Linear Technology DC1367A Quick setup guide

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dc1367af
DEMO MANUAL DC1367A
DESCRIPTION
LTM4615EV:
Dual DC/DC Step-Down
µModule Regulator with LDO
Demonstration circuit 1367A features the LTM
®
4615EV, a
triple output μModule
®
regulator consisting of two switch
mode outputs and one LDO output. Each LTM4615 DC/DC
converter has aseparate input andenable pin. TheLTM4615
maximum load current is 4A for each switch mode channel
and 1.5A for the VLDO™ channel. However the DC1367A
is configured with the LDO input supply connected to
the VOUT2 whose maximum output current decreases
accordingly. Derating is necessary for certain VIN, VOUT
L, LT, LTC, LTM, μModule, Linear Technology and the Linear logo are registered trademarks
and VLDO is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
BOARD PHOTO
PERFORMANCE SUMMARY
(TA= 25°C)
and thermal conditions. The LTM4615 data sheet must be
read in conjunction with this manual prior to working on
or modifying DC1367A.
Design files for this circuit board are available at
http://www.linear.com/demo
PARAMETER CONDITION VALUE
Input Voltage Range Both Switch Mode Outputs (VIN1 and VIN2) 2.5V to 5.5V
Output Voltage VOUT1 DC Voltage, VIN1 = 3.3V, IOUT1 = 4A 1.8V ±2%
Output Voltage VOUT2 DC Voltage, VIN2 = 3.3V, IOUT2 = 2.5A 1.2V ±2%
Output Voltage VO3(LDO) DC Voltage, VIN2 = 3.3V, IOUT3 = 1.5A 1.0V ±2%
Maximum Continuous Output Current Note: IOUT2 = 4.0A – I03 4A DC at VOUT1, 4A DC at VOUT2, 1.5A DC at VO3
Default Operating Frequency For 2 Switching Mode Channels 1.25MHz
Efficiency of Channel 1 VIN1 = 5.5V, VOUT1 = 1.8V, IOUT1 = 4A 82.8%, See Figure 3
Efficiency of Channel 2 VIN2 = 5.5V, VOUT2 = 1.2V, IOUT2 = 2.5A 81.7%, See Figure 3

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DEMO MANUAL DC1367A
QUICK START PROCEDURE
Figure 1. Test Setup of DC1367A
Figure 2. Proper Scope Probe Placement for Measuring
Input or Output Ripple
Demonstration circuit 1367A is an easy way to evaluate
the performance of the LTM4615. 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, 1.2V and 1.0V application:
TRACK1 RUN1 RUN2
DISABLED ON ON
2. With power off, preset the loads to 0A and VIN supply
to be 5V. Connect the input power supply, load and
meters as shown in Figure 1.
3. Turn on the power at the input. The output voltage
between VO1+ and VO1– should be 1.8V ± 2%, the
voltage between VO2+ and VO2– should be 1.2V ± 2%,
and the voltage between VO3(LDO) and GND should be
1.0V ±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. VOUT1 can track another supply by connecting TP14,
TRACK to the supply rail and setting JP1 to ENABLED.
When R8 equalsRSET1, VOUT1 is setup for coincidental
tracking. VOUT2 is set up to coincidentally track VOUT1
as determined by resistors R6 and R7. Please refer to
the circuit schematic and data sheet.
6. VOUT2 is used as the input supply for the 1.5A LDO.
Therefore, if the jumper of JP3 (RUN2) is placed at OFF
position, both channel 2 and 3 will be turned off.
7. Because DC1367A is designed so VOUT2 tracks VOUT1
automatically, placing the JP2 (RUN1) to OFF position
turnsoff allthree outputs.To disabletracking onVOUT2,
please remove R6 and R7 and connect TRACK2 to VIN2.
8. VIN1 and VIN2 are shorted on DC1367A through a 1mΩ
resistor, R10. If desired, remove R10 to allow separate
VIN1 and VIN2 power supplies.
A
–+
LOAD
0A TO
4A
V
+
–
A
–+
LOAD
0A TO
2.5A
V
+
–
A
–
+
LOAD
0A TO
1.5A
V+
–
VIN
DC1376 F01
V+
–
+–
A
–
+
+–
INPUT OR OUTPUT CAPACITOR DC1376 F02

