Linear Technology LTC3839EUH Quick setup guide

dc1632af

DEMO MANUAL DC1632A

DESCRIPTION

LTC3839EUH

Fast Transient

Step-Down DC/DC Converter

Demonstration circuit 1632A is a single output 1.5V/40A

dual phase synchronous buck converter operating with

a switching frequency of 300kHz over an input voltage

range of 4.5V to 14V. The controlled on-time valley current

mode architecture of the LTC3839 allows for a fast load

step response (see Figure 4). The load step response can

be tested with the on-board load step circuit and a bench

pulse generator.

Other features of the board include remote sensing, sel-

ectable light load operating modes of forced continuous

mode (FCM) and discontinuous mode (DCM), a PLLIN

pin for synchronizing to an external clock, a CLKOUT

pin, an EXTVCC pin to reduce losses in the controller, and L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

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

PERFORMANCE SUMMARY

RUN and TRACK/SS pins. Up to 12-phase operation can

be achieved by daisy-chaining the CLKOUT and PLLIN

signals of multiple boards and programming the relative

phase with the PHASMD jumper.

The demo board uses a high density, two sided drop-in

layout. The entire converter, excluding the bulk output and

input capacitors, fits within a compact 1.6˝ ×1.2˝ area

on the board. The package style for the LTC3839EUH is a

32-lead 5mm ×5mm QFN with an exposed ground pad.

Design files for this circuit board are available at

http://www.linear.com/demo

(TA= 25°C)

PARAMETER CONDITIONS VALUE

Minimum Input Voltage 4.5V

Maximum Input Voltage 14V

Output Voltage VOUT I

OUT = 0A to 40A, VIN = 4.5V to 14V 1.5V ± 2%

VOUT Maximum Output Current, IOUT VIN = 4.5V to 14V, VOUT = 1.5V 40A

Nominal Switching Frequency 300kHz

Efficiency (see Figures 2 and 3) VOUT = 1.5V, IOUT = 40A, VIN = 12V 90.7% Typical

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dc1632af

DEMO MANUAL DC1632A

QUICK START PROCEDURE

Figure 1. Proper Measurement Equipment Setup

Demonstration circuit 1632A is easy to set up to evalu-

ate the performance of the LTC3839EUH. Please refer to

Figure 1 for proper measurement equipment setup and

follow the procedure below.

1) With power off, connect the input supply, load and me-

ters as shown in Figure 1. Preset the load to 0A and VIN

supply to 0V. Place jumpers in the following positions:

JP1 RUN ON

JP3 MODE FCM

2) Adjust the input voltage to be between 4.5V and 14V.

VOUT should be 1.5V ±2%.

3) Next, apply 40A load and re-check VOUT.

4) Once the DC regulation is confirmed, observe the output

voltage ripple, load step response, efficiency and other

parameters.

Note 1. Use the BNC connector labeled VOUT to measure

the output voltage ripple.

Note 2. Do not apply the load from the VO_SNS+ pin to

the VO_SNS– pin. This may damage the converter. These

pins are only intended to monitor the voltage across the

bulk output capacitors at COUT1-4.

Load Step Testing (Optional)

Demonstration circuit 1632A provides a simple load step

circuit consisting of a MOSFET and sense resistor for each

rail. To apply a load step, follow the steps below.

1) Pre-set the amplitude of a pulse generator to 0.0V and

the duty cycle to 5% or less.

2) Connect the scope to the VOUT BNC connectors for

the rail under test with a coax cable. To monitor the

load step current, connect the scope probe across the

ISTEP± pins.

3) Connect the output of the pulse generator to the PULSE

GEN pin and connect the return to the GND pin.

4) With the converter running, slowly increase the ampli-

tude of the pulse generator output to provide the desired

load step pulse height. The scaling for the LOAD STEP

signal is 5mV/Amp.

VIN

SUPPLY IOUT

LIN

VOUT*

VIN

* MONITOR THE VOLTAGE ACROSS COUT5 FOR

ACCURATE EFFICIENCY MEASUREMENTS.

