Tiny Boost Regulator Eyes Optical Systems

Analog Devices has announced the Power by Linear LTM4661, a low power step-up µModule regulator in a 6.25 mm x 6.25 mm x 2.42 mm BGA package. Only a few capacitors and one resistor are required to complete the design, and the solution 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. The LTM4661 operates from a 1.8 V to 5.5 V input supply, and continues to operate down to 0.7 V after start-up. The output voltage can be set by a single resistor ranging from 2.5 V to 15 V. The combination of the small, thin package and wide input and output voltage range is ideal for wide range of applications including 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 4 A continuously under 3.3 VIN to 5 VOUT, and 0.7 A continuously under 3.3 VIN to 12 VOUT. The LTM4661 employs synchronous rectification, which delivers as high as 92% conversion efficiency (3.3 VIN to 5 VOUT). The switching frequency is 1 MHz, and can also be synchronized to an external clock ranging from 500 kHz to 1.5 MHz. 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 25 µA, 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 LTM4661 features an output disconnect during shutdown and inrush current limit at start-up. Fault protection features include short-circuit, overvoltage and overtemperature protection. It operates from –40℃ to 125℃ operating temperature. Available now, pricing for the LTM4661 starts at $6.98 (1,000s) for  6.25 mm x 6.25 mm x 2.42 mm BGA device.

Analog Devices | www.analog.com

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