1dc2479aaf

DEMO MANUAL DC2479A-A

DESCRIPTION

LTM4650EY Dual Phase Single 50A

DC/DC μModule Regulator

Demonstration circuit 2479A-A features the LTM®4650EY, the high efficiency, high density, dual 25A, single 50A switch mode step-down power module regulator. The input voltage is from 4.5V to 15V. The output voltage is programmable from 0.6V to 1.8V. DC2479A-A is con-figured as dual-phase, single-output, which can deliver up to 50A maximum. The board designs with minimum components to demonstrate this high efficiency, high density µModule. As explained in the data sheet, output current de-rating is necessary for certain VIN, VOUT, 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.

BOARD PHOTO

thermal conditions. These features and the availability of the LTM4650EY in a compact 16mm × 16mm × 5.01mm BGA package make it ideal for use in many high-density point-of-load applications. The LTM4650 data sheet must be read in conjunction with this demo manual for working on or modifying the demo circuit DC2479A-A.

Design files for this circuit board are available at http://www.linear.com/demo/DC2479A-A

Figure 1. LTM4650/DC2479A-A Demo Board

2dc2479aaf

DEMO MANUAL DC2479A-A

QUICK START PROCEDUREDemonstration circuit DC2479A-A is easy to set up to evaluate the performance of the LTM4650EY. Please refer to Figure 1 for proper measurement setup and follow the procedure below:

1. With power off, connect the input power supply, load and meters as shown in Figure 2. Preset the load to 0A and VIN supply to 12V.

2. Turn on the power supply at the input. The output volt-age should be 1.0V ± 1.5% (0.985V~1.015V).

3. Once the proper output voltage is established, adjust the load within the operating range and observe the output

voltage regulation, output voltage ripple, efficiency and other parameters. Output ripple can be measured at J6 with BNC cables.

4. (Optional) For optional load transient test, apply an adjustable pulse signal between “IOSTEP CLK” and “GND” test point. Pulse amplitude (3V~3.5V) sets the load step current amplitude. The output transient current can be monitored at the BNC connector J5 (10mV/A). The pulse signal should have very small duty cycle (< 10%) to limit the thermal stress on the transient load circuit.

PERFORMANCE SUMMARY Specifications are at TA = 25°C

PARAMETER CONDITIONS/NOTES VALUE

Input Voltage Range 4.5V ~ 15V

Output Voltage VOUT VIN = 4.5~15V, IOUT = 0~50A 1.0V ± 1.5% (0.985V ~ 1.015V)

Maximum Continuous Output Current De-Rating is Necessary for Certain VIN, VOUT and Thermal Conditions, See Data Sheet for Detail.

50A

Default Operating Frequency 500kHz

Efficiency VIN = 12V, VOUT = 1.0V, IOUT = 50A, fSW = 500 kHz 86.6%, See Figure 4

Load Transient VIN = 12V, VOUT = 1.0V, ISTEP = 25A to 37.5A < 60mVP-P, See Figure 5

3dc2479aaf

DEMO MANUAL DC2479A-A

QUICK START PROCEDURE+ –

LOAD (0A ~ 50A)1mΩ

VOUT

VIN 4.5V-15V

+ –

+– + –

+ –

dc2479aa F02

Figure 2. Test Setup of DC2479A-A

Figure 3. Measuring Output Voltage Ripple

+ –

VOUT GND

COUT

4dc2479aaf

DEMO MANUAL DC2479A-A

QUICK START PROCEDURE

70%

75%

80%

85%

90%

1 5 10 15 20 25 30 35 40 45 50

EFFI

CIEN

CY

LOAD CURRENT dc2479 F04

Figure 4. Efficiency vs Load Current at VIN = 12V, VO = 1V, fSW = 500kHz

Figure 5. Measured 25A – 37.5A Load Transient Response (VIN = 12V, VOUT = 1.0V, fSW = 500kHz)

VO (20MHz BW) [20mV/DIV, AC COUPLED]

25A-37.5A LOAD STEP

dc2479 F05

5dc2479aaf

DEMO MANUAL DC2479A-A

QUICK START PROCEDURE

Figure 6. Output Voltage Ripple at VIN = 12V, VOUT = 1V, IOUT = 50A, fSW = 500kHz

Figure 7. Thermal Performance at VIN = 12V, VOUT = 1V, IOUT = 50A, TA = 23.8°C, No Air Flow

VOUT (20MHz BW) [10mV/DIV

dc2479 F06

6dc2479aaf

DEMO MANUAL DC2479A-A

PARTS LISTITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 1 CIN1 CAP., 150µF, 25V, Aluminum Electr., SUN ELECT., 25CE150AX

