Linear Technology DC1385A Quick setup guide

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DEMO MANUAL DC1385A
DESCRIPTION
LTM4614EV: Dual 4A
Step-Down µModule
®
Regulator
Demonstration circuit DC1385A features the LTM
®
4614EV,
thehighefficiency, high density power module with dual 4A
switchmode outputs. Derating is necessaryfor certain VIN,
VOUT, and thermal conditions. In the default configuration,
thetwo outputs share the same input supply, howevereach
regulator may have its own input supply simply by remov-
ing a resistor. By enabling the tracking feature, the outputs L, LT, LTC, LTM, μModule, 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
coincidentally follow anothersupplyrail.The LTM4614 data
sheet must be read in conjunction with this demo board
prior to working on or modifying demo circuit DC1477A.
Design files for this circuit board are available at
http://www.linear.com/demo
(TA= 25°C)
PARAMETER CONDITIONS VALUE
Input Voltage Range VIN1 and VIN2 2.375V to 5.5V
Output Voltage VOUT1, VOUT2 VIN = 5VDC,
IOUT1, IOUT2 = 4A.
VOUT1 = 1.8V ±2%,
VOUT2 = 1.2V ±2%
Maximum Continuous Output Current Derating is Necessary for Certain VIN, VOUT, and Thermal
Conditions, See Data Sheet for Details
4ADC for VOUT1, VOUT2
Default Operating Frequency 1.25MHz
Efficiency of Channel 1 VIN1 = 5V, VOUT1 = 1.8V, IOUT1 = 4A 81.5%, See Figure 3
Efficiency of Channel 2 VIN2 = 5V, VOUT2 = 1.2V, IOUT2 = 4A 75.4%, See Figure 3

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DEMO MANUAL DC1385A
QUICK START PROCEDURE
Demonstration circuit DC1385A is an easy way to evalu-
ate the performance of the LTM4614EV. 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
1.8V and 1.2V application:
TRACK1 RUN1 RUN2
DISABLED ON ON
2. With the power off, connect the input power supply,
load and meters as shown in Figure 1. Preset the loads
to 0A and VIN supply to be less than 5.5V.
3. Turn on the power at the input. The output voltage
between VO1+and VO1–should be 1.8V ± 2%, and the
voltage between VO2+and VO2–should be 1.2V ±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 Figure 2 for proper setup.
5. Channel 1 can track another supply by connecting TP17,
TRACK to another supply and setting JP1 to ENABLED.
Resistors R8 and R9 are set up for coincidental tracking.
Channel 2 is set up to coincidentally track the output
of channel 1 by resistor R6 and R7. Please refer to the
circuit schematic and data sheet.
6. Because DC1385A is assembled in a way that VOUT2
tracks VOUT1 automatically, placing the JP2 (RUN1) to
OFF position turns off both outputs. To disable track-
ing function of VOUT2, please remove R6 and R7 and
connect TRACK2 to VIN2.
7. VIN1 and VIN2 are shorted on DC1385A through a
1mohm resistor, R10. If desired, remove R10 and dif-
ferent supplies can be applied to VIN1 and VIN2 of this
demo circuit.

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DEMO MANUAL DC1385A
QUICK START PROCEDURE
Figure 1. Test Setup of DC1385A
Figure 2. Proper Scope Probe Placement for Measuring Input or Output Ripple
+–
V
LOAD
–+
A
+–
V
LOAD
–+
A
0 ~ 4A
–+
+–
A
VIN
0 ~ 4A
–+
V
+–
INPUT OR OUTPUT CAPACITOR

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DEMO MANUAL DC1385A
Figure 3. Measured Efficiency for Different Channels
QUICK START PROCEDURE

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DEMO MANUAL DC1385A
Figure 4. Measured Load Transient Response for VOUT1
Figure 5. Measured Load Transient Response for VOUT2
QUICK START PROCEDURE
VOUT1 (20mV/DIV)
IOUT1 STEP (2A/DIV)
VIN1 = 5V
VOUT1 =1.8V
CONTINUOUS CURRENT MODE (CCM)
1A TO 4A LOAD STEP ON VOUT1
COUT1 = 100μF CERAMIC (1210, X5R, 6.3V) + 22μF CERAMIC (1206, X5R, 6.3V)
VOUT2 (20mV/DIV)
IOUT2 STEP (2A/DIV)
VIN2 = 5V
VOUT2 =1.2V
CONTINUOUS CURRENT MODE (CCM)
1A TO 4A LOAD STEP ON VOUT2
COUT2 = 100μF CERAMIC (1210, X5R, 6.3V) + 22μF CERAMIC (1206, X5R, 6.3V)

