1
dc2268aif
DEMO MANUAL DC2268A-I
DESCRIPTION
LTM4650A-1
Dual 25A or Single 50A
μModule Regulator
Demonstration circuit 2268A-I is a high efficiency, high
density, dual 8A, switch mode step-down power supply on
a compact 1.5' × 1.2' PCB. It features the
μModule
®
regulator. The input voltage is from 4.5V to
16V. The output voltage is programmable from 0.6V to
5.3V. DC2268A-I can deliver up to 25A maximum in each
channel. As explained in the data sheet, output current
derating is necessary for certain V
IN
, V
OUT
, and thermal
conditions. The board operates in continuous conduc-
tion mode in heavy load conditions. For high efficiency
at low load currents, the resistor jumper (R1/R2) selects
pulse-skipping mode for noise sensitive applications or
Burst-Mode
®
in less noise sensitive applications. Two out-
puts can be connected in parallel for a single 50A output
solution with optional jumper resistors. The board allows
the user to program how its output ramps up and down
L
, LT, LTC, LTM, Linear Technology, the Linear logo, µModule and Burst Mode are registered
trademarks of Analog Devices, Inc. All other trademarks are the property of their respective
owners.
BOARD PHOTO
through the TRACK/SS pin. Remote output voltage sens-
ing is available for improved output voltage regulation
at the load point. An optional input inductor L1 reduces
the EMI noise for noise sensitive applications. DC2268A
can be easily inserted to an edge connector for testing
and debugging. These features and the availability of the
LTM4650A-1 in a compact 16mm × 16mm × 4.41mm
LGA package make it ideal for use in many high-density
point-of-load regulation applications. The LTM4650A-1
data sheet must be read in conjunction with this demo
manual for working on or modifying the DC2268A-I.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2268A-I
Figure 1. LTM4650A-1/DC2268A-I Demo Board
