The Power by Linear LTM4661 is a low power step-up µModule regulator in a 6.25mm x 6.25mm x 2.42mm BGA package. Only a few capacitors and one resistor are required to complete the design, which occupies less than 1cm² single-sided or 0.5cm² on double-sided PCBs.
The LTM4661 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 is aimed at applications such as optical modules, battery-powered equipment, battery-based backup systems, bias voltage for power amps or laser diodes and small DC motors.
The LTM4661 can deliver 4A continuously under 3.3V IN to 5V OUT, and 0.7A continuously under 3.3V IN to 12V OUT. It uses synchronous rectification for 92% conversion efficiency from 3.3V IN to 5V OUT. The switching frequency is 1MHz, and can also be synchronized to an external clock ranging from 500kHz to 1.5MHz. This enables fast transient response to line and load changes and a significant reduction of output ripple voltage. 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.
The module features an output disconnect during shutdown and inrush current limit at start-up. Fault protection features include short-circuit, overvoltage and overtemperature protection and operates from –40℃ to 125℃. Pricing starts at $6.98 in volume.