Linear Technology DC2003A Quick setup guide

dc2003af

DEMO MANUAL DC2003A

Description

LTC3622EDE

17V, Dual 1A, Synchronous Step-Down Regulator

with Ultralow Quiescent Current

Demonstration circuit 2003A is a synchronous step-down

regulatorusingthepower-saving LTC3622EDE monolithic

buck regulator in a compact 14-pin DFN (4mm × 3mm)

package. The DC2003A operates from an input voltage

range of 2.7V to 17V and provides dual 1A outputs with

an adjustable output voltage range from 1.2V to 5V. The

LTC3622 IC quiescent current can be as low as 5µA in

BurstMode

operation with both channels enabledand less

than 0.1µA in shutdown mode. The switching frequency is

fixed to 1MHz or 2.25MHz with a ±50% synchronization

range to an external clock. A user-selectable mode input

is provided to allow the user to trade off ripple noise for

L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks

of Linear Technology Corporation. All other trademarks are the property of their respective

owners.

performance summary

light load efficiency. Burst Mode operation provides the

highestefficiency at light loads, while pulse-skipping mode

provides the lowest ripple noise.

It is recommended to read the data sheet LTC3622 with

this demo manual prior to working on or making any

changes to DC2003A.

Design files for this circuit board are available at

http://www.linear.com/demo

Specifications are at TA= 25°C

PARAMETER CONDITIONS VALUE

Default IC LTC3622EDE

Default Switching Frequency 1MHz

Default Operation Mode Burst Mode Operation

Input Voltage Range 2.7V to 17V

Onboard User Selectable Output Voltages VIN = 2.7V to 17V, IOUT1 = IOUT2 = 0A to 1A

(VOUT ≤ VIN)

VOUT1: 1.2V, 1.8V, 2.5V, 3.3V

VOUT2: 1.5V, 1.8V, 3.3V, 5V

Default Output Voltage VOUT1 = 3.3V

VOUT2 = 5V

Per Channel Maximum Continuous Output

Current

VIN = 2.7V to 17V IOUT1 = IOUT2 = 1A

Efficiency, VOUT1 (Burst Mode Operation) VIN = 12V, VOUT1 = 3.3V, IOUT1 = 1A 88.2% (See Figure 3)

Efficiency, VOUT2 (Burst Mode Operation) VIN = 12V, VOUT2 = 5.V, IOUT2 = 1A 90.8% (See Figure 4)

Output Voltage Ripple, VOUT1 VIN = 12V, VOUT1 = 3.3V, IOUT1 = 1A <5.9mVP-P (See Figure 5)

Output Voltage Ripple, VOUT2 VIN = 12V, VOUT2 = 5V, IOUT2 = 1A <7.8mVP-P (See Figure 6)

Load Transient Response, VOUT1 VIN = 12V, VOUT1 = 3.3V, IOUT1 = 100mA to 1A See Figure 7

Load Transient Response, VOUT2 VIN = 12V, VOUT2 = 5V, IOUT2 = 100mA to 1A See Figure 8

Thermal Image VIN = 12V, VOUT1 = 3.3V, VOUT2 = 5V, IOUT1 = IOUT2 = 1A See Figure 9

Downloaded from Arrow.com.

dc2003af

DEMO MANUAL DC2003A

Quick start proceDure

Demonstration circuit 2003A is easy to set up to evaluate

the performance of the LTC3622. Please refer to Figure 1

for proper measurement equipment setup and follow the

procedure below:

1. Place jumpers in the following positions:

Table 1. Jumper Selection

JP1 JP2 JP3 JP4 JP5

RUN1 RUN2 MODE/SYNC PHASE ILIM

ON ON BURST 180° 1A

2. Place VO1 SELECT jumper in 3.3V position (JP9) and

VO2 SELECT jumper in 5V position (JP14).

3. With power off, connect the input power supply at VIN1

and GND.

4. Connect the Loads between VOUT1 and GND, VOUT2 and

GND. Preset the loads to 0A.

5. Connect the DMMs to the input and output to monitor

the input voltage and output voltages.

