Description
DEMO MANUAL DC2453A
LTM4643EV
Quad DC/DC µModule Regulator
with Configurable 3A Output Array
Demonstration circuit 2453A features the LTM®4643
®
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
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DEMO MANUAL DC2453A
performance summary
PARAMETER CONDITIONS/NOTES VALUE
Input Voltage Range 4V – 20V
Output Voltage V
Maximum Continuous Output Current per Phase Derating is Necessary for Certain Operating
Default Operating Frequency 1.2MHz
Efficiency V
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:
JP1 JP2 JP3 JP2
RUN1 RUN2 RUN3 RUN4
ON ON ON ON
JP8 JP7 JP6 JP5
MODE1 MODE2 MODE3 MODE4
CCM CCM CCM CCM
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
Quick start proceDure
DEMO MANUAL DC2453A
Figure 2. Test Setup of DC2453A
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