Linear Technology DC2479A-A User manual

1
dc2479aaf
DEMO MANUAL DC2479A-A
DESCRIPTION
LTM4650EY
Dual Phase Single 50A
DC/DC μModule Regulator
Demonstration circuit 2479A-A features the LT M
®
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

2
dc2479aaf
DEMO MANUAL DC2479A-A
QUICK START PROCEDURE
Demonstration 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. Oncetheproperoutputvoltageisestablished,adjustthe
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
loadstepcurrentamplitude.Theoutputtransientcurrent
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

3
dc2479aaf
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

4
dc2479aaf
DEMO MANUAL DC2479A-A
QUICK START PROCEDURE
70%
75%
80%
85%
90%
1 5 10 15 20 25 30 35 40 45 50
EFFICIENCY
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

5
dc2479aaf
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

6
dc2479aaf
DEMO MANUAL DC2479A-A
PARTS LIST
ITEM 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

7
dc2479aaf
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
1
1
D
D
C
C
B
B
A
A
50A
NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS AND CAPACITORS ARE 0603.
m
DYNAMIC LOAD CIRCUIT
VOUT
LTM4650EY-1
LTM4650EY
U1
ASSY
-A -B
4.5V - 15V
*
*
RUN
ON OFF
OPT 220pF
C1
OPT 4.7nF
C5
OPT
2.55K
R13
470uF OPT
COUT2,4,6,8 COUT1,3,5,7
100uF 330uF
COUT11,13
100uF
OPT
COUT12,14
100uF 330uF
PGOOD RUN TRACK
VFB PGOOD COMP RUN TRACK DIFFP DIFFN
VFB COMP
VIN
INTVCC
VOUT
VO+
VO-
VO+
INTVCC
VO+ VO-
VOUT
VIN
VOUT
REVISION HISTORY
DESCRIPTION DATE
APPROVED
ECO REV
PRODUCTION
-
2 ST 05-12-16
REVISION HISTORY
DESCRIPTION DATE
APPROVED
ECO REV
PRODUCTION
-
2 ST 05-12-16
REVISION HISTORY
DESCRIPTION DATE
APPROVED
ECO REV
PRODUCTION
-
2 ST 05-12-16
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone]
Milpitas, CA 95035 Phone: [phone]
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
2
DEMO CIRCUIT DC2479A(A/B)
Thursday, May 12, 2016
11
HIGH EFFICIENCY, DUAL PHASE, SINGLE OUTPUT
N/A
LTM4650EY / LTM4650EY-1
ST
STEP-DOWN POWER MODULE REGULATOR
LT
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone]
Milpitas, CA 95035 Phone: [phone]
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
2
DEMO CIRCUIT DC2479A(A/B)
Thursday, May 12, 2016
11
HIGH EFFICIENCY, DUAL PHASE, SINGLE OUTPUT
N/A
LTM4650EY / LTM4650EY-1
ST
STEP-DOWN POWER MODULE REGULATOR
LT
