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dc2268abfa
DEMO MANUAL DC2268A-B
Description
LTM4620A
Dual 13A or Single 26A
μModule Regulator
Demonstration circuit 2268A-B is a high efficiency, high
density, dual 13A, switch mode step-down power supply
on a compact 1.5' × 1.2' PCB. It features the
LTM4620A
μModule regulator. The input voltage is from 5.5V to
16V. The output voltage is programmable from 0.6V to
5V. DC2268A-B can deliver up to 13A 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 conduction
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 outputs can
be connected in parallel for a single 26A output solution
with optional jumper resistors. The board allows the user
to program how its output ramps up and down through
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.
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 LTM4620A in a
compact 16mm × 16mm × 5.01mm BGA package make
it ideal for use in many high-density point-of-load regula-
tion applications. The LTM4620A data sheet must be read
in conjunction with this demo manual for working on or
modifying the demo circuit DC2268A-B.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2268A-B
BoarD photo
Figure 1. LTM4620A/DC2268A-B Demo Board
