Linear Technology DC1669A Quick setup guide

dc1669af

DEMO MANUAL DC1669A

DESCRIPTION

LTM4627EV:

15A Step-Down µModule

Regulator

Demonstration circuit 1669A features the LTM

4627EV

μModule

regulator, a high performance high efﬁciency

step-down regulator. The LTM4627EV has an operating

input voltage range of 4.5V to 20V and is able to provide

an output current of up to 15A. The output voltage is pro-

grammable from 0.6V to 5V and can be remotely sensed

with the internal optional differential remote sensing

ampliﬁer. The LTM4627EV is a complete DC/DC point-of-

load regulator in a thermally enhanced 15mm ×15mm ×

4.32mmLGApackagerequiringonlyafewinputandoutput

capacitors. This regulator is internally compensated and

employs constant frequency current mode architecture,

enabling a fast transient response and stable control

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

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

respective owners.

BOARD PHOTO

PERFORMANCE SUMMARY

loop over a wide range of output capacitance. It supports

frequency synchronization and Burst Mode

operation for

increased light-load efﬁciency. Output voltage tracking

is also available through the TRACK/SS pin for supply

rail sequencing. The LTM4627 data sheet must be read

in conjunction with this demo manual for working on or

modifying demo circuit 1669.

Design ﬁles for this circuit board are available at

http://www.linear.com/demo

PARAMETER CONDITIONS / NOTES VALUE

Input Voltage Range 4.5V to 20V

Output Voltage, VOUT Jumper Selectable 1.0VDC, 1.2VDC, 1.5VDC, 2.5VDC, 1.8VDC, 3.3VDC

Maximum Continuous Output Current Derating is Necessary for Certain Operating

Conditions. See Data Sheet for Details

15A DC

Default Operating Frequency 500kHz

External Clock Synchronous Frequency Range 250kHz to 770kHz

Efﬁciency VIN = 12V, VOUT = 1.8V, IOUT = 15A 86.6%, See Figure 2

dc1669af

DEMO MANUAL DC1669A

QUICK START PROCEDURE

Figure 1. Test Setup of DC1669A

Demonstration circuit 1669 is easy to set up to evaluate the

performance of the LTM4627EV. Please refer to Figure 1

for test setup connections and follow the procedure below.

1. With power off, place the jumpers in the following

positions for a typical 1.8Vout application:

JP1 JP2 JP3 JP4

TRACK/SS RUN MODE VOUT Select

SOFTSTART ON CCM 1.8V

2. Before connecting input supply, load and meters, preset

the input voltage supply to be less than 20V. Preset the

load current to 0A.

3. With power off, connect the load, input voltage supply

and meters as shown in Figure 1.

4. Turn on input power supply. The output voltage meter

should display the selected output voltage ± 2%.

5. Once the proper output voltage is established, adjust

the load current within the 0A to 15A range and observe

the load regulation, efﬁciency and other parameters.

Output voltage ripple should be measured at J4 with a

BNC cable and oscilloscope.

6. To observe increased light load efﬁciency place the

Mode pin jumper (JP3) in the Burst Mode position. To

observe increased light load efﬁciency with a reduced

output ripple ascomparedto Burst Modeoperation place

the MODE pin jumper in the pulse-skipping position.

7. For optional load transient testing apply an adjustable

positive pulse signal between IOSTEP CLK and GND

pins. The pulse amplitude sets the load step current

amplitude. The pulse width should be short (<1μs)

and pulse duty cycle should be low (<15%) to limit the

thermal stress on the load transient circuit. The load

step current can be monitored with a BNC connected

to J3 (15mV/A).

Note:

To set the output voltage to 5V turn off the input supply

power, apply the following changes listed below.

R7 R6 R12 JP4

Remove 0Ω 8.25k (1%) 1V

+–

–+

–

VIN

–

LOAD

0A TO

15A

dc1669af

DEMO MANUAL DC1669A

QUICK START PROCEDURE

Figure 2. Measured Supply Efﬁciency at 12VIN and 18VIN

VOUT

100mV/DIV

IOUT(STEP)

3.33A/DIV

50μs/DIV DC1669A F03

VIN (V) VOUT (V) COUT BULK COUT CERAMIC OTHER

12 1.8 330μF/6.3V

POSCAP

2 ×100μF, 6.3V C10 = 47pF

C19 = 330pF

Figure 3. Measured Load Transient Response

(7.5A to 15A Load Step)

Figure 4. Measured Thermal Capture

VIN (V) VOUT (V) IOUT (A) AIRFLOW AMBIENT (°C)

12 1.8 15 Natural

Convection

LOAD CURRENT (A)

EFFICIENCY (%)

