Linear Technology’s LTM4644 step-down µModule regulator can be configured as a single- (16 A), dual- (12 A, 4 or 8 A, 8 A), triple- (8 A, 4 A, 4 A), or quad- (4 A each) output regulator. Power switches, dc-dc controllers, power switches, inductors, and compensation components all fit into 99- by 15- by 5.01-mm ball-grid-array package. It needs only eight external ceramic capacitors (1206 or smaller case sizes) and four feedback resistors (0603 case size) to regulate four independently adjustable output between 0.6 and 5.5 V. Thanks to separate input pins, four channels can be powered from different supply rails or a single rail from 4 to 14 V. The regulator delivers up to 13 A at 1.5 V from a 12-V input at an ambient temperature of 55°C, or up to 14 A with 200 LFM airflow. To minimize input ripple, the four channels operate at 90° out-of-phase whether at the 1-MHz default switching frequency or synchronized to an external clock between 700 kHz and 1.3 MHz. Regulation from an input supply voltage as low as 2.375 V is possible when adding an external bias supply above 4 V. Applications include communications, data storage, industrial, transportation, and medical systems.