Linear Technology LTM4649EY Quick setup guide

dc1856a-bf

DEMO MANUAL DC1856A-B

DESCRIPTION

LTM4649EY

10A Step-Down µModule

Regulator

Demonstration circuit 1856A-B features the LT M

4649EY

µModule

regulator, a high performance, high efficiency

step-down regulator. The LTM4649EY has an operating

input voltage range of 4.5V to 16V and is able to provide

an output current of up to 10A. The output voltage is pro-

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

with the internal differential remote sensing amplifier. The

LTM4649EY is a complete DC/DCpoint-of-load regulator in

a thermally enhanced 15mm ×9mm ×5.01mm BGA pack-

age requiring onlya few input andoutput capacitors. Output

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.

PERFORMANCE SUMMARY

BOARD PHOTO

voltage tracking is available through the TRACK/SS pin for

supply rail sequencing. External clock synchronization is

also available through the CLKIN pin. The LTM4649 data

sheet must be read in conjunction with this demo manual

prior to working on or modifying demo circuit 1856A-B.

Design files for this circuit board are available at

http://www.linear.com/demo

(TA= 25°C)

PARAMETER CONDITIONS/NOTES VALUE

Input Voltage Range 4.5V to 16V

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

Maximum Continuous Output Current Derating is Necessary for Certain Operating

Conditions. See Data Sheet for Details

10ADC

Default Operating Frequency 450kHz

External Clock Synchronous Frequency Range 250kHz to 780kHz

Efficiency VIN = 12V, VOUT = 1.8V, IOUT = 10A 89% See Figure 2

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DEMO MANUAL DC1856A-B

QUICK START PROCEDURE

Figure 1. Test Setup of DC1856A-B

Demonstration circuit 1856A-B is an easy way to evaluate

the performance of the LTM4649EY. 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:

JP8 JP7 JP9 JP2

TRACK/SS RUN MODE VOUT Select

SS ON CCM 1.8V

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

the input voltage supply to be between 4.5V to 16V.

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 10A range and observe

the load regulation, efficiency, and other parameters.

Output voltage ripple should be measured at J6 with a

BNC cable and oscilloscope.

6. To observe increased light load efficiency place the

Mode pin jumper (JP9) in the Burst Mode

position. To

observe increased light load efficiency with a reduced

output ripple ascompared to BurstMode operation 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 (<1ms)

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 J5 (10mV/A).

Note: To evaluate PGOOD pin operation for the LTM4649,

insert a 100k resistor between PGOOD and INTVCC. Do

not stuff R15.

–

A–

LOAD

0A TO 10A

VIN

+ –

V+

–

dc1856a-bf

DEMO MANUAL DC1856A-B

QUICK START PROCEDURE

Figure 2. Measured Supply Efficiency at5VIN and 12VIN

VIN (V) VOUT (V) COUT CERAMIC

12 1.5 2 ×220µF/4V Ceramic

Figure 3. Measured Load Transient Response

(5A to 10A Load Step)

VIN (V) VOUT (V) IOUT (A) AIRFLOW AMBIENT (ºC)

12 1.5 10 Natural Convection 29.7

Figure 4. Measured Thermal Capture

VOUT = 100mV/DIV

IOUT STEP = 5A/DIV

dc1856a-bf

DEMO MANUAL DC1856A-B

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 2 CO4, CO5 CAP, 100µF 20% 6.3V X5R 1210 AVX 12106D107MAT2A

2 1 CO2 CAP, 22µF 20% 6.3V X5R 1210 AVX 12106D226MAT2A

3 1 CIN1 CAP, 22µF 20% 16V X7R 1210 MURATA, GRM32ER71C226KE18L

4 1 CIN3 CAP, 150µF 10% 25V OS-CON SANYO, 25HVH150MT

5 2 CIN4, CIN5 CAP, 22µF 20% 16V X5R 1206 TAIYO YUDEN, EMK316BJ226ML-T

6 2 R22, R23 RES, 0603 10Ω 5% 1/10W VISHAY CRCW060310R0JNEA

7 1 R19 RES, 0603 1% 1/10W OPTION

8 1 C1 CAP, 0.1µF 20% 25V X7R 0603 AVX 06033C104MAT2A

9 1 C3 CAP, 2.2µF 20% 10V X5R 0603 TAIYO YUDEN LMK107BJ225MA-T

10 1 U1 I.C., LOW VOLTAGE POWER MODULE LINEAR TECH. LTM4649

Additional Demo Board Circuit Components

1 0 CO7 CAP, OPTION POSCAP 7343 OPTION

2 0 CO1, CO3, CO6 CAP, OPTION 1210 OPTION

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

4 0 C4, C5, CTHP, CP, CFF CAP, OPTION 0603 OPTION

5 1 R11 RES, 2512 0.01Ω 5% 1W PANASONIC ERJ-M1WSF10MU

6 2 R10, RS, R14 RES, 0603 10k 1% 1/10W VISHAY CRCW060310K0FKEA

7 1 R16 RES, 0603 20k 5% 1/10W VISHAY CRCW060320K0JNEA

8 2 R17, R18 RES, 0603 51Ω 5% 1/10W VISHAY CRCW060351R0JNEA

9 1 R15 RES, 0603 OPTION OPTION

10 1 R1 RES, 0603 4.99k 1% 1/10W VISHAY CRCW06034K99FKEA

11 1 R2 RES, 0603 6.65k 1% 1/10W VISHAY CRCW06036K65FKEA

12 1 R3 RES, 0603 3.16k 1% 1/10W VISHAY CRCW06033K16FKEA

13 1 R4 RES, 0603 2.21k 1% 1/10W VISHAY CRCW06032K21FKEA

14 0 R5, R7, R8, R9, R12, R13, R20, R21, R24 RES, 0603 OPTION OPTION

15 2 R6,R25 RES, 0603 0Ω JUMPER VISHAY CRCW06030000Z0EA

16 1 Q14 XSTR, SUD50N03-09P MOSFET SILICONIX SUD50N03-09P-GE3

Hardware

1 10 E1-E10 TESTPOINT TURRET 0.094" MILL MAX 2501-2-00-80-00-00-07-0

2 6 JP1, JP2, JP3, JP4, JP5, JP6 HEADER, 2-PIN, 2mm SAMTEC TMM 102-02-L-S

3 2 JP7, JP8 HEADER, 3-PIN, 2mm SAMTEC TMM-103-02-L-S

4 1 JP9 HEADER, 3X2 2mm SAMTEC TMM-103-02-L-D

5 4 J1, J2, J3, J4 JACK, BANANA KEYSTONE 575-4

6 2 J5, J6 CONN, BNC, 5 PINS CONNEX 112404

7 4 XJP1, XJP7, XJP8, XJP9 SHUNT, 2mm SAMTEC 2SN-BK-G

8 4 STANDOFF, SNAP ON KEYSTONE_8834

dc1856a-bf

DEMO MANUAL DC1856A-B

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

dc1856a-bf

DEMO MANUAL DC1856A-B

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

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

 LINEAR TECHNOLOGY CORPORATION 2013

LT 0413 • 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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