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone]
Milpitas, CA 95035 Phone: [phone]
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
2
DEMO CIRCUIT DC2479A(A/B)
Thursday, May 12, 2016
11
HIGH EFFICIENCY, DUAL PHASE, SINGLE OUTPUT
N/A
LTM4650EY / LTM4650EY-1
ST
STEP-DOWN POWER MODULE REGULATOR
LT
+
COUT4
* 2.5V
C1
*
+
COUT2
* 2.5V
R20 OPT 2512
COUT11 * 1210
C9
1uF
CIN5
22uF 25V
1210
R19 90.9K 1%
R13 *
E13 SW1
R9
121K
1%
R14
0 Ohm
0603
R11
1K
E18
GND
E3
VO+
E12
PHASMD
U1
VOUT1
A1
VOUT1
A2
VOUT1
A3
VOUT1
A4
VOUT1
A5
VOUT1
B1
VOUT1
B2
VOUT1
B3
VOUT1
B4
VOUT1
B5
VOUT1
C1
VOUT1
C2
VOUT1
C3
VOUT1
C4
VFB1
D5
SW1
G2
PGOOD1
G9
COMP1
E6
RUN1
F5
TRACK1
E5
VOUTS1
C5
VOUT2
A8
VOUT2
A9
VOUT2
A10
VOUT2
A11
VOUT2
A12
VOUT2
B8
VOUT2
B9
VOUT2
B10
VOUT2
B11
VOUT2
B12
VOUT2
C9
VOUT2
C10
VOUT2
C11
VOUT2
C12
VFB2
D7
SW2
G11
PGOOD2
G8
COMP2
E7
RUN2
F9
TRACK2
D8
VOUTS2
C8
VIN
M2
VIN
M3
VIN
M4
VIN
M5
VIN
M6
VIN
M7
VIN
M8
VIN
M9
VIN
M10
VIN
M11
VIN
L2
VIN
L3
VIN
L4
VIN
L5
VIN
L6
VIN
L7
VIN
L8
VIN
L9
VIN
L10
VIN
L11
VIN
K2
VIN
K3
VIN
K4
VIN
K9
VIN
K10
VIN
K11
VIN
J2
VIN
J3
VIN
J4
VIN
J9
VIN
J10
VIN
J11
GND
A6
GND
A7
GND
B6
GND
B7
GND
D1
GND
D2
GND
D3
GND
D4
GND
D9
GND
D10
GND
D11
GND
D12
GND
E1
GND
E2
GND
E3
GND
E4
GND
E10
GND
E11
GND
E12
GND
F1
GND
F2
GND
F3
GND
F10
GND
F11
GND
F12
GND
G1
GND
G3
GND
G10
GND
G12
GND
H1
GND
H2
GND
H3
GND
H4
GND
H5
GND
H6
GND
H7
GND
H9
GND
H10
GND
H11
GND
H12
GND
M12
GND
M1
GND
L12
GND
J1
GND
J5
GND
J8
GND
J12
GND
K1
GND
K5
GND
K6
GND
K7
GND
K8
GND
K12
GND
L1
SGND
C7
SGND
D6
SGND
F6
SGND
F7
SGND
G6
SGND
G7
FSET
C6
PHASMD
G4
DIFFP
E8
DIFFN
E9
CLKOUT
G5
MODE-PLLIN
F4
TEMP
J6
INTVCC
H8
EXTVCC
J7
DIFFOUT
F8
COUT1
* 6.3V 1210
JP1
1 3 2
+
CIN1 150uF
25V
C10 1uF
CIN3
22uF 25V
1210
C5
*
+
COUT6 * 2.5V
E11
EXTVCC
R1
10
E9 CLKIN
E2
VIN-
E6
RUN
E14
SW2
J4
GND
R10 OPT
R16 0.01 1W 2512
R8 OPT
COUT12 * 1210
CIN2
22uF 25V
1210
J2
0.6 - 1.8V
VOUT
R4
10K
COUT3
* 6.3V 1210
C8 1uF
+
COUT9
OPT
E7
SGND
COUT13 * 1210
+
COUT8 * 2.5V
E10
CLKOUT
CIN4
22uF 25V
1210
E8
TEMP
J3
GND
1
Q1
SUD50N04-8M8P
2
1
3
4
C11
OPT
COUT14 * 1210
C7
0.1uF
R2
121K
1%
E4
VO-
J1
VIN
1
E17
IOSTEP CLK
R3
10
E5
PGOOD
R18 10K
C4
2.2uF
10V
COUT5
* 6.3V 1210
J6
E1
VIN+
J5 IOSTEP
R12 0 Ohm
+
COUT10
OPT
COUT7
* 6.3V 1210
C3
OPT

8
dc2479aaf
DEMO MANUAL DC2479A-A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●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