Dual 3-A, 2.5-MHz, 42-V boost/inverting DC/DC converter features integrated fault protection

January 26, 2012 // By Paul Buckley
Linear Technology Corporation has introduced a dual independent channel, step-up DC/DC converter with integrated fault protection features for output shorts, input/output overvoltages, and overtemperature conditions. Each channel of the LT8582 uses two integrated 42 V switches: a 1.7 A master switch and a 1.3 A slave switch that can be tied together for a total current limit of 3 A.

The LT8582 operates from an input voltage range of 2.5 V to 22 V with transient protection to 40 V, making it suitable for applications with input sources ranging from a single-cell Li-Ion to automotive inputs. The LT8582 is ideal for many local power supply designs as each channel can be independently configured as either a boost, SEPIC, inverting or flyback converter. The combination of a 4 mm x 7 mm DFN package and tiny externals ensures a very compact footprint while minimizing solution cost.     

The LT8582's low V CESAT switches, 0.27V (tied together at 2.75 A) can deliver efficiencies up to 90%. A power good pin is offered for ease of use when event-based sequencing is required. For high voltage outputs, the LT8582's slave switch enables high power charge pump topologies which are very efficient and require few external components.

The LT8582'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. Each channel requires a single feedback resistor to set the output voltage, minimizing external components. Other features include external synchronization capability, output short circuit protection and frequency foldback.     

Availability and Pricing      

The LT8582EDKD is available in a 7mm x 4mm DFN-24 package and is priced at $3.75 each for 1,000 piece quantities. An industrial temperature (-40°C to 125°C) version, the LT8582IDKD, is priced at $4.13 each for 1,000 piece quantities. Both versions are available from stock.      

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