LTM8073 silent switcher uModule regulator CISPR 22 Class B-compliant

Analog Devices, which recently acquired Linear Technology, has developed the LTM8073, a uModule (power module) step-down regulator with up to 60V input voltage range (65V maximum).

The regulator can safely operate from unregulated or fluctuating 24 to 48V input supplies in noisy environments such as communication infrastructure, factory automation, industrial robotics and avionics systems. The Silent Switcher architecture minimises EMC/EMI emissions, says Analog Devices, enabling the LTM8073 to pass CISPR 22 Class B for use in signal processing applications, including imaging and RF systems.

The output voltage is adjustable with one resistor from 0.8 to 15V. This wide output range allows for versatility, as one product can be used to generate common system bus voltages of 3.3, 5.0, 12 and 15V. The efficiency at 24VIN to 5.0VOUT at 3A is 90 per cent. The LTM8073 delivers 3A of output current up to 85 degree C ambient without a heat sink or airflow. The LTM8073 has a Share pin for current sharing, so it can operate in parallel, to deliver more current.

The LTM8073 houses a switching regulator controller, power switches, inductor and other supporting components in a 6.25 x 9.0 x 3.32mm BGA package. Only the bulk input and output capacitors and a few small resistors are required to complete the design.

The switching frequency is adjustable by an external single resistor or can be synchronised to an external clock from 200kHz to 3.0MHz. The LTM8073 has four operating modes, which are Burst Mode operation, pulse-skipping mode, pulse-skipping mode with spread spectrum and external sync mode.

The LTM8073 operating temperature range is –40 to +125 degree C.

On March 10 2017, Analog Devices acquired Linear Technology, creating a global, high-performance analog company, specialising in technologies that sense, measure, power, connect and interpret engineering challenges.


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