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3.3-A, 2.5-MHz, 42-V DC/DC converter offers integrated fault protection

April 08, 2010 | Paul Buckley | 222900794
3.3-A, 2.5-MHz, 42-V DC/DC converter offers integrated fault protection Linear Technology Corporation has introduced a current mode, fixed frequency step-up DC/DC converter with integrated fault protection features for output shorts, input/output overvoltages, and overtemperature conditions.

The LT3581 uses two integrated 42 V switches - a 1.9 A master switch and a 1.4 A slave switch - which can be tied together for a total limit of 3.3 A. The LT3581 operates from an input voltage range of 2.5 V to 22 V, with transient protection to 40V, making it suitable for applications with input sources ranging from a single-cell Li-Ion to automotive inputs. The LT3581 is ideal for many local power supply designs as it can be configured as either a boost, SEPIC or an inverting converter. The combination of a 4 mm x 3 mm DFN package (or MSOP-16E) and tiny externals ensures a very compact footprint while minimizing solution cost.

The LT3581's low VCESAT switches, 0.25 V (tied together at 2.75 A), deliver efficiencies up to 88 percent. With both switches combined and from a 5 V input, the LT3581 can deliver up to 830 mA at 12 V or 625 mA at -12 V. For high voltage outputs, the LT3581's slave switch enables high power charge pump topologies which are very efficient and require few external components. The LT3581's switching frequency can be programmed via a single resistor or synchronized to an external clock between 200 kHz and 2.5 MHz, minimizing external component sizes and avoiding “noise critical” frequency bands. Undervoltage lockout (UVLO) is user adjustable for optimal system performance. A single feedback resistor sets the output voltage, minimizing external components. Other features include external synchronization capability and junction temperature monitoring.

Availability and Pricing

The LT3581EDE is available in a 4 mm x 3 mm DFN-14 package, priced starting at 2.45 US Dollars each for 1,000 piece quantities. The LT3581EMSE is also available in a thermally enhanced MSOP-16 package, priced starting at $2.55 each for 1,000 piece quantities. Industrial temperature (-40 to 125 degrees C) versions, the LT3581IDE and the LT3581IMSE, are also available from stock. Pricing starts at 2.72 US Dollars and 2.83 US Dollars each, respectively, for 1,000 piece quantities.

Datasheet: LT3581

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