VOUT

LOAD

–

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dc1632af

DEMO MANUAL DC1632A

QUICK START PROCEDURE

Figure 2. Efficiency Curves for the DC1632A in FCM

LTC3839 1.5V/40A Converter FCM, fSW = 300kHz

0 5 10 15 20 25 30 35 40 45

EFFICIENCY (%)

LOAD CURRENT (A)

Qtop = Inﬁneon BSC050NE2LS

Qbottom = Inﬁneon BSC010NE2LS

L = Coiltronics FP1308R3-R44-R

(0.44μH, DCR = 0.18m Ω±20%)

RSENSE = 2mΩ

VIN = 12V

VIN = 5V

100

0.01 0.10 1.00 10.00 100.00

EFFICIENCY (%)

LOAD CURRENT (A)

FCM

DCM

Qtop = Inﬁneon BSC050NE2LS

Qbottom = Inﬁneon BSC010NE2LS

L = Coiltronics FP1308R3-R44-R

(0.44μH, DCR = 0.18m Ω±20%)

RSENSE = 2mΩ

Figure 3. Efficiency Curves for the DC1632A in FCM and DCM

LTC3839 1.5V/40A Converter FCM & DCM, VIN = 12V, fSW = 300kHz

Figure 4. Load Step Response of the DC1632A at VIN = 12V. COUT = 4×Sanyo

2R5TPE330M9 || 2×100μF X5R 6.3V 1206, L1, 2 = 0.44μH, fSW=300kHz

40A

20A

20μsec/DIV

LOAD STEP

10A/DIV

1.5V(AC)

50mV/DIV

106mVP-P

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dc1632af

DEMO MANUAL DC1632A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 C13, C5 CAP, X5R 1μF 16V 10% 0603 AVX 0603YD105KAT2A