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DEMO MANUAL DC1385A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 2 CIN1, CIN7 CAP., OSCON 120uF, 10V, E7 SANYO, 10SVP120M
2 4 CIN3, CIN4, CIN5, CIN6 CAP., X5R, 10μF, 6.3V, 20%, 1206 AVX, 12066D106MAT2A
3 2 CO3, CO8 CAP., X5R, 22μF, 6.3V, 20%, 1206 AVX, 12066D226MAT2A
4 2 CO1, CO9 CAP., X5R, 100μF, 6.3V, 20%, 1210 AVX, 12106D107MAT2A
5 1 RSET1 RES., CHIP, 4.02k, 1/16W, 1%, 0402 VISHAY, CRCW04024K02FKED
6 1 RSET2 RES., CHIP, 10.0k, 1/16W, 1%, 0402 VISHAY, CRCW040210K0FKED
7 2 R2, R1 RES., CHIP, 100k, 1/16W, 1%, 0402 VISHAY, CRCW0402100KFKED
8 1 U1 I.C. LTM4614EV 144 PIN LGA LINEAR TECH., LTM4614EV
Additional Demo Board Circuit Components
1 0 CPP1, CFF1, CPP2, CFF2 CAP., 0402, OPT
2 0 CIN2, CIN8, CO11, CO12 CAP., 1206, OPT
3 0 CO2, CO4, CO5, CO6, CO7, CO10 CAP., 7343, OPT CAP7343
4 0 C1, C2, C3, C4 CAP., 0402, OPT
5 1 R9 RES., CHIP, 4.02k, 1/16W, 1%, 0402 VISHAY, CRCW04024K02FKED
6 1 R7 RES., CHIP, 10.0k, 1/16W, 1%, 0402 VISHAY, CRCW040210K0FKED
7 2 R8, R6 RES., CHIP, 4.99k, 1/16W, 1%, 0402 VISHAY, CRCW04024K99FKED
8 1 R10 RES., CHIP, 1mΩ, 1W, 5%, 2512 PANASONIC, ERJM1WTJ1M0V
Hardware-For Demo Board Only
1 3 JP1, JP2, JP3 HEADER 3 PIN 0.079 SINGLE ROW SAMTEC, TMM103-02-L-S
2 3 JPX1, JPX2, JPX3 SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G
3 13 TP1, TP3, TP7-9, TP12, TESTPOINT, TURRET, 0.094" PBF MILL-MAX, 2501-2-00-80-00-00-07-0
TP14, TP16-20, TP23
4 8 TP2, TP6, TP10, TP11, TP13, JACK BANANA KEYSTONE, 575-4
TP15, TP21, TP22
5 4 (STAND-OFF) STAND-OFF, NYLON 0.50" KEYSTONE, 8833(SNAP ON)

