Linear Technology DC1453A Guida rapida alla configurazione

dc1453af

DEMO MANUAL DC1453A

DESCRIPTION

LTM4619EV: 4.5V-28V,

Dual 4A Step-Down µModule

Regulator

Demonstrationcircuit1453AfeaturestheLTM

4619EV, the

high input voltage, high efﬁciency, high density, dual 4A

step-down power module. Deratingisnecessary for certain

VIN, VOUT, and thermal conditions. The two outputs are

interleaved with 180° phase to minimize the input ripple

and reduce the input capacitors. A minimum design only

requires the bulk input and output capacitors and voltage

setting resistors. The LTM4619EV features output voltage

tracking, power good indicator, RUN pin control, clock

synchronization and soft-start programming. Protection L, LT, LTC, LTM, Linear Technology, the Linear logo, μModule and Burst Mode are registered

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

respective owners.

BOARD PHOTO

PERFORMANCE SUMMARY

(TA= 25°C)

features include foldback current limiting and overvolt-

age protection. Burst Mode

operation or pulse skipping

mode can be selected for better light load efﬁciency. The

LTM4619 data sheet must be read in conjunction with

this demo manual for working on or modifying the demo

circuit 1453A.

Design ﬁles for this circuit board are available at

http://www.linear.com/demo

PARAMETER CONDITION VALUE

Input Voltage Range 4.5V to 28V

Output Voltage VOUT1, VOUT2 3.3V ±2%, 1.8V ±2%

Maximum Continuous Output Current Derating Is Necessary for Certain VIN, VOUT, and Thermal Conditions,

See Datasheet for Details.

4ADC for VOUT1, VOUT2

Default Operating Frequency JP2 on the 500kHz position. 500kHz

Efﬁciency of Channel 1 VIN = 12V, VOUT1 = 3.3V, IOUT1 = 4A, Switching Frequency = 500kHz. 89.4%, See Figure 3

Efﬁciency of Channel 2 VIN = 12V, VOUT2 = 1.8V, IOUT2 = 4A, Switching Frequency = 500kHz. 84.1% See Figure 3

dc1453af

DEMO MANUAL DC1453A

VIN

–

0A ~ 4A +

–

LOAD

0A ~ 4A

–

LOAD

QUICK START PROCEDURE

Demonstration circuit 1453A is an easy way to evaluate the

LTM4619. If VIN is always below 5.5V, stuff a 0Ω resistor

at R16. Do not stuff R16 if VIN is higher than 5.5V. Please

refer to Figure 1 for proper measurement equipment setup

and follow the procedure below:

1. Place jumpers in the following positions for a typical

3.3V and 1.8V application:

MODE/

CLK SEL. RUN1 FREQUENCY TRACK1 RUN2 TRACK2

CCM On 500kHz Soft-Start On Soft-Start

2. With power off, preset the loads to 0A and VIN supply

to be less than 28V. Connect the input power supply,

load and meters as shown in Figure 1.

3. Turn on the power at the input. The output voltage

between VO1+and VO1–should be 3.3V ±2%, and the

voltage between VO2+and VO2–should be 1.8V ±2%.

4. Once the proper output voltage is established, adjust

the load within the operating range and observe the

output voltage regulation, ripple voltage, efﬁciency and

other parameters.

To measure input and output ripple, please refer to Fig-

ure 2 for proper setup. Keep in mind at high switching

frequencies and/or high input voltages, lower output

voltage may not regulate properly due to the minimum

on time of the regulator. Refer to the data sheet for more

details.

5. For output voltage tracking during start-up and shut-

down, set jumpers JP3 and JP4 to EXT SIGNAL and

apply a valid voltage signal to E8 and E10.

6. To synchronize the switching frequency to an external

clock set jumper JP2 in the EXT. CLK position and the

jumper JP1 in the BURST MODE / EXT. CLK position.

Apply a valid clock signal on the CLK SYNC test point.

