DEMO MANUAL DC1083A-A
LTM4603
Synchronizable 20V, 6A
Step-Down µModule Regulator
DESCRIPTION
Demonstration circuit DC1083A-A features the LTM
®
4603,
the high efficiency, high density step-down μModule
®
regulator. The input voltage range is from 4.5V to 20V. The
output voltage is jumper programmable from 0.6V to 5V.
The rated load current is 6A, while derating is necessary
for certain V
IN
, V
OUT
, and thermal conditions. Applying an
external clock signal to the PLLIN pin forces the μModule
regulator to operate at the same frequency. The output
ramp-up and ramp-down may be programmed through
the TRACK/SS pin. Margining function is provided for the
user who wants to stress their system by varying supply
voltages during testing. The LTM4603 data sheet must be
read in conjunction with this demo manual prior to working
on or modifying demo circuit DC1083A-A.
Design files for this circuit board are available at
http://www.linear.com/demo
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
PARAMETER
Input Voltage Range
Output Voltage V
OUT
Maximum Continuous Output Current
Default Operating Frequency
External Clock Frequency Range
CONDITION
(T
A
= 25°C)
VALUE
4.5V to 20V
1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5V; ± 2%
6A
DC
1MHz
700kHz to 1.3MHz
Jumper Selectable (Open for 0.6V)
Derating is Necessary for Certain V
IN
, V
OUT
, and Thermal Conditions
Refer to Data Sheet for Minimum t
ON
and t
OFF
Requirement
BOARD PHOTO
dc1083aaf
1
DEMO MANUAL DC1083A-A
QUICK START PROCEDURE
Demonstration circuit DC1083A-A is an easy way to evalu-
ate the performance of the LTM4603EV. 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
1.5V
OUT
application:
MARG0
LO
MARG1
LO
RUN
ON
VOUT SELECT
1.5V
5. To measure input and output ripple, please refer to
Figure 2 for proper setup.
6. For optional load transient test, apply adjustable pulse
signal between IOSTEP CLK and GND pins. Pulse ampli-
tude sets the current step. The pulse signal should have
very small duty cycle (<15%) to limit the thermal stress
on the transient load circuit. The output transient current
can be monitored at BNC connector J3 (10mV/A), the
output voltage can be monitored at BNC connector J4.
7. For margining function test, place jumper MARG0 and
MARG1 in the configurations shown in the following
table, measure the output voltage at J4.
MARG1
LO
LO
HI
HI
MARG0
LO
HI
LO
HI
ΔVOUT
0
+5%
–5%
0
2. With power off, preset the load to 0A and V
IN
supply to
be less than 20V. Connect the input power supply, load
and meters as shown in Figure 1.
3. Turn on the power at the input. The output voltage
should be 1.5V ± 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.
DC1083AA F01
Figure 1. Test Setup of DC1083A-A (DRV
CC
Bias Supply is Optional)
