Linear DC1892A Demo Manual

DESCRIPTION
Demonstration circuit 1892A features the
the high efficiency, high density, dual 18A, 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. DC1892A can deliver up to 18A maximum
in each channel. As explained in the LTM4630 data sheet,
output current derating is necessary for certain V
and thermal conditions. The board operates in continuous
conduction mode in heavy load conditions. For high effi-
ciency 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 36A
output solution with optional jumper resistors. The board
BOARD PHOTO
DEMO MANUAL DC1892A
High Efficiency, Dual 18A
LTM 4630EV, allows the user to program 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 sens-
ing is available for improved output voltage regulation
at the load point. These features and the availability of
, V the LTM4630EV in a compact 16mm × 16mm × 4.41mm
IN OUT
LGA package make it ideal for use in many high density
point-of-load regulation applications. The LTM4630 data
sheet must be read in conjunction with this demo manual
for working on or modifying the demo circuit DC1892A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1892A
L, LT, LTC, LTM, Linear Technology, Linear logo, μModule and Burst Mode are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
Figure 1. DC1892A
LTM4630EV
Step-Down Power
µModule Regulator
®
dc1892afb
1