6. Turn on the power supply at the input. The RUN1 and

RUN2 pin jumpers should be at ON position. Measure

and make sure the input supply voltage is 12V. The

output voltage VOUT1 should be 3.3V±1%, and VOUT2

should be 5V±1%.

7. Once the input and output voltages are properly es-

tablished adjust theloads within the operating range (0A

to 1A max) and observe the output voltage regulations,

output ripple voltages, switch node wave-forms and

other parameters. Refer to Figure 2 for proper input/

output voltage ripple measurement.

8. To select other output voltages, use the on board user

selectable output voltage jumpers. Shutting down

LTC3622 by placing RUN1 and RUN2 pin jumpers to

the OFF position or turn off the input power supply.

Refer to the following tables (Table 2 and Table 3) for

the output voltage selections and repeat step 3 to 6:

Table 2. VOUT1 Jumper Selection

JP6 JP7 JP8 JP9 JP10

1.2V 1.8V 2.5V 3.3V *USER SELECT

Table 3. VOUT2 Jumper Selection

JP11 JP12 JP13 JP14 JP15

1.5V 1.8V 3.3V 5V *USER SELECT

*Note: If JP10 or JP15 is selected, R5 or R15 needs to be calculated

and inserted to obtain the desired output voltage.

Note 1: To measure the input/output voltage ripple prop-

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

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

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.

Note 2: DC2003A can also be used to evaluate

LTC3622EDE-2 (2.25MHz) by simply changing U1 to

LTC3622EDE-2, L1 to 1µH(Coilcraft XFL4020-102ME)

and L2 to 2.2µH (Coilcraft XFL4020-222ME).

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dc2003af

DEMO MANUAL DC2003A

Quick start proceDure

+ –

VOUT GND

COUT

Figure 1. Proper Equipment Measurement Setup

Figure 2. Scope Probe Placements for Measuring Input or Output Ripple

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dc2003af

DEMO MANUAL DC2003A

LOAD CURRENT (A)

EFFICIENCY (%)

DC2003A F03

100

0.0001 0.1 10.010.001

BURST MODE OPERATION

PULSE-SKIPPING MODE

LOAD CURRENT (A)

EFFICIENCY (%)

DC2003A F04

100

0.0001 0.1 10.010.001

BURST MODE OPERATION

PULSE-SKIPPING MODE

Quick start proceDure

Figure 3. VOUT1 Measured Efficiency at VIN = 12V, VOUT1 = 3.3V, L1 = 3.3µH,

FSW = 1MHz (with VOUT2 OFF)

Figure 4. VOUT2 Measured Efficiency at VIN = 12V, VOUT2 = 5V, L2 = 4.7µH,

FSW = 1MHz (with VOUT1 OFF)

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dc2003af

DEMO MANUAL DC2003A

DC2003a F05

20MHz BW LIMIT

VOUT1

10mV/DIV

t(2µs/DIV)

DC2003a F06

20MHz BW LIMIT

VOUT2

10mV/DIV

t(2µs/DIV)

Quick start proceDure

Figure 5. VOUT1 Measured Output Voltage Ripple at VIN = 12V, VOUT1 = 3.3V, IOUT1 = 1A, FSW = 1MHz

Figure 6. VOUT2 Measured Output Voltage Ripple at VIN = 12V, VOUT2 = 5V, IOUT2 = 1A, FSW = 1MHz

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dc2003af

DEMO MANUAL DC2003A

DC2003a F08

IOUT2: 100mA-1A

IOUT2

0.5A/DIV

VOUT2

200mV/DIV

t(100µs/DIV)

DC2003a F07

IOUT1: 100mA-1A

IOUT1

0.5A/DIV

VOUT1

200mV/DIV

t(100µs/DIV)

Quick start proceDure

Figure 7. Load Transient Response at VIN = 12V, VOUT1 = 3.3V, IOUT1 = 100mA-1A, FSW = 1MHz, Burst Mode Operation

Figure 8. Load Transient Response at VIN = 12V, VOUT2 = 5V, IOUT2 = 100mA-1A, FSW = 1MHz, Burst Mode Operation

