Linear Technology DC1453A Quick setup guide

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dc1453af
DEMO MANUAL DC1453A
DESCRIPTION
LTM4619EV: 4.5V-28V,
Dual 4A Step-Down µModule
Regulator
Demonstrationcircuit1453AfeaturestheLTM
®
4619EV, the
high input voltage, high efficiency, high density, dual 4A
step-down power module. Deratingisnecessary for certain
VIN, VOUT, and thermal conditions. The two outputs are
interleaved with 180° phase to minimize the input ripple
and reduce the input capacitors. A minimum design only
requires the bulk input and output capacitors and voltage
setting resistors. The LTM4619EV features output voltage
tracking, power good indicator, RUN pin control, clock
synchronization and soft-start programming. Protection L, LT, LTC, LTM, Linear Technology, the Linear logo, μModule and Burst Mode are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
BOARD PHOTO
PERFORMANCE SUMMARY
(TA= 25°C)
features include foldback current limiting and overvolt-
age protection. Burst Mode
®
operation or pulse skipping
mode can be selected for better light load efficiency. The
LTM4619 data sheet must be read in conjunction with
this demo manual for working on or modifying the demo
circuit 1453A.
Design files for this circuit board are available at
http://www.linear.com/demo
PARAMETER CONDITION VALUE
Input Voltage Range 4.5V to 28V
Output Voltage VOUT1, VOUT2 3.3V ±2%, 1.8V ±2%
Maximum Continuous Output Current Derating Is Necessary for Certain VIN, VOUT, and Thermal Conditions,
See Datasheet for Details.
4ADC for VOUT1, VOUT2
Default Operating Frequency JP2 on the 500kHz position. 500kHz
Efficiency of Channel 1 VIN = 12V, VOUT1 = 3.3V, IOUT1 = 4A, Switching Frequency = 500kHz. 89.4%, See Figure 3
Efficiency of Channel 2 VIN = 12V, VOUT2 = 1.8V, IOUT2 = 4A, Switching Frequency = 500kHz. 84.1% See Figure 3

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DEMO MANUAL DC1453A
VIN
+
–
+
–
–
+
0A ~ 4A +
–
–
+
LOAD
0A ~ 4A
–
+
–
+
LOAD
QUICK START PROCEDURE
Demonstration circuit 1453A is an easy way to evaluate the
LTM4619. If VIN is always below 5.5V, stuff a 0Ω resistor
at R16. Do not stuff R16 if VIN is higher than 5.5V. 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
3.3V and 1.8V application:
MODE/
CLK SEL. RUN1 FREQUENCY TRACK1 RUN2 TRACK2
CCM On 500kHz Soft-Start On Soft-Start
2. With power off, preset the loads to 0A and VIN supply
to be less than 28V. 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 3.3V ±2%, and the
voltage between VO2+and VO2–should be 1.8V ±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 Fig-
ure 2 for proper setup. Keep in mind at high switching
frequencies and/or high input voltages, lower output
voltage may not regulate properly due to the minimum
on time of the regulator. Refer to the data sheet for more
details.
5. For output voltage tracking during start-up and shut-
down, set jumpers JP3 and JP4 to EXT SIGNAL and
apply a valid voltage signal to E8 and E10.
6. To synchronize the switching frequency to an external
clock set jumper JP2 in the EXT. CLK position and the
jumper JP1 in the BURST MODE / EXT. CLK position.
Apply a valid clock signal on the CLK SYNC test point.
Figure 1. Test Setup of DC1453A
Figure 2. Proper Scope Probe Placement
for Measuring Input or Output Ripple
INPUT OR OUTPUT CAPACITOR

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DEMO MANUAL DC1453A
QUICK START PROCEDURE
Figure 3. Measured Efficiency for Two Outputs on DC1453A
Figure 4. Measured Load Transient Response for VOUT1 Figure 5. Measured Load Transient Response for VOUT2
3.3V VOUT1 Efficiency at 500kHz Frequency 1.8V VOUT2 Efficiency at 500kHz Frequency
LOAD CURRENT (A)
0
EFFICIENCY (%)
100
90
70
50
80
60
40
30 2
dc1453 F03a
431
6VIN
12VIN
28VIN
CCM
BURST
PS
LOAD CURRENT (A)
0
EFFICIENCY (%)
100
90
70
50
80
60
40
30 2
dc1453 F03b
431
6VIN
28VIN
12VIN
CCM
BURST
PS
VIN = 12V
VOUT1 = 3.3V
CONTINUOUS CURRENT MODE (CCM)
0A TO 4A LOAD STEP ON VOUT1
COUT1 = 100μF CERAMIC (1210, X5R, 6.3V) +
22μF CERAMIC (1206, X5R, 6.3V)
dc1453 F04
IOUT1 (4A/DIV)
VOUT1 (100mV/DIV)
VIN = 12V
VOUT2 = 1.8V
CONTINUOUS CURRENT MODE (CCM)
0A TO 4A LOAD STEP ON VOUT2
COUT2 = 100μF CERAMIC (1210, X5R, 6.3V) +
22μF CERAMIC (1206, X5R, 6.3V)
dc1453 F05
IOUT2 (4A/DIV)
VOUT2 (200mV/DIV)

