5A, 20 Vin step-down micromodule regulator minimises board space

December 18, 2014 // By Graham Prophet
LTM4625 is a 5A, 20 VIN step-down µModule (micromodule) regulator in a 6.25 x 6.25 x 5.01 mm BGA package which, with a few passive components, fits into 0.5cm² on a double-sided PCB.

Like other µModule regulators, the LTM4625 includes the DC/DC controller, power switches, inductor and compensation components in a single package. Two external ceramic capacitors (1206 case size) and a resistor (0603 case size) are required for operation. The LTM4625 operates from a 4V to 20V input supply, delivering a regulated output adjustable between 0.6V to 5.5V with ±1.5% accuracy over line, load and temperature.

LTM4625 operates at a user-adjustable switching frequency from 800 kHz to 4 MHz or can be synchronised to an external clock from 700 kHz to over 1.3 MHz. The module also provides a clock-out signal at the same frequency with selectable phase shift (90°, 120° or 180°), for current sharing multiple LTM4625 modules for higher output current. With the addition of an external bias supply above 4V, the LTM4625 can operate from an input voltage as low as 2.375V. Output overvoltage, overcurrent and overtemperature fault protection are included in the regulator.

The LTM4625 is available with guaranteed operation over the -40°C to 125°C internal temperature range and costs $6.45 (1000)

Linear Technology; www.linear.com/product/LTM4625