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dc1668aaf
DEMO MANUAL DC1668A-A
DESCRIPTION
LTM4627EV High Efficiency
30A PolyPhase Step-Down
Power Supply
BOARD PHOTO
Demonstration circuit 1668A-A is a PolyPhase
®
power sup-
ply featuring two LTM
®
4627 high efficiency synchronous
buck µModule
®
regulators. The DC1668A-A input voltage
range is between 4.5V to 20V with a jumper programmable
output voltage from 0.6V to 3.3V. The demo circuit can
deliver up to 30A of load with excellent current sharing.
Current derating may be necessary under certain operat-
ing conditions.
The LTM4627 can be synchronized to an external clock be-
tween 250kHz to 770kHz. The default switching frequency
for the DC1668A-A is set to 500kHz through the onboard
LTC6902 clock generator. The external clock interleaves
the paralleled phases to minimize input and output ripple.
DC1668A-A demonstrates that paralleling LTM4627 mod-
ules is easy and reliable. These features and the availability
of the LTM4627 in a compact thermally enhanced 15mm ×
15mm × 4.32mm LGA package make the circuit ideal for
use in high density point of load regulation applications.
Design files for this circuit board are available at
L
, LT, LTC, LTM, Linear Technology, PolyPhase, µModule and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
