1
dc2455aaf
DEMO MANUAL DC2455A-A
Description
LTM4650EY-1
High Efficiency, PolyPhase 100A Step-Down
Power µModule
®
Regulator
2× LTM4650EY-1, 100A
Demonstration Circuit 2455A-A features PolyPhase
®
design
using the
LTM
®
4650EY-1
(B-grade), the high efficiency,
high density, dual 25A, switch mode step-down power
module regulator. The input voltage is from 4.5V to 15V.
The output voltage is jumper selectable from 0.9V to 1.8V.
DC2455A-A can deliver nominal 100A output current. As
explained in the data sheet, output current de-rating is
necessary for certain V
IN
, V
OUT
, and thermal conditions. The
LTM4650-1 on DC2455A-A always operate in continuous
conduction mode. The switching frequency can be pro-
grammed 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
L
, LT, LTC, LTM, Linear Technology, the Linear logo, µModule, PolyPhase and TimerBlox are
registered trademarks of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
TRACK pin. The output voltage is tightly regulated between
“V
O
+
” and “V
O
–
” through remote output voltage sensing
which improves output voltage regulation at heavy loads.
These features and the availability of the LTM4650EY-1
in a compact 16mm × 16mm × 5.01mm BGA package
make it ideal for use in many high-density point-of-load
regulation applications. The LTM4650-1 data sheet must
be read in conjunction with this demo manual for working
on or modifying the demo circuit DC2455A-A.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2455A-A
Figure 1. 2× LTM4650-1, 100A PolyPhase LTM4650-1/DC2455A-A Demo Board