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DEMO MANUAL DC1367A
QUICK START PROCEDURE
Figure 3. Measured Efficiency for Different Channels
Figure 4. Measured Load Transient Response for VOUT1
Figure 5. Measured Load Transient Response for VOUT2
VOUT1
50mV/DIV
IOUT1
2A/DIV
20μs/DIVVIN1 = 5.5V
VOUT1 = 1.8V
VOUT2 = 1.2V AT NO LOAD
VO3(LDO) = 1.0V AT NO LOAD
CONTINUOUS CURRENT MODE (CCM)
0A TO 3.4A LOAD STEP ON VOUT1
COUT1 = 100μF CERAMIC (1210, X5R, 6.3V) + 22μF CERAMIC (1206, X5R, 6.3V)
DC1367 F04
VOUT2
20mV/DIV
IOUT2
1A/DIV
20μs/DIVVIN2 = 5.5V
VOUT2 = 1.2V
VOUT1 = 1.8V AT NO LOAD
VO3(LDO) = 1.0V AT NO LOAD
CONTINUOUS CURRENT MODE (CCM)
0A TO 2.2A LOAD STEP ON VOUT2
COUT2 = 100μF CERAMIC (1210, X5R, 6.3V) + 22μF CERAMIC (1206, X5R, 6.3V)
DC1367 F05
LOAD CURRENT (A)
0
EFFICIENCY (%)
65
80
95
90
85
70
75
55
60
40
45
25
30
1.5 2.5 4.0
DC1376 F03
50
35
20 0.5 1.0 2.0 3.5
3.0
VIN1 = 5.5V, VOUT 1 = 1.8V
CHANNEL 2 AND 3 OFF
VIN2 = 5.5V, VOUT 2 = 1.2V
CHANNEL 1 AND 3 OFF
VIN3 = 1.2V, VOUT 3 = 1.0V
CHANNEL 1 AND 2 OFF

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DEMO MANUAL DC1367A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 2 CIN6, CIN10 CAP., OS-CON, 47μF, 10V, C6 SIZE SANYO, 10SVP47M
2 2 CO4, CO9 CAP., X5R, 100μF, 6.3V, 10%,1210-7343 AVX, 12106D107KAT2A
3 2 CO3, CO8 CAP., X5R, 22μF, 6.3V, 20%, 1206-0805 AVX, 12066D226MAT2A
4 5 C1, CIN3, CIN4, CIN8, CIN9 CAP., X5R, 10μF, 6.3V, 20%, 1206-0805 AVX, 12066D106MAT2A
5 1 CIN5 CAP., X5R, 10μF, 6.3V, 20%, 0805-0603 AVX, 08056D106MAT2A
6 1 L1 IND, 0.2μH Fair-Rite, 2508056017Y2
7 1 RSET1 RES., CHIP, 4.02k, 1/16W, 1%, 0603 VISHAY, CRCW06034K02FKEA
8 2 RSET2, R7 RES., CHIP, 10k, 1/16W, 1%, 0603 VISHAY, CRCW060310K0FKEA
9 1 RSET3 RES., CHIP, 3.32k, 1/16W, 1%, 0603 VISHAY, CRCW060333K2FKEA
10 3 R1,R2, R9 RES., CHIP, 100k, 1/16W, 1%, 0603 VISHAY, CRCW0603100KFKEA
11 1 R6 RES., CHIP, 4.99k, 1/16W, 1%, 0603 VISHAY, CRCW06034K99FKEA
12 1 U1 I.C., LTM4615EV#PBF, LGA LINEAR TECH., LTM4615EV#PBF
Additional Demo Board Circuit Components
1 0 CO1, CO6 (OPT) CAP., 1206-0805
2 0 CSS1, CSS2, CP1, CP2, C3, C4 (OPT) CAP., 0603
3 0 COMP1, COMP2, CFF1, CFF2 (OPT) CAP., 0603
4 0 CO5, CO7, CO10, CO2(OPT) CAP., 1210-7343
5 0 R8 RES., CHIP, 0603
6 1 R5 RES., CHIP, 4.99k, 1/16W, 1%, 0603 VISHAY, CRCW06034K99FKEA
7 1 R10 RES., CHIP, 1M, 1W, 1%, 2512 PANASONIC, ERJM1WTJ1M0U
Hardware For Demo Board Only
1 3 JP1, JP2, JP3 2MM SINGLE ROW HEADER, 3 PIN SAMTEC, TMM-103-02-L-S
2 3 JP1, JP2, JP3 SHUNT, SAMTEC, 2SN-BK-G
3 7 TP8-TP11, TP22, TP2, TP3 BANANA JACK, KEYSTONE, 575-4
4 14 TP1, TP4-TP7, TP12-TP18, TP21, TP23 TESTPOINT, TURRET, .095” MILL-MAX, 2501-2-00-80-00-00-07-0
5 4 STAND OFF STAND-OFF, NYLON 0.50” tall KEYSTONE, 8833 (SNAP ON)

