The 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 to 14V.
At an ambient temperature of 55°C, the LTM4644 delivers up to 13A at 1.5V from a 12V input or up to 14A with 200LFM airflow. The four channels operate at 90° out-of-phase to minimise input ripple whether at the 1 MHz default switching frequency or synchronised to an external clock between 700 kHz and 1.3 MHz. With the addition of an external bias supply above 4V, the LTM4644 can regulate from an input supply voltage as low as 2.375V. Output overvoltage and overcurrent fault protection are included in the regulator. Operation is over -40°C to +125°C internal temperature range and the µModule costs $22.85 (1000).
Linear Technology; www.linear.com/product/LTM4644