Step-down regulator eases EMI/EMC problems

23rd March 2018

Mick Elliott

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Datasheet

The LTM8065 µModule step-down regulator with Silent Switcher architecture from Linear Technology, now a part of Analog Devices, is in stock at Mouser Electronics. The regulator offers an input voltage of up to 40V, which can safely operate from unregulated or fluctuating 12V to 36V input supplies in noisy environments such as industrial robotics, test and measurement, factory automation, medical, and avionics systems.

The Silent Switcher architecture minimises electromagnetic compatibility (EMC) and electromagnetic interference (EMI) emissions.

With these diminished emissions, the module can pass CISPR 22 class B for use in noise-sensitive signal processing applications, including imaging and RF systems.

And with the addition of two 0805-sized capacitors and two 0603-sized resistors, the LTM8065’s solution occupies approximately 100mm × 100mm, about half the size of equivalent power-level module solutions.

The regulator can deliver a continuous output current of 2.5A (3.5A peak) to a 5V load from a 12V input without a heat sink or airflow at an ambient temperature of up to 85 degrees Celsius.

The wide 0.97V – 18V output voltage range provides versatility, allowing engineers to use a single solution to generate common system bus voltages of 3.3V, 5V, 12V, and 15V.

The switching frequency is adjustable by an external single resistor, or engineers can synchronise it to an external clock from 200kHz to 3MHz.

The RoHS-compliant LTM8065 offers four modes: pulse-skipping mode, pulse-skip mode with spread spectrum modulation, external synchronisation mode, and Burst Mode operation, which features a quiescent current of 8 µA, making it ideal for battery-operated systems.