DEMO MANUAL DC1084A-A
LTM4602
20V, 6A Step-Down
µModule Regulator
DESCRIPTION
Demonstration circuit DC1084A-A features the LTM
®
4602,
the high efficiency, high density step-down μModule
®
regulator. The input voltage range is from 5V to 20V. The
output voltage is jumper programmable from 0.6V to 5V,
refer to the step-down ratio curve in the LTM4602 data
sheet. The rated load current is 6A, while derating is
necessary for certain V
IN
, V
OUT
and thermal conditions.
The LTM4602 data sheet must be read in conjunction with
this demo manual prior to working on or modifying demo
circuit DC1084A-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
(T
A
= 25°C)
VALUE
4.5V to 20V
1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5V
6A DC
800kHz
CONDITION
Jumper Selectable (Open for 0.6V)
Derating is Necessary for Certain V
IN
, V
OUT
and
Thermal Conditions
BOARD PHOTO
dc1084a-af
1
DEMO MANUAL DC1084A-A
QUICK START PROCEDURE
Demonstration circuit DC1084A-A is an easy way to
evaluate the performance of the LTM4602EV. 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:
FCB
CCM
RUN/SS
ON
VOUT SEL
1.5V
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. Output ripple should be measured at
J6 with a BNC cable.
5. For optional load transient test, apply adjustable pulse
signal between IOSTEP CLK and GND pins. Pulse am-
plitude 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 tran-
sient current can be monitored at BNC connector J5
(10mV/A).
2. With power off, preset the load to 0A and V
IN
supply
to be less than 20V. Connect the input power supply,
load, optional 5V bias supply and meters as shown
in Figure 1. The optional 5V bias supply must be off
anytime the supply to VIN is turned off.
3. Turn on the power at the input. The output voltage
should be 1.5V ±2%.
Figure 1. Test Setup of DC1084A-A (EXTV
CC
Bias Supply is Optional)
dc1084a-af
2
DEMO MANUAL DC1084A-A
QUICK START PROCEDURE
Figure 2. Measured Supply Efficiency with Different V
IN
and V
OUT
(FADJ Open: 1.2V
OUT
to 2.5V
OUT
, FADJ = 15kΩ: 3.3V
OUT
to 5V
OUT
)
V
IN
= 12V, V
OUT
= 1.5V
0A to 5A LOAD STEP
FCB = 0V
C
OUT
= 1
×
22μF CERAMIC (1206), 1
×
100μF CERAMIC (1812),
C3 = 100pF
Figure 3. Measured Load Transient Response (0A-5A Step)
dc1084a-af
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DEMO MANUAL DC1084A-A
PARTS LIST
ITEM
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
QTY
1
2
1
1
1
1
1
1
0
0
0
0
1
2
0
1
1
1
1
1
1
3
1
1
1
0
1
REFERENCE
C1
C5, C2
C10
C7
C12
R2
R8
U1
C4, C3
C8
C6
C11, C14, C18, C19
C13
C15,C16
C17
D1
Q14
R1
R3
R4
R5
R6, R10, R12
R7
R9
R11
R13
R14
PART DESCRIPTION
CAP 150μF 20% 35V ALUM
,
CAP 1206 10μF 20% 35V X5R
,
CAP 1206 22μF 20% 6.3V X5R
,
CAP 1812 100μF 20% 6.3V X5R
,
CAP 0603 100pF 10% 50V X7R
,
RES, 0603 66.5k 1% 1/10W
RES, 0603 0Ω JUMPER
IC, LTM4602EV
CAP 1206 OPTION
,
CAP 1812 100μF 20% 6.3V X5R OPTION
,
CAP 1812 OPTION
,
CAP 0603 OPTION
,
CAP 0603 100pF 10% 50V NPO
,
CAP 0603 1μF 20% 10V X5R
,
CAP 0805 1μF 20% 16V X5R OPTION
,
DIODE, ZENER 4.7V
XSTR, SUD50N03-10CP MOSFET
RES, 0603 49.9k 1% 1/10W
RES, 0603 31.6k 1% 1/10W
RES, 0603 22.1k 1% 1/10W
RES, 0603 13.7k 1% 1/10W
RES, 0603 10k 5% 1/10W
RES, 0603 5.1k 5% 1/10W
RES, 0603 1M 5% 1/16W
RES, 2512 0.01Ω 5% 1W
RES, 0603 OPTION
RES, 0603 100k 1% 1/10W
MANUFACTURER/PART NUMBER
SANYO 35MV150WXV (Now SUNCON 35MV150WXV)
TAIYO YUDEN GMK316 BJ106ML-T
AVX 12066D266MAT2A
TDK C4532X5R0J107MZ
AVX 06035C101KAT1A
AAC CR16-6652FM
ACC CJ06-000M
LINEAR TECH. LTM4602EV
TAIYO YUDEN EMK316BJ475ML-T OPTION
TDK C4532X5R0J107MZ OPTION
TAIYO YUDEN JMK432BJ107MU-T OPTION
OPTION
AVX 06035A101KAT
TAIYO YUDEN LMK107BJ105MA-T
TAIYO YUDEN EMK212BJ105MG-T OPTION
DIODES INC. BZX84C4V7
SILICONIX SUD50N03-10CP
AAC CR16-4992FM
AAC CR16-3162FM
AAC CR16-2212FM
AAC CR16-1372FM
VISHAY CRCE060310K0JNEA
AAC CR16-512JM
AAC CR16-105JM
IRC LRF2512-01-R010-J
OPTION
AAC CR16-1003FM
Required Circuit Components
Additional Demo Board Circuit Components
dc1084a-af
4
DEMO MANUAL DC1084A-A
SCHEMATIC DIAGRAM
dc1084a-af
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.
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