Typical Application for LTM4643IY 4V to 20V Input, 4-Phase, 1.2V at 12A Step-Down Regulator with Temperature Monitoring. The LTM4643 is a quad DC/DC step-down regulator with 3A per output. Outputs can be paralleled in an array for up to 12A capability. Included in the package are the switching controllers, power FETs, inductors and support components