.4A, f

= 2MHz

CLASS 5 PEAK LIMIT

MEASURED EMISSIONS

RADIATED NOISE

FREQUENCY (MHz)

100

110

–20

–10

AMPLITUDE (dBµV/m)

dc2990a G01

DC2990A DEMO BOARD

(WITH EMI FILTER INSTALLED)

3.3V INPUT TO 1.2V OUTPUT AT 2.4A, f

= 2MHz

HORIZONTAL POLARIZATION

CLASS 5 PEAK LIMIT

MEASURED EMISSIONS

AMBIENT NOISE

FREQUENCY (MHz)

100

200

300

400

500

600

700

800

900

1000

–20

–10

AMPLITUDE (dBµV/m)

dc2990a G02

DC2990A DEMO BOARD

(WITH EMI FILTER INSTALLED)

3.3V INPUT TO 1.2V OUTPUT AT 2.4A, f

= 2MHz

VERTICAL POLARIZATION

CLASS 5 PEAK LIMIT

MEASURED EMISSIONS

AMBIENT NOISE

FREQUENCY (MHz)

100

200

300

400

500

600

700

800

900

1000

–20

–10

AMPLITUDE (dBµV/m)

dc2990a G03

Radiated EMI Performance (CISPR25 Radiated Emission Test

with Class 5 Peak Limits)

Forced Continuous Mode

3.3V

IN TO 1.2V

OUT

LOADSTEP 0.6A TO 2.4A 1A/µs

10µs/DIV

SG_INPUT

2V/DIV

VOUT 1.2V

20mV/DIV

RSNS

100mV/DIV

dc2990a G04

VIN = 3.3V

VOUT = 1.2V

FORCED CONTINUOUS MODE

IOUT (A)

0.0

0.5

1.0

1.5

2.0

2.5

1.190

1.192

1.194

1.196

1.198

1.200

1.202

1.204

1.206

1.208

1.210

VOUT (V)

LTC3307A Load Regulation

dc2990a G05

Load Transient Response Forced Continuous Mode LTC3307A Load Regulation

dcXXXXa F00

DEMO MANUAL DC2990A

Rev. 0

QUICK START PROCEDURE

Demonstration circuit 2990A is easy to set up and evalu-

ate the performance of the LTC3307A. Refer to Figure1

for proper measurement equipment setup and follow the

procedure below.

NOTE: For accurate VIN, VOUT and efficiency measure-

ments, measure VIN at the VIN SNSE and GND SNSE

turrets and VOUT at the VOUT SNSE and GND SNSE tur-

rets 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 oscillo-

scope 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 cou-

pled, 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 4A 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. Set the load to a constant 1.5A. 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 (~500ns).

9. Set the load current to 0.2A and repeat Step 8. Observe

that the switching waveform is now operating in pulse-

skippping 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 operation is

desired, set PS1 to 0V. Move JP1 to FC/SYNC or

BURST. Repeat Steps 3 through 9. In Step 9 observe

that the switching waveform is now operating in

forced continuous or Burst Mode operation.

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

Install the desired RTresistor in the R4 location. Size

the inductor and output capacitors to provide the

desired inductor ripple and a stable output. Refer to

the LTC3307A 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 between

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,

RSNS/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.

IOUT = VRSNS/100mΩ

Where:

VRSNS = VSG_INPUT − VGS

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

connections to the demo board.

DEMO MANUAL DC2990A

Rev. 0

QUICK START PROCEDURE

Figure1. Test Setup for the DC2990A Demo Board

Figure2. Technique for Measuring Output Ripple

and Step Response with a Scope Probe

Figure3. Technique for Measuring Output Ripple and Step

Response with a Low Inductance Connector (Not Supplied)

DEMO MANUAL DC2990A

Rev. 0

Introduction to the DC2990A

The DC2990A features the LTC3307A, a low voltage syn-

chronous step-down Silent Switcher. The LTC3307A is a

monolithic, constant frequency, 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 beginning 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 LTC3307A 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-

skipping, forced continuous, or Burst Mode operation.

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 LTC3307A switching frequency will sync to

Figure4. Optional Transient Response Circuit

QUICK START PROCEDURE

THEORY OF OPERATION

the external clock while operating in forced continuous

mode. See the LTC3307A 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

VOUT to VIN and the available inductor values. The maxi-

mum allowable operating frequency may be calculated

using a minimum TON of 42ns in Equation 1.

fSWMAX =

OUT

INMAX

•TON

MIN

(1)

Select an operating switching frequency below fSWMAX.

The recommended ripple current in the output inductor is

0.9A peak-to-peak for the LTC3307A. This determines the

recommended inductor value for the application.

DEMO MANUAL DC2990A

Rev. 0

THEORY OF OPERATION

The high frequency spikes are partially attributed to the

interwinding 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

Figure5.

Figure6.