2 3 C2, C7, C12 CAP, X5R 0.1μF 25V 10% 0603 AVX 06033C104KAT2A

3 2 C3, C11 CAP, X7R 1000pF 16V 0603 AVX 0603YC102KAT2A

4 1 C4 CAP, X5R 4.7μF 16V 10% 0805 AVX 0805YD475KAT2A

5 1 C6 CAP, NPO 68pF 25V 10% 0603 AVX 06033A680KAT2A

6 1 C8 CAP, X7R 470pF 16V 5% 0603 AVX 0603YC471JAT2A

7 1 C9 CAP, X5R 0.01μF 25V 10% 0603 AVX 06033C103KAT2A

8 1 CIN1 CAP, 180μF 16V SANYO 16SVP180MX

9 2 CIN3, CIN4 CAP, X5R 22μF 16V 1210 MURATA GRM32ER61C226KE20L

10 4 COUT1, COUT2, COUT3, COUT4 CAP, 330μF 2.5V SIZE 7343 SANYO 2R5TPE330M9

11 2 COUT6, COUT5 CAP, X5R 100μF 6.3V 1206 MURATA GRM31CR60J107ME 39L

12 2 D1,D2 DIODE, SCHOTTKY SOD-323 CENTRAL SEMI CMDSH-4E TR

13 2 L1,L2 IND, 0.44μH COILTRONICS FP1308R3-R44-R

14 2 Q1,Q3 MOSFET, N CHANNEL POWERPAK SO-8 INFINEON BSC050NE2LS

15 2 Q2,Q4 MOSFET, N CHANNEL POWERPAK SO-8 INFINEON BSC010NE2LS

16 3 R11, R29, R33 RES, CHIP 10k 1% 0603 VISHAY CRCW060310K0FKEA

17 1 R15 RES, CHIP 22.1k 1% 0603 VISHAY CRCW060322K1FKEA

18 1 R13 RES, CHIP 137k 1% 0603 VISHAY CRCW0603137KFKEA

19 2 R14, R12 RES, CHIP 2.2 1% 0603 VISHAY CRCW06032R20FKEA

20 1 R22 RES, CHIP 15k 1% 0603 VISHAY CRCW060315K0FKEA

21 6 R3, R7, R23, R28, R35, R25 RES, CHIP 0 0603 VISHAY CRCW06030000Z0EA

22 1 R32 RES, CHIP 100k 1% 0603 VISHAY CRCW0603100KFKEA

23 6 R4, R5, R17, R19, R26, R27 RES, CHIP 10 1% 0603 VISHAY CRCW060310R0FKEA

24 2 RS1, RS2 RES, CHIP 0.002 1W 1% 2512 VISHAY WSL25122L000FEA

25 1 U1 IC LTC3839EUH QFN 5mm ×5mm LINEAR TECH. LTC3839EUH#PBF

Additional Circuit Components

1 0 CIN2 CAP, SVP-F8, OPT

2 0 CIN5, CIN6, CIN7, CIN8 CAP, 1210, OPT

3 0 C1, C10 CAP, 0603, OPT

4 0 COUT9-COUT12 CAP, SIZE 7343, OPT

5 0 Q5-Q8 POWERPAK SO-8, OPT

6 1 Q9 N-Channel MOSFET, TO-252 VISHAY SUD50N03-12P-E3

7 0 R1, R2, R6, R16, R18, R21,

R31, R8, R9, R10, R20, R24

RES, CHIP 0603, OPT

8 1 R33 RES, CHIP 10k 1% 0603 VISHAY CRCW060310K0FKEA

9 1 R34 RES, CHIP 0.005 1W 1% 2010 VISHAY WSL20105L000FEA

Hardware

1 16 E1-E16 TESTPOINT, TURRET .095" MILL-MAX 2501-2-00-80-00-00-07-0

2 1 JP1 2mm SINGLE ROW HEADER 3 PIN SAMTEC TMM-103-02-L-S

3 2 JP3, JP2 2mm SINGLE ROW HEADER 4 PIN SAMTEC TMM-104-02-L-S

4 6 E17-E22 JACK, BANANA KEYSTONE 575-4

5 1 J1 CONN, BNC, 5PINS CONNEX 112404

6 4 (STAND-OFF) STAND-OFF, NYLON 0.25" KEYSTONE 8831 (SNAP ON)

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dc1632af

DEMO MANUAL DC1632A

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

OPTIONAL DCR

SENSE FILTER /

DIVIDER FOR

PHASE 1

4.5V - 14V

FCM

DCM

OPTIONAL DCR

SENSE FILTER /

DIVIDER FOR

PHASE 2

SYNC

60 DEG

90 DEG

OFF

120 DEG

RUN

FSW = 300kHz 1.5V / 40A

5mV / A

LOAD STEP CIRCUIT

LOAD STEP

5% DUTY CYCLE MAX

VOUT

ALL CAPACITORS ARE IN MICROFARADS, 0603.

NOTES: UNLESS OTHERWISE SPECIFIED

2. INSTALL SHUNTS ON JUMPERS AS SHOWN.

1. ALL RESISTORS ARE IN OHMS, 0603.

OPTIONAL COUT

SGND GND

VIN

INTVCC

S2+

S1+

EXTVCC

VIN

S2-

INTVCC

S1-

INTVCC

VOUT

INTVCC

VOUT

INTVCC

S2+ S2-

S1+ S1-

VOUT

SIZE

DATE:

.VER.ONCI

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, January 10, 2012

FAST TRANSIENT STEP-DOWN DC/DC CONVERTER

MIKE S.

N/A

LTC3839EUH

DEMO CIRCUIT 1632A

SIZE

DATE:

.VER.ONCI

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, January 10, 2012

FAST TRANSIENT STEP-DOWN DC/DC CONVERTER

MIKE S.

N/A

LTC3839EUH

DEMO CIRCUIT 1632A

SIZE

DATE:

.VER.ONCI

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, January 10, 2012

FAST TRANSIENT STEP-DOWN DC/DC CONVERTER

MIKE S.

