Analog Devices Linear DC2543B Quick setup guide

DEMO MANUAL DC2543B

Rev. 0

DESCRIPTION

LTC7820EUFD

High Efficiency, Charge Pump

DC/DC Converter

Demonstration circuit 2543B is a high efficiency, high

density, open loop charge pump (inductorless) DC/DC

converter. This demo board is a voltage divider which

achieves a 2:1 step-down ratio from an input voltage from

36V to 60V. The output voltage is a fixed ratio of half of the

input voltage (VIN/2) and can supply a 10A load current.

This demo board has the option to deliver a 20A maximum

load with the addition of 15 chip capacitors. See Figure8

and Figure10 for the details.

The DC2543B provides a very high efficiency solution of

98.7% when converting 48VIN to 24VOUT at 10A as shown

in Figure3. When configured for a 20A output, an effi-

ciency of up to 98.4% is achievable for a 48VIN to 24VOUT

at 20A as shown in Figure8.

The demo board features the LT C

7820, a fixed ratio high

voltage high power switched capacitor/charge pump

controller in a 4mm × 5mm QFN package. Please see

LTC7820 data sheet for more detailed information.

PERFORMANCE SUMMARY

The DC2543B needs to be powered on with no load cur-

rent or a very small load current (less than 50mA) with

the default setup. Large load current can be applied after

VOis established. The board offers a disconnect FET

option which is controlled by the LTC7820 FAULT pin

to disconnect the load during startup as shown in the

schematic. Please refer to “Voltage Divider Prebalance

Before Switching”section in the LTC7820 data sheet for

more details regarding the startup of the voltage divider.

The board also features some protection functions

such as overcurrent and thermal shutdown to make it a

reliablesolution.

Design files for this circuit board are available at

http://www.analog.com/DC2543B

Specifications are at TA= 25°C

PARAMETER CONDITION VALUE

Input Voltage Range 36V to 60V

Output Voltage, VOUT VIN = 36 to 60V, IOUT = 0A to 10A VIN/2

Maximum Output Current, IOUT VIN = 36 to 60V, VOUT = VIN/2 10A

Typical Efficiency VIN = 48V, VOUT = 24V, IOUT = 10A 98.7%

Peak Efficiency VIN = 48V, VOUT = 24V 99%

Switching Frequency 200kHz

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

NOTE: DC2543B demo manual includes a Schottky diode added across the output. This manual describes the demo

board entitled “Demo Circuit 2543B.” The DC2543B replaces the DC2543A.

DEMO MANUAL DC2543B

Rev. 0

QUICK START PROCEDURE

Demonstration circuit 2543B is easy to set up to evaluate

the performance of the LTC7820. 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

(36V to 60V) 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/switch position:SW1 (RUN):

OFF; JP2 (BIAS): ON.

5. Turn on the input power supply and adjust voltage

to48V.

NOTE:Make sure that the input voltage does not

exceed60V.

6. Turn on the switches: SW1: ON.

7. Check for the proper output voltages from VO_SNS+to

VO_SNS–.

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 tech-

nique. 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.

2. When doing the load step test with the on-board

dynamic load circuit, please make sure the load step-

up pulse duty cycle does not exceed 2% and the pulse

duration is less than 500µs so that the temperature

of the MOSFETs Q9, Q23 in the dynamic load circuit

stay in the safe region. Instead of using the on-board

dynamic load circuit, an electric load can also be used

for the load step test, which does not have the 2%

maximum duty cycle limit for the load step.

3. It is recommended to set the electronic load in CR (con-

stant resistance) mode for evaluation of the DC2543B

board. Some electronic loads draw negative current in

CC (constant current) mode when evaluating the output

overcurrent protection feature of DC2543B, which can

violate the absolute maximum voltage rating –0.3V for

VLOW pin.

DEMO MANUAL DC2543B

Rev. 0

QUICK START PROCEDURE

–

+–

VIN

36V to 60V

–

LOAD

DC2543B F01

+ –

VOUT GND

COUT

Figure1. Proper Measurement Equipment Setup

Figure2. Measuring Output Voltage Ripple

Note: It is recommended to set the electronic load in CR (constant resistance) mode for evaluation of

the DC2543B board. Some electronic loads draw negative current in CC (constant current) mode when

evaluating the output overcurrent protection feature of DC2543B, which can violate the absolute maximum

voltage rating –0.3V for VLOW pin.

