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dc1780abfa
DEMO MANUAL DC1780A-B
DESCRIPTION
LTM4620EV: High Efficiency,
PolyPhase 75A Step-Down
Power µModule
®
Regulator
Demonstration circuit 1780A-B features PolyPhase
®
design using the LTM
®
4620EV, the high efficiency, high
density, dual 13A, switch mode step-down power module
regulator. The input voltage is from 4.5V to 16V. The
output voltage is jumper selectable from 1.0V to 2.5V.
DC1780A-B can deliver nominal 75A output current with
3× LTM4620s in parallel. As explained in the data sheet,
output current derating is necessary for certain V
IN
, V
OUT
,
and thermal conditions. The LTM4620 on DC1780A-B
always operates in continuous conduction mode. The
switching frequency can be programmed through a resistor
or can be synchronized to an external clock signal. The
board allows the user to program how its output voltage
ramps up and down through the TRACK_CONTROL pin.
The output voltage is tightly regulated between V
OUT
+
and V
OUT
–
through remote output voltage sensing which
improves output voltage regulation at heavy loads. These
features and the availability of the LTM4620EV in a compact
15mm × 15mm × 4.41mm LGA package make it ideal for
use in many high density point-of-load regulation applica-
tions. The LTM4620 data sheet must be read in conjunction
with this demo manual prior to working on or modifying
the demo circuit DC1780A-B.
Design files for this circuit board are available at
http://www.linear.com/demo
L
, LT, LTC, LTM, Linear Technology, the Linear logo, μModule and PolyPhase are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
Figure 1. 75A PolyPhase LTM4620/DC1780A-B Demo Board
BOARD PHOTO