dc1083aaf
2
DEMO MANUAL DC1083A-A
QUICK START PROCEDURE
INPUT OR OUTPUT CAPACITOR
DC1083AA F02
Figure 2. Scope Probe Placements for Measuring Input or Output Ripple
Efficiency vs Load Current with 12V
IN
95
Efficiency vs Load Current with 20V
IN
95
85
EFFICIENCY (%)
EFFICIENCY (%)
85
75
75
65
55
V
O
= 1.2V
V
O
= 1.5V
V
O
= 1.8V
V
O
= 2.5V
V
O
= 3.3V
V
O
= 5V
0
1
2
3
4
5
LOAD CURRENT (A)
6
DC1083AA F03a
65
55
V
O
= 1.2V
V
O
= 1.5V
V
O
= 1.8V
V
O
= 2.5V
V
O
= 3.3V
V
O
= 5V
0
1
2
3
4
5
LOAD CURRENT (A)
6
DC1083AA F03b
45
45
Figure 3. Measured Supply Efficiency with Different V
IN
and V
OUT
I
STEP
2A/DIV
V
OUT
(AC)
50mV/DIV
DC1083AA F04
V
IN
= 12V, V
OUT
= 1.5V
1.5A TO 4.5A LOAD STEP
C
OUT
= 1×10μF CERAMIC, 1×100μF CERAMIC
Figure 4. Measured Load Transient Response (3A Step)
dc1083aaf
3
DEMO MANUAL DC1083A-A
PARTS LIST
ITEM
1
1
1
1
1
1
1
1
1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
1
2
3
4
5
6
7
QTY
2
1
1
1
1
1
2
1
1
1
0
0
0
1
2
0
1
1
2
1
1
2
0
1
1
1
1
1
1
13
6
3
4
2
4
4
REFERENCE
CIN2, CIN3
COUT1
COUT4
C5
R14
R4
R7, R23
R16
U1
CIN1
CIN4, CIN5
COUT2
COUT3
CSS
C1, C2
C3, C4, C6, C7
D1
Q1
R17, R1
R2
R3
R8, R5
R6, R9, R11, R12, R18
R10
R15
R19
R20
R21
R22
E1 TO E4, E6 TO E14
JP1 TO JP6
JP7, JP8, JP9
J1, J2, J5, J6
J3, J4
XJP2, XJP7, XJP8, XJP9
PART DESCRIPTION
CAP X7R 10μF 35V 20%
,
CAP X5R 100μF 6.3V 20%
,
CAP X5R 10μF 10V 10%
,
CAP NPO 47pF 50V 10%
,
RES, CHIP 51k 0.1W 5%
RES, CHIP 392k 0.1W 1%
RES, CHIP 0Ω 1/16W 1A
RES, CHIP 40.2k 0.1W 1%
μMODULE REGULATOR
CAP ALUM 150μF 35V 10%
,
CAP 1206 OPTIONAL
,
CAP 1812 OPTIONAL
,
CAP 1210 OPTIONAL
,
CAP X7R 0.1μF 16V 20%
,
CAP X5R 1μF 10V 10%
,
CAP 0603 OPTIONAL
,
ZENER DIODE, 5.1V
MOSFET, N-CHANNEL 30V
RES, CHIP 10k 0.1W 5%
RES, LRC 0.010 0.25W 1%
RES, CHIP 51k 0.1W 5%
RES, CHIP 10 0.1W 5%
RES, 0603 OPTIONAL
RES, CHIP 0Ω 1/16W 1A
RES, CHIP 60.4k 0.1W 1%
RES, CHIP 30.1k 0.06W 1%
RES, CHIP 19.1k 0.1W 1%
RES, CHIP 13.3k 0.1W 1%
RES, CHIP 8.25k 0.1W 1%
TURRET, TESTPOINT
JUMPER, 2 PINS 2mm CTRS
HEADERS, 3 PINS 2mm CTRS
CONNECTOR, BANANA JACK
BNC CONNECTOR
SHUNT, 2mm CTRS
STAND-OFF NYLON, 0.50" TALL
,
MANUFACTURER/PART NUMBER
TAIYO YUDEN GMK316BJ106ML-T
TAIYO YUDEN JMK432BJ107MU-T
TAIYO YUDEN LMK316BJ106KL-T
AVX 06035A470KAT1A
AAC CR16-513JM
AAC CR16-3923FM
AAC CJ06-000M
AAC CR16-4022FM
LINEAR TECHNOLOGY CORPORATION LTM4603EV
SANYO 35ME150WXV+TS (NOW SUNCON 35ME150WXV)
OPTIONAL
OPTIONAL
OPTIONAL
AVX 0603YC104MAT2A
TAIYO YUDEN LMK107BJ105KA
OPTIONAL
ON SEMICONDUCTOR MMBZ5231B
SILICONIX SUD50N03-10
AAC CR16-103JM
IRC LRF1206-01-R010-F
AAC CR16-513JM
AAC CR16-100JM
OPTIONAL
AAC CJ06-000M
AAC CR16-6042FM
AAC CR16-3012FM
AAC CR16-1912FM
AAC CR16-1332FM
AAC CR16-8251FM
MILL MAX 2308-2
SAMTEC TMM-102-02-L-S
SAMTEC TMM-103-02-L-S
KEYSTONE 575-4
CONNEX 112404
SAMTEC 2SN-BK-G