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DEMO MANUAL DC1367A
SCHEMATIC DIAGRAM
A A
B B
A A B B
ENABLED
DISABLED TRACK1
[email protected]
2.5V - 5.5V
6.3V
6.3V
6.3V
RUN1
6.3V
2)) 21
581
(LDO)
[email protected]
1.8V@4A
ON
OFF
MAX
MAX
MAX
6.3V
2.5V - 5.5V
A
DC1367A
Thursday, July 24, 2008
11
HELEN 11/28/07
Judy Sun 11/28/07
Dual Output Step-Down Power uModule with VLDO
LTM4615EV High Density
SIZE
SCALE:
CAGE CODE DWG NO REV
SHEET OF
FILENAME:
TITLE
CONTRACT NO.
APPROVALS DATE
DRAWN CHECKED APPROVED ENGINEER DESIGNER
TECHNOLOGY
1630 McCarthy Blvd. Milpitas,CA 95035 Phone: [phone] Fax : [phone]
7+,6&,5&8,7,635235,(7$5<72/,1($57(&+12/2*<$1' 6833/,(')2586(:,7+/,1($57(&+12/2*<3$576
/,1($57(&+12/2*<+$60$'($%(67())25772'(6,*1$ &,5&8,77+$70((76&86720(56833/,('63(&,),&$7,216 +2:(9(5,75(0$,167+(&86720(565(63216,%,/,7<72 9(5,)<3523(5$1'5(/,$%/(23(5$7,21,17+($&78$/ $33/,&$7,21&20321(1768%67,787,21$1'35,17(' &,5&8,7%2$5'/$<2870$<6,*1,),&$17/<$))(&7&,5&8,7 3(5)250$1&(255(/,$%,/,7<&217$&7/,1($5 7(&+12/2*<$33/,&$7,216(1*,1((5,1*)25$66,67$1&(
&86720(5127,&(
VOUT2
VOUT1
VIN1 VIN2
VOUT1
VOUT2
VOUT1
VIN1
VIN2
VOUT1
TP21 VIN2+
RSET2 10K 1%
R2
100K
U1
LTM4615EV
J1
J2
J3
J4
J5
K1
K2
K3
K4
K5
L4
K9
K10 K11 K12
L9
L10 L11 L12
M9
M10 M11 M12
L5 L6 L3 L2
H2
H3
H4
H5
H6
B2
B3
B4
B5
B6
C1
C2
C3
C4
C5
C6
D1
D2
D3
D4
D5
E4 C9 C10 C11 C12 D9 D10 D11 D12 E11 E12 G1 G2 G3 G4 F8 E5 E6 G9 G10 G11 G12 F6
H1
H7
H8
H9
H10
H11
H12
J6
J7
J8
J9
J10
J11
J12
K6
K7
K8
L1
L7
L8
M1
M2
M3
M4
M5
M6
M7
M8
A1
A2
A3
A4
A5
A6
A7
A8
A9
A10
A11
A12
B1
B7
B8
B9
B10
B11
B12
C7
C8
D6
D7
D8
E1
E8
E9
E10
F1 F2 F3 F4 F5 F7 F9
F10 F11 F12
E3 E7 E2
G5 G6 G7 G8
VIN1
VIN1
VIN1
VIN1
VIN1
VIN1
VIN1
VIN1
VIN1
VIN1
PGOOD1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 COMP1 FB1 TRACK1 RUN/SS1
SW1
SW1
SW1
SW1
SW1
SW2
SW2
SW2
SW2
SW2
VIN2
VIN2
VIN2
VIN2
VIN2
VIN2
VIN2
VIN2
VIN2
VIN2
VIN2
PGOOD2
VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2
LDO_IN LDO_IN LDO_IN LDO_IN
EN3
COMP2
FB2
LDO_OUT LDO_OUT LDO_OUT LDO_OUT
FB3
GND1
GND1
GND1
GND1
GND1
GND1
GND1
GND1
GND1
GND1
GND1
GND1
GND1
GND1
GND1
GND1
GND1
GND1
GND1
GND1
GND1
GND1
GND1
GND1
GND1
GND1
GND1
GND1
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND2
GND3 GND3 GND3 GND3 GND3 GND3 GND3 GND3 GND3 GND3
TRACK2
BOOST3
RUN/SS2
PGOOD3 GND3 GND3 GND3
CO6
(OPT)
C4
(OPT)
CO9
100uF
6.3V
CCOMP1 (OPT)
TP22 VIN2
TP4
GND
TP7
VO1+
TP5
PGOOD1
CO3
22uF
RSET3
3.32K
TP16 GND
L1 0.2uH
CO7
(OPT) CO10
(OPT)
JP1
1
2
3
CIN9
10uF
R7
10K 1%
R5 4.99K
CP2 (OPT)
C1
10uF
6.3V
TP15 VO3
CFF1 (OPT)
TP17 PGOOD2
CIN3
10uF
CIN8
10uF
TP1
VIN1+
CO1
(OPT)
CO4
100uF
JP2
1
2
3
CFF2 (OPT)
R10 0.001
CSS2
(OPT)
C3
(OPT)
RSET1 4.02K 1%
+CIN6
47uF
TP10 GND
CO8
22uF
6.3V
CIN5
10uF
CO5 (OPT)
TP2
VIN1 SW1
TP11
GND
JP3
1
2
3
TP6 VO2+
R8
(OPT)
+CIN10
47uF
TP23 GND
CIN4
10uF
CO2
(OPT)
TP13
VO1-
TP3
GND
TP8 VOUT2
CSS1 (OPT)
R1
100K
TP18
PGOOD3
CP1 (OPT)
TP12 VO2-
TP9
VOUT1
CCOMP2
(OPT)
R9
100K
R6
4.99K 1%
TP14
TRACK
SW2

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DEMO MANUAL DC1367A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2010
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
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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