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DEMO MANUAL DC1453A
PARTS LIST
ITEM QUANTITY REFERENCE PART DESCRIPTION MANUFACTURER, PART NUMBER
Required Circuit Components:
1 1 C8 Capacitor, Alum, 150μF, 35V Sanyo, 35CE150AX
2 2 C2, C3 Capacitor, X5R, 10μF, 35V, 1206 Taiyo Yuden, GMK316BJ106MA-T
3 2 C17, C20 Capacitor, X5R, 22μF, 6.3V, 1206 Taiyo Yuden, JMK316BJ226ML-T
4 2 C22, C23 Capacitor, X5R, 100μF, 6.3V, 1210 Taiyo Yuden, JMK325BJ107MM-T
5 2 C10, C13 Capacitor, NPO, 10pF, 50V, 0603 AVX, 06035A100KAT2A
6 1 C12 Capacitor, NPO, 47pF, 50V, 0603 AVX, 06035A470KAT2A
7 2 C25, C26 Capacitor, X7R, 0.1μF, 50V, 0603 TDK, C1608X7R1H104K
8 1 R2 Resistor, Chip, 2k, 1/10W, 5% Vishay, CRCW06032K00JKEA
9 1 R1 Resistor, Chip, 6.34k, 1/10W, 1% Vishay, CRCW06036K34FKEA
10 1 R3 Resistor, Chip, 19.1k, 1/10W, 1% Vishay, CRCW060319K1FKEA
11 1 R15 Resistor, Chip, 100k, 1/10W, 5% Vishay, CRCW0603100KJNEA
12 1 R4 Resistor, Chip, 48.7k, 1/10W, 1% Vishay, CRCW060348K7FKEA
13 1 U1 I.C., Dual 4A Step-Down Module Linear, Technology LTM4619EV LGA
Additional Demo Board Circuit Components:
1 1 C30 Capacitor, X5R, 1μF,35V, 0603 Taiyo Yuden, GMK107BJ105KA-T
2 0 C1, C4-C7, C9, C11,
C12, C14, C16-C18,
C19, C21, C24,
C27-C29
OPT OPT
3 1 R7 Resistor, Chip, 19.1k, 1/10W, 1% Vishay, CRCW060319K1FKEA
4 3 R5, R6, R10 Resistor, Chip, 60.4k, 1/10W, 1% Vishay, CRCW060360K4FKEA
5 2 R8, R12 Resistor, Chip, 48.7k, 1/10W, 1% Vishay, CRCW060348K7FKEA
6 0 R9, R11, R13, R14,
R16
OPT OPT
Hardware for Demo Board Only:
1 12 E1-E12 Testpoint, Turret, 0.094" Mill-Max, 2501-2-00-80-00-00-07-0
2 4 4 Corners Stand-Off, Nylon, 0.5" Keystone, 8833 (SNAP ON)
3 3 JP3, JP5, JP6 Header, 3-Pin, 1-Row, 0.079CC Samtec, TMM-103-02-L-S
4 2 JP1, JP2 Header, 4-Pin, 1-Row, 0.079CC Samtec, TMM-104-02-L-S
5 1 JP4 Header, 3-Pin, 2-Row, 0.079CC Samtec, TMM-103-02-L-D
6 6 JP1-JP6 Shunt, 0.079" Center Samtec, 2SN-BK-G
7 6 J1-J6 Banana Jack Keystone, 575-4

