DEMO MANUAL DC2081A-A
LTM4630EV
High Efficiency Dual 18A or
Single 36A
μModule
Regulator
DESCRIPTION
Demonstration circuit 2081A-A features the
LTM
®
4630EV,
the high efficiency, high density, dual 18A, switch mode
step-down μModule
®
regulator. The input voltage is from
4.5V to 15V. The output voltage is programmable from
0.6V to 1.8V. DC2081A-A is configured as dual-phase,
single-output, which can deliver up to 36A maximum.
The board designs with minimum components to dem-
onstrate this high efficiency, high density μModule. As
explained in the data sheet, output current de-rating is
necessary for certain V
IN
, V
OUT
, and thermal conditions.
These features and the availability of the LTM4630EV
in a compact 16mm × 16mm × 4.41mm LGA package
make it ideal for use in many high-density point-of-load
applications. The LTM4630 data sheet must be read in
conjunction with this demo manual for working on or
modifying the demo circuit DC2081A-A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2081A-A
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.
PERFORMANCE SUMMARY
PARAMETER
Input Voltage Range
Output Voltage V
OUT
Maximum Continuous Output Current
Default Operating Frequency
Efficiency
Load Transient
CONDITIONS
Specifications are at T
A
= 25°C
VALUE
4.5V ~ 15V
1.0V ± 1.5% (0.985V ~ 1.015V)
36A
400kHz
V
IN
= 4.5 ~ 15V, I
OUT
= 0 ~ 36A
De-rating is Necessary for Certain V
IN
, V
OUT
and
Thermal Conditions, See Data Sheet for Detail
V
IN
= 5V, V
OUT
= 1.0V, I
OUT
= 36A, f
SW
= 400kHz
V
IN
= 12V, V
OUT
= 1.0V, I
STEP
= 0 ~ 9A
85.7%, See Figure 2
< 62.5mV
P-P
, See Figure 3
dc2081a-af
1
DEMO MANUAL DC2081A-A
DC2081A-A BOARD PHOTO
QUICK START PROCEDURE
Demonstration circuit DC2081A-A is easy to set up to
evaluate the performance of the LTM4630EV. Please refer
to Figure 1 for proper measurement setup and follow the
procedure below:
1. With power off, connect the input power supply, load
and meters as shown in Figure 1. Preset the load to 0A
and V
IN
supply to 12V.
2. Turn on the power supply at the input. The output volt-
age should be 1.0V ± 1.5% (0.985V ~ 1.015V).
3. Once the proper output voltage is established, adjust the
load within the operating range and observe the output
voltage regulation, output voltage ripple, efficiency and
other parameters. Output ripple can be measured at J6
with BNC cables.
4. (Optional) For optional load transient test, apply an ad-
justable pulse signal between “IOSTEP CLK” and “GND”
test point. Pulse amplitude (3V ~ 3.5V) sets the load
step current amplitude. The output transient current can
be monitored at the BNC connector J5 (15mV/A). The
pulse signal should have very small duty cycle (< 10%)
to limit the thermal stress on the transient load circuit.
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dc2081a-af
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