Linear Technology DC2455A-C Manual

High Efficiency, PolyPhase 200A Step-Down
Description
Demonstration Circuit 2455A-C features PolyPhase
using the LTM 4650EY-1
®
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-C can deliver nominal 200A output current. As
explained in the data sheet, output current de-rating is
necessary for certain V , V
IN
LTM4650-1 on DC2455A-C 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
Figure 1. 4× LTM4650-1, 200A PolyPhase LTM4650-1/DC2455A-C Demo Board
design
®
(B-grade), the high efficiency,
, and thermal conditions. The
OUT
DEMO MANUAL DC2455A-C
Power µModule
4× LTM4650EY-1, 200A
TRACK pin. The output voltage is tightly regulated between
+ –
"V " and "V " through remote output voltage sensing
O O
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-C.
Design files for this circuit board are available at
http://www.linear.com/demo/DC2455A-C
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.
LTM4650EY-1
Regulator
®
dc2455acf
1