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DEMO MANUAL DC1453A
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 representation
that the interconnection of its circuits as described herein will not infringe on existing patent rights.
SCHEMATIC DIAGRAM
A A
B B
C C
D D
E E
4 4 3 3 2 2 1 1
Circuit That Meets Customer-Supplied Specifications;
LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY Linear Technology Has Made A Best Effort To Design A Supplied For Use With Linear Technology Parts. This Circuit Is Proprietary To Linear Technology And Circuit Board Layout May Significantly Affect Circuit Applications Engineering For Assistance. Application. Component Substitution And Printed However, It Remains The Customer's Responsibility To
Performance Or Reliability. Contact Linear Technology Verify Proper And Reliable Operation In The Actual
Customer Notice
4.5V - 28V
Oscon
1210
3.3V / 4A
Max
1.8V / 4A
Max
1206
1206Poscap
ON
RUN1
OFF
pad
FREQUENCY
EXT. CLK
LTM4619EV
780KHz 500KHz CCM PULSE SKIP
12101206 Poscap
,C3 ,C5 ,C7,C28
SOFT START
TRACK1
EXT. SIGNAL
,C19
MODE / CLK SEL.
BURST MODE / EXT. CLK
For 4.5V < VIN < 5.5V Stuff 0 Ohm
TRACK2
OFF
RUN2
EXT. SIGNAL
ON
TRACK VOUT1 SOFT START
pad
__
4.5V - 28V, Dual 4A Step-Down Module
T
TT T
Demo Circuit 1453A
A
Linear Technology Corporation 1630 McCarthy Blvd.
Milpitas, CA. 95035 Phone [phone] Fax [phone] www.linear.com
11Wednesday, April 22, 2009
Title
Size Document Number Rev.
Date: Sheet of
INTVCC
VIN
VOUT2
INTVCC
INTVCC
VIN
INTVCCVIN
VOUT1
VIN
VOUT1
E2
VIN
E6
VO1-
C17 22uF 6.3V
R12 48.7K 1% JP2
1 2 3 4
R4 48.7K 1%
JP1
1 2 3 4
C6 Opt. 1210
R9 Opt. 0603
J6
GND
R5 60.4K 1%
R2 2K
J1
VIN
E10
TRACK2
R11 Opt. 0603
U1
LTM4619EV
H6
J4 J5 H3
K7
H8
F6
L7
J1
A10 A1
A8 A9
B4
E1
H7
J6
A7 A6 A5 A4
J7
B5
B6
B7
B8
B9
C4
C5
C6
C7
C8
C9
D4
D5
D6
D7
D8
D9
E2
E3
E4
E12
E5
E6
E7
E9
E8
E10
E11
F1
F2
F3
F4
F5
F7
F8
F9
F10
F11
F12
G1 G2 G3 G4 G5 G6 G7 G8 G9 G10 G11 G12 H1 H2 H4 H9 H11 H12 K5
H5
J9
H10
K8
A11 A12 B10 B11 B12
C10 C11 C12 D10 D11 D12
A2 A3 B1 B2 B3 C1 C2 C3 D1 D2 D3 L6 K6 J8
J2
J3
J10
J11
J12
K1
K2
K3
K4
K9
K10
K11
K12
L1
L2
L3
L4
L5
L8
L9
L10
L11
L12
M1
M2
M3
M4
M5
M6
M7
M8
M9
M10
M11
M12
SGND
EXTVCC
RUN2
SW2
VFB1
MODE_PLLIN
INTVCC
COMP1
VIN
VOUT1 VOUT2
PGND PGND
PGND
PGND
SGND SGND PGND PGND PGND PGND SGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND
PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND PGND
TRACK2
PGOOD RUN1 SW1 TRACK1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1 VOUT1
VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2 VOUT2
COMP2
VFB2
FREQ
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
E4
VO1+
C2 10uF 35V
+
Opt. C21 6.3V
C14 Opt. 0603
R8 48.7K 1%
C1 Opt. 0603
C29 Opt. 0603
R15 100K
C30 1uF 35V
JP3
1 2 3
C4 Opt. 1206
R1
6.34K
1%
E8
TRACK1
R13 Opt. 0603
C11 Opt. 0603
+
100uF C22 6.3V
SW2
J4
VOUT2
E3
GND
+
100uF C23 6.3V
E9
SGND
C10 10pF 0603
R6 60.4K 1%
JP5
1 2 3
R14 Opt. 0603
J5
GND
E11
PGOOD
C20 22uF 6.3V
E5
VO2+
C16 Opt. 1210
C18 Opt. 1206
JP6
1 2 3
+
150uF C8 35V
J3
VOUT1
R7
19.1K
1%
C13 10pF 0603
SW1
C26 0.1uF 0603
C27 Opt. 0603
E7
VO2-
C15 Opt. 1206
JP4
1 2 3 4 5 6
E12
EXTVCC
C9 Opt. 0603
C12 47pF 0603
R10 60.4K 1%
J2
GND
+
Opt. C24 6.3V
R16 Opt. 0603
C25 0.1uF 0603
R3
19.1K
1%
E1
CLK SYNC

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DEMO MANUAL DC1453A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2009
LT 1210 • 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 direc-
tive 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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