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dc1668acf
DEMO MANUAL DC1668A-C
DESCRIPTION
LTM4627EV High Efficiency
50A PolyPhase Step-Down
Power Supply
BOARD PHOTO
Demonstration circuit 1668A-C is a PolyPhase
®
power
supply featuring four LTM
®
4627 high efficiency synchro-
nous buck µModule
®
regulators. The DC1668A-C input
voltage range is between 4.5V to 20V with a jumper pro-
grammable output voltage from 0.6V to 3.3V. The demo
circuit can deliver up to 50A of load with excellent current
sharing. Current derating may be necessary under certain
operating conditions.
The LTM4627 can be synchronized to an external clock be-
tween 250kHz to 770kHz. The default switching frequency
for the DC1668A-C is set to 500kHz through the onboard
LTC6902 clock generator. The external clock interleaves
the paralleled phases to minimize input and output ripple.
DC1668A-C 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.
