The LTM4644 quad output step-down µModule® (micromodule) regulator from Linear Technology is configurable as a single (16 A), dual (12 A, 4 A or 8 A, 8 A), triple (8 A, 4 A, 4 A) or quad (4 A each) output regulator. This flexibility enables system designers to rely on one simple and compact µModule regulator for the variety of voltage and load current requirements of FPGAs, ASICs and microprocessors as well as other board circuitry. The LTM4644 regulator includes the DC/DC controllers, power switches, inductors and compensation components in a 9 x 15 x 5.01 mm BGA package. Only eight external ceramic capacitors (1206 or smaller case sizes) and four feedback resistors (0603 case size) are required to regulate four independently adjustable outputs between 0.6 V to 5.5 V. Separate input pins enable the four channels to be powered from different or a common supply rail(s) from 4 V to 14 V. The LTM4644 is ideal for applications in communications, data storage, industrial, transportation and medical systems. At an ambient temperature of 55 °C, the LTM4644 delivers up to 13 A at 1.5 V from a 12 V input or up to 14 A with 200 LFM airflow. The four channels operate at 90° out-of-phase to minimize input ripple whether at the 1 MHz default switching frequency or synchronized to an external clock between 700 kHz and 1.3 MHz. With the addition of an external bias supply above 4 V, the LTM4644 can regulate from an input supply voltage as low as 2.375 V. Output overvoltage and overcurrent fault protection are included in the regulator.
The LTM4644 is available with operation specified over the -40 °C to +125 °C internal temperature range. The µModule regulator is available for immediate delivery from stock with pricing starting at $22.85 each for 1,000-piece quantities.