Figure 1. Test Setup of DC1453A

Figure 2. Proper Scope Probe Placement

for Measuring Input or Output Ripple

INPUT OR OUTPUT CAPACITOR

dc1453af

DEMO MANUAL DC1453A

QUICK START PROCEDURE

Figure 3. Measured Efﬁciency for Two Outputs on DC1453A

Figure 4. Measured Load Transient Response for VOUT1 Figure 5. Measured Load Transient Response for VOUT2

3.3V VOUT1 Efﬁciency at 500kHz Frequency 1.8V VOUT2 Efﬁciency at 500kHz Frequency

LOAD CURRENT (A)

EFFICIENCY (%)

100

30 2

dc1453 F03a

431

6VIN

12VIN

28VIN

CCM

BURST

LOAD CURRENT (A)

EFFICIENCY (%)

100

30 2

dc1453 F03b

431

6VIN

28VIN

12VIN

CCM

BURST

VIN = 12V

VOUT1 = 3.3V

CONTINUOUS CURRENT MODE (CCM)

0A TO 4A LOAD STEP ON VOUT1

COUT1 = 100μF CERAMIC (1210, X5R, 6.3V) +

22μF CERAMIC (1206, X5R, 6.3V)

dc1453 F04

IOUT1 (4A/DIV)

VOUT1 (100mV/DIV)

VIN = 12V

VOUT2 = 1.8V

CONTINUOUS CURRENT MODE (CCM)

0A TO 4A LOAD STEP ON VOUT2

COUT2 = 100μF CERAMIC (1210, X5R, 6.3V) +

22μF CERAMIC (1206, X5R, 6.3V)

dc1453 F05

IOUT2 (4A/DIV)

VOUT2 (200mV/DIV)

dc1453af

DEMO MANUAL DC1453A

PARTS LIST

ITEM QUANTITY REFERENCE PART DESCRIPTION MANUFACTURER, PART NUMBER

Required Circuit Components:

1 1 C8 Capacitor, Alum, 150μF, 35V Sanyo, 35CE150AX

2 2 C2, C3 Capacitor, X5R, 10μF, 35V, 1206 Taiyo Yuden, GMK316BJ106MA-T

3 2 C17, C20 Capacitor, X5R, 22μF, 6.3V, 1206 Taiyo Yuden, JMK316BJ226ML-T

4 2 C22, C23 Capacitor, X5R, 100μF, 6.3V, 1210 Taiyo Yuden, JMK325BJ107MM-T

5 2 C10, C13 Capacitor, NPO, 10pF, 50V, 0603 AVX, 06035A100KAT2A

6 1 C12 Capacitor, NPO, 47pF, 50V, 0603 AVX, 06035A470KAT2A

7 2 C25, C26 Capacitor, X7R, 0.1μF, 50V, 0603 TDK, C1608X7R1H104K

8 1 R2 Resistor, Chip, 2k, 1/10W, 5% Vishay, CRCW06032K00JKEA

9 1 R1 Resistor, Chip, 6.34k, 1/10W, 1% Vishay, CRCW06036K34FKEA

10 1 R3 Resistor, Chip, 19.1k, 1/10W, 1% Vishay, CRCW060319K1FKEA

11 1 R15 Resistor, Chip, 100k, 1/10W, 5% Vishay, CRCW0603100KJNEA

12 1 R4 Resistor, Chip, 48.7k, 1/10W, 1% Vishay, CRCW060348K7FKEA

13 1 U1 I.C., Dual 4A Step-Down Module Linear, Technology LTM4619EV LGA

Additional Demo Board Circuit Components:

1 1 C30 Capacitor, X5R, 1μF,35V, 0603 Taiyo Yuden, GMK107BJ105KA-T

2 0 C1, C4-C7, C9, C11,

C12, C14, C16-C18,

C19, C21, C24,

C27-C29

OPT OPT

3 1 R7 Resistor, Chip, 19.1k, 1/10W, 1% Vishay, CRCW060319K1FKEA

4 3 R5, R6, R10 Resistor, Chip, 60.4k, 1/10W, 1% Vishay, CRCW060360K4FKEA

5 2 R8, R12 Resistor, Chip, 48.7k, 1/10W, 1% Vishay, CRCW060348K7FKEA

6 0 R9, R11, R13, R14,

R16

OPT OPT

Hardware for Demo Board Only:

1 12 E1-E12 Testpoint, Turret, 0.094" Mill-Max, 2501-2-00-80-00-00-07-0

2 4 4 Corners Stand-Off, Nylon, 0.5" Keystone, 8833 (SNAP ON)

