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dc2378abfa
DEMO MANUAL DC2378A-B
Description
LTM4650-1
High Efficiency, Single 50A or Dual 25A
Step-Down Power µModule Regulator
Demonstration circuit DC2378A-B features the
LTM
®
4650EY-1
, the high efficiency, high density, dual
25A, single 50A, switch mode step-down power module
regulator. The input voltage is from 4.5V to 15V. The output
voltage is programmable from 0.6V to 1.8V. DC2378A-B
can deliver 25A maximum current from each channel. As
explained in the data sheet, output current derating is nec-
essary for certain V
IN
, V
OUT
, and thermal conditions. The
board operates in continuous conduction mode in heavy
load conditions. For high efficiency at low load currents, the
MODE jumper (JP1) selects pulse-skipping mode for noise
sensitive applications or Burst Mode
®
operation in less
noise sensitive applications. Two outputs can be connected
in parallel for a single 50A output solution with optional
jumper resistors. The board allows the user to program
L
, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
how its output ramps up and down through the TRACK/
SS pin. The output can be set up to either coincidentally or
ratiometrically track with another supply’s output. Remote
output voltage sensing is available for improved output
voltage regulation at the load point. These features and
the availability of the LTM4650EY-1 in a compact 15mm
× 15mm × 5.01mm BGA package make it ideal for use in
many high density point-of-load regulation applications.
The LTM4650-1 data sheet must be read in conjunction
with this demo manual for working on or modifying the
demo circuit DC2378A-B.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2378A-B
Figure 1. LTM4650-1/DC2378A-B Demo Board
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