TP1

50Ω PROBE

= 3.3V

OUT

= 1.2V

OUT

= 3A

500ns/DIV

1.2V

10mV/DIV

dc2990a F05

TP3

50Ω PROBE

= 3.3V

OUT

= 1.2V

OUT

= 3A

C4, C5 = 22µF 0603

C17 = 1µF

C18, SC19 = 10µF 0603

500ns/DIV

1.2V

10mA/DIV

dc2990a F06

Accurately Measuring Output Ripple of the LTC3307A

With the fast edge rates of the circuit, high frequency

noise can be observed when measuring the output voltage

with 1MΩ terminated oscilloscope probes. To better view

the output ripple with oscilloscopes of 400MHz band-

width and above a 50Ω coax cable connected as close

to the output capacitor 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 capacitor C4. These pads can also

be used to solder a coax cable or other oscilloscope probe

connector if desired.

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 capacitors, trace inductance, and load

decoupling capasitors and will also help to reduce the

ripple. Figure6 shows the output ripple using a 500MHz

scope, 50Ω probe with C4 and C5 reduced to 22μF 0603

capacitors. The capacitors near the VOUT turret on the

bottom of the board were also populated 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.

DEMO MANUAL DC2990A

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., 4.7μF, X6S, 6.3V, 20%, 0402 MURATA, GRM155C80J475MEAAD

3 2 C4, C5 CAP., 22μF, X6S, 6.3V, 20%, 0603 MURATA, GRM188C80J226ME15D

4 1 C6 CAP., 10pF, C0G, 50V, 5%, 0402, AEC-Q200 MURATA, GCM1555C1H100JA16D

5 2 C13, C14 CAP., 1μF, X7T, 6.3V, 20%, 0201 MURATA, GRM033D70J105ME01D

6 1 L1 IND., 0.47μH, POWER, 20%, 3.4A, 0.032Ω, 0805 MURATA, DFE201210S-R47M=P2

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, 5V, 3A SYNCHRONOUS STEP-DOWN Silent Switcher,

12-PIN 2×2 LQFN

ANALOG DEVICES, LTC3307AEV#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, 16V, 10%, 0402, AEC-Q200 MURATA, GCM155R71C104KA55D

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

4 2 C15, C16 CAP., 1μF, X7T, 6.3V, 20%, 0201 MURATA, GRM033D70J105ME01D

5 1 L2 IND., 80Ω, FERRITE BEAD, 25%, 4A, 0.018Ω, 0805, 100MHz WURTH ELEKTRONIK, 74279220800

6 1 Q1 XSTR., MOSFET, N-CH, 40V, 15.9A, PPAK SO-8 VISHAY, SIR426DP-T1-GE3

7 1 R3 RES., 20Ω, 1%, 1/16W, 0402, AEC-Q200 NIC, NRC04F20R0TRF

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

9 1 R6 RES., 1MΩ, 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" THK 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" THK 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, 1×4, 2mm, VERT, ST, THT WURTH ELEKTRONIK, 62000411121

5 1 JP2 CONN., HDR, MALE, 1×3, 2mm, VERT, ST, 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 DC2990A

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

-2 PRODUCTION MM 09-20-19

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

FSW=2MHz

GND

5.5V MAX

OPTIONAL EMI FILTER

ISTEP

RSNS

SG_INPUT

OPTIONAL TRANSIENT RESPONSE CIRCUIT

VOUT

20V MAX

0603 0603

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

LTC3307A

700-DC2990A_REV02

710-DC2990A_REV02

705-DC2990A_REV02

N/A

09-20-19

DC2990A

5V, 3A SYNCHRONOUS STEP-DOWN SILENT SWITCHER

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

LTC3307A

700-DC2990A_REV02

710-DC2990A_REV02

705-DC2990A_REV02

N/A

09-20-19

DC2990A

5V, 3A SYNCHRONOUS STEP-DOWN SILENT SWITCHER

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

LTC3307A

700-DC2990A_REV02

710-DC2990A_REV02

705-DC2990A_REV02

N/A

09-20-19

DC2990A

5V, 3A SYNCHRONOUS STEP-DOWN SILENT SWITCHER

E13

MP1 STANDOFF,NYLON,SNAP-ON,0.50"

E16

100k

E21

MP3 STANDOFF,NYLON,SNAP-ON,0.50"

TP1

MP2 STANDOFF,NYLON,SNAP-ON,0.50"

140k

C12

OPT

SIR426DP-T1-GE3

TP3

MP4 STANDOFF,NYLON,SNAP-ON,0.50"

E11

22uF

E19

LB1 LABEL

100k

E10

C19

OPT

0805

330uF

6TPE330ML C9

0.1uF

TP2

4.7uF

PCB1 PCB, DC2990A REV02

E14

C18

OPT

C10

10uF

0603

249k

R10

10k

C15

1uF

0201

STNCL1 TOOL, STENCIL, 700-DC2990A REV02

C17

OPT

C16

1uF

0201

C11

10uF

0603

LTC3307A-LQFN

SW 5

VFB 12

MODE/SYNC

RT 10

PGOOD 11

VIN

PGND

AGND

VIN

SW 6

PGND

22uF

E18

E20

0.01uF

0201

4.7uF

E17

0.47uH

DFE201210S-R47M=P2

JP2

C13

1uF

0201

80OHM

74279220800

C14

1uF

0201

R11

0.1

2512

10pF

TPA1

E12

JP1

10k

E15

OPT

330uF

6TPE330ML

TPB1

VOUT

DEMO MANUAL DC2990A

Rev. 0

 ANALOG DEVICES, INC. 2020

01/20

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.

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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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