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dc2003af

DEMO MANUAL DC2003A

DC2003a F09

Quick start proceDure

Figure 9. Thermal Performance at VIN = 12V, VOUT1 = 3.3V, IOUT1 = 1A, VOUT2 = 5V, IOUT2 = 1A, FSW = 1MHz, No Airflow

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dc2003af

DEMO MANUAL DC2003A

parts List

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 CFF1, CFF2 CAP, 0402 22pF 5% 50V NPO AVX 04025A220JAT2A

2 2 CIN1, CIN2 CAP, 7343 22µF 20% 35V TANT AVX TPSY226M035R0200

3 2 C1, C2 CAP, 1206 47µF 20% 16V X5R TDK C3216X5R1C476M160AB

4 2 C5, C6 CAP, 1206 10µF 20% 25V X5R TDK C3216X5R1E106M

5 1 C7 CAP, 0402 1µF 20% 10V X5R TDK C1005X5R1A105M

6 1 L1 IND, 3.3µH 20% COILCRAFT XFL4020-332MEC

7 1 L2 IND, 4.7µH 20% COILCRAFT XFL4020-472MEC

8 2 RPG1, RPG2 RES, 0402 100kΩ 1% 1/16W VISHAY CRCW0402100KFKED

9 3 RSET1, R1, RSET2 RES, 0402 619kΩ 1% 1/16W VISHAY CRCW0402619KFKED

10 2 R2, R12 RES, 0402 309kΩ 1% 1/16W VISHAY CRCW0402309KFKED

11 1 R3 RES, 0402 196kΩ 1% 1/16W VISHAY CRCW0402196KFKED

12 2 R4, R13 RES, 0402 137kΩ 1% 1/16W VISHAY CRCW0402137KFKED

13 1 R6 RES, 0805 0Ω JUMPER VISHAY CRCW08050000Z0ED

14 2 R7, R8 RES, 0402 0Ω JUMPER VISHAY CRCW04020000Z0ED

15 1 R11 RES, 0402 412kΩ 1% 1/16W VISHAY CRCW0402412KFKED

16 1 R14 RES, 0402 84.5kΩ 1% 1/16W VISHAY CRCW040284K5FKED

17 1 U1 IC, DUAL SYNCHRONOUS STEP-DOWN CONVERTER LINEAR TECHNOLOGY LTC3622EDE

Additional Demo Board Circuit Components

1 0 C3, C4 CAP, 0402 OPTION OPTION

2 0 R5, R15 RES, 0402 OPTION OPTION

Hardware: For Demo Board Only

1 12 E1, E2, E3, E4, E5, E6, E7, E8,

E9, E10, E11, E12

TURRET MILL-MAX 2501-2-00-80-00-00-07-0

2 2 JP1, JP2 HEADER, 3PIN, 2mm SULLINS NRPN031PAEN-RC

3 2 JP3, JP5 HEADER, 3PIN, DBL ROW 2mm SULLINS NRPN032PAEN-RC

4 1 JP4 HEADER, 2mm DBL ROW (2X2) 4PIN SULLINS NRPN022PAEN-RC

5 10 JP6, JP7, JP8, JP9, JP10, JP11,

JP12, JP13, JP14, JP15

HEADER, 2PIN, 2mm SULLINS NRPN021PAEN-RC

6 7 XJP1, XJP2, XJP3, XJP4, XJP5,

XJP6, XJP13

SHUNT, 2mm SAMTEC 2SN-BK-G

7 4 MH1, MH2, MH3, MH4 STANDOFF, SNAP ON KEYSTONE_8831

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dc2003af

DEMO MANUAL DC2003A

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-

tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

schematic Diagram

D D

C C

B B

A A

SYNC

BURST

PULSE-SKIP

PCB NO.

VOUT1

VOUT2

180

SELECT

INTVCC

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

Tuesday, June 10, 2014

DUAL WIDE VIN SYNCHRONOUS BUCK REGULATOR

` \

HAORAN W.

N/A

LTC3622EDE

DEMO CIRCUIT 2003A

WITH ULTRA-LOW QUIESCENT CURRENT

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

Tuesday, June 10, 2014

DUAL WIDE VIN SYNCHRONOUS BUCK REGULATOR

` \

HAORAN W.