DEMO MANUAL DC2543B

Rev. 0

QUICK START PROCEDURE

Figure3. Efficiency vs Load Current at VIN = 48V,

VOUT = 24V, fSW = 200kHz

OUTPUT LOAD CURRENT (A)

EFFICIENCY (%)

100

24 6 8 10

DC2543B F03

OUTPUT LOAD CURRENT (A)

23.0

23.2

23.4

23.6

VOUT (V)

23.8

24.0

24.6

24.4

24.2

24 6 8 10

DC2543B F04

Figure4. Load Regulation for 10A Design

at VIN = 48V, VOUT = 24V, fSW = 200kHz

Figure5. Output Voltage Ripple at VIN = 48V,

VOUT = 24V, IOUT = 10A, fSW = 200kHz

Figure6. Load Step at VIN = 48V, VOUT = 24V

2µs/DIV

VOUT

RIPPLE

20MHz BW

500mV/DIV

DC2543B F05

100µs/DIV

0A-5A-0A

LOAD STEP

VOUT

20MHz BW

500mV/DIV

DC2543B F06

Figure7. Thermal performance VIN = 48V, VOUT = 24V, IOUT = 10A,

TA= 23°C, No Airflow

Q1 Q3

Q6 Q7

DEMO MANUAL DC2543B

Rev. 0

QUICK START PROCEDURE

OUTPUT LOAD CURRENT (A)

EFFICIENCY (%)

100

26 10 14

48 12 16 18 20

DC2543B F08

OUTPUT LOAD CURRENT (A)

23.0

VOUT (V)

23.2

23.4

24.6

24.2

23.8

23.6

24.4

24.0

26 10 14

48 12 16 18 20

DC2543B F09

Figure8. Efficiency vs Load Current at VIN = 48V,

VOUT = 24V, fSW = 200kHz*

Figure9. Load Regulation for 20A Design

at VIN = 48V, VOUT = 24V, fSW = 200kHz*

Figure10. Thermal performance at VIN = 48V, VOUT = 24V, IOUT = 20A

TA= 23°C, No Airflow*

* Note:Additional C11, C12, C60, C61, C22-C25, C69-C72, C30, C31, and C36 (10µF/50V, MURATA GRM32ER71H106KA12L) are populated;

RS1 is changed to 2.5mΩ (WSL20102L500FEB18) for this test.

Q1

Q3

Q6

Q7

DEMO MANUAL DC2543B

Rev. 0

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C1 CAP, 33µF 20% 80V ELEC PANASONIC EEHZA1K330P

