Step-down regulator operates in noisy environments

The Power by Linear module can safely operate from unregulated or fluctuating 24 to 48V input supplies for operation in noisy environments. Integrated input and output filters enable it to meet the EN55022 Class B EMC standard for information technology equipment.

Additionally, the low EMI architecture makes it suitable for use in signal processing applications, including test and measurement, imaging and RF systems. The architecture is the same as in the LTM4651, 58Vin, 4.0A inverting µModule regulator; combining the two can generate a pair of positive and negative voltages in a system, says the company.

The output voltage is adjustable with one resistor from 0.5V to 94% of Vin. This wide output voltage range means the regulator is versatile enough to generate common system bus voltages of 3.3, 5.0, 12 and 24V. The peak efficiency at 24Vin to 5Vout is 92%. Output current of 4.0A up to 70°C ambient at 48Vinto 5.0Vout does not require a heat sink or airflow. Multiple devices can be paralleled for higher current applications. The switching frequency is adjustable by an external single resistor or can be synchronised to an external clock from 250kHz to 3MHz.

The LTM4653 houses a switching regulator controller, power switches, inductor and other supporting components in a 15 x 9.0 x 5.01mm BGA package. Bulk input and output filter capacitors complete the design.

Operating temperature is -40 to +125°C.