New step-down regulator delivers full current with 86% efficiency

Linear Technology has launched the LTM4649, a 10A step-down µModule regulator with high operating efficiency and low temperature rise in a 9mm x 15mm x 4.92mm BGA (ball grid array) package. The device requires no heat sink, airflow or output current derating at full power from 0°C to 83°C ambient temperature, while operating up to 86% efficiency (5VIN –12VIN, 1.5VOUT at 10A). Output current is reduced only by 4A up to 100ºC ambient and by 2A with 400LFM.

The LTM4649 converts input supplies ranging from 4.5V to 16V to lower output voltages ranging from 0.6V to 3.3V. Equipped with a differential remote sense amplifier to compensate for voltage droop due to circuit board trace impedance, the LTM4649 regulates a load voltage with ±1.5% accuracy over line, load and temperature (-40°C to 125°C).

The LTM4649 provides input and output clocks for multiphase operation among multiple devices to accurately current share for up to 40A load. Multiphase operation reduces input and output ripple as well as the number of input and output capacitors. Applications include point-of-load conversion from 12V or 5V inputs in telecom, industrial, avionics and test equipment.

The device is synchronizable to an external clock ranging in frequency from 400kHz to 750kHz. With options for Burst Mode® operation for the highest conversion efficiency at light load and pulse-skipping operation for lower output voltage ripple, gives users the option to personalize a circuit’s performance. The LTM4649 permits output voltage tracking for sequencing multiple rails in a system. To protect the load, the LTM4649 features output overvoltage and overcurrent protection.

The LTM4649 E and I grades are guaranteed for internal operation from -40°C to 125°C.


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