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Regulator achieves 88% operating efficiency

Posted: 17 Oct 2011 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC converter? step-down regulator? power supply?

Linear Technology Corp. has launched a 36V input constant frequency step-down ?Module regulator with an adjustable output current limit of up to 5A. The LTM8052 converts an input voltage between 6V to 36V to an adjustable output voltage between 1.2V to 24V. The company said that in a 12V input to 2.5V output application, the device reaches a peak operating efficiency of 88 percent at 2A.

The flexible current limit helps system designers set the maximum power delivered to a load. This minimizes the output rating of the upstream AC/DC or DC/DC power supply. The LTM8052 is also capable of sourcing or sinking current while regulating an adjustable output voltage. For simple noise filtering, the regulator works at a constant frequency throughout the entire output current range. Applications include industrial, medical imaging and communications point of load, charge balancing and Peltier thermoelectric module drivers.


36VIN, 5A Source/Sink Step-Down?Module Regulator with Adjustable Current Limit

The LTM8052's 10 percent accurate current limit is an improvement over traditional step-down regulators whose current limit can be 40 to 50 percent greater than the actual output current, said Linear Tech. With the device, a lower power and less costly upstream supply can be installed. Otherwise, a greater output power rating to prevent a collapse of the voltage rail under an overcurrent or short-circuit condition is required.

The current limit may be compensated for temperature using a thermistor for improved thermal management. When sinking current, the ?Module regulator recovers energy, transferring it to the input rail rather than dissipating it as heat in conventional methods. For noise-sensitive applications, the LTM8052 can be synchronized to an external clock frequency in the range of 100kHz to 1MHz. Additional features include externally adjustable soft start and switching frequency, and thermal shutdown.

The LTM8052 comes in a thermally efficient 11.25x15x2.82mm LGA package. The two temperature grades, E and I for the -40C to 125C range, are available for immediate delivery. Pricing starts at $13.17 each for 1,000-piece quantities.

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