2 8 C2, C3, C47, C49, C56, C57, C58, C59 CAP, 1210 2.2µF 10% 100V X7R MURATA GRM32DR72A225KA12

3 4 C4, C5, C15, C126 CAP, 0603 0.1µF 10% 100V X7R MURATA GRM188R72A104KA35D

4 2 C6, C7 CAP, 0805 4.7µF 10% 16V X7R MURATA GRM21BR71C475KA73K

5 1 C8 CAP, 0603 0.22µF 10% 25V X7R MURATA GRM188R71E224KA88D

6 2 C9, C26 CAP, 0603 0.47µF 10% 25V X7R MURATA GRM188R71E474KA12D

7 2 C17, C28 CAP, 0805 2.2µF 10% 50V X7R TDK C2012X7R1H225K125AC

8 11 C18, C19, C20, C21, C29, C66, C67 CAP, 1210 10µF 10% 50V X7R MURATA GRM32ER71H106KA12L

9 C68, C73, C74, C65

10 2 C27, C50 CAP, 0603 1µF 10% 50V X5R MURATA GRM188R61H105K

11 2 C52, C53 CAP, 1210 22µF 10% 25V X5R AVX 12103D226KAT2A

12 1 C54 CAP, 0603 47nF 10% 25V X7R AVX 06033C473KAT2A

13 1 C55 CAP, 0603 470pF 10% 50V X7R MURATA GRM188R71H471KA01D

14 3 D1, D2, D3 DIODE, SCHOTTKY CENTRAL SEMI. CMDSH-4E TR

15 1 D6* DIODE, SCHOTTKY ON SEMI, NRVTSAF5100E

16 2 D9, D10 DIODE, ZENER CENTRAL SEMI. CMHZ5236B TR

17 1 L2 IND, 68µH COILCRAFT., LPS6225-683MRB

18 1 Q1 XSTR, N-CHANNEL MOSFET INFINEON BSC027N06LS5

19 3 Q3, Q6, Q7 XSTR, N-CHANNEL MOSFET INFINEON BSC032N04LS

20 4 Q9, Q10, Q11, Q23 XSTR, N-CH 40V 14A TO-252 VISHAY SUD50N04-8M8P-4GE3

21 1 Q22 TRANSISTOR., SOT-23 FAIRCHILD., BSS123L

22 1 RS1 RES., CHIP, 0.005, 1%, 2010 VISHAY, WSL20105L000FEA

23 1 RS2 RES, 2010 0Ω JUMPER VISHAY WSL201000000ZEA9

24 2 R1, R7 RES, 0603 1kΩ 1% VISHAY CRCW06031K00FKEA

25 1 R2 RES, 0603 2.2Ω 5% YAGEO RC0603JR-072R2L

26 4 R5, R10, R24, R32 RES, 0603 0Ω JUMPER VISHAY CRCW06030000Z0EA

27 4 R9, R13, R17, R28 RES, 0603 10kΩ 1% NIC NRC06F1002TRF

28 1 R16 RES, 0603 60.4kΩ 1% VISHAY CRCW060360K4FKEA

29 1 R18 RES, 0603 100kΩ 1% VISHAY CRCW0603100KFKEA

30 1 R26 RES, 0603 154kΩ 1% YAGEO RC0603FR-07154KL

31 1 R27 RES, 0603 20kΩ 5% VISHAY CRCW060320K0JNEA

32 1 R29 RES, 0603 80.6kΩ 1% YAGEO RC0603FR-0780K6L

33 1 R30 RES. 2010 1Ω 1% 1W IRC LRC-LR2010-01-1R00-F

34 1 R31 RES, 0603 100Ω 5% VISHAY CRCW0603100R0JNEA

35 1 U1 IC, LTC7820EUFD, QFN 4mm × 5mm ANALOG DEVICES, ALTC7820EUFD#PBF

36 1 U2 IC, LTC3630AEMSE ANALOG DEVICES, LTC3630EMSE#PBF

DEMO MANUAL DC2543B

Rev. 0

PARTS LIST

Additional Demo Board Circuit Components

1 0 C10-C14, C16, C33, C34, C35, C36,

C60-C64, C51, C77

CAPACITOR, OPT

2 0 C30-C32, C22-C25, C69-C72, C127

3 0 Q2, Q4, Q5,Q8 OPT MOSFET, OPT

4 0 R6, R19, R2, R36, R8, R11, R12,

R20, R34, R35, R60

RESISTOR, OPT

Hardware: For Demo Board Only

1 9 E1, E2, E6-E8, E10, E12, E14, E15 TURRET MILL-MAX 2501-2-00-80-00-00-07-0

2 1 JP2 HEADER, 3 PIN 2mm WURTH ELEKTRONIK 62000311121

3 4 J1, J2, J3, J4 JACK, BANANA KEYSTONE, 575-4

4 2 J5, J6 CONN, BNC, 5 PINS CONNEX, 112404

5 1 SW1 SWITCH, SUBMINIATURE SLIDE C&K COMPONENTS, JS202011CQN

6 1 XJP2 SHUNT 2mm WURTH ELEKTRONIK 60800213421

7 4 STANDOFF STANDOFF, SNAP ON KEYSTONE 8833

*Note: D6 is for negative voltage clamping on VOUT of DC2543B board in output overcurrent test with electronic load. Some electronic loads draw negative

current in CC mode when evaluating the output overcurrent protection feature of DC2543B, which can violate the absolute maximum voltage rating –0.3V

for VLOW pin without D6 populated.

