Integrated buck regulator delivers 10A with 86% efficiency

June 28, 2013 // By Paul Buckley
Linear Technology Corporation has introduced a 10 A step-down micro-module regulator with high operating efficiency and low temperature rise in a 9 x 15 x 4.92 mm BGA package.

The LTM4649 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 (5 VIN –12 VIN, 1.5 VOUT at 10 A). Output current is reduced by 4A up to 100ºC ambient and by 2A with 400LFM. The LTM4649 converts input supplies ranging from 4.5 V to 16 V to lower output voltages ranging from 0.6 V to 3.3 V. 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 40 A 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 12 V or 5 V inputs in telecom, industrial, avionics and test equipment.
The LTM4649 is synchronisable to an external clock ranging in frequency from 400 kHz to 750 kHz. 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 personalise 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 operation from -40°C to 125°C and cost $16.75 (1,000)
Linear Technology,