KEYSTONE, 8833 (SNAP ON)
Required Circuit Components
Additional Demo Board Circuit Components
Hardware - for Demo Board Only
dc1083aaf
4
5
4
3
2
1
REVISION HISTORY
ECO
REV
DESCRIPTION
DATE
APPROVED
VIN
E1
VIN+
0
1st PROTOTYPE
R14 (49.9k to 51k), Vout = 6Amp
01/04/07
Manjing Xie
1
J1
VIN
CIN4
(Opt)
CIN5
(Opt)
D
*
C1
1uF
10V
Q1
SUD50N03-10
R1
10K
C2
1uF
10V
E3
IOSTEP
+
CIN1
150uF
35V
CIN2
10uF
35V
CIN3
10uF
35V
D
J2
GND
E2
VIN-
A1
A2
A3
A4
A5
A6
B1
B2
B3
B4
B5
B6
C1
C2
C3
C4
C5
C6
J1
J2
J3
J4
J5
J6
J7
J8
J9
J10
K1
K2
K3
K4
K5
K6
K7
K8
K9
K10
K11
E4
PGOOD
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
VIN
5V
R2
0.010
1%
VOUT
J3
IOSTEP
SCHEMATIC DIAGRAM
(Opt)
C4
G12
R23
R4
A12
MPGM
INTVCC
MARG0
MARG1
DRVCC
FSET
COMP
VFB
DIFF_VOUT
VO_LCL
VOSNS+
VOSNS-
SGND
RUN
A10
TRACK/SS
A9
PLLIN
A8
1%
A7
C12
D12
E12
B12
A11
F12
R6
K12
L12
J12
M12
H12
R7
(Opt)
VO+
VO-
(Opt)
C5
47pF
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
0 Ohm
R9
392K
0 Ohm
PGOOD
R3
51K
(Opt)
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
C3
E6
DRVCC
J4
VOUT
C
5V
C
VO+
R5
10
E7
VO+
J5
VOUT
0.6V - 5V / 6A
COUT1
100uF
6.3V
COUT2
(Opt)
COUT3
(Opt)
COUT4
10uF
10V
J6
GND
R8
10
E8
VO-
VO-
E9
PLLIN
E14
GND
R10
0 Ohm
CSS
0.1uF
R12
(Opt)
E11
TRACK/SS
B
MARG0
1
HI
2
LO
3
JP7
U1
LTM4603EV/HVEV/-1EV
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
VOUT
L1
L2
L3
L4
L5
L6
L7
L8
L9
L10
L11
M1
M2
M3
M4
M5
M6
M7
M8
M9
M10
M11
5V
MARG1
1
HI
2
VOUT
LO
3
JP8
E10
FSET
B
R11
(Opt)
VOUT SELECT
JP1
1.2V
JP2
R16
40.2K
1%
R19
30.1K
1%
R20
19.1K
1%
R21
13.3K
1%
R22
C6
(Opt)
8.25K
1%
1.5V
JP3
1.8V
JP4
2.5V
JP5
3.3V
JP6
5V
60.4K
1%
R15
E12
COMP
C7
(Opt)
D1
D2
D3
D4
D5
D6
E1
E2
E3
E4
E5
E6
E7
F1
F2
F3
F4
F5
F6
F7
F8
F9
G1
G2
G3
G4
G5
G6
G7
G8
G9
H1
H2
H3
H4
H5
H6
H7
H8
H9
VIN
BOARD ASSEMBLY
U1
DC1083A-A
DC1083A-B
DC1083A-C
LTM4603EV
LTM4603HVEV
LTM4603-1EV
5V
R14
1
RUN
ON
VIN*
5V-20V
5V-28V
5V-20V
51K
2
3
R18
(Opt)
JP9
OFF
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.
5V
R17
10K
A
D1
5.1V
APPROVALS
DRAWN:
ENGINEER:
APPROVED:
CHECKED:
LINEAR TECHNOLOGY CORPORATION
www.linear.com
LTC Confidential -
For Customer Use Only
Title
Size
Date:
3
2
A
E13
SGND
1630 McCARTHY BLVD
MILPITAS, CA. 95035
(408)432-1900
(408)434-0507 (FAX)
HIGH DENSITY 5A STEP-DOWN POWER MODULE
Document Number
Rev
Demo Circuit 1083A
Sheet
1
1
1
of
This circuit is proprietary to Linear Technology and supplied
for use with Linear Technology parts.
Customer Notice:
Linear Technology has made a best effort to
design a circuit that meets customer-supplied specifications;
however, it remains the customers 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
Applications Engineering for assistance.
4
1
5
DEMO MANUAL DC1083A-A
dc1083aaf
5
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