Linear Technology DC1668A-B, Demo Manual

1

dc1668abf

DEMO MANUAL DC1668A-B

DESCRIPTION

LTM4627EV High Efficiency 

40A PolyPhase Step-Down  

Power Supply 

BOARD PHOTO

Demonstration circuit 1668A-B is a PolyPhase

®

 power sup-

ply featuring three LTM

®

4627 high efficiency synchronous 

buck µModule

®

 regulators. The DC1668A-B 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 40A 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-B is set to 500kHz through the onboard 

LTC6902 clock generator. The external clock interleaves 

the paralleled phases to minimize input and output ripple. 
DC1668A-B 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.