Boost Regulator Basks In Low-Voltage Optical Systems

Analog Devices’ Power by Linear LTM4661 step-up µModule regulator in a 6.25mm x 6.25mm x 2.42mm BGA package targets low-voltage optical systems. A few capacitors and one resistor are required to complete the design, and the solution occupies less than 1-cm² single-sided or 0.5-cm² on double-sided PCBs. The LTM4661 incorporates a switching dc/dc controller, MOSFETs, inductors and supporting components. It 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 ideal for a 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 features an output disconnect during shutdown and inrush current limit at start-up. Fault protection features include short-circuit, overvoltage and overtemperature protection, and an operating temperature from –40 to +125 operating temperature. For more information, check out a datasheet and more LTM4661 resources .

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