DEMO MANUAL DC2543B

Rev. 0

SCHEMATIC DIAGRAM

D D

C C

B B

A A

1/2VIN, 10A

NOTES: UNLESS OTHERWISE SPECIFIED,

1. CAPACITORS AND RESISTORS ARE 0603.

36V-60V

RUN

OFF

SW1

SW3

MID

VIN1

INTVCC

VOUT1

VIN1VIN

INTVCC EXTVCC

VIN1 VIN1 VIN VOUT1

INTVCC

VIN

VOUT VIN

VIN1 VIN

VIN1

VOUT

FAULTB

BOOST2

FAULTB

BOOST2

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

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

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE

www.linear.com

Monday, March 26, 2018 12

HIGH EFFICIENCY,CHARGE PUMP DC/DC CONVERTER

N/A LTC7820EUFD

DEMO CIRCUIT 2543B

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

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

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE

www.linear.com

Monday, March 26, 2018 12

HIGH EFFICIENCY,CHARGE PUMP DC/DC CONVERTER

N/A LTC7820EUFD

DEMO CIRCUIT 2543B

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

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

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE

www.linear.com

Monday, March 26, 2018 12

HIGH EFFICIENCY,CHARGE PUMP DC/DC CONVERTER

N/A LTC7820EUFD

DEMO CIRCUIT 2543B

REVISION HISTORY

DESCRIPTION DATE

APPROVED

ECO REV

PRODUCTION2 3-29-17

REVISION HISTORY

DESCRIPTION DATE

APPROVED

ECO REV

PRODUCTION2 3-29-17

REVISION HISTORY

DESCRIPTION DATE

APPROVED

ECO REV

PRODUCTION2 3-29-17

C15

0.1uF

100V

J4 GND

C64

OPT

LTC7820EUFD

RUN

FAULT

PGOOD

TIMER

ISENSE+ 27

EXTVCC

ISENSE- 28

G4 15

INTVCC

SW3 16

G3 17

G2 21

HYS_PRGM

FREQ

BOOST3 18

BOOST2 22

VLOW 20

VLOW_SENSE 19

VHIGH_SENSE 1

Vcc 14

SW1 25

G1 24

BOOST1 23

GND

OPT

SW1

C23 C66

Q22

BSS123L

2 3

C36

OPT

1210

50V

D3 CMDSH-4

4.7uF

16V

0805

C71

+C127

OPT

100V

C28

2.2uF

0805

50V

R10 0

BSC027N06LS5

1k 1%

NRVTSAF5100

C31

R36

OPT

0805

C19

R20

OPT

R18

100K

VIN

RS1 0.005

2010

OPT

C16

OPT

D10

CMHZ5236B

C67

10uF

1210

2.2uF

1210

100V

C59

2.2uF

1210

100V

C24

R31

100

RUN

C73

10uF

1210

50V

C72

BSC032N04LS

E12

VO_SNS-

C14

1210

0.1uF

100V

R60

OPT

R17

10K

C34

OPT

CMHZ5236B

0.22uF

R11

OPT

C68

J3 VOUT

C10

OPT

0805

R32

R7 1k 1%

C60

OPT

1210

CMDSH-4

2 1

C20

50V

C32

4.7uF

25V

0805

GND

BSC032N04LS

10K

R21

OPT

0805

C13

Q11

SUD50N04

C56

2.2uF

1210

100V

RS2 0

2010

R35

OPT

BSC032N04LS

C17

2.2uF

0805

50V

C61

C12

C74

10uF

1210

50V

2.2

C11

OPT

R13

10K

R19

OPT

0805

R12

OPT

C25

C35

E10

VO_SNS+

CMDSH-4

2 1

C26 0.47uF

C69

OPT

1210

50V

33uF

80V

C126

0.1uF

C29

10uF

1210

50V

R34

OPT

GND

C62

2.2uF

1210

100V

C18

OPT

0805

0.1uF

100V

C22

OPT

1210

50V

C65

50V

C27

1uF

C33

OPT

Q10

SUD50N04

2 3

R16

60.4K

FAULTB

C57

2.2uF

1210

100V

C70

0.47uF

C58

2.2uF

1210

100V

PGOOD

VIN

C77

OPT

C63

C30

OPT

C21

10uF

1210

DEMO MANUAL DC2543B

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

2% DUTY CYCLE MAX.

DO NOT EXCEED

DYNAMIC LOAD CIRCUIT

7V BIAS

VOUT

VIN EXTVCC

+7V

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

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

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE

www.linear.com

Monday, March 26, 2018 22

HIGH EFFICIENCY,CHARGE PUMP DC/DC CONVERTER

N/A LTC7820EUFD

DEMO CIRCUIT 2543B

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

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

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE

www.linear.com

Monday, March 26, 2018 22

HIGH EFFICIENCY,CHARGE PUMP DC/DC CONVERTER

N/A LTC7820EUFD

DEMO CIRCUIT 2543B

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

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

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SCALE = NONE

www.linear.com

Monday, March 26, 2018 22

HIGH EFFICIENCY,CHARGE PUMP DC/DC CONVERTER

N/A LTC7820EUFD

DEMO CIRCUIT 2543B

R30

2010

Q23

SUD50N04

R27

20K

R29

80.6k

C52

22uF

25V

1210

LTC3630AEMSE

SW 1

VIN

FBO

VPRG1 7

VPRG2 6

GND

VFB 9

SS 10

ISET

GND

RUN

GND

E15

GND

68uH

LPS6225-683MRB

R28

10k

C49

2.2uF

1210

100V

C53

22uF

25V

1210

C55

470pF

R24

VOUT

C54

47nF

C50

1uF

C47

2.2uF

1210

100V

JP2

OFF

BIAS

IOSTEP

E14

IO_CLK

R26

154K

C51

OPT

SUD50N04

DEMO MANUAL DC2543B

Rev. 0

 ANALOG DEVICES, INC. 2018

DC2543B 0818(0)

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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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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