µModule
4 output step-down regulator. The LTM4643EV has an
operating input voltage range of 4V to 20V and is able
to provide up to 3A out output current from each of its
phases. Each output’s voltage is programmable from 0.6V
to 3.3V. The LTM4643EV is a complete DC/DC point of load
regulator in a thermally enhanced 15mm × 9mm×1.82mm
LGA package requiring only a few input and output ca
pacitors. Output voltage tracking is available through the
regulator, a high performance high efficiency
-
BoarD photo
TRACK/SS pin for supply rail sequencing. External clock
synchronization is also available through the CLKIN pin.
The CLKOUT pin provides for synchronization of additional
modules’ phases. The LTM4643 data sheet must be read
in conjunction with this demo manual for working on or
modifying demo circuit 2453A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2453A
L, LT, LTC, LTM, Linear Technology, the Linear logo and μModule are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
Figure 1. Quad 3A LTM4643; DC2453A
dc2453afb
1
Page 2
DEMO MANUAL DC2453A
performance summary
PARAMETERCONDITIONS/NOTESVALUE
Input Voltage Range4V – 20V
Output Voltage V
Maximum Continuous Output Current per PhaseDerating is Necessary for Certain Operating
Default Operating Frequency1.2MHz
EfficiencyV
OUT
Jumper Selectable V
Conditions. See Data Sheet for Details
= 12V, V
IN
OUT1
= 3.3V, I
= 3A 89% See Figure 2
OUT
= 3.3VDC, V
OUT1
1.5VDC, V
3ADC
Quick start proceDure
OUT4
OUT2
= 1.2VDC
= 2.5VDC, V
OUT3
=
Demonstration circuit 2453A is an easy way to evaluate the
performance of the LTM4643EV. Please refer to Figure 1
for test setup connections and follow the procedure below.
1. With power off, place the jumpers in the following
positions:
JP1JP2JP3JP2
RUN1RUN2RUN3RUN4
ONONONON
JP8JP7JP6JP5
MODE1MODE2MODE3MODE4
CCMCCMCCMCCM
2. Before connecting input supply, loads and meters, preset
the input voltage supply to be between 4V to 20V. Preset
the load currents to 0A.
3. With power off, connect the loads, input voltage supply
and meters as shown in Figure 1.
4. Turn on input power supply. The output voltage meters
for each phase should display the programmed output
voltage ±2%.
5. Once the proper output voltage is established, adjust the
load currents for each phase within the 0A to 3A range
and observe the load regulation, efficiency, and other
parameters. Output voltage ripple should be measured
at J6 with a BNC cable and oscilloscope.
6. To observe increased light load efficiency place, a Mode
pin jumper (JP5-JP8) in the DCM Mode position.
2
dc2453afb
Page 3
Quick start proceDure
DEMO MANUAL DC2453A
Figure 2. Test Setup of DC2453A
dc2453afb
3
Page 4
DEMO MANUAL DC2453A
OUTPUT CURRENT (A)
0
0.511.522.5
3
65
70
75
80
85
90
95
100
EFFICIENCY (%)
dc2453a F02a
3.3V
OUT1
2.5V
OUT2
1.5V
OUT3
1.2V
OUT4
OUTPUT CURRENT (A)
0
0.511.522.5
3
65
70
75
80
85
90
95
100
dc2453a F02b
3.3V
OUT1
2.5V
OUT2
1.5V
OUT3
1.2V
OUT4
Quick start proceDure
V
OUT1
100mV/DIV
_STEP
I
OUT1
1A/DIV
Figure 2. Measured Supply Efficiency at 5VIN and 12V
VIN (V)V
123.32 × 47μF/6.3V/Ceramic
Figure 3. Measured V
(V)C
OUT
CERAMIC
OUT
= 3.3V and V
OUT1
IN
V
OUT1
100mV/DIV
_STEP
I
OUT1
1A/DIV
VIN (V)V
(V)C
OUT
121.22 × 47μF/6.3V/Ceramic
= 1.2V Load Transient Responses (1.5A to 3A Load Step)
OUT4
CERAMIC
OUT
4
dc2453afb
Page 5
Quick start proceDure
V
(V)AIRFLOWAMBIENT (°C)
IN
5Natural Convection28
DEMO MANUAL DC2453A
Figure 4. Measured Thermal Capture with All Phases at Full Load (3A)
dc2453afb
5
Page 6
DEMO MANUAL DC2453A
parts List
ITEMQTYREFERENCEPART DESCRIPTIONMANUFACTURER/PART NUMBER
116E1, E3-E17TESTPOINT, TURRET 0.094"MILL MAX 2501-2-00-80-00-00-07-0
22J1, J2JACK, BANANAKEYSTONE 575-4
38JP1-JP8HEADER, 0.079" SINGLE ROW, 3-PINSULLINS, NRPN031PAEN-RC
48XJP1-XJP8SHUNT, 0.079" CENTERSAMTEC, 2SN-BK-G
54
R42-R45
STAND-OFFSSTAND-OFF
RES, 0603,OPTOPT
, NYLON 0.375" TALL (SNAP ON)KEYSTONE, 8832
6
dc2453afb
Page 7
schematic Diagram
5
4
3
2
1
D
C
B
A
DEMO MANUAL DC2453A
D
07-29-15
07-29-15
07-29-15
GND
VIN
VIN+
SAM Y.