2 4 CIN2, CIN3, CIN4, CIN5 CAP., X5R, 22µF, 25V, 10%, 1210 MURATA, GRM32ER61E226KE15L

3 4 COUT2, COUT4, COUT6, COUT8 CAP., 470µF, 2.5V, POSCAP, F8 SANYO-D4D PANASONIC, 2R5TPF470M6L

4 1 C4 CAP., X5R, 2.2µF, 10V, 10%, 0603 MURATA, GRM188R61A225KE34D

5 1 C7 CAP., X5R, 0.1µF, 25V, 10%, 0603 AVX, 06033D104KAT2A

6 3 C8, C9, C10 CAP., X7R, 1µF, 10V,10%, 0603 AVX, 0603ZC105KAT2A

7 1 Q1 XSTR, SUD50N04-8M8P-4GE3 MOSFET VISHAY, SUD50N04-8M8P-4GE3

8 2 R1, R3 RES., 10, 1%,1/10W, 0603 VISHAY, CRCW060310R0FKEA

9 2 R2, R9 RES., 121k, 1%,1/10W, 0603 VISHAY,CRCW0603121KFKEA

10 2 R4, R18 RES., 10k, 1%,1/10W, 0603 VISHAY, CRCW060310K0FKEA

11 1 R11 RES., 1k, 1%,1/10W, 0603 VISHAY, CRCW06031K00FKEA

12 1 R16 RES., 0.01Ω, 1W, 2512 VISHAY, WSL2512R0100FEA

13 1 R19 RES., 90.9k, 1%,1/10W, 0603 VISHAY, CRCW060390K9FKEA

14 1 U1 LTM4650EY#PBF, 16×16×5.01 BGA LINEAR TECH., LTM4650EY#PBF

Additional Demo Board Circuit Components

1 8 COUT1, COUT3, COUT5, COUT7, COUT11, COUT12, COUT13, COUT14

CAP., X5R, 100µF, 6.3V, 20%,1210 AVX, 12106D107MAT2A

2 0 COUT9, COUT10 CAP., OPT, SANYO-D4D OPT

3 0 C1, C3, C5, C11 CAP., OPT, 0603 OPT

4 0 R8, R10 RES., OPT, 0603 OPT

5 2 R12, R14 RES., 0Ω,1/10W, 0603 VISHAY, CRCW06030000Z0EA

6 0 R13 RES., OPT, 0603 OPT

7 0 R20 RES., OPT, 2512 OPT

Hardware: For Demo Board Only

1 9 E1-E7, E17, E18 TESTPOINT, TURRET, .094" MILL-MAX, 2501-2-00-80-00-00-07-0

2 0 E8-E14 TESTPAD SMD TESTPAD SMD

3 1 JP1 HEADER, 3 PIN 2mm SINGLE ROW WURTH ELEKTRONIK, 620-003-111-21

4 2 J1, J3 JACK BANANA KEYSTONE, 575-4

5 2 J2, J4 STUD, TESTPIN PEM KFH-032-10

6 4 J2, J4 (×2) NUT, BRASS 10-32 ANY #10-32

7 2 J2, J4 RING, LUG #10 KEYSTONE #10

8 2 J2, J4 WASHER, TIN PLATED BRASS ANY #10

9 2 J5, J6 CONN, BNC, 5 PINS CONNEX 112404

10 1 XJP1 SHUNT 2mm WURTH ELEKTRONIK, 608-002-134-21

7dc2479aaf

DEMO MANUAL DC2479A-A

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

5 5

4 4

3 3

2 2

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ULA

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LT

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C1 *

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* 2.5V

R20

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T25

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CIN

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VOUT1A1VOUT1A2VOUT1A3VOUT1A4VOUT1A5VOUT1B1VOUT1B2VOUT1B3VOUT1B4VOUT1B5VOUT1C1VOUT1C2VOUT1C3VOUT1C4

VFB1

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VIN

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VIN

M3

VIN

M4

VIN

M5

VIN

M6

VIN

M7

VIN

M8

VIN

M9

VIN

M10

VIN

M11

VIN

L2VI

NL3

VIN

L4VI

NL5

VIN

L6VI

NL7

VIN

L8VI

NL9

VIN

L10

VIN

L11

VINK2 VINK3 VINK4 VINK9 VINK10 VINK11

VINJ2 VINJ3 VINJ4 VINJ9 VINJ10 VINJ11

GN

DA6

GN

DA7

GN

DB6

GN

DB7

GN

DD1

GN

DD2

GN

DD3

GN

DD4

GN

DD9

GN

DD1

0G

ND

D11

GN

DD1

2G

ND

E1

GND E2GND E3GND E4GND E10GND E11GND E12GND F1GND F2GND F3GND F10GND F11GND F12GND G1GND G3GND G10GND G12GND H1GND H2GND H3GND H4GND H5GND H6GND H7GND H9GND H10GND H11GND H12

GND M12GND M1GND L12

GND J1GND J5GND J8GND J12GND K1GND K5GND K6GND K7GND K8GND K12GND L1

SGND C7SGND D6SGND F6SGND F7SGND G6SGND G7

FSET

C6

PHAS

MD

G4

DIF

FPE8

DIF

FNE9

CLKOUTG5

MODE-PLLINF4

TEMPJ6

INTV

CC

H8

EXTV

CC

J7

DIF

FOU

TF8

CO

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* 6.3V

1210

JP1

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CLK

IN

E2

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SW

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R10

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R16

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R8

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* 1210

CIN

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V12

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J2

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R4 10K

CO

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* 6.3V

1210

C8

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* 1210

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* 2.5V

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422

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1

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C11

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* 1210

C7

0.1u

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IN1

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CLK

R3 10

E5

PG

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R18

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C4

2.2u

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CO

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1210

J6

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VIN

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STE

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R12

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T10

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T

CO

UT7

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1210

C3

OP

T

8dc2479aaf

DEMO MANUAL DC2479A-A

Linear Technology Corporation1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 2016

LT 0616 • 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 application engineer.

Mailing Address:

Linear Technology

1630 McCarthy Blvd.

Milpitas, CA 95035

Copyright © 2004, Linear Technology Corporation