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dc2268acf
DEMO MANUAL
DC2268A-C
Description
LTM4628
Dual 8A or Single 16A
μModule Regulator
Demonstration circuit 2268A-C 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 5.5V to
16V. The output voltage is programmable from 0.6V to
5.5V. DC2268A-C can deliver up to 8A 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
®
operation in less noise sensitive applica-
tions. Two outputs can be connected in parallel for a single
16A output solution with optional jumper resistors. The
board allows the user to program how its output ramps
L
, LT, LTC, LTM, Linear Technology, Burst Mode, µModule and the Linear logo are registered
trademarks of Analog Devices, Inc. All other trademarks are the property of their respective
owners.
BoarD photo
up and down through the TRACK/SS pin. Remote output
voltage sensing 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 LTM4628 in a compact 15mm x 15mm x 4.41mm
LGA package make it ideal for use in many high-density
point-of-load regulation applications. The LTM4628 data
sheet must be read in conjunction with this demo manual
for working on or modifying the demo circuit DC2268A-C.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2268A-C
Figure 1. LTM4628/DC2268A-C Demo Board
