µModule regulator delivers 95% efficiency at full current

16th December 2015
Nat Bowers

Linear Technology announces the LTM4648, a 2.375 to 5.5VIN, 10A step-down µModule regulator in a 9x15x4.92mm BGA package with high operating efficiency and low temperature rise. With an integrated 5V boost converter to drive the gates of its N-channel MOSFETs from low VIN supplies, the LTM4648 improves efficiency and simplifies system design by eliminating the need for 5 or 12V power rails and dependency on auxiliary regulators.

At full power (10A, full range of VOUT and VIN) is delivered when operating from 0 to +85°C ambient temperature, while the LTM4648 requires no heat sink or airflow nor is its output current derated. Half-power occurs at high ambient temperature of +110°C (TJMAX = +125°C). The µModule regulator operates at up to 91% efficiency (3.3 or 5VIN, 1.5VOUT at 10A). 95% efficiency is achieved when converting 3.3VIN to 2.5VOUT at 10A.

The LTM4648 regulates output voltages adjustable from 0.6 to 5V. Equipped with a differential remote sense amplifier to compensate for voltage droop due to circuit board trace impedance, the LTM4648 regulates a load voltage with ±1.5% accuracy over line, load and temperature (-40 to +125°C). Target applications include PoL conversion from a 3.3V main power bus and battery-powered systems in telecomms, medical, industrial, avionics and portable test equipment.

The LTM4648 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.

The LTM4648 is synchronisable to an external clock ranging in frequency from 400 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 personalise a circuit’s performance. The LTM4648 permits output voltage tracking for sequencing multiple rails in a system. To protect the load, the LTM4648 features output overvoltage and overcurrent protection.

The LTM4648 E and I grades are guaranteed for internal operation from -40 to +125°C. Pricing starts at $13.25 each in 1,000 unit quantities.

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