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DEMO MANUAL DC1385A
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
VIN1+
VIN1-
VIN1 GND
2.375V - 5.5V
PGOOD1
TRACK1
DISABLED ENABLED
ON
OFF
TRACK
GND2 GND1
VOUT1 GND1
VO1+ VO1-
1.8V @ 4A MAX
PGOOD2
RUN2
ON OFF
1.2V @ 4A MAX
GND2
VO2-
VO2+
VOUT2
RUN1
2.375V - 5.5V
VIN2-
VIN2
VIN2+
GND
T
TT T
3
DC1385A
Thursday, June 05, 2008
11
Antonina 3/7/07 J. Sun 3/7/07
High Density Dual Step-Down Power Module
LTM4614EV
SIZE
SCALE:
CAGE CODE DWG NO REV
SHEET OF
FILENAME:
TITLE
CONTRACT NO.
APPROVALS DATE
DRAWN
CHECKED APPROVED
ENGINEER
TECHNOLOGY
1630 McCarthy Blvd. Milpi tas, CA 95035 Phone: [phone] Fax: [phone]
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETSCUSTOMER-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.
CUSTOMER NOTICE
VIN1
SW1 SW2
VOUT1
VIN2
VIN1
VOUT2
VOUT1 VOUT2
VIN1
VOUT1
VOUT1
VOUT2
VIN2
TP11
+
CIN7
120uF 10V
R7
10.0K
1%
CO10
OPT
CFF2 OPT
OPT C2
RSET1
4.02K
TP18
CIN8 OPT
CIN3 10uF
6.3V
TP22
CIN2 OPT
TP12
CO1
100uF
6.3V
JP2
1
2
3
R8
4.99K
TP19
TP5
LTM4614EV U1
G1
G2
G3
G4
G5
L2
G6
G7
G8
G9
G10
G11
H2
G12
H1
H7
H8
H9
H10
L5 L4
K5
K6
H11
H12
J7
J8
K7
K8
L1
L7
L8
M1
K3
K4
M2
M3
M4
M5
M6
J9
J10 J11 J12
J5
J6
K1
K2
H3
L6
K10 K11 K12
K9
J1
J2
J3
J4
L3 L9
L10 L11 L12
A1
A2
A3
A4
A5
E5
A6
A7
A8
A9
A10
A11
A12
B1
B7
B8
B9
B10
C1
C2
B11
B12
C7
C8
D7
D8
E7
E8
E1
F1
C3
C4
F2
F3
F4
F5
F6
C9 C10 C11 C12 D9 D10 D11 D12 E9 E10 E11 E12
C5
C6
D1
D2
E2
B2
E6
D3
D4
D5
D6
E4 E3
F7
F8
M7
M8
M9
M10 M11 M12
F9 F10 F11 F12
H4
H5
H6
B3
B4
B5
B6
GND1
GND1
GND1
GND1
GND1
RUN/SS1
GND1
GND1
GND1
GND1
GND1
GND1
SW1
GND1
GND1
GND1
GND1
GND1
GND1
COMP1 PGOOD1
VIN1
VIN1
GND1
GND1
GND1
GND1
GND1
GND1
GND1
GND1
GND1
GND1
VIN1
VIN1
GND1
GND1
GND1
GND1
GND1
VOUT1 VOUT1 VOUT1 VOUT1
VIN1
VIN1
VIN1
VIN1
SW1
FB1 VOUT1 VOUT1 VOUT1 VOUT1
VIN1
VIN1
VIN1
VIN1
TRACK1 VOUT1 VOUT1 VOUT1 VOUT1
GND2
GND2
GND2
GND2
GND2
COMP2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
VIN2
VIN2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
VIN2
VIN2
GND2
GND2
GND2
GND2
GND2
VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2
VIN2
VIN2
VIN2
VIN2
RUN/SS2
SW2
FB2
VIN2
VIN2
VIN2
VIN2
PGOOD2
TRACK2
GND2
GND2
GND1
GND1
VOUT1 VOUT1 VOUT1 VOUT1
VOUT2 VOUT2 VOUT2 VOUT2
SW1
SW1
SW1
SW2
SW2
SW2
SW2
CO3 22uF
6.3V
CPP1 OPT
TP7
CIN4 10uF
6.3V
TP21
TP1
R9
4.02K OPT
CO7
OPT
TP2
CO9
100uF
6.3V
R10 1mOhm
CIN6 10uF
6.3V
RSET2
10K
TP13
OPT C3
TP20
CO2
OPT
CFF1 OPT
TP9
TP6
TP16
OPT C4
TP15
TP14
TP17
CO5
OPT
CO4
OPT
CIN5 10uF
6.3V
TP10
TP4
R6
4.99K
1%
OPT C1
CO12 OPT
CO8 22uF
6.3V
TP3
R2
100K
CPP2 OPT
JP1
1
2
3
CO6
OPT
+
CIN1
120uF 10V
R1 100K
TP23
TP8
JP3
1
2
3
CO11
OPT

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DEMO MANUAL DC1385A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2011
LT 0211 • 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
Copyright © 2004, Linear Technology Corporation

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