Tiny µmodule boost regulator for low voltage optical systems

Analog Devices has announced the Power by Linear LTM4661, a low power step-up µModule regulator that comes in a 6.25mm x 6.25mm x 2.42mm BGA package.

Needing only a few capacitors and one resistor to complete the design, the solution occupies less than 1cm² single-sided or 0.5cm² on double-sided PCBs.

The device incorporates a switching DC/DC controller, MOSFETs, inductors and supporting components and operates from a 1.8V to 5.5V input supply, and continues to operate down to 0.7V after start-up. The output voltage can be set by a single resistor ranging from 2.5V to 15V.

The combination of the small, thin package and wide input and output voltage range makes this suitable for a wide range of applications including optical modules, battery-powered equipment and battery-based backup systems,

The LTM4661 can deliver 4A continuously under 3.3VIN to 5VOUT, and 0.7A continuously under 3.3VIN to 12VOUT. It employs synchronous rectification, which delivers as high as 92% conversion efficiency (3.3VIN to 5VOUT). The switching frequency is 1MHz, and can also be synchronised to an external clock ranging from 500kHz to 1.5MHz.

The LTM4661 1MHz switching frequency and dual phase single output architecture enable fast transient response to line and load changes and a significant reduction of output ripple voltage.

The LTM4661 has three operation modes: Burst Mode operation, forced continuous mode and external sync mode. The quiescent current in Burst Mode operation is only 25µA, which provides extended battery run time. For applications demanding the lowest possible noise operation, the forced continuous mode or external sync mode minimize possible interference of switching noise.

It also features an output disconnect during shutdown and inrush current limit at start-up. Fault protection features include short-circuit, overvoltage and overtemperature protection. The LTM4661 operates from –40℃ to 125℃ operating temperature.

Author
Neil Tyler