246810

DC1669 F02a

12 14

18VIN

fSW = 500kHz

3.3VOUT

2.5VOUT

1.8VOUT

1.5VOUT

1.2VOUT

1VOUT

LOAD CURRENT (A)

EFFICIENCY (%)

246810

DC1669 F02b

12 14

12VIN

fSW = 500kHz

3.3VOUT

2.5VOUT

1.8VOUT

1.5VOUT

1.2VOUT

1VOUT

dc1669af

DEMO MANUAL DC1669A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 C5 CAP, 1210 22μF 10% 25V X5R MURATA GRM32ER61E226KE15L

3 1 C10 CAP, 0603 150pF 10% 25V NPO AVX 06033A151KAT2A

4 2 C11, C12 CAP, 1210 100μF 20% 6.3V X5R TAIYOYUDEN JMK325BJ107MM-T

5 1 C16 CAP, 7343 330uF 20% 6.3V POSCAP SANYO 6TPF330M9L

6 1 C19 CAP, 0603 82pF 5% 25V NPO AVX 06033A820JAT2A

7 1 R7 RES, 0603 0Ω JUMPER VISHAY CRCW06030000Z0ED

8 1 R9 RES, 0603 124k 5% 1/10W VISHAY CRCW0603124K0JNEA

9 1 R15 RES, 0603 30.1k 1% 1/10W VISHAY CRCW060330K1FKEA

10 2 R18, R19 RES, 0603 10Ω 5% 1/10W VISHAY CRCW060310R0JNEA

11 1 U1 IC, MICRO MODULE LINEAR TECH LTM4627EV

Additional Demo Board Circuit Components

1 1 C6 CAP, 150μF 35V ALUM SUNCON ELEC 35CE150AX

2 0 C3, C4, C13, C22, C23 CAP, 1210 OPTION OPTION

3 0 C7 CAP, 0805 OPTION OPTION

4 0 C14, C15, C17, C20, C21 CAP, 0603 OPTION OPTION

5 1 Q1 XSTR, MOSFET, N-CHANNEL 30V VISHAY SUD50N03-09P

6 4 R5, R6, R8, R11 RES, 0603 OPTION OPTION

7 3 C1, C2, C8 CAP, 0603 1μF 20% 10V X5R TAIYO YUDEN LMK107BJ105MA-T

8 1 C9 CAP, 0603 0.1μF 10% 50V X7R TDK C1608X7R1H104K

9 1 C18 CAP, 0603 1.5nF 5% 25V X7R AVX 06033A152JAT2A

10 1 R1 RES, 0603 10k 5% 1/10W VISHAY CRCW060310K0JNEA

11 1 R2 RES, 2512 0.015Ω 1% 1W VISHAY WSL2512R0150FEA

12 2 R3, R13 RES, 0603 60.4k 1% 1/10W VISHAY CRCW060360K4FKEA

13 2 R4, R12 RES, 0603 90.9k 1% 1/10W VISHAY CRCW060390K9FKEA

14 1 R10 RES. 0603 20k 5% 1/10W VISHAY CRCW060320K0JNEA

15 1 R14 RES, 0603 40.2k 1% 1/10W VISHAY CRCW060340K2FKEA

16 1 R16 RES, 0603 19.1k 1% 1/10W VISHAY CRCW060319K1FKEA

17 1 R17 RES, 0603 13.3k 1% 1/10W VISHAY CRCW060313K3FKEA

18 1 R20 RES. 0603 100k 5% 1/10W VISHAY CRCW0603100KJNEA

Hardware

1 10 E1-E3, E5-E11 TURRET MILL-MAX 2501-2-00-80-00-00-07-0

2 4 JP1, JP2, JP3, JP4 SHUNT SAMTEC 2SN-BK-G

3 2 JP1, JP2 HEADER, 3-PIN, 2mm SAMTEC TMM-103-02-L-S

4 1 JP3 HEADER, 4-PIN, DOUBLE ROW, 2mm SAMTEC TMM-104-02-L-D

5 1 JP4 HEADER, 6-PIN, DOUBLE ROW, 2mm SAMTEC TMM-106-02-L-D

6 4 J1, J2, J5, J6 JACK, BANANA KEYSTONE 575-4

7 2 J3, J4 CONN., VERT. PC-MNT, BNC 50Ω CONNEX 112404

8 4 STANDOFF, SNAP ON KEYSTONE_8834

dc1669af

DEMO MANUAL DC1669A

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

However, no responsibility is assumed for its use. LinearTechnology Corporation makes no representation

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

SCHEMATIC DIAGRAM

dc1669af

DEMO MANUAL DC1669A

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

LT 1110 • 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

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