N/A

LTC3839EUH

DEMO CIRCUIT 1632A

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MIKE S.PRODUCTION 11-8-112

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MIKE S.PRODUCTION 11-8-112

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

MIKE S.PRODUCTION 11-8-112

CIN5

OPT

1210

CIN5

OPT

1210

E13PULSE

GEN

E13PULSE

GEN

OPT

COUT6

100uF

6.3V

1206

COUT6

100uF

6.3V

1206

C9 0.01uFC9 0.01uF

R10

OPT

R10

OPT

CIN4

22uF

16V

1210

CIN4

22uF

16V

1210

SUD50N03-12P

C11

1nF

C11

1nF

COUT12

OPT

7343-D15T

COUT12

OPT

7343-D15T

OPT

JP2

PHASMD

JP2

PHASMD

1nF

INFINEON BSC010NE2LS

R23

E15

ISTEP+E15

ISTEP+

R26

R17

COUT10

OPT

7343-D15T

COUT10

OPT

7343-D15T

4.7uF

16V

0805

4.7uF

16V

0805

JP1JP1

1 3

E21

GND

E21

GND

R14 2.2R14 2.2

CLKOUTE5

CLKOUT

CIN1

180uF

16V

CIN1

180uF

16V

J1J1

E22E22

E20 VOUT

RS1

0.002

2512

RS1

0.002

2512

EXTVCC E7

EXTVCC

R27

R16

OPT

R16

OPT

0.44uH

OPT

7343-D15T

COUT9

OPT

7343-D15T

COUT9

TRK/SS E6

TRK/SS

R35

R13 137KR13 137K

C8470pFC8470pF

E10

GND E10

GND

COUT4

330uF

7343-D15T

2.5V

COUT4

330uF

7343-D15T

2.5V

JP3

MODE

JP3

MODE

R34

0.005

2010

R34

0.005

2010

D2 CMDSH-3D2 CMDSH-3

R21

OPT

R21

OPT

R24

OPT

R24

OPT

C13

1uF

C13

1uF

OPT

R25

R11

10K

R11

10K

CIN6

OPT

1210

CIN6

OPT

1210

0.1uF

C10

OPT

C10

OPT

E3 VIN-

INFINEON BSC050NE2LS

E19E19

D1 CMDSH-3

E17 VIN

R20 OPTR20 OPT

R31

OPT

R31

OPT

E14 GND

CIN3

22uF

16V

1210

CIN3

22uF

16V

1210

CIN7

1210

OPT

CIN7

1210

OPT

0.44uH

R8 OPTR8 OPT

CIN2

OPT

SANYO-F8

CIN2

OPT

SANYO-F8

C6 68pFC6 68pF

R29

10K

R29

10K

E11 GND

E8 VO_SNS+

E18

GND

E18

GND

C12 0.1uFC12 0.1uF

C2 0.1uFC2 0.1uF

R28 0R28 0

R18

OPT

R18

OPT

R22

15K

R22

15K

COUT3

330uF

7343-D15T

2.5V

COUT3

330uF

7343-D15T

2.5V

INFINEON BSC050NE2LS

RS2

0.002

2512

RS2

0.002

2512

LTC3839EUH

PHASEMD

MODE/PLLIN

CLKOUT

SGND

ITH

TRACK/SS

SGND 29

SENSE2- 30

SENSE2+ 31

VOUTSENSE+

VOUTSENSE-

SENSE1+

VRNG 32

PGND

SENSE1-

DTR

PGOOD

BOOST1

TG1

SW1

BG1 17

DRVCC1 18

VIN 19

PGND 20

INTVCC 21

EXTVCC 22

DRVCC2 23

BG2 24

SW2 25

TG2 26

BOOST2 27

RUN 28

COUT2

330uF

7343-D15T

2.5V

COUT2

330uF

7343-D15T

2.5V

E16

ISTEP- E16

ISTEP-

E2 VIN+

COUT5

100uF

6.3V

1206

COUT5

100uF

6.3V

1206

R32

100K

R32

100K

PLLIN E4

PLLIN

E9 VO_SNS-

OPT

RUNE1

RUN

INFINEON BSC010NE2LS

R15 22.1KR15 22.1K

1uF

R12

2.2

R12

2.2

R19

COUT1

330uF

7343-D15T

2.5V

COUT1

330uF

7343-D15T

2.5V

OPT

R33

10K

R33

10K

OPT

COUT11

OPT

7343-D15T

COUT11

OPT

7343-D15T

E12

PGOODE12

PGOOD

CIN8

1210

OPT

CIN8

1210

OPT

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dc1632af

DEMO MANUAL DC1632A

LinearTechnology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 0212 • PRINTED IN USA

DEMONSTRATION BOARD IMPORTANT NOTICE

Linear Technology Corporation (LTC) 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 LTC 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 LTC 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. LTC assumes no liability for applications assistance,

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

LTC 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 LTC applica-

tion engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

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