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dc1472af
DEMO MANUAL DC1472A
DESCRIPTION
LTM4618EV:
6A Step-Down Power
µModule Regulator
Demonstration circuit 1472 features the LTM
®
4618EV
μModule
®
regulator, a complete high effi ciency synchro-
nous buck regulator. The DC1472 input range is from 4.5V
to 26.5V and is capable of delivering up to 6A of output
current. However, current derating may be necessary under
certain V
IN
, V
OUT
, frequency and thermal conditions. The
output voltage for the board is jumper programmable from
1.2V to 5V and can be set as low as 0.8V, the reference
voltage of the LTM4618EV.
Layout is simple, requiring only a few bulk input and output
capacitors externally. The TRACK/SS pin allows the user to
program the output voltage ramp-up and ramp-down, as
well as coincidentally or ratiometrically track an external
voltage. The LTM4618EV may be enabled or disabled by
the RUN pin. The MODE jumper (JP3) is available to select
L
, LT, LTC, LTM, μModule, Burst Mode, Linear Technology and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
BOARD PHOTO
from pulse-skipping or Burst Mode
®
operation for improved
effi ciency at light load. DC1472 has a default switching
frequency of 500 kHz and is synchronizable to an external
clock from 250 kHz up to 750 kHz. These features and the
availability of the LTM4618EV in a compact 9mm
×
15mm
×
4.32mm LGA package make the demonstration circuit
ideal for use in many high density point-of-load regula-
tion applications. The LTM4618 data sheet must be read
in conjunction with this demo manual for working on or
modifying the demo circuit 1472A.
Design fi les for this circuit board are available at
http://www.linear.com/demo