N/A

LTC3622EDE

DEMO CIRCUIT 2003A

WITH ULTRA-LOW QUIESCENT CURRENT

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

Tuesday, June 10, 2014

DUAL WIDE VIN SYNCHRONOUS BUCK REGULATOR

` \

HAORAN W.

N/A

LTC3622EDE

DEMO CIRCUIT 2003A

WITH ULTRA-LOW QUIESCENT CURRENT

REVISION HISTORY

DESCRIPTION DATE APPROVEDECO REV

TOM G.PROTO1 06/26/12

PROD 01/23/14 HAORAN W.

REVISION HISTORY

DESCRIPTION DATE APPROVEDECO REV

TOM G.PROTO1 06/26/12

PROD 01/23/14 HAORAN W.

REVISION HISTORY

DESCRIPTION DATE APPROVEDECO REV

TOM G.PROTO1 06/26/12

PROD 01/23/14 HAORAN W.

JP9

3.3V

JP9

3.3V

1uF

JP10

USER SELECT

JP10

USER SELECT

JP3

MODE/SYNC

JP3

MODE/SYNC

1 2

3 4

5 6

309k

CIN2

22uF

35V

7343

CIN2

22uF

35V

7343

R14

84.5K

R14

84.5K

RPG1

100k

RPG1

100k

R11

412k

R11

412k

JP15

USER SELECT

JP15

USER SELECT

R15

OPT

R15

OPT

SYNC

L2 4.7uHL2 4.7uH

LTC3622EDE

VIN2

FB1 12

RUN2

FB2 10

INTVCC

SW2 8

SW1 14

RUN1

GND

ILIM

PGOOD2 5

PHASE

MODE/SYNC

VIN1

1PGOOD1 2

RSET1

619k

RSET1

619k

VIN1

2.7V - 17V

VIN1

2.7V - 17V

JP4

PHASE

JP4

PHASE

1 2

3 4

RSET2

619k

RSET2

619k

CIN1

22uF

35V

7343

CIN1

22uF

35V

7343

E12

GND

E12

GND

0805

R13

137k

R13

137k

JP1

OFF

RUN1

JP1

OFF

RUN1

JP13

3.3V

JP13

3.3V

22pF

CFF2

22pF

CFF2

PGOOD1

INTVCC

3.6V

INTVCC

3.6V

22pF

CFF1

22pF

CFF1

GND

VOUT1

JP6

1.2V

JP6

1.2V

PGOOD2

47uF

1206

47uF

1206

RPG2

100k

RPG2

100k

JP11

1.5V

JP11

1.5V

R12

309k

R12

309k

619k

196k

JP14

GND

VOUT2

47uF

1206

47uF

1206

137k

OPT

10uF

25V

1206

10uF

25V

1206

JP7

1.8V

JP7

1.8V

JP5

ILIM

500mA

500mA CHAN 2 ONLY

JP5

ILIM

500mA

500mA CHAN 2 ONLY

1 2

3 4

5 6

OPT

E11

VIN2

2.7V - 17V

E11

VIN2

2.7V - 17V

10uF

25V

1206

10uF

25V

1206

JP8

2.5V

JP8

2.5V

JP12

1.8V

JP12

1.8V

E10

GND

E10

GND

JP2

RUN2

OFF

JP2

RUN2

OFF

OPT

L1 3.3uHL1 3.3uH

dc2003af

DEMO MANUAL DC2003A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com

 LINEAR TECHNOLOGY CORPORATION 2014

LT 0714 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LT C ) provides the enclosed product(s) under the following AS IS conditions:

This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT

OR EVALUATION PURPOSES ONLY and is not provided by LT C for commercial use. As such, the DEMO BOARD herein may not be complete

in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety

measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union

directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.

If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date

of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU

OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS

FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR

ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.

The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LT C from all claims

arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all

appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or

agency certified (FCC, UL, CE, etc.).

No License is granted under any patent right or other intellectual property whatsoever. LT C assumes no liability for applications assistance,

customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.

LT C currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.

Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and

observe good laboratory practice standards. Common sense is encouraged.

This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LT C applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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