SAM Y.
SAM Y.
4V - 20V
J2
J1
E12
PRODUCTION
PRODUCTION
PRODUCTION
REVISION HISTORY
DESCRIPTIONDATEAPPROVEDECO REV
REVISION HISTORY
DESCRIPTIONDATEAPPROVEDECO REV
REVISION HISTORY
DESCRIPTIONDATEAPPROVEDECO REV
VIN
1
1
1
_
_
_
25V
7343
33uF
C2
+
1206
C5
25V
22uF
1206
C4
25V
22uF
1206
C3
25V
22uF
C1
25V
22uF
1206
1uF
C6
R2
1
R1
10K
CLKOUT
TP5
E3
E1
TEMP
CLKIN
VOUT3
GND
E13
GND
1.5V / 3A MAX
E15
E14
C18
OPT
7343
+
C17
47uF
6.3V
1210
VOUT3
C16
47uF
6.3V
1206
C15
OPT
1206
C14
OPT
1206
R4
C13
100pF
40.2K
C22
OPT
COMP3
FB3
H7
F1
G2
G7
FB3
VOUT3
VOUT3G1VOUT3
SVIN1
SVIN2
SVIN3
SVIN4
TEMP
CLKIN
VOUT1
C10
C9
CLKOUT
VOUT1A2VOUT1
A3
+
C8
FB1
OPT
C7
C12
OPT
1206
C11
1206
OPT
6.3V
1206
47uF
6.3V
1210
47uF
OPT
7343
3.3V / 3A MAX
COMP3
FB1A7COMP1
B7
COMP1
C21
OPT
R3
13.3K
E9
GND
VIN1
B4
VIN1
B3
VIN2
E4
VIN2
E3
VIN4
L4
VIN4
L3
VIN3
H4
VIN3
H3
B5
E5
H5
L5
F3
J3
C7
A1
VOUT1
E8
VOUT1
R8
R7
E4
E6
INTVCC3
J4
INTVCC3
INTVCC1
C4
INTVCC1
TRACK1TRACK3
C
VOUT4
GND
TRACK4
1.2V / 3A MAX
E16
7343
C37
OPT
R10
0.1uF
SS3
G6
OPT
TRACK/SS3
+
C36
47uF
6.3V
VOUT4
C35
47uF
6.3V
C34
OPT
1206
C33
OPT
1206
C32
100pF
J1
K1
J7
VOUT4
VOUT4K2VOUT4
0
C26
E7
E17
1210
1206
R12
FB4
0
R16
R18
OPT
60.4K
C42
C46
OPT
COMP4
L7
COMP4
INTVCC4
K5
INTVCC4
0.1uF
SS4
K6
TRACK/SS4
B6
U1
LTM4643EV
VOUT2
TRACK/SS1
A6
SS1
C25
0.1uF
R9
OPT
0
FB2D7COMP2
VOUT2D2VOUT2
C1
D1
FB2FB4
C31
OPT
C38
OPT
1206
C30
OPT
1206
C29
1206
6.3V
47uF
VOUT2
C28
6.3V
1210
47uF
+
C27
OPT
7343
E11
E10
2.5V / 3A MAX
VOUT2
GND
INTVCC2
TRACK/SS2
F4
E7
COMP2
C41
OPT
R11
19.1K
INTVCC2
R15
E5
TRACK2
C6
D6
SS2
RUN1
C45
0.1uF
R17
OPT
0
MODE1
RUN1
B
123
CCM
DCM
JP8
MODE1
123
CCM
DCM
JP7
MODE2
123
JP6
CCM
DCM
MODE3
123
CCM
DCM
JP5
MODE4
E6
L6
H6
MODE2
MODE4
MODE3
GND
J5
GND
G5
GND
F5
GND
D5
GND
C5
GND
A5
GND
A4
GND
D4
GND
G4
GND
K4
GND
D3
GND
G3
GND
K3
GND
B2
GND
E2
GND
H2
GND
L2
GND
B1
GND
E1
GND
H1
GND
L1
R2800805
SGND
F7
PGOOD4
J2
PGOOD3
F2
PGOOD2
C2
PGOOD1
C3
RUN2
RUN4
RUN3
J6
F6
K7
INTVCC1
INTVCC2
INTVCC3
INTVCC4
RUN4
JP4
123
ON
JP3
123
ON
