Linear Technology DC1668A-A Demo Manual

DESCRIPTION
Demonstration circuit 1668A-A is a PolyPhase
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
BOARD PHOTO
DEMO MANUAL DC1668A-A
LTM4627EV High Efficiency
30A PolyPhase Step-Down
power sup-
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
http://www.linear.com/demo
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.
Power Supply
dc1668aaf
1