3 3 JP3, JP5, JP6 Header, 3-Pin, 1-Row, 0.079CC Samtec, TMM-103-02-L-S

4 2 JP1, JP2 Header, 4-Pin, 1-Row, 0.079CC Samtec, TMM-104-02-L-S

5 1 JP4 Header, 3-Pin, 2-Row, 0.079CC Samtec, TMM-103-02-L-D

6 6 JP1-JP6 Shunt, 0.079" Center Samtec, 2SN-BK-G

7 6 J1-J6 Banana Jack Keystone, 575-4

dc1453af

DEMO MANUAL DC1453A

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 representation

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

SCHEMATIC DIAGRAM

4 4

3 3

2 2

1 1

Circuit That Meets Customer-Supplied Specifications;

LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY

Linear Technology Has Made A Best Effort To Design A

Supplied For Use With Linear Technology Parts.

This Circuit Is Proprietary To Linear Technology And

Circuit Board Layout May Significantly Affect Circuit

Applications Engineering For Assistance.

Application. Component Substitution And Printed

However, It Remains The Customer's Responsibility To

Performance Or Reliability. Contact Linear Technology

Verify Proper And Reliable Operation In The Actual

Customer Notice

4.5V - 28V

Oscon

1210

3.3V / 4A

Max

1.8V / 4A

Max

1206

1206Poscap

RUN1

OFF

pad

FREQUENCY

EXT. CLK

LTM4619EV

780KHz

500KHz

CCM

PULSE SKIP

12101206 Poscap

,C3 ,C5 ,C7,C28

SOFT START

TRACK1

EXT. SIGNAL

,C19

MODE / CLK SEL.

BURST MODE / EXT. CLK

For 4.5V < VIN < 5.5V Stuff 0 Ohm

TRACK2

OFF

RUN2

EXT. SIGNAL

TRACK VOUT1

SOFT START

pad

4.5V - 28V, Dual 4A Step-Down Module

Demo Circuit 1453A

Linear Technology Corporation

1630 McCarthy Blvd.

Milpitas, CA. 95035

Phone (408) 432-1900

Fax (408) 434-0507 www.linear.com

11Wednesday, April 22, 2009

Title

Size Document Number Rev.

Date: Sheet of

INTVCC

VIN

VOUT2

INTVCC

VIN

INTVCCVIN

VOUT1

VIN

VOUT1

VIN

VO1-

C17

22uF

6.3V

R12

48.7K

JP2

48.7K

JP1

Opt.

1210

Opt.

0603

GND

60.4K

VIN

E10

TRACK2

R11

Opt.

0603

LTM4619EV

A10 A1

E12

E10

E11

F10

F11

F12

G10

G11

G12

H11

H12

H10

A11

A12

B10

B11

B12

C10

C11

C12

D10

D11

D12

J10

J11

J12

K10

K11

K12

L10

L11

L12

M10

M11

M12

SGND

EXTVCC

RUN2

SW2

VFB1

MODE_PLLIN

INTVCC

COMP1

VIN

VOUT1 VOUT2

PGND

SGND

PGND

SGND

PGND

TRACK2

PGOOD

RUN1

SW1

TRACK1

VOUT1

VOUT2

COMP2

VFB2

FREQ

VIN

VO1+

10uF

35V

Opt.

C21

6.3V

C14

Opt.

0603

48.7K

Opt.

0603

C29

Opt.

0603

R15

100K

C30

1uF

35V

JP3

Opt.

1206

6.34K

TRACK1

R13

Opt.

0603

C11

Opt.

0603

100uF

C22

6.3V

SW2

VOUT2

GND

100uF

C23

6.3V

SGND

C10

10pF

0603

60.4K

JP5

R14

Opt.

0603

GND

E11

PGOOD

C20

22uF

6.3V

VO2+

C16

Opt.

1210

C18

Opt.

1206

JP6

150uF

35V

VOUT1

19.1K

C13

10pF

0603

SW1

C26

0.1uF

0603

C27

Opt.

0603

VO2-

C15

Opt.

1206

JP4

1 2

3 4

5 6

E12

EXTVCC

Opt.

0603

C12

47pF

0603

R10

60.4K

GND

Opt.

C24

6.3V

R16

Opt.

0603

C25

0.1uF

0603

19.1K

CLK SYNC

dc1453af

DEMO MANUAL DC1453A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 1210 • 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 direc-

tive 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

Mouser Electronics

Authorized Distributor

Click to View Pricing, Inventory, Delivery & Lifecycle Information:

Analog Devices Inc.:

DC1453A

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