JP2
123
ON
RUN1RUN2RUN3RUN4INTVCC4INTVCC3INTVCC1INTVCC2
JP1
123
ON
RUN1RUN2RUN3RUN4
R27
R26
OFF
R25
OFF
R24
OFF
R23
OFF
RUN2
RUN3
R22
150K
R21
150K
R20
150K
R19
150K
VIN
R30
R31
R29
100K
100K
100K
100K
TP2
TP1
TP3
TP4
PGOOD2
PGOOD1
PGOOD3
100K
1%
100K
1%
100K
1%
100K
1%
PGOOD4
A
www.linear.com
www.linear.com
www.linear.com
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900
1630 McCarthy Blvd.
APPROVALS
APPROVALS
APPROVALS
CUSTOMER NOTICE
CUSTOMER NOTICE
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
VOUT2
OPT2512
R36
VOUT1
RUN2
R35
OPT
RUN1
SS2
R34
OPT
SS1
COMP2
PARALLEL OPERATION
OPTIONAL JUMPERS FOR
R33
OPT
COMP1
FB2
R32
OPT
FB1
1
1
1
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
m
LTM4643EV
LTM4643EV
LTM4643EV
DEMO CIRCUIT 2453A
DEMO CIRCUIT 2453A
DEMO CIRCUIT 2453A
TECHNOLOGY
TECHNOLOGY
TECHNOLOGY
IC NO.REV.
IC NO.REV.
IC NO.REV.
SCHEMATIC
SCHEMATIC
SCHEMATIC
QUAD 3A STEP-DOWN MODULE REGULATOR
QUAD 3A STEP-DOWN MODULE REGULATOR
QUAD 3A STEP-DOWN MODULE REGULATOR
N/A
N/A
N/A
SIZE
SIZE
SIZE
TITLE:
TITLE:
TITLE:
LT
LT
LT
SAM Y.
SAM Y.
SAM Y.
PCB DES.
PCB DES.
PCB DES.
APP ENG.
APP ENG.
APP ENG.
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.
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
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
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
OPT2512
OPT2512
R46
R41
VOUT2VOUT3
VOUT3VOUT4
R45
R40
OPT
OPT
RUN2RUN3
RUN3RUN4
R39
R44
OPT
OPT
SS2SS3
SS3SS4
R38
R43
OPT
OPT
COMP3COMP4
R37
R42
OPT
OPT
FB3FB4
FB2FB3 COMP2COMP3
1. ALL RESISTORS AND CAPACITORS ARE 0603.
NOTE: UNLESS OTHERWISE SPECIFIED
SHEET OF
SHEET OF
SHEET OF
1
Wednesday, July 29, 201511
Wednesday, July 29, 201511
Wednesday, July 29, 201511
DATE:
DATE:
DATE:
SCALE = NONE
SCALE = NONE
SCALE = NONE
2
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
3
4
5
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.
dc2453afb
7
Page 8
DEMO MANUAL DC2453A
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.